不同预处理方法对脱水污泥厌氧消化的影响  

Influence of different pretreatments on anaerobic digestion of dewatered sludge

作　　者：余华平 黄瑛[1] 洪锋[1] 周克梅 周卫东 YU Huaping;HUANG Ying;HONG Feng;ZHOU Kemei;ZHOU Weidong(School of Energy and Environment,Southeast University,Nanjing 210096,China;Nanjing Water Group Co.Ltd.,Nanjing 210002,China)

机构地区：[1]东南大学能源与环境学院,南京210096 [2]南京水务集团有限公司,南京210002

出　　处：《环境工程学报》2018年第9期2594-2601,共8页Chinese Journal of Environmental Engineering

摘　　要：以城市污水厂脱水污泥为对象,研究不同预处理方法(低温水热、HCl、H_2O_2、HCl+低温水热、H_2O_2+低温水热、HCl+低温水热+HAc、H_2O_2+低温水热+HAc)对污泥可溶化率和后续厌氧消化产气的影响。实验结果表明,HCl添加量越大,p H越低;H_2O_2添加量越大,污泥可溶化效果越好。H_2O_2+低温水热+HAc可溶化效果最为显著,经预处理后溶解性化学需氧量(soluble chemical oxygen demand,SCOD)是原泥的13.4倍,溶解性碳水化合物为原泥的4.1倍。可溶化效果与预处理方式均对挥发性脂肪酸(volatile fatty acids,VFA)有影响。预处理条件为HCl+低温水热或H_2O_2+低温水热时,污泥自身VFA含量有较大幅度增加。生物化学甲烷势(biochemical methane potential,BMP)实验显示,甲烷产率提高与产气高峰提前呈正相关;添加HAc可有效提高微生物对污泥的代谢,有利于甲烷产率的提高。预处理条件为H_2O_2+低温水热+HAc时的甲烷产率最大,比原泥甲烷产率提高了57.63%,优于已有研究成果。The influence of different pretreatments（low temperature hydrothermal, HCl, H2O2, HCl＋low temperature hydrothermal, H2O2＋low temperature hydrothermal, HCl＋low temperature hydrothermal＋HAc, H2O2＋low temperature hydrothermal＋HAc） on the sludge dissolubility and methane production during the anaerobic digestion process of the dewatered sludge were investigated. The results showed that higher HCl solution addition with the lower p H, or the higher H2O2 addition leads to the higher sludge dissolubility. The sludge dissolubility under the pretreatment condition of H2O2＋low temperature hydrothermal＋HAc was the highest, while the soluble chemical oxygen demand（SCOD） under this pretreatment condition was 13.4 times than that of the original sludge, and the soluble carbohydrate was 4.15 times than that of the original sludge. Under the pretreatments of both HCl＋low temperature hydrothermal and H2O2＋low temperature hydrothermal, the VFA concentration of the sludge was significantly increased. The biochemical methane potential（BMP） experimental results showed that the increase of the methane yield rate was positively correlated with the earlier shift of the gas production peak. The addition of HAc can effectively improve the microbial metabolism of sludge and increase the methane yield. The methane yield rate under the pretreatment condition of H2O2＋low temperature hydrothermal＋HAc was about 57.63% higher than that of the original sludge not pretreated.

关 键 词：脱水污泥 预处理 可溶化率 挥发性脂肪酸 生物化学甲烷势 

分 类 号：X705[环境科学与工程—环境工程]