摘要
分别依次投加定量的氯化铁(FeCl_3)、生石灰(CaO)和阳离子聚丙烯酰胺对污水处理厂浓缩池污泥进行调理,通过测试污泥的沉降速率、比阻、粒径、Zeta电位、胞外聚合物和脱水液水质等指标,考察不同脱水药剂对污泥形态和脱水性能的影响。结果表明:FeCl3的混凝作用使污泥颗粒更小更密实;投加CaO能够在污泥内部形成新的矿物相和刚性结构,构建污泥脱水骨架,同时形成的碱性条件使铁离子形成胶体羟基聚合物而强化混凝效果;阳离子聚丙烯酰胺则可以明显增加污泥絮体粒径。污泥紧密结合型胞外聚合物脱落后释放部分束缚水,增强了污泥脱水性能,使污泥脱水效率明显提高。但是采用CaO作为污泥脱水药剂引起的破壁作用可导致脱水滤液水质恶化,大量难降解有机物等污染物回流至污水处理厂会对其正常运行造成不利影响。
FeCl3, CaO and cationic polyacrylamide （CPAM） were respectively tioning of sludge from the thickening tank in a wastewater treatment plant. The effects used for the condi- of different dewate- ring chemicals on sludge morphology and dewatering performance were investigated by measuring sludge settling velocity, specific resistance to filtration, particle size, Zeta potential, extracellular poly- meric substances and dewatering liquor quality. The results showed that FeCl3 could make the sludge par- ticle smaller but denser. Furthermore, new mineral phases and rigid lattice structure for building dewate- ring framework were obtained by the addition of CaO in the sludge conditioning process and the coagula-tion capacity was enhanced by the formation of colloid hydroxyl polymer which was induced due to the al- kaline environment. In addition, the floc particle size significantly increased after the dosage of CPAM. The bound water could be released along with the stripping of tightly bound extracellular polymeric sub- stances （TB-EPS） , and therefore the dewatering performance and efficiencies were improved. However, high strength refractory organics in the sludge filtrate caused by CaO pyrolysis could lead to the unstable operation of wastewater treatment plant.
出处
《中国给水排水》
CAS
CSCD
北大核心
2016年第15期42-47,共6页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2013ZX07315-003)
江苏省政策引导类计划(产学研合作)前瞻性联合研究项目(BY2015019-27)
关键词
污泥
深度脱水
胞外聚合物
难降解有机物
sludge
deep dewatering
extracellular polymeric substances
refractory organics
