Study On Sewage Advanced Treatment Rfom Sewage Urban Treatment Plant By Using An Anaerobic-aerobic Treatment Process

Based on the problem of sever pollution of the Haihe River of Beijing areais，In order toreduce the pollution and improve the ability of self-repair of Haihe River. A standard patternservice contract has been issued by Environmental organization, calling for sewage dischargewater quality CODcr <30mg/L, NH3-N <1.5mg/L. At present,the treated water quality notonly is stable but also meets the national level of discharging standard.Therefore,This projectis proved to study a kind of highly efficient,low energy consumption and easy operationtechnique,the effluent of the system can stably meet the first grade A standards of “UrbanSewage Disposal Conamination Integrated Discharge Standard”(DB11/890-2012), providesthe reference for its kind.This research is based on the current results of stuy regarding municipal wastewaterbiological treatment works both in domestic and outside and four aspects about themunicipal wastewater biological treatment works and method have been studiedpreliminarily in this dissertation.The depth of processing on the secondary effluent fromsewage treatment plant was discussed from the physisical and chenmical techniques,biotechniques,etc.(a)the preprocessing stage: compared the Sewage treatment effect andthe running cost of micro-electrolysis, Fenton oxidation method and Fenton oxidationmethod coupling iron carbon micro-electrolysis, the optimum technological parameters ofpretreatment.(b) Anaerobic technology is used to treat the secondary effluent from municipalsewage plant,and the influence of various factors of anaerobic technology on CODcrremoval is investigated.(c)Aerobic technology makes use of all the advantage ofimmobilized microorganisms and SBR,not noly retains the immobilized microorganisms,butalso makes use of the mature SBR technology.The main results and conclusion：Stage1:This preprocessing stage studied the deep treatment procedures of urbanwastewater using micro-electrolysis, Fenton oxidation method and Fenton oxidation methodcoupling iron carbon micro-electrolysis and the influence of pH,reaction time, Fe2+concentration,H2O2concentration,and so on.And then we got the optimum conditions ofvarious reaction. Three kinds of physical treatment method of iron carbon micro electrolysisand the best treatment effect, and the optimum condition for: iron carbon mass ratio is2:1,sponge iron dosage is20g/L, and the pH is5, reaction time60min, for CODcr、TP.TheCODcr and TP removal rate of iron carbon micro-electrolysis pretreatment on the city sewagecan reach45%,88%, respectively;the operating costs is0.13yuan/m3. Stage2: at room temperature, the pH of6~9,in the three carriers，as the effect of the1#carrier （named sponge iron activated carbon as the carrier）is better than other carriers. Frominoculation dometion to bioflim maturation,1#carrier can be hung membrane after15days,but other carriers is still unstable after15days in the reactor. The operation parametersare set as follows:HRT is10h, temperature is around of18-20℃in the test.The outlet concentration of CODcr, total nitrogen is22mg/L、13.7mg/L.the treatment effectof CODcr and total nitrogen removal rate reached60%and48%, the NH3-N removal effect isnot obvious.Stage3:the stage of immobilized microorganisms and SBR:in the carriers, as hungmembrane effect of the carrier (named nanometer attapulgite composite hydrophilicpolyurethane foam immobilized carrier) with larger specific surface area, high pore rate andthree-dimensional structure is better than other carriers. HRT is6h, DO is around of4mg/L,temperatures is around of20°C in the test.From the test result,it can be indicated that thetreatment effect of1#carrier is best an these operation parameters. When the averageCODcr, NH3-N and TN of influent is56mg/L,15mg/L and28mg/L,the averageCODcr, NH3-N and TN of effluent is29mg/L、1.0mg/L and14.5mg/L. After the treatment,the removal efficiency of chemical oxygen demand、NH3-N and TN were48%,93%and48%,respectively. the effluent quality can meet requirement of the Beijing city Sewage DischargeStandards.Stage4:Ultimately determined the combination process for iron carbon city sewage planteffluent+Anaerobic+aerobic filter combination SBBR reaction, the technology is timesaving,simple operation and low cost in using the combination technology for treatment ofwaste water. the influent CODcr concentration was59mg/L, NH3-N concentration was13mg/L,effluent CODcr, NH3-N concentrations were20mg/L and1.0mg/L, respectively. Usingthe technology the effluent water can meet Grade B requirement of “Urban Sewage DisposalConamination Integrated Discharge Standard”(DB11/890-2012) for dischargingwastewater.the.combined process exhibits advantages such as small land occupation, low cost,easy maintenance and management.Based the above experiments, the results for the degradation of sewage deep treatmenttechnology explore a new way.