改性蛭石絮凝剂对养殖废水的应用研究
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摘要
以传统PFS作为参考,研究了改性蛭石无机矿物材料絮凝剂对养殖废水中磷、SS、浊度、COD和TN去除效果,蛭石絮凝剂絮体的沉降速度以及絮凝沉降物中磷的解吸率。由试验可知:改性蛭石絮凝剂对养殖废水中磷的去除率为95.8%,对SS、浊度、COD、TN去除效果分别为95.7%、70.0%、38.8%和21.9%,其效果几乎与PFS相同。但是蛭石絮凝剂的絮体体积只占整个沉降物体积的26.4%,而PFS的絮体体积则高达66.4%,是蛭石絮凝剂絮体体积的2.5倍,分离效果较差。蛭石絮凝剂的上清液和絮体沉降物中重金属含量均在标准范围内,而且絮体沉降物中磷在酸性条件下具有较好的解吸率,是一种高效无毒的絮凝剂。
Compared with traditional PFS,the removal efficiencies of phosphorus,SS,turbidity,COD and ammonia by modified vermiculite flocculant were studied. The sedimentation efficiency of vermiculite flocculant and the phosphorus desorption efficiency of flocculation sediment were investigated. It was found that the removal efficiency of phosphorus for swine wastewater was 95. 8%,and the removal rates of SS,turbidity,COD and TN were 95. 7%,70. 0%,38. 8%,21. 9%,respectively,which were comparable to PFS. However,the floc volume of vermiculite flocculant accounted for only 26. 4% of the whole floc sediment volume,while the floc volume of PFS was as high as 66. 4%,showing poor separation behavior. The contents of heavy metals in the supernatant and floc sediment of vermiculite flocculant were within the standard range.Moreover,phosphorus in floc sediment had a good desorption efficiency under acidic condition,which was an excellent nontoxic flocculant.
Compared with traditional PFS,the removal efficiencies of phosphorus,SS,turbidity,COD and ammonia by modified vermiculite flocculant were studied. The sedimentation efficiency of vermiculite flocculant and the phosphorus desorption efficiency of flocculation sediment were investigated. It was found that the removal efficiency of phosphorus for swine wastewater was 95. 8%,and the removal rates of SS,turbidity,COD and TN were 95. 7%,70. 0%,38. 8%,21. 9%,respectively,which were comparable to PFS. However,the floc volume of vermiculite flocculant accounted for only 26. 4% of the whole floc sediment volume,while the floc volume of PFS was as high as 66. 4%,showing poor separation behavior. The contents of heavy metals in the supernatant and floc sediment of vermiculite flocculant were within the standard range.Moreover,phosphorus in floc sediment had a good desorption efficiency under acidic condition,which was an excellent nontoxic flocculant.
引文
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[10]Okano K,Yamamoto Y,Takano H,et al.A simple technology for phosphorus recovery using acid-treated concrete sludge[J].Separation&Purification Technology,2016,165:173-178.
[2]王亮,陈重军,陈英旭,等.规模化猪场养殖废水UASBSFSBR-MAP处理工艺中试研究[J].环境科学,2013,34(3):979-985.
[3]吴少涛.规模化猪场养殖废水处理模式浅析[J].广东化工,2017,44(3):130-131.
[4]陈思远.某养猪场废水处理生化处理系统工程设计[J].科技与创新,2017(3):111-112.
[5]韩伟铖,颜成,周立祥.规模化猪场废水常规生化处理的效果及原因剖析[J].农业环境科学学报,2017,36(5):989-995.
[6]田怀凤,徐田,高威,等.猪场处理废水施用对机插水稻产量形成和氮素利用的影响[J].中国土壤与肥料,2017(2):120-125.
[7]吴飞龙,叶美锋,吴晓梅,等.添加菌糠对猪粪渣堆肥过程及氨排放的影响[J].农业环境科学学报,2017,36(3):598-604.
[8]魏锦程,高宝玉,王燕,等.聚合铁复合絮凝剂用于城镇纳污河河水化学强化处理的性能及机理研究[J].精细化工,2008,25:154-158.
[9]王昶,林鹏,豆宝娟,等.黏土矿物为原料絮凝剂的制备及应用研究[J].天津科技大学学报,2015,30(1):62-66.
[10]Okano K,Yamamoto Y,Takano H,et al.A simple technology for phosphorus recovery using acid-treated concrete sludge[J].Separation&Purification Technology,2016,165:173-178.