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Tytuł:
Analysis of suspended solids emissions from a combined sewage system using the Stormwater Management Model (SWMM)
Autorzy:
Sakson, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/27310136.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
sewerage
modelling
SWMM
suspended solids
pollutant emission
water protection
Opis:
The protection of water bodies requires the reduction of pollutant emissions from all major sources. In urbanized areas, these include: wastewater treatment plants (WWTPs) and (depending on the type of sewage system) combined sewer overflows (CSOs) and stormwater drainage outlets. WWTPs are usually monitored and emitted pollutant loads are known, but it is more difficult to assess the pollutant load discharged by CSOs and stormwater drainage systems. The article attempts to use the Stormwater Management Model (SWMM) to assess emissions of suspended solids from a large urban combined catchment. Suspended solids are the main pollutant of stormwater runoff in urban areas, and the dynamics of their emission from catchments is very diverse. The amount of suspended solids discharged by CSOs functioning in the given city was assessed in comparison with emissions from a wastewater treatment plant. The results show that CSOs discharge a pollutant load to the receiver which is comparable to WWTPs, but in a much shorter time and in a violent manner which can lead to the severe deterioration of receiving water quality. The modelling took into account the quality of dry weather sewage, the build-up of suspended solids, wash-off processes in the catchment area, and local precipitation characteristics. Factors affecting the quality of the obtained model and the accuracy of the emission level assessment were analysed.
Źródło:
Geology, Geophysics and Environment; 2023, 49, 4; 389--399
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental Study of Produced Water Treatment Using Activated Carbon with Aluminum Oxide Nanoparticles, Nanofiltration and Reverse Osmosis Membranes
Autorzy:
Hussein, Mudhaffar Yacoub
Al-Naemi, Amer Naji Ahmed
AlJaberi, Forat Yasir
Powiązania:
https://bibliotekanauki.pl/articles/24201776.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
produced water
wastewater treatment
nanofiltration membrane
reverse osmosis membrane
TOC removal
total organic compound
TDS removal
total dissolved solids
reuse
Opis:
This work inspected the produced water discharged from the Amara oil field in (Misan-Iraq) to improve the quality of water before reuse and reinjection or disposal. The process of treatment included a pretreatment step using activated carbon and post-treatment using flat polymeric nanofiltration membrane (NF) (1.0 nm) and reverse osmosis membrane (RO) (0.3 nm), respectively. Therefore, activated carbon without aluminum oxide (Al2O3) nanoparticles and with (Al2O3) nanoparticles (20 nm) was used to examine the removal efficiency of the total organic compound (TOC). The height of the fixed bed of activated carbon and its diameter were 35 cm and 2.5 cm, respectively. The volumetric flow rates of the produced water flowing through the activated carbon column were taken as (25, 20, 15, 10 and 5)×10-4 m3/h respectively, at transmembrane pressure (TMP) of 1.0 bar, pH equals 6, and the temperature of 25 °C. The TOC removal efficiencies attained using activated carbon without Al2O3 nanoparticles were (52, 64, 77, 83 and 87%), respectively, and (65, 72.7, 83.4, 92.5 and 95.2%) with the use of Al2O3 nanoparticles, respectively. Produced water effluent from the activated carbon column was treated by flat NF and RO membranes to reduce the total dissolved solids (TDS). The cross-flow rates through NF and RO membranes were 0.1 and 0.25 m3/h, TMP (1–12 bar) and 60 bar, respectively. The removal efficiency of TDS was enhanced up to 40% and 99.67%, respectively. In addition, the TOC removal efficiency was 100% in the effluent of the RO membrane.
