| Water environment pollution and eutrophication problem has become a global problem,and has become a limit for national economic and social sustainable development bottleneckproblem. Fundamental measure to solve the water environment pollution and eutrophication isto control and govern nitrogen and phosphorus pollution. To solve above problems putsforward the compound iron enzymatic active sludge strengthen biological denitrification andphosphorus removal technology,combing with the actical situation of Xue cheng sewagetreatment plant in Zaozhuang City and making enhance the sewage treatment biochemicalunit nitrogen and phosphorus removal function as the main research goals. The paper makinginvestigating removal capacity of nitrogen and phosphorus of ferric enzymatic activatedsludge, and carrying out test and productive experimental study on nitrogen and phosphorusremoval.The research content includes:①Under the condition of aeration lasted twohours,chosing the aeration30min,35min,40min,45min four dosing iron salt pointsstudying on organic matter and nitrogen and phosphorus removal ability differences to findout the best dosing point.②Composite iron enzymatic active sludge was compared with theordinary active sludge on dehydrogenase activity. under different temperature conditions.③Composite iron enzymatic active sludge was compared with the ordinary active sludge onnitrogen and phosphorus ability.④The study on composite iron enzymatic active sludgesystem on the ability to resist impact of pharmaceutical wastewater.⑤Field test research.onimproving ICEAS process of denitrification and phosphorus removal capacity with compositeiron enzymatic active sludge.Experimental research conclusions:(1) For sequencing batch reaction,aeration40min casting iron to remove organic matterand nitrogen and phosphorus effect is best among aeration30min,35min,40min,45mindosing ferric salts. Aeration40min dosing ferric salt removal rate of NH4+-N, COD, TN,PO43--P is respective (92.6±2.3)%,(81.8±2.1)%,(53.7±4.6)%,(85.2±12.9)%.(2) SV30minof composite iron enzymatic active sludge is15%~17%, SV30minof ordinaryactive sludge is20%~23%.The iron salts can cause the changing of the sludge flocs structure, making the sludge particles become more dense and sludge settling performance better.(3) TTC-DHA of composite iron enzymatic active sludge increased by17.98%thannormal activated sludge under the temperature of12~16, increased by10.79%under thetemperature of17~24.It shows that iron can improve dehydrogenase activity of activatedsludge microorganisms and influence on dehydrogenase activity.is more significant under thecondition of low temperature in winter.(4) The removal rate of COD is86.81%~88.70%using composite iron enzymatic activesludge under the conditions of different temperature. The average removal rate of COD is80.89%~83.83%using common activated sludge system. Composite iron enzymatic activesludge system is better on COD removal effect.(5) The phosphate removal rate is respective71.89%,74.06%,49.97%after adding ironunder three temperature conditions of12~15℃,15~20℃,20~25℃. The phosphate removalrate is better under the condition of low temperature than the normal temperature.This isbecause the plant has low phosphate content in the water. The quantity of iron is more fullunder the condition of low temperature in winter. Chemical phosphorus removal effect ismore obvious.It shows that chemical phosphorus removal effect has significant effects on theplant phosphate removal.(6) Nitrate nitrogen level is respective （15±2）mg/L,（12±2）mg/L,（12±2）mg/L，after adding iron under three temperature conditions of12~15℃,15~20℃,20~25℃.Nitratenitrogen is higher in low temperature, which is beyond the effluent standards. The totalnitrogen removal rate is respetive32.42%,40.97%,41.46%. The removal rate of TN isgenerally low, this is mainly due to lack of anaerobic, anoxic process. |
PDF Full Text Request