不同培养方式下絮状污泥颗粒化特性和灰色关联度分析

Characteristics and gray relational analysis of sludge granulation process under different cultivation strategies

为探索好氧颗粒污泥形成机理,开展了不同培养方式下絮状污泥颗粒化特性研究.选取3种培养方式:人工配水培养、海藻酸钠强化培养和农村模拟污水培养,利用灰色关联分析法,对比3种不同培养方式下,污泥颗粒化过程中各影响因素灰色关联度系数,筛选好氧颗粒污泥培养的关键因素.研究发现,人工配水培养方式下经过40 d成功出现好氧颗粒污泥,投加海藻酸钠强化培养方式下经过20 d出现好氧颗粒污泥,农村模拟污水经过55 d培养出好氧颗粒污泥.3种培养方式下出现的好氧颗粒污泥均具有密实的结构和较好的沉降性能,同时可实现对污染物的高效去除.利用数据处理系统(Data Processing System,DPS)对各影响因素的灰色关联度进行分析,发现不同培养方式下污泥颗粒化过程中起主导作用的影响因素并非唯一,水力停留时间和胞外聚合物在各培养方式中均具有较高的关联度系数,对好氧颗粒污泥的形成具有关键作用.

In order to explore the formation mechanism of aerobic granular sludge（AGS）,the contaminants removal performances and EPS secretion characteristics of AGS under different cultivation strategies were investigated,including AGS cultivated by synthetic wastewater,enhancing sodium alginate and rural domestic sewage.Based on the coefficient of gray relation（GR）,the influence factors in the formation of AGS could be clarified.The experimental results show that the mature AGS were obtained after 40,20 and 55 days by different cultivation strategies,respectively.The granules could all present good settling property and stable structure,as well as high contaminants removal efficiencies.According to the GR analysis by data processing system（DPS）,it could be found that the main influence factors of AGS formation was not unique,the relatively high GR coefficients of hydraulic retention time（HRT） and extracellular polymeric substances（EPS） demonstrated that HRT and EPS acted as the important roles in the formation of AGS.