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Tytuł:
Ocena składu fizyczno-chemicznego osadów ściekowych pochodzących z komunalnej oczyszczalni ścieków
Evaluation of the Physico-chemical Composition of Sludge from Municipal Sewage Treatment Plant
Autorzy:
Milik, J.
Pasela, R.
Szymczak, M.
Chalamoński, M.
Powiązania:
https://bibliotekanauki.pl/articles/1818029.pdf
Data publikacji:
2016
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
osady ściekowe
skład chemiczny
metale ciężkie
substancja organiczna
oczyszczanie ścieków komunalnych
sewage sludge
chemical
heavy metals
organic material
waste waters treatment
Opis:
Municipal sewage sludge are a by-product of waste water treatment. The problems of sludge associated with the development of sludge require urgent solutions. Municipal sewage sludge may be used in agriculture in two forms: processed and unprocessed if they are stabilized and comply with acceptable levels of heavy metals and sanitation indicators and include the relevant product quantities of organic compounds and fertilizing nitrogen, phosphorus and potassium. Composition and quantity of sludge produced in the wastewater treatment process is different and depends on several parameters such as quality of waste water and processes for their purification. The presents shows an assessment of the physical and chemical sludge from sewage treatment plants selected and the results of research and analysis for the sludge collected from said object. Analysis of the results was carried out for possibilities to use sewage sludge for agricultural purposes. Sewage sludge derived from a sewage treatment plant mechanical-biological stabilization of sludge anaerobic digestion with a capacity of 26,400 m3. per day. The sediment samples were collected in the period from January to September 2015 year with a two-month interval. Attempts were subjected to microwave mineralization in a closed system in aqua regia. The heavy metal concentrations determined with a spectrophotometer Coupled Plasma emission ICP-OES Perkin-Elmer Optima 8000 detecting elements P, Ca, Mg, Pb, Cd, Hg, Ni, Zn, Cu, Cr. The collected sediment were determined: pH, dry weight of sediment, organic matter (marked as loss on ignition at 550 ° C), total nitrogen (Kjeldahl) and ammonium nitrogen. The results were compared with the limit values according to the law. It has been shown that the predominant heavy metals present in the sludge was copper and zinc, mercury was not detected. The value of organic matter sludge tested ranged from 49.36 to 63.15% of dry matter. The content of heavy metals in sediments was measured by reference to the existing provisions governing the use of natural sewage sludge. The contents of heavy metals were low and did not exceed the limit values in sewage sludge for their use in agriculture and land reclamation. The studied sediments were stable nature. The results indicate the good properties of the sludge, which can be used as organic fertilizer. It has been shown that the sludge produced in the study treatment did not exceed in any case permissible concentrations of heavy metals specified for sewage sludge used for agricultural purposes. The annual average content of heavy metals in the study period remained at a similar level. Understanding the composition of the physico-chemical sludge waste is the basis for the decision over their processing, use or disposal. The precipitate may be disposed by using thermal methods for combustion of solid comprising 90% of dry matter.
Źródło:
Rocznik Ochrona Środowiska; 2016, Tom 18, cz. 2; 579-590
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dewatering of conditioned sludge in small wastewater treatment plants
Autorzy:
Wolny, L.
Powiązania:
https://bibliotekanauki.pl/articles/207409.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wastewater treatment
dewatering
filtration
polyelectrolytes
sewage sludge
sewage treatment
sewage treatment plants
water treatment plants
municipal wastewater treatment plants
wastewater treatment plants
oczyszczanie ścieków
odwadnianie
filtrowanie
polielektrolity
osady ściekowe
oczyszczalnie ścieków komunalnych
oczyszczalnie ścieków
Opis:
Parameters characterizing the dewatering process of sewage sludge in small wastewater treatment plants (WWTPs) have been analyzed. Two municipal wastewater treatment plants of comparable capacity and similar technology of sewage treatment were selected to the analysis. Comparison of dewaterability of unprepared and conditioned sludge was made. During preliminary tests, the capillary suction time (CST) of sludge conditioned with cationic polyelectrolyte was determined. Next, for the optimal doses of selected polyelectrolyte, more detailed technological experiments were conducted such as vacuum filtration and susceptibility to the gravitational thickening. Tested sludge had very low susceptibility to thickening. The final volume of unprepared tested samples after 2 hour thickening was 977.0 cm3, while the initial volume of thickened sludge was 1000 cm3.The lowest value of final hydration for conditioned sludge was 64.0%.
Źródło:
Environment Protection Engineering; 2015, 41, 2; 99-105
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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