摘要
绍兴市工业园区某污水处理厂二期工程接收的主要是印染废水,以及部分酸性化工废水。由于化工废水的pH低,成分复杂,色度高,可生化性差,对生物处理系统冲击较大,为此,开展了催化铁内电解法处理酸性化工废水,出水与印染废水混合后进行混凝的研究。结果表明,pH是影响催化铁内电解体系对化工废水pH的调节能力、Fe2+产生浓度、COD去除率以及B/C的主要因素。催化铁内电解法处理酸性化工废水2 h后反应出水的铁离子质量浓度在800～2 500 mg/L,将其与印染废水混合后进行混凝,混凝的最适反应条件为pH≥8,Fe2+质量浓度120 mg/L。其处理效果与投加亚铁盐混凝相当,既充分利用了催化铁预处理所产生的高浓度铁离子,并且提高了化工废水的B/C,减小了其所含难降解污染物对生化系统的不利影响,又减少了碱的用量,同时亦实现了化工与印染废水的综合预处理。
Shaoxin Industrial Park sewage treatment plant phase Ⅱ received mostly printing and dyeing wastewater, as well as some acidic wastewater, the low pH, complex components, high chroma, poor biodegradability of the chemical wastewater led to a strong impact on the biological treatment system, therefore, research of catalyzed iron internal electrolysis process acidic chemical wastewater, effluent water mixed with printing and dyeing wastewater and coagulation was carried out. The results showed that： pH was the main factor that influence of catalyzed iron internal electrolysis method for treating chemical industry wastewater in pH regulation ability, Fe2＋ concentration, the removal rate of COD and B/C. The acidic chemical wastewater treated by catalyzed iron intemal electrolysis for 2 h,concentration of iron ions was 800 -2 500 mg/L, mixed it with printing and dyeing wastewater and coagulation, the optimum reaction conditions were pH≥ 8, Fev concentration 120 mg/L. The treatment effect was the same compared with adding ferric coagulation, It can make full use of high concentration of iron ion produced by catalyzed iron pretreated, improved B/C of the chemical wastewater, reducing its adverse effects of biochemical systems brought by refractory pollutants, reduced the amount of alkali used, and achieved the chemical printing and dyeing wastewater comprehensive pretreatment.
出处
《水处理技术》
CAS
CSCD
北大核心
2012年第9期88-92,共5页
Technology of Water Treatment
基金
国家高技术研究发展863计(2009AA063902)
上海市科委长三角四省市合作项目(10195811400)
关键词
化工废水
印染废水
催化铁内电解
混凝
acidic wastewater
printing and dyeing wastewater
catalyzed iron internal electrolysis
coagulation
