Qidong Municipal Sewage Treatment Plant idamangidwa mchaka cha 2004. Kampaniyi imagwira ntchito kwambiri pakuchotsa zimbudzi zamatawuni.Mu Malo Opangira Madzi a Qidong City, mita yathu ya pH, mita ya oxygen yosungunuka ndi mita ina yabwino yamadzi agwiritsidwa ntchito bwino pakuchotsa zimbudzi za oxidation, ndikuwonjezera mphamvu pakumanga kwachitetezo cham'tawuni.
