屠宰废水制备微生物絮凝剂及改善污泥脱水性能的研究

发布时间：2018-03-25 12:53

本文选题：微生物絮凝剂　切入点：聚合氯化铝　出处：《中国环境科学》2017年07期

【摘要】：选取红平红球菌利用屠宰废水生产微生物絮凝剂,以化学调理剂为对比,研究了微生物絮凝剂作用于污泥的脱水效果,并通过响应面分析法(RSM),对聚合氯化铝(PAC)与红平红球菌生产的微生物絮凝剂复配改善污泥脱水性能的过程进行了优化.结果表明,在最佳投加量12g/(kgDS)和pH值7.5条件下,经过微生物絮凝剂调理后,干污泥含量(DS)和污泥比阻(SRF)分别达到19.8%和4.6×10~(12)m/kg,明显优于Al_3(SO_4)_2和FeCl_3作为调理剂时的污泥脱水效果,略劣于PAC和PAM,其中PAC作为污泥调理剂时,DS和SRF分别达到20.1%和4.5×10~(12)m/kg.响应面实验设定的响应值分别为DS和SRF,所拟合的关于DS和SRF的二次模型决定系数(R2)分别为0.9545和0.9776,表明拟合情况良好.根据响应值的分布情况,确定污泥脱水的最佳条件为微生物絮凝剂10.5g/(kgDS)、PAC12.4g/(kgDS)、pH值7.5,相应DS和SRF分别为24.1%和3.0×10~(12)m/kg.实际工程中,污泥脱水过程的pH值往往不进行调节,在保持原污泥pH值6.4条件下,DS和SRF分别为23.6%和3.2×10~(12)m/kg,污泥脱水效果较单独采用微生物絮凝剂或PAC时得到了明显的提高.
[Abstract]:The effect of microbial flocculant produced by Rhodococcus Hongpingensis on sludge dewatering was studied with chemical conditioning agent as contrast, and the microbial flocculant was used to produce microbial flocculant from slaughterhouse wastewater. By means of response surface analysis (RSM), the process of improving sludge dewatering performance was optimized by mixing the microbial flocculants produced by polyaluminum chloride (PAC) and Rhodococcus rubrum. The results showed that under the optimum dosage of 12g / kg DSs and pH 7.5, the process of sludge dewatering was improved. After treatment with microbial flocculant, the dry sludge content (DSs) and sludge specific resistance (SRF) reached 19.8% and 4.6 脳 10 ~ (-1) ~ (12) m / kg, respectively, which were superior to those of Al_3(SO_4)_2 and FeCl_3 as conditioning agents for sludge dewatering. It was slightly worse than PAC and pam, where PAC and SRF reached 20.1% and 4.5 脳 10 ~ (-1) m / kg respectively. The response surface experiments set response values of DS and SRF, respectively. The fitted quadratic model decision coefficients (R2) for DS and SRF were 0.9545 and 0.9776, respectively. According to the distribution of response value, The optimum conditions for sludge dewatering were determined as follows: microbial flocculant PAC12.4g / kg DSN pH 7.5, corresponding DS and SRF 24.1% and 3.0 脳 10 ~ 0 ~ 12m / kg 路kg ~ (-1) respectively. In practical projects, the pH value of sludge dewatering process is often not regulated. Under the condition of maintaining pH value of raw sludge, DS and SRF were 23.6% and 3.2 脳 10 ~ (-1) ~ (12) mg 路kg ~ (-1), respectively. The dewatering effect of sludge was obviously improved compared with that of using microbial flocculant or PAC alone.
【作者单位】：成都信息工程大学资源环境学院;
【基金】：国家自然科学基金资助(51508043) 四川省科技计划项目(2016JY0015) 四川省教育厅科研项目资助(15ZB0178) 成都市科技局科技惠民技术研发项目(2015-HM01-00149-SF) 成都信息工程大学中青年学术带头人科研人才基金资助(J201515)
【分类号】：X703

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