Analysis on common problems of the wastewater treatment industry in urban China.

The wastewater treatment industry in urban China generally faces certain common problems. To provide a comprehensive analysis on common problems of the wastewater treatment industry, survey data from 467 wastewater treatment plants (WWTPs) and field investigation reports of 38 WWTPs were analyzed. The research results showed that, the common problems of the wastewater treatment industry are mainly concentrated in WWTPs and the drainage system.

Effects of magnesium chloride on the anaerobic digestion and the implication on forward osmosis membrane bioreactor for sludge anaerobic digestion.

This work elucidates the effects of model reversed salt MgCl on methane production in an anaerobic digestion bioreactor treating waste sludge. Along with MgCl concentration being raised stepwise, the methane production was only slightly less than in the control when MgCl was 20 g/L and under, and then suddenly reduced to only about 10 mL/(L·d) at a MgCl concentration of 30 g/L, and finally stopped when the MgCl concentration reached 50 g/L. However, the total relative abundance of methanogens Methanomicrobia and Methanobacteria still accounted for 84.