Temat: biological phosphorus removal - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Optimization of induced crystallization reaction in a novel process of nutrients removal coupled with phosphorus recovery from domestic wastewater
Autorzy:: Zou, H.
Wang, Y.
Powiązania:: https://bibliotekanauki.pl/articles/205404.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: phosphorus recovery
induced crystallization
IC
hydroxyapatite
HAP
domestic wastewater
enhanced biological phosphorus removal
EBPR
Opis:: Phosphorus removal and recovery from domestic wastewater is urgent nowadays. A novel process of nutrients removal coupled with phosphorus recovery from domestic sewage was proposed and optimization of induced crystallization reaction was performed in this study. The results showed that 92.3% of phosphorus recovery via induced Hydroxyapatite crystallization was achieved at the optimum process parameters: reaction time of 80 min, seed crystal loads of 60 g/L, pH of 8.5, Ca/P mole ratio of 2.0 and 4.0 L/min aeration rate when the PO₄³-P concentration was 10 mg/L in the influent, displaying an excellent phosphorus recovery performance. Importantly, it was found that the effect of reaction temperature on induced Hydroxyapatite crystallization was slight, thus favoring practical application of phosphorus recovery method described in this study. From these results, the proposed method of induced HAP crystallization to recover phosphorus combined with nutrients removal can be an economical and effective technology, probably favoring the water pollution control and phosphate rock recycle.
Źródło:: Archives of Environmental Protection; 2017, 43, 4; 33-38
2083-4772
2083-4810
Pojawia się w:: Archives of Environmental Protection
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Wpływ jonów chlorkowych na efektywność biologicznej defosfatacji ścieków
Effect of chloride ions on the efficiency of enhanced biological phosphorus removal from wastewater
Autorzy:: Zdybek, I.
Powiązania:: https://bibliotekanauki.pl/articles/236782.pdf
Data publikacji:: 2005
Wydawca:: Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:: oczyszczanie ścieków
defosfatacja
usuwanie fosforu biologiczne
zasolenie
chlorki
wastewater treatment
phosphorus removal
biological phosphorus removal
salinity
chlorides
Opis:: Analizę oddziaływania jonów chlorkowych na efektywność procesu wzmożonego biologicznego usuwania fosforu ze ścieków (EBPR - Enhanced Biological Phosphorus Removal) przeprowadzono w laboratoryjnym układzie bioreaktorów sekwencyjnych (SBR), pracujących w cyklu beztlenowo-tlenowym, dla dwóch różnych soli, tj. chlorku sodu i chlorku potasu, w zakresie zawartości chlorków od 200 gCl-/m3 do 5000 gCl-/m3. Warunki prowadzenia badań pozwoliły na całkowitą inhibicję procesu nitryfikacji, a tym samym na wyeliminowanie możliwości negatywnego oddziaływania azotanów na proces EBPR. Wykazano zasadniczo niewielki wpływ chlorków na efektywność defosfatacji ścieków w zakresie najniższych analizowanych stężeń, tj. 200 gCl-/m3 i 500 gCl-/m3. W tych warunkach osiągnięto stosunkowo wysoką skuteczność usuwania związków fosforu (79,8÷98,6%), co odpowiadało względnie niskiej zawartości fosforu w ściekach oczyszczonych (0,7÷10,0 gP/m3). Odnotowywano przy tym bardzo wysoki poziom akumulacji fosforu w osadzie, tj. około 19% (w przeliczeniu na suchą masę organiczną). Dla wyższej zawartości chlorków zaobserwowano inhibicję procesu EBPR. Zawartość związków fosforu w ściekach oczyszczonych wzrosła do 30,5 gP/m3 i 44,0 gP/m3, odpowiednio dla NaCl i KCl, w wypadku najwyższej analizowanej zawartości chlorków 5000 gCl-/m3. Tym samym efektywność usuwania fosforu spadła do 36,0% dla NaCl i 11,1% dla KCl. Wyniki te potwierdził zaobserwowany spadek akumulacji fosforu w osadzie, odpowiednio do 7,9% i 1,7%. Wyniki te zwróciły także uwagę na istotne znaczenie różnic oddziaływania kationów sodu i potasu na efektywność wzmożonego biologicznego usuwania fosforu ze ścieków.
