生物絮凝剂制备及其对草浆造纸废水深度处理

发布时间：2018-02-11 07:05

本文关键词： 生物絮凝剂剩余污泥草浆造纸废水色度去除　出处：《大连理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：造纸工业新鲜水消耗量大、产生污染严重。尤其是草浆造纸废水COD和色度都高,通过常规的二级生物处理难以去除,而且在处理过程中产生大量剩余污泥。草浆造纸行业清洁生产要求减少吨纸新鲜水消耗和污染物排放量,废水的深度处理与回用及对剩余污泥资源化利用是解决这一问题的有效手段。本文以草浆造纸废水生化处理产生的剩余污泥为原料,制备生物絮凝剂(Papermaking sludge bioflocculant, PSBF),研究了PSBF的制备方法、絮凝条件、应用效果、性质和组分以及絮凝机理。结果表明,在超声波处理、热处理、碱水解和碱-超声联合处理四种方法中,碱解法是水解污泥制备PSBF的最佳方法,最佳碱投加量为2.25 g/g TS。PSBF在pH=11,用量为1 mL.L-1,助凝剂用量为110 mL.L-1条件下絮凝效果最佳。中试试验运行结果表明,PSBF对草浆造纸废水的COD和色度去除率平均保持在68%和85%。红外谱图分析等试验结果显示,PSBF的主要絮凝成分为多糖,具有良好的储存稳定性和热稳定性,絮凝机理符合离子键结合及吸附架桥理论。本文研究结果为草浆造纸废水有效去除色度以及草浆造纸行业的污泥原位资源化利用提供了理论和技术参考。
[Abstract]:The waste of fresh water in papermaking industry is large and the pollution is serious, especially the COD and chroma of straw pulp and papermaking wastewater are high, so it is difficult to remove them by conventional secondary biological treatment. In addition, a large amount of excess sludge is produced during the treatment process. Clean production in the straw pulp and paper industry requires reducing the consumption of fresh water and the discharge of pollutants from tons of paper. Advanced treatment and reuse of waste water and utilization of surplus sludge are effective means to solve this problem. In this paper, the waste sludge produced by biochemical treatment of straw pulp and papermaking wastewater is used as raw material. The preparation of sludge bioflocculant (PSBF) was prepared. The preparation method, flocculation conditions, application effect, properties, composition and flocculating mechanism of PSBF were studied. The results showed that, in the four methods of ultrasonic treatment, heat treatment, alkaline hydrolysis and alkaline ultrasonic treatment, Alkaline hydrolysis is the best method for the preparation of PSBF from hydrolyzed sludge. The optimum dosage of alkali was 2.25 g / g TS.PSBF at pH 11, dosage of 1 ml 路L -1 and dosage of coagulant 110 mL.L-1. The results of pilot test showed that the average removal rate of COD and chromaticity of straw pulp wastewater was 68% and 85% respectively. The main flocculating component of PSBF was polysaccharide. With good storage stability and thermal stability, The flocculation mechanism is in accordance with the theory of ionic bond binding and adsorption bridging. The results provide theoretical and technical references for the effective removal of chroma from straw pulp and papermaking wastewater and the in-situ utilization of sludge in the pulp and paper industry.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X793

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