Treatment Of Protein Feed Production Wastewater With Coagulation Hydrolysis Acidification TSSBR

Extraction of protein feed from potato starch wastewater and residue can wellrecover organic resources?but still produces wastewater with high COD andnitrogen as well as phosphorus pollutants. Currently there are few reports on thetreatment of protein feed production wastewater. According to the protein feedproduction wastewater's feature of high COD and ammonia but a relatively low B/C?this research studies treating this kind of wastewater with a coagulation pretreatment?hydrolysis acidification+TSSBR treatment process?which is based on a lot ofreading of literature. The process has a short start cycle and is flexible to operate.Itshydrolysis acidification unit can effectively improve the biodegradability ofwastewater.The SBR process can well adapt to change of water quantity and qualityso that the processing system has a strong resistance to impact load.In this study?PAC?Al2(SO4)3?FeCl3are studied to treat the wastewater?oneof the best coagulants when dealing with the protein feed production wastewater isPAC. By orthogonal test analysis?this research determines the optimum coagulationconditions for PAC is pH at7.5?PAC dosage at0.8g/L?c mixing method?the settlingtime at35min. Orthogonal analysis results show that PAC dosage and pH are themost important factors which affect the PAC coagulation effect.When pH rangesfrom7.0to7.5?the coagulation effect of PAC is ideal.Hydrolytic acidification+TSSBR process starts successfully through20d. Thewhole system running in a good water quality and stability condition?the effluentNH3-N in the13~17mg/L?TN in22~26mg/L?TP less than1mg/L. Best HRT forhydrolysis acidification reactor is12h?in which COD removal rate reachs about34%and the reactor effluent acidification rate is well with a better biodegradability.Acidification rate is about19%and the B/C is increased from0.33to0.51.As theCOD of wastewater is enhanced?the hydrolysis acidification acidification rate isincreased but the COD removal efficiency is decreased.When the influent COD is at2000mg/L level?the optimum aeration andaeration time for SBR?is0.24m3/h and3h?the optimum aeration and aeration timefor SBR?is0.12m3/h and4h as well as a best anaerobic time of1h. The optimumsettling time for SBR?and SBR? is1h.When the system is operated stably underthe optimized process parameters?COD removal rate is about96.5%?the removalrate of NH3-N is in the91~94%?TN removal rate is about78%?TP removalefficiency is from92%to95%.The system effluent quality can meet the relevant standards.Stage in improving influent COD concentration?the system has a relativelyhigh COD effluent when the concentration gradient of each cycle begins.Byadjusting the level of TSSBR's aeration and aeration time?the system runs after7dto10d at each stage?the effluent COD concentration will be stabilized.COD removalefficiency is about96%?removal of TN is in the78%to81%?removal of TP is in94to97%. COD of the effluent is less than150mg/L?NH3-N is less than14mg/L?TNis less than26mg/L?TP is less than1mg/L.In this study? the hydrolysis acidification reactor kinetics is analyzed.According to its running data under stable condition?the kinetic constant K isobtained. The value of K is related to the reactor's HRT?sludge concentration?theinfluent concentration of organic matter. Hydrolytic acidification+TSSBR system'skinetics progression is validated?the result shows that the system's reaction ofdegradation of organic matter is between zero order and first-order reaction?whichtends to zero level.