基于碳源回用目标的剩余污泥水解酸化产物调控研究  

Study on the Products Regulation of Waste Activated Sludge Hydrolytic Acidification Based on Carbon Source Recycling

作　　者：李平[1,2,3] 朱凤霞[1,2,3] 王丽苹[1,2,3] 王苏女 于可可 吴锦华[1,2,3] 胡勇有[1,2,3] 

机构地区：[1]华南理工大学环境与能源学院工业聚集区污染控制与生态修复教育部重点实验室,广东广州510006 [2]华南理工大学污染控制与生态修复广东省普通高等学校重点实验室,广东广州510006 [3]华南理工大学固体废物处理与资源化广东省环境保护重点实验室,广东广州510006

出　　处：《生态环境学报》2017年第4期676-680,共5页Ecology and Environmental Sciences

基　　金：广州市科技计划项目(2014Y2-00522);广东省应用型科技研发专项资金项目(2016B020240005);广州市产学研协同创新重大专项(201604020055)

摘　　要：剩余污泥水解酸化产生的挥发性脂肪酸(VFAs)等有机物可作为补充碳源回用于低C/N比城市污水脱氮除磷系统中。然而,在污泥水解酸化过程中由于甲烷菌等微生物的作用而难以实现水解酸化产物的有效积累。同时,含有高浓度氮磷的污泥水解酸化液直接回用将进一步增加污水处理的氮磷负荷。本研究基于碳源回用目标,在热碱预处理的基础上,采用添加二溴乙烷磺酸钠(BES,2-Bromoethanesulfonic acid sodium)和Ca O2的方式对城市污水厂剩余污泥水解酸化过程的主要产物即溶解性有机物(SCOD)、VFAs及氮磷的溶出进行优化调控,旨在得到含有高浓度有机物、低浓度氮磷的污泥水解酸化液以回用于低C/N比城市污水脱氮除磷系统,提高出水水质,为剩余污泥的资源化利用提供理论依据。结果表明,污泥经Na OH预处理后,添加BES可有效提高水解酸化过程SCOD、VFAs的积累,其最高质量浓度分别达到6 169.8 mg·L^(-1)及1 335.0 mg·L^(-1),较对照组分别提高66.7%、192.5%,其中,VFAs中乙酸的质量分数达到66.0%。添加CaO_2的实验组酸化液中,NH4_+^-N和PO_4~3--P的溶出量显著降低,分别降至200.7 mg·L^(-1)、9.6 mg·L^(-1),较对照组分别减少了59.6%、65.7%。同时添加BES和CaO_2的组合体系在实现污泥水解酸化过程SCOD、VFAs累积的同时有效降低了氨氮和正磷酸盐的溶出,所获取的剩余污泥水解酸化产物可作为低C/N比城市污水脱氮除磷提标升级的优质碳源,实现了剩余污泥的资源化回用。Products of waste activated sludge （WAS） hydrolytic acidification such as volatile fatty acids （VFAs） can be used as supplementary carbon sources for treatment of municipal wastewater with a low C/N ratio. However, it is difficult to accumulate sufficient VFAs and other useful carbon source products from WAS hydrolytic acidification due to methanogenesis. In addition, the extremely high nitrogen and phosphorus contents in the recycling liquid from the hydrolytic acidification process further increases the nitrogen and phosphorus load of municipal wastewater treatment plant （WWTP）. Based on the carbon source recycling target, BES （2-Bromoethanesulfonic acid sodium） and CaO2 were added to WAS hydrolytic acidification process to investigate the accumulation of SCOD and VFAs, as well as the decrease of nitrogen and phosphorus. The results showed that after NaOH hot-alkali pretreatment, the addition of BES can improve the accumulation of SCOD and VFAs efficiently at the WAS hydrolytic acidification process, the maximum mass concentrations of SCOD and VFAs were 6169.8 mg·L-1and 1335.0 mg·L-1, which were 66.7% and 195.2% higher respectively than that of the control. Acetic acid mass fractions in VFAs reached to 66.0%. Compared with the control, the removal rates of nitrogen and phosphorus were reduced by 59.6% and 65.7% respectively when CaO2 was added, and the final mass concentrations were only 200.7 mg·L-1, 9.6 mg·L-1 in reactors. Combination of BES and CaO2 can effectively promote the accumulation of SCOD and VFAs and the reduction of nitrogen and phosphorous at the WAS hydrolytic acidification process. The products of WAS hydrolytic acidification can be used as carbon source for treatment of municipal wastewater denitrification and phosphorus removal system with a low C/N ratio and to realize sludge recycling.

关 键 词：剩余污泥 水解酸化 挥发性脂肪酸 产物调控 资源化利用 

分 类 号：X705[环境科学与工程—环境工程]