GUO Bo,TIAN Yu,FAN Chen,et al. Sludge Conditioning by Green Iron Nanoparticles/H2O2 Combined with Amphoteric Dewatering Agent [J].China Water & Wastewater,2020,36(13):62-67.
绿色纳米铁/H2O2联用两性脱水剂调理污泥研究
- Title:
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Sludge Conditioning by Green Iron Nanoparticles/H2O2 Combined with Amphoteric Dewatering Agent
- 摘要:
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针对污水处理厂污泥脱水难度大的问题，采用绿色合成纳米铁(GS-Fe-NPs)/H2O2类芬顿试剂联合两性高分子污泥脱水剂调理污泥。考察了H2O2投加量、初始pH值、温度、反应时间和GS-Fe-NPs投加量对类芬顿氧化调理污泥的影响。结果表明，当污泥初始pH值为6.82（未经调节）、H2O2和GS-Fe--NPs的投加量分别为3.0和1.0 g/L、温度为20 ℃、反应时间为1 h时，离心后污泥含水率可降至70.3%；经调理后污泥上清液中的溶解性化学需氧量（SCOD）、多糖和蛋白质分别增加了8.8、13.2和13.9倍，表明胞外聚合物（EPS）得到了有效破解；相同操作条件下,3个处理系统中羟基自由基(·OH)的相对含量从大到小依次为：GS-Fe-NPs/H2O2>纳米零价铁(nZVI)/H2O2>Fe2+/H2O2，可见GS-Fe-NPs/H2O2体系具有更强的氧化能力。向氧化调理后的污泥中投加脱水剂PADS,可以进一步有效改善污泥的脱水性能。
- Abstract:
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Aiming at the difficult problem of sludge dewatering in wastewater treatment plants, Fenton-like reagent［green synthetic iron nanoparitcles (GS-Fe-NPs)/H2O2］ combined with amphoteric polymer sludge dewatering agent was used to condition the sludge.The influences of?H2O2 dosage, initial pH value, temperature, reaction time and?GS-Fe-NPs dosage on conditioning of sludge by the Fentonlike oxidization were investigated. When sludge initial pH was 6.82 (not adjusted), dosages of?GS-Fe-NPs and?H2O2 were 1.0 g/L and 3.0 g/L, temperature was 20 ℃ and reaction time was 1 hour, the sludge water content could be reduced to 70.3% after centrifugation. At the same time, the soluble COD (SCOD), polysaccharide and protein in the sludge supernatant increased by 8.8, 13.2 and 13.9 times respectively after conditioning, indicating that extracellular polymeric substance (EPS) of the sludge was effectively destroyed. Under the same operational conditions, the relative contents of hydroxyl radical (·OH) in the three treatment systems were measured, and the relative content from large to small wasGS-Fe-NPs/H2O2>nZVI/H2O2>Fe2+/H2O2, suggesting that the system of GS-Fe-NPs/H2O2 had the strongest oxidation capacity. It could further improve the dewatering performance of sludge effectively by adding dewatering agent PADS to the conditioned sludge.
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