Źródło:
Journal of Ecological Engineering; 2023, 24, 5; 78--87
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Handling and transportation properties of rapeseed biomass as affected by particle size
Autorzy:
Bojanowska, Milena
Powiązania:
https://bibliotekanauki.pl/articles/29521042.pdf
Data publikacji:
2023
Wydawca:
Akademia Morska w Szczecinie. Wydawnictwo AMSz
Tematy:
rapeseed meal
rapeseed cake
canola
biomass
agricultural commodities
bulk storage
flowability
logistics vulnerability
particle size
angle of repose
porosity
bulk density
agricultural bulk solids
Opis:
Rapeseed by-products of seeds de-oiling, particularly expellers and post-extracted meal, are currently considered an important biomass that can be used as an alternative energy source, either in raw form or after conversion to biochar. Rapeseed biomass represents a difficult-to-handle cargo, mainly due to its sensitivity to mechanical, climatic, and biological impacts, as well as its dusty nature. This study aims to determine the physical properties of rapeseed meals and their fractions. Morphological and chemical features of six particle sets are investigated in order to explain the variation in their physical properties having importance in handling and transportation processes. The true density of fractions increases when the particle size decreases due to the diminishing quantitative share of seed coats. No correlation is observed between true and bulk densities, as the particle shape, surface sculpture, and adhesion affect the mutual particle arrangements. Along with a decrease in the particle size from 0.4 mm, a rapid decrease in the flowability is observed. The tendency of the finest dust (d < 0.075 mm) to form agglomerated complexes causes its lower bulk density, higher porosity, and higher angles of repose in comparison to coarse dust (0.075–0.4 mm). It is concluded that a relatively low tendency to free flowing of natural RSM is mainly caused by its wide-ranging particle size distribution and their geometry differentiation, which facilitate mutual particle interlockings. The known cases of blockages of silos, bins, hoppers, and transfer chutes may be mainly caused by the powder fractions (< 0.2 mm), with a much lower flowability than other particles.
Źródło:
Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2023, 74 (146); 5-15
1733-8670
2392-0378
Pojawia się w:
Zeszyty Naukowe Akademii Morskiej w Szczecinie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the deformation of porous spherical bodies under radial surface traction
Autorzy:
De Cicco, Simona
Powiązania:
https://bibliotekanauki.pl/articles/2200889.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
linear elasticity
materials with voids
equilibrium theory
spherical solids
Opis:
The paper deals with the linear theory of elastic materials with voids based on the concept of volume fraction. In this model, the interstitial pores are vacuous and can contract or stretch. The change in the volume fraction is measured by a scalar function, so that independent kinematical variables are four: the components of displacements and the volume fraction function. The equilibrium problem of elastic spherical bodies under radial surface traction is solved. The solution is given in closed form and applied to study three special cases. Explicit formulas of the displacement, stress distribution and volume fraction function are given.
Źródło:
Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 305--316
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of Municipal Wastewater Using Electrocoagulation Process
Autorzy:
Abshishek, H.
Vijayakumar, H.
Mahesh Kumar, C L
Shwetha, Kotagi Girisha
Powiązania:
https://bibliotekanauki.pl/articles/27314889.pdf
Data publikacji:
2023
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
electrocoagulation
municipal sewage
central composite design
CCD
response surface methodology
total suspended solids
TSS
elektrokoagulacja
ścieki komunalne
kompozyty
metodologia powierzchni odpowiedzi
RSM
zawiesiny
Opis:
Treatment of Municipal wastewater by Electrocoagulation (EC) process using punched aluminium and zinc electrodes was studied in a batch EC cell reactor. Response surface methodology (RSM) based on Central Composite Design (CCD) was utilized to optimize the operating parameters for the removal of % Total Suspended Solids (TSS) and % Chemical Oxygen Demand (COD) from Municipal Sewage. Effect of operating parameters such as Electrode Distance (x1), Electrolysis Time (x2) and Voltage (x3) has been optimized for the removal of TSS and COD. The prediction of removal percentage of TSS and COD in various Operational circumstances is done by using Quadratic model. The significance of each operating parameter was computed by Analysis of variance (ANOVA). To achieve the maximum removal of % TSS and % COD, the optimum conditions were Electrode distance(x1)-3 cm, Electrolysis Time (x2)-70.299 minute and Voltage (x3)-6.5V. It was observed that the performance of electrocoagulation process increased up to 61.45% for COD removal, and 73.73% for TSS removal using punched electrode compared to plane electrodes.
