改性硅酸钙对养殖废水厌氧除磷过程中污泥特性的影响
发布时间：2018-11-20 08:51
【摘要】：采用化学沉淀-分散剂法制备改性硅酸钙(modified calcium silicate,MCS),以进一步提高养殖废水厌氧处理过程中同步脱碳除磷能力。首先,本研究采用沉淀溶解理论解析MCS磷吸附特性机理,再将MCS投加到厌氧反应装置中,并通过测定污泥的颗粒粒径、表面EPS和Zeta电位变化,以深入探讨MCS对厌氧污泥特性的影响。结果表明:MCS与磷酸钙的沉淀转化能力最强,平衡常数K值高达7.8×105,而且发生的吸附沉淀反应不受其他离子的干扰;MCS投加到反应装置中,污泥颗粒平均粒径和D80累计粒径增幅分别达到72.46%和72.97%、EPS量增加了约11%、Zeta电位值由-19.8 m V降到了-3.6 m V,因此MCS投加到反应器中不仅增大了污泥的颗粒粒径,还可缩短了污泥颗粒化的时间并增强污泥的活性。
[Abstract]:Modified calcium silicate (modified calcium silicate,MCS) was prepared by chemical precipitation-dispersant method in order to further improve the ability of simultaneous decarbonization and phosphorus removal in anaerobic treatment of aquaculture wastewater. Firstly, the mechanism of phosphorus adsorption of MCS was analyzed by precipitation dissolution theory, and then MCS was added to the anaerobic reactor. The particle size of sludge, the change of surface EPS and Zeta potential were measured. The effect of MCS on anaerobic sludge was studied. The results show that the precipitation and transformation ability of MCS and calcium phosphate is the strongest, the equilibrium constant K is up to 7.8 脳 10 ~ 5, and the adsorption precipitation reaction is not interfered by other ions. When MCS was added to the reactor, the average particle size of sludge and the cumulative diameter of D80 increased by 72.46% and 72.97%, respectively, and the Zeta potential decreased from -19.8 MV to -3.6 MV, respectively. Therefore, the addition of MCS to the reactor not only increased the particle size of sludge, but also shortened the time of sludge granulation and enhanced the activity of sludge.
【作者单位】： 江南大学环境与土木工程学院;无锡市锡山区环境保护局;江苏省水处理技术与材料协同创新中心;
【基金】：江苏省自然科学基金资助项目(BK2012558) 江苏省高校科研成果产业化项目(JHB2011-29) 科技部水体污染控制与治理科技重大项目(2011ZX07301-002)
【分类号】：X713
[Abstract]:Modified calcium silicate (modified calcium silicate,MCS) was prepared by chemical precipitation-dispersant method in order to further improve the ability of simultaneous decarbonization and phosphorus removal in anaerobic treatment of aquaculture wastewater. Firstly, the mechanism of phosphorus adsorption of MCS was analyzed by precipitation dissolution theory, and then MCS was added to the anaerobic reactor. The particle size of sludge, the change of surface EPS and Zeta potential were measured. The effect of MCS on anaerobic sludge was studied. The results show that the precipitation and transformation ability of MCS and calcium phosphate is the strongest, the equilibrium constant K is up to 7.8 脳 10 ~ 5, and the adsorption precipitation reaction is not interfered by other ions. When MCS was added to the reactor, the average particle size of sludge and the cumulative diameter of D80 increased by 72.46% and 72.97%, respectively, and the Zeta potential decreased from -19.8 MV to -3.6 MV, respectively. Therefore, the addition of MCS to the reactor not only increased the particle size of sludge, but also shortened the time of sludge granulation and enhanced the activity of sludge.
【作者单位】： 江南大学环境与土木工程学院;无锡市锡山区环境保护局;江苏省水处理技术与材料协同创新中心;
【基金】：江苏省自然科学基金资助项目(BK2012558) 江苏省高校科研成果产业化项目(JHB2011-29) 科技部水体污染控制与治理科技重大项目(2011ZX07301-002)
【分类号】：X713
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