水稻秸秆制备微生物絮凝剂及改善污泥脱水性能的研究

发布时间：2018-01-07 01:20

本文关键词：水稻秸秆制备微生物絮凝剂及改善污泥脱水性能的研究　出处：《中国环境科学》2016年11期 　论文类型：期刊论文

【摘要】：采用水稻秸秆制备微生物絮凝剂,研究了微生物絮凝剂对污泥脱水性能的影响,并通过响应面分析法优化了微生物絮凝剂与聚合氯化铝(Polyaluminum chloride,PAC)复配改善污泥脱水性能的过程.结果表明,制备微生物絮凝剂的最佳条件为:800mL蒸馏水、200mL水稻秸秆酸解液、4g K_2HPO_4、2g KH_2PO_4、0.2g MgSO_4、0.1g NaCl、2g尿素,在此条件下,微生物絮凝剂产量达0.96g/L.保持原污泥pH值,当微生物絮凝剂投加量为12mg/L,干污泥量(DS)较原污泥提高了59.5%,污泥比阻(SRF)降低了53.6%,表明经微生物絮凝剂絮凝处理,污泥脱水性能显著改善.保持原污泥pH值,当PAC投加量为3g/L,干污泥量(DS)为16.4%,高于原污泥的13.2%,污泥比阻为(SRF)5.4×1012m/kg,低于原污泥的11.3×10~12m/kg,说明PAC对污泥脱水性能有着明显的改善作用.响应面分析结果显示,污泥脱水最佳条件为微生物絮凝剂8.1mg/L、PAC 1.9g/L、pH值8.0,相应DS和SRF分别为24.1%和3.0×10~12m/kg.实际污泥脱水工程中,污泥pH往往不进行调节,保持原污泥pH=6.4条件下,DS和SRF分别为23.6%和3.2×10~12m/kg,均优于单独采用微生物絮凝剂和PAC时的污泥脱水效果.
[Abstract]:The effect of microbial flocculant on sludge dewatering was studied by using rice straw to prepare microbial flocculant. The process of microbial flocculant and polyaluminum chloride PAC was optimized by response surface analysis. The results showed that the process of sludge dewatering was improved. The optimum conditions for the preparation of microbial flocculant were as follows: 200 mL distilled water containing 200 mL of rice straw acidolysis solution, 4 g K2HPO 4g KH_2PO_4. 0.2g MgSO40.1g NaCl-2g urea. Under these conditions, the microbial flocculant yield reached 0.96g / L, and the pH value of raw sludge was maintained. When the dosage of microbial flocculant was 12 mg / L, the amount of dry sludge increased by 59.5% and the specific resistance of sludge decreased by 53.6% as compared with the original sludge. The results showed that the sludge dewatering performance was significantly improved by microbial flocculant flocculation, and the pH value of the original sludge was maintained. When the dosage of PAC was 3 g / L, the amount of dry sludge was 16.4%. The specific resistance of the sludge was 5.4 脳 1012m/ kg, which was lower than that of the original sludge (11.3 脳 1012m/ kg). The results of response surface analysis showed that the optimal condition of sludge dewatering was as follows: microbial flocculant 8.1 mg / L ~ (-1) g 路L ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1) 路L ~ (-1). The pH value of sludge is 8.0, the corresponding DS and SRF are 24.1% and 3.0 脳 10 ~ (10) ~ (12) m / kg, respectively. In the actual sludge dewatering project, the sludge pH is often not regulated. Under the condition of maintaining the original sludge pH=6.4, DS and SRF were 23.6% and 3.2 脳 10 ~ (10) ~ (12) mg 路kg ~ (-1), respectively, which were better than the sludge dewatering effect when using microbial flocculant and PAC alone.
【作者单位】：成都信息工程大学资源环境学院;
【分类号】：X703.1
【正文快照】： 污水处理厂常用的污泥脱水调理剂聚合氯化铝(Polyaluminum chloride,PAC)和聚丙烯酰胺(Polyacrylamide,PAM),具有污泥处理效果好、成本较低等优点,但其长期使用不仅会导致污泥中重金属富集,而且易在污泥中引入剧毒的丙烯酰胺单体,对污泥后续处置造成很大的压力[1].微生物絮

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