Źródło:
Civil and Environmental Engineering Reports; 2023, 33, 4; 1--13
2080-5187
2450-8594
Pojawia się w:
Civil and Environmental Engineering Reports
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wzrost i owocowanie wybranych odmian porzeczki czarnej
Growth and fruiting of selected blackcurrant cultivars
Autorzy:
Koniarski, Michał
Sitarek, Mirosław
Kubik, Monika
Powiązania:
https://bibliotekanauki.pl/articles/2232943.pdf
Data publikacji:
2023-07-12
Wydawca:
Centrum Doradztwa Rolniczego w Brwinowie. Oddział w Poznaniu
Tematy:
odmiany porzeczki czarnej
wzrost pędów
kwitnienie
plonowanie
masa owoców
ekstrakt
dojrzałość zbiorcza
zawartość chlorofilu
(SPAD)
black currants cultivars
shoot growth
flowering
yield
fruit weight
soluble
solids content
harvesting time
SPAD
Opis:
W doświadczeniu polowym założonym jesienią 2020 roku w Sadzie Doświadczalnym IO-PIB w Dąbrowicach oceniano wzrost i owocowanie młodych krzewów trzynastu odmian porzeczki czarnej (Ribes nigrum L.). Największą liczbę pędów wegetatywnych w pierwszym roku po posadzeniu wytworzyły krzewy odmian ‘Ben Lomond’, ‘Tisel’ oraz ‘Gofert’. Najmniej pędów stwierdzono u krzewów odmian: ‘Ruben’, ‘Titania’ i ‘Bona’. Najdłuższe pędy miały krzewy odmian ‘Polben’ i ‘Tiben’, zaś najkrótsze – ‘Ores’, ‘Öjebyn’, ‘Polonus’ i ‘Ruben’. Najdłuższymi gronami cechowały się odmiany ‘Tisel’ i ‘Gofert’. Najkrótsze grona miały odmiany ‘Bona’, ‘Ruben’ oraz ‘Ben Lomond’. Najwyższy plon w drugim roku po posadzeniu uzyskano z krzewów odmian: ‘Ben Lomond’, ‘Tihope’, ‘Tiben’, ‘Polben’, ‘Tisel’, ‘Gofert’. Najsłabiej plonowały: ‘Titania’, ‘Öjebyn’, ‘Ores’ oraz ‘Polonus’. Największe owoce, o masie ponad 2 g, wytworzyły krzewy odmiany ‘Bona’, natomiast najmniejsze owoce miały krzewy odmian ‘Polonus’ (0,9 g) i ‘Öjebyn’ (1 g). Najwyższą zawartością ekstraktu charakteryzowały się owoce odmiany ‘Gofert’, zaś najmniej ekstraktu miały owoce odmian ‘Ores’ i ‘Polben’. Pomiary intensywności zielonej barwy liści wykazały najwyższą wartość tego parametru u odmiany ‘Tines’, a najniższą – u odmian ‘Gofert’ i ‘Tisel'.
In a field experiment set up in autumn 2020 in the Experimental Orchard in Dąbrowice, the growth and fruiting of young bushes of thirteen cultivars of blackcurrant (Ribes nigrum L.) were assessed. The largest number of vegetative shoots in the first year after planting was produced by bushes of the cultivars 'Ben Lomond', 'Tisel' and 'Gofert'. The fewest shoots were found in the cultivars: 'Ruben', 'Titania' and 'Bona'. The longest shoots were found in the cultivars 'Polben' and 'Tiben', and the shortest – 'Ores', 'Öjebyn', 'Polonus' and 'Ruben'. The cultivars 'Tisel' and 'Gofert' had the longest cluster length. The shortest clusters were found in 'Bona', 'Ruben' and 'Ben Lomond'. The highest yield in the second year after planting was obtained from the 'Ben Lomond', 'Tihope', 'Tiben', 'Polben', 'Tisel', 'Gofert' cultivars. The lowest yields had 'Titania', 'Öjebyn', 'Ores' and 'Polonus'. The largest fruit, weighing more than 2 g, was produced by the 'Bona' cultivar, while the smallest fruit was produced by the 'Polonus' (0.9 g) and 'Öjebyn' (1 g) cultivars. The highest content of soluble solids was found in the 'Gofert' fruits, while the lowest was found in the fruit of the 'Ores' and 'Polben' cultivars. Measurements of the intensity of the green color of leaves (SPAD) showed the highest value of this parameter in the cultivar 'Tines', and the lowest - in the cultivars 'Gofert' and 'Tisel'.
