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《Environmental Science & Technology》 2011-01
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Effect of Wheat Straw on Acidogenic Phase of Low Concentration Wastewater in Two-phase Anaerobic Treatment

GUO Zhi-jun,HU Xiang(Department of Environmental Science and Engineering,Beijing University of Chemical Technology,Beijing 100029,China)  
Intermittent testing method was used to study the acidogenic phase of two-phase anaerobic process dealing with low concentration wheat straw-containing wastewater at different pH conditions.Effects of acidic,neutral and alkaline conditions on change of COD,ammonia nitrogen and VFA in the wheat straw-containing reactor and non-wheat straw-containing reactor were analyzed.Results indicated that in the three kinds of pH conditions,apart from the first cycle,the effluent pH of wheat straw-containing reactor was always lower than that of non-wheat straw-containing reactor,with effluent pH as the lowest under the acidic condition ranging from 5.43~6.00.The concentration of COD in the effluent of wheat straw-containing reactor was also higher than that of non-wheat straw-containing reactor,and in acidic,neutral and alkaline conditions,the concentration of the effluent COD increased the times of 1.04,1.61 and 1.24 than that of the influent COD in the first cycle of the wheat straw-containing reactor.COD removal efficiency of the wheat straw-containing reactor and non-wheat straw-containing reactor was the best under the acidic condition.Under 3 kinds of pH conditions,adding wheat straws can increase obviously the effluent ammonia concentration in the first 3 cycles of the reactor,while the removal efficiency of ammonia-nitrogen under the alkaline condition was better than those in the acidic and neutral conditions.Similarly,under 3 kinds of pH conditions,effluent VFA of wheat straw-containing reactor was always higher than non-wheat straw-containing reactor,and under the acidic and alkaline conditions,the acidification rate was higher than under the neutral conditions.
【Fund】: 国家水体污染控制与治理科技重大专项(2008ZX07209-007-004);; 北京市重点学科资助
【CateGory Index】: X703
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