Treatment Of Starch Wastewater With UASB

As a kind of high efficient equipment of waster treatment, Up-flow Anaerobic Sludge Blanket(UASB) has many advantages, such as effluent quality,steady operation, broad application on treatment high concentration organic wasters. Due to the high COD consistency of the wastewater from starch production,the expense of the treatment are always very high. In this paper, the experiments of the full-scale UASB treating sweet potato starch wastewater were studied. During the middle temperature condition, it has been studied that the influence of key factors, such as: temperature, alkalinity, nutrition element, trace element and so on. During the normal temperature condition, operation parameters have been optimized, then the functional conditons about several different concentration CODcr have been gained; in order to improve the quality of UASB effluent, some simple experiments that aerobic SBR used to treat the effluent were studied.The results of the experiments show that,it will improve activity and growth velocity of bacterium when N,P and NaHCO3 was added in the stable 38℃though the start-up research of UASB.When the concentration of CODcr in the influent is more 3000mg/L, HRT>36h; the concentration of CODcr in the influent is 2500～3000mg/L, HRT is 36h; the concentration of CODcr in the influent is 2000～2500mg/L, HRT is 18～24h.The extra experiment has been introduced, which was the study on the influence of trace element such as MgCl2, FeCl2, CoCl2, NiCl2 on aerobic granule sludge.On the base of key technologies, it has been analyzed that the feasibility of UASB to treat sweet potato starch wastewater during the normal temperature condition.The conclusion has been reached that it was feasible. The results of thetreatment's running shows that the treatment of wastewater from starch production by UASB possess the high COD removal rate and it is a low cost and feasible process.It proved that the treatment process eanbe widely occupied in the treatment of vastewater from the industry of bio-chemistry. It will bring great economical,social and environmental benefit.