Źródło:
Zagadnienia Doradztwa Rolniczego; 2023, 112, 2; 68-82
1232-3578
2719-8901
Pojawia się w:
Zagadnienia Doradztwa Rolniczego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
45 Years of Deliberations on the Thermo-Mechanical Interpretation of Friction and Wear. Part 2. The Microscopic Interpretation of the Tribological Proces
45 lat rozważań o cieplno-mechanicznej interpretacji tarcia i zużywania. Część 2. Interpretacja mikroskopowa procesu tribologicznego
Autorzy:
Sadowski, Jan
Powiązania:
https://bibliotekanauki.pl/articles/2171803.pdf
Data publikacji:
2022
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
friction heating
temperature
unit pressures
criterion of galling
intensive parameters
temperature gradient
disintegration of solids
switched nature of friction
nagrzewanie tarciowe
temperatura
naciski jednostkowe
kryterium zacierania
parametry intensywne
gradient temperatury
rozdrabnianie ciała stałego
impulsowy charakter tarcia
Opis:
In this second part, the pulse sources of heat, dependences among the intensive parameters of the friction process – temperature, unit pressures, friction velocity – and wear intensity, and some physical properties of the materials of solids in friction are presented. The flux densities are described in extensive quantities across the elementary surface dF of a nominal contact of solids. The thermodynamic criterion of galling is formulated, and the temperature characteristic of minimum wear and maximum resistance to wear is established. Minimum and maximum wear intensities and the specific work of wear are determined. It is proven that a temperature measured in a selected point of friction couple element does not uniquely characterise thermal processes in a tribological system. However, it does characterise the maximum gradient of temperatures measured in at least two points situated as close to a friction contact as possible. A method of determining unit real pressures is proposed. The presence of a cooling effect in the process of tribological wear is disclosed. Wear is interpreted as a disintegration of a solid caused by volumetric and superficial mechanical work. A system of new wear measures is suggested.
W drugiej części pracy przedstawiono impulsowe źródła ciepła, ustalono zależności między intensywnymi parametrami procesu tarcia – temperaturą, naciskami jednostkowymi, prędkością tarcia a intensywnością zużywania i niektórymi własnościami fizycznymi materiałów trących się ciał. Opisano gęstości strumieni wielkości ekstensywnych przepływających przez elementarną powierzchnię dF styku nominalnego ciał. Sformułowano termodynamiczne kryterium zacierania, ustalono temperaturę charakterystyczną dla minimalnego zużycia i maksymalnej odporności na zużywanie. Ustalono maksymalne i minimalne wartości intensywności zużywania oraz graniczne wartości pracy właściwej zużycia. Wykazano, że temperatura zmierzona w wybranym punkcie elementu pary tarciowej nie charakteryzuje jednoznacznie procesów cieplnych zachodzących w systemie tribologicznym, lecz maksymalny gradient temperatur, zmierzonych w co najmniej dwóch punktach położonych możliwie blisko styku tarciowego. Zaproponowano sposób wyznaczania jednostkowych nacisków rzeczywistych. Ujawniono występowanie efektu chłodzenia w procesie zużywania tribologicznego. Zużywanie zinterpretowano jako rozdrabnianie ciała stałego, wywołane wykonaniem pracy mechanicznej objętościowej i powierzchniowej. Zaproponowano system nowych miar zużycia.
Źródło:
Tribologia; 2022, 3; 87--100
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis and Simulation Performance of a Reverse Osmosis Plant in the Al-Maqal Port
Autorzy:
Yousif, Yasameen T.
Abbas, Abdulhussain A.
Yaseen, Dina Ali
Powiązania:
https://bibliotekanauki.pl/articles/2086424.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
reverse osmosis
Iraq
Basrah
Shatt Al-Arab
TDS
total dissolved solids
Winflows
Opis:
The Basrah province (southern of Iraq) was interested in establishing desalination plants to provide drinking water due to the high levels of salinity in its water resources. This work was carried out in order to evaluate and simulate the functionality of the reverse osmosis plant in the Al-Maqal port. From the field and laboratory measurement, this study concluded that the considered parameters of product water by reverse osmosis (RO) plant were within the Iraqi standard (IRS) limits. The calculation of operation indices showed that the recovery rate of plant (72%) and the permeate flux of plant (20 lmh) was within for limitation of brackish surface water. In turn, the plant has a low salt rejection (90.1%) and a high pressure drop (5 bar); therefore, the membranes require backwashing or chemical cleaning. Then, the performance of RO membrane was simulated by the Winflows software. The best operating parameters were identified. The coefficient of determination (R2) between simulated and measured TDS was 0.83. Therefore, the simulated TDS of permeate multiplied by 5.3 was given a good estimation for actual TDS within acceptable an error rate of 17%.
Źródło:
Journal of Ecological Engineering; 2022, 23, 5; 173--186
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applications of implicit constitutive theory for describing the elastic response of rocks and concrete
Autorzy:
Bustamante, R.
Rajagopal, K. R.
Powiązania:
https://bibliotekanauki.pl/articles/38695703.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
nonlinear elasticity
small strain
isotropic solids
Opis:
An implicit constitutive relation is proposed for elastic bodies, when the gradient of the displacement is assumed to be very small, and as a result the strains are small. The resulting constitutive relation is a non-linear relationship between the linearized strain and the stress. The model is used to fit data for rock and concrete. Some boundary value problems are studied within the context of homogeneous deformations, and also a problem with inhomogeneous deformations is analyzed, namely the inflation of a circular annulus. The predictions of this new implicit constitutive relation are compared with the predictions of the constitutive equations for linearized elastic bodies.
