高稳定活性硅酸SPSA在污泥脱水应用中的研究

Application of Stabilized Polysilicic Acid(SPSA)in Sludge Dewatering

摘要: 以NaO·3．2SiO₂、H₂SO₄和Al₂(SO₄)₃为原料，制备出高稳定活性硅酸絮凝剂SPSA，研究了它在污泥脱水应用中的絮凝特性。实验结果表明，向生化处理产生的剩余活性污泥中投加相对于污泥量2．0％的SPSA，在5×10⁴Pa真空度下过滤脱水，污泥含水率由99．4％下降为70．0％，污泥体积降为原体积的1／50，燃烧热值增大50倍，污泥比阻下降，并且所得滤液澄清，透光率高。

Abstract: Stabilized Polysilicic Acid(SPSA)has been prepared by using NaO·3.2SiO2,H2SO4 andAl2(SO4)3.The flocculation property of SPSA in sludge dewatering was studied.The experimentalresults showed that after filtered at the vacuum of 5(10⁴ Pa,the water ratio of sludge was decreasedfrom 99.4%to 70.0%,the sludge volume reduced to 1/50,its calorific value increased by 50 times,its specific resistance reduced obviously and the filter liquor was clarified when 2.0%SPSA with respect to the weight of dried sludge was added to the sludge taken from the sewage treatment work.