CAJ | 학술논문

研究了不同pH值下污泥脱水性能和束缚水含量的变化,通过测定污泥调理过程中各层胞外聚合物( S-EPS、LB-EPS和TB-EPS)中蛋白质和多糖的含量、S-EPS中有机官能团以及有机酸的含量,探讨了胞外聚合物对污泥脱水性能及束缚水含量的影响.酸性条件下,污泥的脱水性能明显好于中性条件,并且pH值为3.03时,污泥滤饼含水率( WC)和毛细吸水时间( CST)均降至最低,分别为60.8%和25.4 s；碱性条件下,污泥中束缚水的含量明显增加,WC和CST均大幅升高,污泥脱水性能恶化.酸碱的加入导致污泥中TB-EPS含量降低,LB-EPS和S-EPS含量升高,并且EPS各层组均与WC、CST以及束缚水含量具有很强的相关性,其中S-EPS与污泥脱水性能以及束缚水含量的相关性最显著.酸碱调理过程中,部分EPS水解生成有机酸等小分子有机物,S-EPS中有机官能团的总量和种类都有明显增多.
연구료불동pH치하오니탈수성능화속박수함량적변화,통과측정오니조리과정중각층포외취합물( S-EPS、LB-EPS화TB-EPS)중단백질화다당적함량、S-EPS중유궤관능단이급유궤산적함량,탐토료포외취합물대오니탈수성능급속박수함량적영향.산성조건하,오니적탈수성능명현호우중성조건,병차pH치위3.03시,오니려병함수솔( WC)화모세흡수시간( CST)균강지최저,분별위60.8%화25.4 s；감성조건하,오니중속박수적함량명현증가,WC화CST균대폭승고,오니탈수성능악화.산감적가입도치오니중TB-EPS함량강저,LB-EPS화S-EPS함량승고,병차EPS각층조균여WC、CST이급속박수함량구유흔강적상관성,기중S-EPS여오니탈수성능이급속박수함량적상관성최현저.산감조리과정중,부분EPS수해생성유궤산등소분자유궤물,S-EPS중유궤관능단적총량화충류도유명현증다.
The changes of sludge dewaterability and bound water content at various pH values were investigated in this study. The protein and polysaccharide contents in each layer of extracellular polymeric substances ( S-EPS、LB-EPS and TB-EPS) and the organic acid and organic functional group contents in S-EPS were determined in an attempt to explain the influence of EPS on the sludge dewa-terability and bound water content. The results indicate that the sludge dewaterability under acidic conditions is obviously better than that under neutral conditions, and the water content of dewatered sludge ( WC) and the capillary suction time ( CST) can be decreased to 60. 8% and 25. 4 s at pH 3. 03, respectively. Under alkaline conditions, the bound water content in dewatered sludge, the WC and CST significantly increase, and the sludge dewaterability deteriorates. The addition of acid or alkali reduces TB-EPS, on the contrary, increases LB-EPS and S-EPS. Each layer of extracellular polymeric substances has significant correlation with the WC, CST and the bound water content, and S-EPS has most significant correlation with the sludge dewaterability and bound water content. In the process of acid-alkali conditioning, the amount and type of organic-functional groups improve obviously and hydrolysis of partly EPS generates organic acids and other small molecules.