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。
The removal of phosphorus（ P） using modified calcium silicate（ MCS） during the anaerobic treatment of livestock wastewater was investigated in this study. Firstly,the adsorption mechanism for of phosphate by MCS was performed according to the theory of precipitation-dissolution. Then the particular size,extracellular polymeric substance（ EPS） contents,and the Zeta potential profile of the anaerobic granular sludge were all compared with or without the addition of MCS to two parallel upflow anaerobic sludge blanket（ UASB） reactors. It was found that the precipitate transformation of MCS for phosphate was strongest,as the equilibrium constant K reached 7. 8 × 10^5. Importantly of note,the removal rate of total phosphorous（ TP） and chemical oxygen demand（ COD） reached 94. 52% and 96. 83%,respectively; EPS content increased by 11%; and the Zeta potential of anaerobic sludge decreased from 19. 8 m V to 3. 6 m V with the addition of MCS. It appeared that not only the size of sludge and the activity of the sludge were enhanced,but the granulation time of sludge was also shortened.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第3期1235-1240,共6页
Chinese Journal of Environmental Engineering
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)
关键词
养殖废水
改性硅酸钙
脱碳除磷
污泥颗粒
Zeta电位
livestock wastewater
modified calcium silicate
carbon and phosphorus removal
sludge parti cles
Zeta potential
