Tests are conducted on the mutagenicity and acute toxicity of raw water sample,tap water sample,and filtered water sample from two sources by means of Ames test and luminescent bacterium bioassay.

The conversion rate of NH_4~+-N by nitrifying bacteria in filtering troughs of Takingfugu obscurus;

Study on the characteristic of granular bed filter at normal temperature;

Colophony Wastewater Treatment by Anaerobic-aerobic-filter Process;

Process research of second stage reaction at preparing cryolite from fluosilicic acid——quality,appearance and filtering performance of cryolite;