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 okosijeni yosungunuka ndi mamita ena abwino amadzi agwiritsidwa ntchito bwino panjira yochotsa zimbudzi za oxidation, ndikuwonjezera mphamvu pakumanga koteteza zachilengedwe.
