阳离子化克雷伯氏菌絮凝剂CMBF-NIII2在生活污水中的应用
Application of cationic microbial klebsiella flocculant CMBF-NIII2 in sewage treatment
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摘要: 微生物絮凝剂具有无毒性，绿色生产等优点，能够安全地用于给水处理及污废水处理.本文通过阳离子改性和与非生物絮凝剂复配的方法，提高MBF-NⅢ2的絮凝能力.以MBF-NⅢ2为原料，利用3-氯-2-羟丙基三甲基氯化铵（CHTAC）对其修饰，合成新型阳离子化的微生物絮凝剂（CMBF-NⅢ2）以CMBF-NⅢ2为研究主要对象，对校园生活污水进行处理.通过改变投加量、pH值、沉淀时间与温度，探究CMBF-NⅢ2絮凝能力的变化规律.将改性前的MBF-NⅢ2与改性后的CMBF-NⅢ2分别用于校园生活废水的处理，对比发现当CMBF-NⅢ2投加量为1.3 mL，pH 4.6，温度为60℃，沉降时间为40 min时，絮凝率达到91.5%，且COD去除率为87.8%，絮凝能力明显优于MBF-NⅢ2（絮凝率为47.61%），能更高效地絮凝生活污水.以MBF-NⅢ2与三氯化铁复配处理生活污水，结果表明MBF-NⅢ2和FeCl3的投加量分别为10 mg·L-1和15 mg·L-1时，絮凝率可达88.06%，不仅比单独使用MBF-NⅢ2的处理效果好，还相对减少了絮凝剂的投加量.Abstract: The microbial flocculants have the advantage of green production and low toxicity, so they can be safely used in water treatment and sewage wastewater treatment. In this paper, MBF-NⅢ2 was cationized and compounded with inorganic flocculants to enhance their flocculation ability for sewage and waste. By using CHTAC as cationic etherifying agent, the novel cationic microbial klebsiella flocculant CMBF-NⅢ2 is synthesized from MBF-NⅢ2. We want to figure out the law of the CMBF-NⅢ2 flocculation capacity from changing the dosing quantity, pH value, precipitation time and temperature. By orthogonal experiment, get the optimized optimum conditions. In the laboratory, the modified before of MBF-NⅢ2 and the modified after of CMBF-NⅢ2 are used for wastewater treatment in campus, by contrast, found that the CMBF-NⅢ2 flocculation better than the original MBF-NⅢ2. Flocculation rate of CMBF-NⅢ2 is 91.5% and COD removal rate was 87.8%, while MBF-NⅢ2 is only 47.61% on flocculation rate. It is also found that MBF-NⅢ2 compounded with ferric chloride not only has a good flocculation rate on treatment of domestic sewage, but also reduces the dosage of flocculant.
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