The effect of chloride ions on the process of enhanced biological phosphorus removal (EBPR) from wastewater was examined in an anaerobic-aerobic laboratory setup of sequencing batch reactors (SBRs) for two different salts: NaCl and KCl, in the chloride concentration range from about 200 to 5000 gCl-/m3. Under such experimental conditions, it was possible to achieve full inhibition of the nitrification process and thus eliminate the adverse influence of nitrate on the EBPR. The experimental results generally showed no significant effect of chlorides on the EBPR process at low concentrations (200 and 500 gCl-/m3). The efficiency of phosphate removal was then comparatively high (79.8 to 98.6%), which corresponded with the relatively low phosphorus concentrations in the treated wastewater (0.7 to 10.0 gP/m3). Phosphate accumulation in the sludge was very high (about 19% VSS). At higher chloride concentration the EBPR was found to be inhibited. Phosphate concentrations in the treated wastewater increased to 30.5 and 44.0 gP/m3 for NaCl and KCl salts, respectively, when the concentration of chlorides approached 5000 gCl-/m3. At the same tome, the efficiency of the EBPR dropped to 36.0% and 11.1% with NaCl and KCl, respectively, and phosphorus content in the sludge decreased to 7.9% and 1.7% VSS, respectively. The experiments revealed notable differences between the influence of potassium ions and that of sodium ions on the efficiency of the EBPR process.
Źródło:: Ochrona Środowiska; 2005, R. 27, nr 2, 2; 13-17
1230-6169
Pojawia się w:: Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Wpływ procesu filtracji na relację między ilością substancji organicznych i związków biogennych w ściekach mleczarskich
The influence of the filtration process on the content of organic compounds in relation to the concentration of nutrients in dairy wastewater
Autorzy:: Ostrowska, K.
Janczukowicz, W.
Rodziewicz, J.
Mielcarek, A.
Powiązania:: https://bibliotekanauki.pl/articles/1819041.pdf
Data publikacji:: 2013
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: proces filtracji
ilość substancji
volatile fatty acids
biological phosphorus removal
sequencing batch reactors
denitrification
wastewaters
fermentation
systems
Opis:: Nowadays, high effective carbon, nitrogen and phosphorus removal based on activated sludge is the most popular method of dairy wastewater treatment. In activated sludge systems efficient nutrient compounds removal is determined by the quantity and quality of easily available forms of organic carbon. For both biological phosphorus removal and biological nitrogen removal to occur, an easily biodegradable carbon source must be present in the treating wastewater. The organic compounds used in the processes of denitrification and enhanced biological phosphorus removal (EBPR) usually are presented in treating wastewater, what is called an internal source of carbon. However, many industrial wastewater, including dairy wastewater, very often do not have sufficient amounts of carbon, in relation to the concentration of nitrate and phosphates, to ensure efficient both denitrification and biological dephosphatation processes. When biological nitrogen and phosphorus removal is limited by the availability of easily biodegradable forms of organic carbon a supplemental carbon source must be add to the wastewater, hence so-called external source of carbon should be applied to provide energy necessary for the nutrient removing bacteria to grow and perform their work. One of the most popular sources of organic carbon is acetic acid, which is one of the best available forms of carbon by denitrifying bacteria and those accumulating polyphosphates (PAO). Apart from acetic acid and acetates use is made of a number of the volatile fatty acids (VFA), including propionic acid, butyric acid, valeric acid, and such substrates as: glucose, methanol or ethanol. Since the use of chemical compounds in the form of technical products (e.g. acetic acid, citric acid) is generally expensive, cost-saving solutions are sought. According to literature data, wastewater with high COD/(N + P) ratio after acidogenic fermentation can be used as an external source of VFA in wastewater with low concentrations of easily available organic compounds treatment. The aim of this study was to determine the influence of the filtration process on the content of organic compounds (measured as COD) in relation to the concentration of nutrients (measured as the sum of TKN and TP) in process dairy wastewater, in terms of the possibility of effective VFA production. It was observed, that filtration process ensures improvement of the COD/(N + P) ratio only in wastewater from the selected sections of dairy production. The best result, if percentage increase of the COD/(N + P) ratio is considered, was obtained for the wastewater from butter production. Densification of wastewater from butter production resulted in 95% increase of the COD/(N + P) ratio without a significant increased nutrient concentration. Filtration process provided the highest COD/(N + P) ratio (219,18 mg O2/(mg N + mg P)) and reduced both nitrogen and phosphorus concentrations in the permeate from the apparatus room. The results obtained suggest, that acidogenic fermentation of wastewater from the apparatus room and butter production with high COD/(N + P) ratio can serve as an external source of VFA in biological wastewater treatment process of wastewater with low concentrations of easily available organic compounds, which ensures effective nitrogen and phosphorus removal.
Źródło:: Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 2; 1411-1425
1506-218X
Pojawia się w:: Rocznik Ochrona Środowiska
Dostawca treści:: Biblioteka Nauki

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