Stable nitritation is a critical bottleneck for achieving autotrophic nitrogen removal using the energy-saving mainstream deammonification process. Herein we report a new strategy to wash out both the Nitrospira sp. and Nitrobacter sp. from the treatment of domestic-strength wastewater. The strategy combines sludge treatment using free nitrous acid (FNA) with dissolved oxygen (DO) control in th...

Treating endocrine disrupting compounds (EDC’s) in domestic wastewater has become a major concern for the safety of human health and the environment. Human derived EDC’s, such as 17βestradiol are present in domestic wastewater effluent at levels high enough to jeopardize normal endocrine functions of aquatic organisms leading to decreased fecundity and feminization. In wastewater treatment faci...

Domestic sewage sludge and cattle manure are rich in nutrition elements, but without proper disposal, are harmful to the environment. Here with an indoor culture method, we used Eisenia fetida to dispose different ratios of sewage sludge and cattle manure, and thereby investigated the effects and acting rules of these sludge-manure mixtures on the growth and reproduction of E. fetida. We find t...

Sewage sludge is used as fertiliser and contains nutrients required for plant growth. It also contaminants that can leach into crops. The effects of sewage on kale plants were investigated. Mixture ratios 50:50 20:80 soil prepared. soil-sludge blends analysed selected metal residues. Kale seedlings 10-13 cm planted the different combinations. Leaf lengths measured 21 days post transplanting fou...

ABSTRACT This study aims to evaluate potential ecological risks and heavy metal pollution in sewage sludge. For these purposes, domestic sludge samples were collected for a period of one year from wastewater treatment plant Bursa, Turkey analyzed metals. The average content the was wherein decreasing order Zn>Cu>Ni>Cr>Pb>As>Se>Cd. As whole, concentration metals below limit values indicated with...

the objective of this research was to conduct a bench scale study of fixed activated sludge treating domestic sewage. two different units employing diffused aeration with plastic and aluminum media were studied in four separate phases. data indicated that the system could produce a high quality effluent without any requirements for sludge recycling through the system. suspended solids concentra...