混凝法预处理鱼子加工废水的研究

发布时间：2018-02-28 23:02

本文关键词： 鱼子加工废水混凝去除率正交试验　出处：《青岛理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：鱼子加工废水水质特点不同于一般的水产品加工废水,该废水有机物、氮磷以及盐度含量较高。废水直接进行生化处理时容易在生化池内产生大量的泡沫,并且容易出现出水氨氮升高的现象。废水的盐度较高,不仅增加了微生物的驯化难度而且还降低了生化处理的效果。在实际生产中直接采用生化法处理时出水水质不易达标。针对以上问题,应强化鱼子加工废水的预处理。为解决直接生化处理时存在的问题,使废水达标排放,论文研究了混凝法对鱼子加工废水的处理效果。论文采用了聚合氯化铝、硫酸铝、氯化铁、聚合硫酸铁四种混凝剂对青岛某水产品加工厂产生的鱼子加工废水进行预处理。探讨了每种混凝剂的最佳pH值及投加量,分析了混凝法对COD、总磷、无机磷的去除效果,对比混凝效果确定最佳混凝剂。通过对最佳混凝剂进行正交试验确定各影响因素的主次关系,以及混凝的最佳条件。研究结果表明,采用氯化铁对其进行混凝处理的效果最好,其最佳pH值为7,最佳投加量为660mg/L,此时COD、总磷、无机磷的去除率分别为59.3%、97.7%、97.5%。氯化铁与论文所采用的其他混凝剂相比,具有处理效果好、药剂成本低的优点。使用氯化铁后出水中残留的铁能维持后续生化处理中微生物的正常生命活动,这一点是使用铝盐混凝剂所无法比拟的。根据正交试验结果,影响鱼子加工废水混凝处理的各因素主次关系依次为:搅拌方式、氯化铁投加量、pH值、沉淀时间。混凝的最佳条件为:氯化铁投加量为660mg/L,pH值为7,搅拌方式为快速搅拌1min,转速为120r/min,慢速搅拌15min,转速为80r/min,沉淀时间为30min。混凝法对鱼子加工废水中COD和磷的去除效果较好,是一种高效的前处理工艺。本论文的研究结果为混凝法预处理鱼子加工废水在实际生产中的应用提供了参考依据。
[Abstract]:The water quality of fish processing wastewater is different from that of aquatic product processing wastewater. The organic matter, nitrogen, phosphorus and salinity of the wastewater are high. When the wastewater is treated directly by biochemical treatment, a large amount of foam is easily produced in the biochemical tank. And it is easy to appear the phenomenon of ammonia nitrogen rising in effluent. The salinity of wastewater is high, It not only increases the difficulty of microbial acclimation, but also reduces the effect of biochemical treatment. The pretreatment of fish seed processing wastewater should be strengthened. In order to solve the problems existing in direct biochemical treatment and make the wastewater discharge up to standard, the paper studied the effect of coagulation on the treatment of fish seed processing wastewater. Four coagulants, ferric chloride and polyferric sulfate, were used to pretreat fish seed processing wastewater from a aquatic product processing plant in Qingdao. The optimum pH value and dosage of each coagulant were discussed, and the removal efficiency of COD, total phosphorus and inorganic phosphorus by coagulation method was analyzed. The optimum coagulant was determined by comparing the coagulation effect. The primary and secondary relationship of each influencing factor and the optimum coagulation conditions were determined by orthogonal test. The results showed that ferric chloride was the best coagulant for coagulating the coagulant. The optimum pH value is 7, the optimal dosage is 660 mg / L, and the removal rates of COD, TP and inorganic phosphorus are 59.3% and 97.7% respectively. Compared with the other coagulants used in the paper, ferric chloride has a good treatment effect. The advantage of low cost of the reagent. Iron residues in the effluent after the use of ferric chloride can maintain the normal life activity of microbes in subsequent biochemical treatment, which is incomparable to the use of aluminum salt coagulants. According to the results of the orthogonal test, The main and secondary relationships of the factors affecting the coagulation treatment of fish processing wastewater are as follows: mixing mode, adding amount of ferric chloride and pH value. The optimum conditions of coagulation were as follows: the dosage of ferric chloride was 660mg / L ~ (-1) pH value, the speed of stirring was 120 r / min, the speed of stirring was 120 r / min, the speed of stirring was 15 min, the rotational speed was 80 r / min, and the sedimentation time was 30 min. The removal of COD and phosphorus in fish processing wastewater by coagulation method was better. The results of this paper provide a reference for the application of coagulation pretreatment of fish seed processing wastewater in practical production.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X792

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