Removal of dyes from aqueous solution by activated carbon from sewage sludge of the municipal wastewater treatment plant

Abstract The decomposition of diclofenac (DCF) in sewage sludge from municipal wastewater treatment plant was investigated. It was found that adsorption of DCF on sludge is about 40%. Compared to previous studies, where the degradation yield in aqueous solution was 100%, in those experiments at the dose up to 5 kGy, only 50% of initial DCF concentration of 50 mg L−1 was decomposed in sediment and in solution over the sediment. The experiments were carried out using both gamma radiation and electron beam. It has been observed that DCF in the aqueous phase, above the sediment, was decomposed with the same efficiency using both gamma radiation and electron beam. Whereas for DCF in the sediment, a higher degradation efficiency was found when gamma radiation was applied. This is most likely due to the limited penetration depth of the electron beam into the sludge layer. It was shown that the applied peroxide addition (in a stoichiometric amount needed for complete mineralization of 50 mg L−1 DCF) did not cause increase in yield of DCF decomposition.

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Studies on the cytotoxicity of filtrates obtained from sewage sludge from the municipal wastewater treatment plant

10.5004/dwt.2020.25323 ◽

2020 ◽

Vol 186 ◽

pp. 29-38

Author(s):

Agata Jabłońska-Trypuć ◽

Urszula Wydro ◽

Lluis Serra-Majem ◽

Andrzej Butarewicz ◽

Elżbieta Wołejko

Keyword(s):

Wastewater Treatment ◽

Sewage Sludge ◽

Wastewater Treatment Plant ◽

Municipal Wastewater ◽

Treatment Plant ◽

Municipal Wastewater Treatment ◽

Municipal Wastewater Treatment Plant

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Can a wastewater treatment plant be a powerplant? A case study

Water Science & Technology ◽

10.2166/wst.2008.215 ◽

2008 ◽

Vol 57 (10) ◽

pp. 1555-1561 ◽

Cited By ~ 28

Author(s):

N. Schwarzenbeck ◽

W. Pfeiffer ◽

E. Bomball

Keyword(s):

Energy Efficiency ◽

Wastewater Treatment ◽

Sewage Sludge ◽

Wastewater Treatment Plant ◽

Municipal Wastewater ◽

Treatment Plant ◽

Anaerobic Sludge ◽

Organic Substrates ◽

Municipal Wastewater Treatment ◽

Municipal Wastewater Treatment Plant

Today wastewater treatment plants are evaluated not only in terms of their treatment efficiency but also concerning their energy efficiency. Increasing energy efficiency can be realized either through operational optimisation or by realising an already existing potential for energy generation on-site. The main source of energy at a municipal wastewater treatment plant is the biogas produced in the anaerobic sludge digester. Studies indicate excess digester capacities of about 20% in Germany available for co-fermentation of organic substrates other than sewage sludge. This paper presents an example of a municipal wastewater treatment plant going towards an energy self-sufficient operation and even a surplus energy production as the result of an increasing co-fermentation of sludge from grease skimming tanks. In 2005 on average 113% of the electricity consumed for plant operation was generated on-site in gas engines. Co-fermentation of about 30% (related to the total dry residue input) of grease interceptor sludge in the presented case does not only effect a 4-times increased gas yield, but also an intensified 20% higher anaerobic degradation of the organic matter of the sewage sludge and thus having a positive influence not only on the energy and financial balance but also on the anaerobic sludge stabilisation with respect to the degradation degree of the organic fraction.

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