Źródło:
Archives of Mechanics; 2022, 74, 6; 513-547
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-simple elastic materials with double porosity structure
Autorzy:
De Cicco, S.
Powiązania:
https://bibliotekanauki.pl/articles/38695685.pdf
Data publikacji:
2022
Wydawca:
Instytut Podstawowych Problemów Techniki PAN
Tematy:
strain-gradient theory
porous solids
chiral materials
torsion of a circular cylinder
Opis:
This paper is concerned with a strain gradient theory of elastic materials that have a double porosity structure. Firstly, we present the basic equations and the boundary conditions of the nonlinear theory. Then, we derive the equations of the linear theory and present the constitutive equations for chiral materials. The theory is applied to study the deformation of a chiral cylinder. The materials with a double porosity are of interest in geophysics and in mechanics of bone.
Źródło:
Archives of Mechanics; 2022, 74, 2-3; 127-142
0373-2029
Pojawia się w:
Archives of Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of Hospital Wastewater Using Activated Sludge with Extended Aeration
Autorzy:
Custodio, María
Cuadrado-Campó, Walter
Peñaloza, Richard
Vicuña-Orihuela, Carmela
Torres-Gutiérrez, Elmer
Orellana, Edith
Powiązania:
https://bibliotekanauki.pl/articles/2202195.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
suspended solids
bacterial load
activated sludge
removal efficiency
hospital wastewater
Opis:
Hospital wastewater is of a complex nature and is generally discharged into urban sewage systems. This study evaluated the removal efficiency of organic and biological contaminants from a hospital wastewater treatment plant using extended aeration activated sludge. The study was conducted at a treatment plant scale, with 14 hours of feed. The plant consists of a pre-filter, a collector and crumbler tank, a homogenization tank, two biological reactors of 80 000 liters capacity each, two settlers and a contact disinfection chamber. Three flow rates of 3 L/s, 4 L/s and 5 L/s were tested in each biological reactor, with application of three concentrations of residual chlorine with sodium hypochlorite to the effluent of the settling tanks (0.3 ppm, 0.4 ppm and 0.5 ppm). The removal efficiency of suspended solids varied according to flow rate. The reactor with a flow rate of 3 L/s and 0.5 ppm of residual chlorine achieved the highest removal of suspended solids (91.95%), biological oxygen demand (97.52%) and fecal coliforms (99.99%). Finally, the quality of the hospital wastewater is within the limits of the national and international environmental quality thresholds.
Źródło:
Journal of Ecological Engineering; 2022, 23, 11; 24--32
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of the removal of BOD5, COD and suspended solids in subsurface flow constructed wetland in Latvia
Analiza usuwania BZT5, ChZT i zawiesiny ogólnej w sztucznym ekosystemie mokradłowym o poziomym przepływie podpowierzchniowym, zlokalizowanym na Łotwie
Autorzy:
Grinberga, L.
Grabuza, D.
Grinfelde, I.
Lauva, D.
Celms, A.
Sas, W.
Głuchowski, A.
Dzięcioł, J.
Powiązania:
https://bibliotekanauki.pl/articles/2084106.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
constructed wetlands
subsurface flow
BOD
COD
suspended solids
Opis:
This study aims to evaluate the performance of subsurface flow constructed wetland in Latvia which was established to receive storm water from surface runoff from a farmjard in agricultural area. As a part of this study, subsurface horizontal flow wetlands was monitored, in order to evaluate the changes in the efficiency of treatment depending on biological factors. The efficiency of horizontal subsurface flow constructed wetland was evaluated by comparing the concentration of total suspended solids (TSS), biochemical oxygen demand (BOD5) and chemical oxygen (COD) at inlet and outlet of the wetland depending on temperature and pH. Since June 2014, water quality monitoring in a research site in the farm “Mezaciruli”, Zaļenieku parish, Jelgava region has been carried out to treat the point source agricultural runoff from the impermeable pavements. The analysis of the data obtained in the monitoring allows to draw conclusions about the influence of certain factors in the subsurface flow constructed wetlands under the climate and environmental conditions in Latvia.
