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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。
Modified calcium silicate (MCS) was prepared by chemical precipitation-dispersant to further improve the capability of simultaneous decarbonization and dephosphorization during the anaerobic treatment of aquaculture wastewater. First of all, in this study, the principle of precipitation dissolution was used to analyze the mechanism of phosphorus adsorption in MCS. Then, MCS was added to the anaerobic reaction device. The change of particle size, surface EPS and Zeta potential Oxygen sludge characteristics. The results showed that the precipitation conversion ability of MCS and calcium phosphate was the strongest, the equilibrium constant K was as high as 7.8 × 105, and the adsorption-precipitation reaction was not disturbed by other ions. The MCS was added to the reaction device and the mean particle size And D80 cumulative particle size increase reached 72.46% and 72.97% respectively, the amount of EPS increased about 11%, and the Zeta potential value decreased from -19.8 mV to -3.6 mV. Therefore, adding MCS into the reactor not only increased the pollution Mud particle size, but also shorten the sludge granulation time and enhance the activity of sludge.