污泥调质与机械脱水实验研究

发布时间：2018-09-01 18:49

【摘要】：污泥是污水处理过程中产生的固体废物,污泥调质是改善污泥脱水性能,降低污泥水分的重要方法,对实现污泥的减量化、资源化有重要意义。本论文探讨了污泥调质与机械脱水的主要影响因素,结论如下:采用真空抽滤实验探讨了基于半焦的污泥调质与机械脱水的影响因素,通过污泥比阻测试、扫描电子显微镜(SEM)分析、红外光谱分析(FT-IR)和ζ电位测试分析揭示了基于半焦的污泥调质与机械脱水的机理。实验结果表明:当半焦粒径为75-200μm,添加量为1.5 g半焦·(100 mL)-1污泥(含水率98.49%)时,云南褐煤在500℃下热解的半焦对污泥调质与机械脱水效果较好;经半焦调质污泥的机械脱水泥饼含水率、脱水时间分别由原污泥的76.02%、124 s降低至61.14%、75 s,半焦对污泥调质与机械脱水有显著效果;污泥机械脱水泥饼含水率与半焦质量参数(O/C、H/C、BET比表面积、孔容)呈现良好的相关关系。半焦对污泥调质与机械脱水的机理主要表现在半焦能作为骨架结构显著改善污泥的脱水性能,降低ζ电位的绝对值,消弱污泥的亲水性能以及对污泥的吸附作用。通过真空抽滤实验研究了化学调理剂种类、添加量及化学调理剂混配比对污泥调质与机械脱水效果的影响。对活性污泥,单一絮凝剂PAFC和PAC对污泥调质与机械脱水的效果较好,混配时,用0.03 gPAFC和1 mL CPAM对100 mL污泥(含水率97.08%)进行调质,真空抽滤后污泥的含水率最低,用0.06 gPAC和3 mL CPAM对100 m L污泥(含水率97.08%)进行调质,污泥比阻和抽滤时间最小;对消化污泥,FeCl3对污泥调质与机械脱水的效果最好,用1.2 gFeCl3和5 mLCPAM对100 mL污泥(含水率90.5%)进行调质,真空抽滤污泥的含水率最低,用1.5 gFeCl3和15 mLCPAM对100 mL污泥(含水率90.5%)进行调质,污泥比阻和抽滤时间最小。通过热解和真空抽滤实验,研究了污泥热解产物——污泥活性炭(SSBC)对污泥调质与机械脱水效果的影响,结果表明,污泥活性炭对污泥进行调质不仅能改善污泥机械脱水效果,还能提高污泥热值;对污泥进行调质时,其粒径为75μm以下、添加量为2.0 g·(100 m L)-1污泥时,污泥脱水效果较好;污泥调质与机械脱水对比试验表明,污泥活性炭是一种良好的污泥脱水调理剂。通过对污泥酸碱度、温度的调控,探究了pH、温度对污泥调质与机械脱水效果的影响。结果表明,污泥偏弱酸性时,污泥调质与机械脱水效果更好,随着碱度增大,污泥脱水性能变差,其中,FeCl3对污泥调质与机械脱水效果受pH(pH=6.5~8.5)变化的影响较小;对于半焦和FeCl3,污泥温度越高,污泥调质与机械脱水效果越好,对于PFS,污泥温度为40℃时,其对污泥调质与机械脱水效果相对较好。
[Abstract]:Sludge is a solid waste produced in the process of sewage treatment. Sludge conditioning is an important method to improve sludge dewatering performance and reduce sludge moisture. It is of great significance to realize sludge reduction and reuse. The main influencing factors of sludge conditioning and mechanical dewatering are discussed in this paper. The conclusions are as follows: the influence factors of sludge conditioning and mechanical dewatering based on semi-coke are discussed by vacuum filtration experiment, and the specific resistance of sludge is measured. Scanning electron microscope (SEM) (SEM), infrared spectroscopy (FT-IR) and 味 potential analysis revealed the mechanism of sludge conditioning and mechanical dewatering based on semi-coke. The results showed that when the diameter of char was 75-200 渭 m and the amount of sludge was 1.5g (100 mL) -1 sludge (water content 98.49%), the pyrolysis of Yunnan lignite at 500 鈩，

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