武义某电镀废水处理工艺改造及运营管理策略研究

发布时间：2018-06-18 11:27

本文选题：电镀废水 + 工艺改造　；参考：《浙江工商大学》2017年硕士论文

【摘要】：电镀生产线在电镀工艺过程中排放的多种废水中含有剧毒物质如氰化物、各种重金属离子等,如不经过专业环保处理直接排放至自然水体中,必定会对周围环境及所处影响范围的人群产生极大的危害,因此必须严格把控电镀废水处理的达标排放。本文以位于武义某工业区的电镀污水处理站为研究对象,经过工程改造,再一次明确了该电镀废水处理工艺流程:含氰废水添加强氧化剂次氯酸钠两级破氰;综合废水先经次氯酸钠氧化再沉淀;含铬废水添加焦亚硫酸钠化学还原再加碱和絮凝剂进行沉淀分离;镍水先加次氯酸钠反应沉淀分离;四股废水经预处理后再混合,经中间水池-二级反应再分离-三级反应再沉淀的工艺进行处理,改造工程的废水设计处理能力为3000m3/d,实际改造工程总投资约1500万元,药剂成本为6 元/m3,电镀废水经过工程调试运行显示:出水镍指标由原先0.30mg/L下降至0.06mg/L,氰化物指标由原先0.50mg/L下降至0.10mg/L,六价铬指标由原先0.30mg/L下降至0.05mg/L,排放的废水出水镍、铬、氰化物、铜等指标均达到了《GB21900-2008》所规定的污染物表三标准,升级改造后的污泥直接成本每年可节约200万元。通过运营管理,总结出了电镀废水运营的一些关键点,可为其它电镀废水处理站运行管理提供借鉴。
[Abstract]:Many kinds of wastewater discharged from electroplating production line contain highly toxic substances such as cyanide and heavy metal ions, such as discharging directly into natural water without professional environmental protection treatment. It will do great harm to the surrounding environment and the people in the area of influence, so it is necessary to strictly control the discharge of electroplating wastewater. In this paper, the electroplating wastewater treatment station in an industrial area of Wuyi is taken as the research object. After engineering transformation, the treatment process of the electroplating wastewater is confirmed once more: the cyanide containing wastewater is treated by adding strong oxidant sodium hypochlorite to the two-stage cyanide; The synthetic wastewater was oxidized and precipitated by sodium hypochlorite; the chromium-containing wastewater was treated by chemical reduction of sodium pyrosulfite and then by alkali and flocculant for precipitation and separation; nickel water was first added with sodium hypochlorite to precipitate and separated; the four-strand wastewater was pretreated and then mixed. Treated by the process of intermediate tank, secondary reaction and separation, three-stage reaction and reprecipitation, the design capacity of wastewater treatment of the revamping project is 3000 m3 / d, and the total investment of the actual retrofit project is about 15 million yuan. The cost of electroplating wastewater was 6 yuan / m ~ (3). The results showed that the nickel index of effluent decreased from 0.30 mg / L to 0.06 mg / L, the index of cyanide decreased from 0.50 mg / L to 0.10 mg / L, the index of hexavalent chromium decreased from 0.30 mg / L to 0.05 mg / L, and the effluent nickel, chromium, cyanide, The copper and other indexes have reached the standard of pollutant table 3 stipulated in < GB21900-2008 >, and the direct cost of sludge after upgrading and revamping can save 2 million yuan per year. Through operation and management, some key points of electroplating wastewater operation are summarized, which can be used for reference in operation and management of other electroplating wastewater treatment stations.
【学位授予单位】：浙江工商大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X781.1

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