Źródło:
Acta Scientiarum Polonorum. Architectura; 2021, 20, 4; 21-28
1644-0633
Pojawia się w:
Acta Scientiarum Polonorum. Architectura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annual Variation in the Performance of Settat Wastewater Stabilization Ponds Located in Settat City, Morocco
Autorzy:
Dyaa, Abou-Tammame
Jihane, Fathi
Abdelhamid, Bouzidi
Powiązania:
https://bibliotekanauki.pl/articles/1955490.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
wastewater
natural lagoon
biochemical oxygen demand
chemical oxygen demand
suspended solids
sewage treatment
wastewater reuse
agriculture
Opis:
The wastewater treatment plant of Settat city uses the natural lagooning technology, which requires low maintenance cost and little technical expertise. The purpose of this study was to evaluate the stability of plant performance during two years of operation (2019 and 2020), as well as the safety of its treated wastewater for reuse in agricultural irrigation. The results of this study show that the biochemical oxygen demand (BOD5), chemical oxygen demand (COD) and suspended solids (SS) did not exceed the Moroccan standards for discharge. They also show a good stable pollutant load reduction with a mean of 86.44%, 86.89% and 74.61%, for BOD5, COD and SS, respectively. On the other hand, microbiological characterization classifies the treated wastewater as "B" quality water, because the fecal coliform numbers exceed the requirement for "A" quality (1000 CFU/100 ml).
Źródło:
Journal of Ecological Engineering; 2021, 22, 8; 153-164
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a Solar Powered Reverse Osmosis System in Egypt
Autorzy:
Ibrahim, Said M. A.
Shabak, Ahmed G. M.
Powiązania:
https://bibliotekanauki.pl/articles/2052247.pdf
Data publikacji:
2021
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
reverse osmosis
photovoltaic
total dissolved solids
TDS
pvro
desalination
odwrócona osmoza
fotowoltaika
całkowita ilość rozpuszczonych w płynie substancji
odsalanie
Opis:
Scarcity of fresh water, forced many countries to get their water needs, or part of it, by means of saline water desalination. Reverse osmosis (RO) systems are useful tools in this concern. In case the grid electricity is not available or costly, photovoltaic (PV) power is necessary to derive RO systems. The present paper is concerned with providing a methodology for complete sizing and design of a photovoltaic reverse osmosis (PVRO) system in Egypt. Egypt has very favorable solar energy. A computer program was constructed to solve the mathematical equations of the model to get the numerical values. The program is capable of calculating the solar irradiation for any city in Egypt. Calculations and selection of the RO system with all connected pumps, the peak PV power needed, and the actual PV area were performed for different water demands ranging from 1-100 m3/day, and various water total dissolved solids (TDSs) of 5000, 15000, and 30000 mg/l. The cost of the complete PVRO system was also determined. The concern of the paper is related to water desalination and solar energy, which are responsible for our existence. The work also aims toward sustainable and clean environment via utilizing solar energy.
Źródło:
Journal of Mechanical and Energy Engineering; 2021, 5, 2; 125-140
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydraulic gradient prediction for solid-water mixture flow through horizontal pipelines of different diameters and roughness and solids concentrations
Autorzy:
Osra, Faisal A.
Powiązania:
https://bibliotekanauki.pl/articles/1844347.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
deposit limit velocity
hydraulic gradient
hydraulic losses
slurry flow
solid concentrations
suspended solids
wastewater
Opis:
In wastewater treatment plants, large pumps are often used to accommodate unknown hydraulic properties of solid-water mixture flow. The use of large pumps translates into higher purchasing and operating costs. Wastewater mixture is pumped with solids of different types and concentrations through pipelines. The design of these ducts is mainly based on the hydraulic laws of solid-water mixture which is represented by a corrected friction coefficient corresponding to the concentration of solids in water. This paper experimentally studies hydraulic properties of solid-water mixtures in pipelines by the varying Froude number (Fr), which represents the velocity mixture, solid concentration, pipeline diameter and pipeline material type-roughness coefficient. The experiments have been conducted in the wastewater treatment plant where six solid concentrations can be found ranging from 2 to 12% by weight. The pipe diameter ranges between 100 to 300 mm. It has been found that both the friction coefficient and the hydraulic gradient ameliorate with the increase of the pipeline roughness and the solids concentration in the water mixture, whereas the Fr drop with the diameter of the pipeline. The results are translated into curves and equations to predict the corrected pipeline friction coefficient and the hydraulic gradient of the solid-water mixture flow through horizontal pipelines at various solids concentrations, roughness and diameters.
Źródło:
Journal of Water and Land Development; 2021, 49; 267-272
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 86

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