Paramenters Research And Project Implementation For Ammonium Removal Process Of Wastewater From Fur Production

Fur industry, which relied on water, owned large water consumption andhigh concentrated wastewater with various pollutants. The emission of vastquantity of ammonia nitrogen in wastewater was especially difficult to reach thestandard in current situation. As ammonia nitrogen was one of major pollutantsof water pollution control during the12^thFive Year in China, it had beenincluded in national pollutant total emission control system. Ammonium removalfrom fur production wastewater had become a hot issue because it ’s hard toremoved and its emission control was strict.In order to explore the feasibility of ammonium removal of wastewaterfrom fur production by Anaerobic-Oxic process（AO process）, engineeringreconstruction of WWTP（wastewater treatment plant） in a fur company inZhejiang province was implemented. Under this background, current situationand general existent problem of treatment of wastewater from fur production wasinvestigated, ammonium removal parameters of AO process was determined, andengineering reconstruction was designed according to the parameters.The results showed as follows.（1） Because of the complicated process of fur manufacturing and effluentquality of each section changes a lot, wastewater from fur production hasproperties of instability of quantity and great fluctuation of quality. Ammonianitrogen concentration was from90mg/L to196mg/L, neutral salt （Cl^-）concentration was from4539mg/L to8672.2mg/L. The method of traditional activated sludge was widely used in fur companies, and ammonia nitrogenconcentration of effluent from this process couldn’t up to standard.（2） Parameters of lab-scale test of AO process were confirmed as follows,Pool A, Hydraulic retention time （HRT）:10h; Pool O, HRT:10h; nitrated liquidreflux ratio,100%. Activated sludge used in test was taken from municipalsewage treatment plant, which acclimated as anaerobic activated sludge and oxicactivated sludge respectively. Neither alkalinity nor temperature was regulatedduring the test, and no carbon source was supplemented during the process ofdenitrification. The operation of system was steadily in one week, ammonianitrogen concentration of effluent was below15mg/L which reached thestandard.The research showed that ammonium removal efficiency increased becauseof changing biological system from traditional activated sludge method to AOprocess, longer HRT and high content of microorganism in activated sludge.Ammonium removal of wastewater from fur production by AO process becamefeasible.（3） It was feasible to adopt AO process in design of engineeringreconstruction of WWTP in fur companies.General situation of original processing units in WWTP were as follows,volume of aeration regulation tank was750m³, HRT:12h; volume ofsedimentation tank was1200m³, HRT:16h; volume of aerobic tank was1000m³, HRT:10h; volume of secondary sedimentation tank was300m³, HRT:3h.Original processing capacity couldn’t satisfy the demand of development of thecompany.So a new aeration regulation tank was built to expand regulation capacity, anew sedimentation tank and a new hydrolysis acidification tank were alsoestablished. The previous sedimentation tank were reconstructed into an aerobicbiochemical tank.The blue print of engineering reconstruction of WWTP was accepted by thecompany, but project implementation didn’t finished, the rationality of the projectwould be proved after the operation of WWTP was steady.