Eeprimental Study On Treatment Of Diary Wastewater By Using Combination Process Of Anaerobic Hydrolysis Acidification And Bio-contact

The experiment bases on hydrolytic acidification - biological contact oxidation process treats diary wastewater,which conrains two parts - hydrolytic acidification and bio-contact oxidation.The experiment research show that the process operate stably,and effluent quality able to meet the national requirements related to emissions.Hydrolytic acidification process make use of anaerobic fermentation of the first and second stage.Bio-contact oxidation is better than activated sludge and able to withstand high volume load and impact load,.It have a wider adaptability,which be avoided the selection of sludge bulking and be easy to control the actual operation.Treatment plant make use of activated sludge inoculation method to start and culture for 60 days.COD removal rate maintained at 80%- 90%during the culturing bio-microbiology,and COD removal rate is 40%- 60%in hydrolytic acidification.Influent colority is the 45 - 425times during culturing bio-microbiology,effluent colority maintained at 70 time below,hydrolytic acidification plays a major role in the colority removal,the removal rate of 27%to 55%,which stable at 55%in the late culturing bio-microbiology,in the late culturing bio-microbiology,and first bio-contact oxidation process stables at color removal rate of 45%,and second bio-contact oxidation process stables at color removal rate of 40%.The experiment research show that COD in the influent is constant(average COD is 3403.23 mg / L - 3471.87 mg / L),temperature,DO and pH will remain basically unchanged when the hydraulic retention time with increasing HRT,and hydrolytic acidification of the COD removal is also gradually increasing large.The average effluent COD declines from 2141.23 mg / L to 1707.46mg / L,COD removal rate increased to 30.97%from 51.9%.Experimental study shows that the organic load in the experimental condition,when the hydrolytic acidification HRT=30h,COD removal efficiency stable at the average on 36.95%, and the content of NH₄⁺ higher in effluent,and colority removal rate reached 48.85%.At the same time,the experiment study on mainly the bio-contact oxidation process of the HRT, and the ratio of air to water and volume load(Nv) effect upon the removal process of COD, NH₄ ⁺,colority and the formation process of NO₃^-.When the best bio-contact oxidation HRT stable at 16h,the average COD of effluent is 194.52mg / L in first contact oxidation process,the average removal rate is 90.25%;the average COD of effluent is 53.9mg / L in second contact oxidation,the average removal rate is 69.17%.The average NH₄⁺ of effluent is 28.71 mg / L in first contact oxidation process,and the average removal rate is 75.52%;the average NH₄⁺ of effluent is 20.37mg / L in second contact oxidation,and the average removal rate is 29.10%;the average colority of effluent is 100 times in first contact oxidation process,and the average removal rate is 50.61%;and the average colority of effluent is 55 times in second contact oxidation,the average removal rate is 44.82%.Through analyzing Ammonia removal efficiency,we know that the decreasing amount of NH₄⁺ and the increasing amount of NO3" is not consistent,perhaps the fact that some NO₂^- is not translated into NO₃^-.When it operates at full capacity,DO from3.1 mg/Lto4.3 mg/L,temperature from 20 to 22℃,the best gas-water ratio of 20:1.