The invention belongs to the technical field of wastewater treatment, in particular to a new method for synchronous deep phosphorus and fluorine removal from inorganic wastewater of phosphorus chemical industry. Aiming at the problem that the existing inorganic wastewater treatment methods of phosphorus chemical industry can only deal with the wastewater with simple components and the treatment effect needs to be improved, the present invention provides a new method for simultaneous deep removal of phosphorus and fluorine from inorganic wastewater of phosphorus chemical industry, including the following steps: a, neutralization of wastewater in one stage, pH control range of 4-8; b, supplementation of P, adjustment of P/F to 10-30; c, neutralization of wastewater in two stages, The preparation range is 10-12; 5-20 ppm flocculant is added to the neutralized effluent of d, 2-stage and e, thick separation neutralizing slurry is used to obtain clear liquid and thick slurry respectively. After treatment, the wastewater of the invention has TP < 0.5 ppm and F < 4 ppm, and the effluent index is superior to the first level national comprehensive discharge standard. The filter residue produced in phosphorus and fluorine wastewater treatment process can be used as compound fertilizer additive without secondary pollution. It is suitable for phosphorus and Fluorine Wastewater Treatment in phosphorus chemical industry and is widely used in the industry.
【技术实现步骤摘要】
磷化工无机污水同步深度除磷氟的新方法
本专利技术属于污水处理
,具体涉及一种磷化工无机污水同步深度除磷氟的新方法。
技术介绍
磷化工行业污水主要包括磷石膏渣场渗透水、生产过程的洗涤水或冷凝水、生产过程的滴漏现象导致的工艺水等。在云南、贵州等喀斯特地貌区域,地下水中磷、氟污染严重,P含量可达170ppm~200ppm、F含量可达40ppm~60ppm。磷化工生产区域水质的P指标可高达500ppm~10000ppm。目前磷化工行业执行的是GB8978-1996国家综合排放标准(分1级~3级指标)。随着政府部门对综合水排放监管力度的加大,既对排污企业要求限期治理,也加大了超标处罚的力度。磷化工企业迫切需要寻找一种含磷氟污水的深度脱除工艺,使出水P指标低于0.5ppm,满足综合排放一级执行指标,同时F指标小于10ppm。无机磷化工污水中的磷和氟的去除方法主要有化学沉淀法和吸附法等。化学沉淀法包括石灰中和法和鸟粪石法。申请号为201110229321.5的专利“磷化工污水的处理方法”采用石灰中和法处理钛白粉酸性污水和磷化工污水的混合液,生产磷酸铁、磷酸钙、磷酸铝等沉淀 ...
【技术保护点】
1.磷化工无机污水同步深度除磷氟的新方法,其特征在于,包括如下步骤:a、将磷化工无机污水进行一段中和,pH值调整为4~8;b、一段中和出水补加P,调整P/F至10~30;c、将步骤b得到的污水进行二段中和,pH值调整为10~12;d、二段中和出水,加入5~20ppm絮凝剂;e、将步骤d得到的料浆进行稠厚分离,分别得到清液和稠浆,清液过滤后得到深度除磷氟后的水。
【技术特征摘要】
1.磷化工无机污水同步深度除磷氟的新方法,其特征在于,包括如下步骤:a、将磷化工无机污水进行一段中和,pH值调整为4~8;b、一段中和出水补加P,调整P/F至10~30;c、将步骤b得到的污水进行二段中和,pH值调整为10~12;d、二段中和出水,加入5~20ppm絮凝剂;e、将步骤d得到的料浆进行稠厚分离,分别得到清液和稠浆,清液过滤后得到深度除磷氟后的水。2.根据权利要求1所述的磷化工无机污水同步深度除磷氟的新方法,其特征在于:步骤a所述磷化工无机污水是指P含量≥1ppm、F含量为≥10ppm的污水。3.根据权利要求1所述的磷化工无机污水同步深度除磷氟的新方法,其特征在于:步骤a所述磷化工无机污水中还包括SiF62-或AlF63-中的至少一种。4.根据权利要求1所述的...
【专利技术属性】
技术研发人员:曾春华,李剑秋,邓强,黄其兵,黎宇,姚汉景,
申请(专利权)人:贵州川恒化工股份有限公司,
类型:发明
国别省市:贵州,52
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