首页> 中文期刊>哈尔滨商业大学学报(自然科学版) >不同活性污泥中污泥质量浓度对沉降性的影响

不同活性污泥中污泥质量浓度对沉降性的影响

     

摘要

为了考察污泥质量浓度对活性污泥沉降性的影响,采用100 mL量筒进行批沉降试验,分别研究了不膨胀污泥、丝状菌膨胀污泥和非丝状菌膨胀污泥在不同质量浓度下的沉降性能.结果表明,当质量浓度过低时,所有污泥都具有沉速快,泥水分界面模糊,沉后上清液浑浊的特性.当质量浓度升高时,沉速都会减慢,且泥水分界面分别因拥挤沉淀(不膨胀污泥)和交联分离(膨胀污泥)作用而变得清晰.当用污泥沉降比(SV)来表征沉降性时,不膨胀污泥对质量浓度变化敏感,而膨胀污泥则一直保持在90%以上.当用污泥容积指数(SVI)来表征沉降性时,对不膨胀污泥取沉降60 min的SVI可消除质量浓度的影响.对膨胀污泥需要设定一个特定质量浓度下的标准值,其他质量浓度下的SVI按照反比例关系换算到该质量浓度下再进行比较.%In order to investigate the impacts of mixed liquor suspended solids ( MLSS) concentration on sludge settleability, batch settling tests were carried out by 100 Ml cylinders. The sludge settleability under different MLSS in non-bulking sludge, filamentous bulking sludge and non-filamentous bulking sludge dere investigated. The results show that, when MLSS was thin, all kinds of sludge had the characteristics of quick settling rate, fuzzy solid/ liquid interface and tubid supernatant. When MLSS was dense, the settling speed would decrease. Meanwhile, the solid/liquid interface was changing clearer by the hindered settling (non-bulking sludge) and crosslinked separation (bulking sludge) , respectively. When SV was used to describe sludge settleability, it was very sensitive to MLSS in non-bulking sludge, while it kept above 90% all the time in bulking sludge. When SVI was used to describe sludge settleability, the impacts of MLSS can be eliminated by calculating after settling 60 mins in non-bulking sludge. In bulking sludge, a standard SVI value under a certain MLSS should be set, the SVI under other MLSS could be conversed to the value under this MLSS according to inversely proportional relationship to compare sludge settleability.

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