皮革工业园区废水处理研究

发布时间：2018-02-11 04:03

  本文关键词： 皮革废水 氨氮吹脱 Fenton氧化　出处：《北京理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：目前,我国是世界上最大的皮革制造国家,皮革行业产生的废水水量大,波动性强,成分复杂,含有大量悬浮物、有机物、氨氮和有毒物质等。本课题研究水样为山东某皮革工业园区综合型废水,重点去除废水中的COD和氨氮,通过小试研究确定了废水处理的基本工艺,并优化相关工艺条件。本文采用物化和生化相结合的组合工艺处理废水。首先采用加碱沉淀法进行预处理,通过研究得到加碱最适pH为12,絮凝效果最好,且为氨氮吹脱提供最适pH。为降低废水处理成本,本文采用氢氧化钙和氢氧化钠两种碱组合的方式调节废水pH,先加入氢氧化钙将废水的pH调节至10左右,重金属等物质形成沉淀,再加入氢氧化钠调节pH到12,形成絮凝状态。废水COD经加碱沉淀可降低300-400 mg·L-1。继续进行氨氮吹脱,通过研究得到吹脱最适温度为30℃,吹脱最适时间为20 h。废水中的氨氮经过吹脱由666.27 mg·L-1降低至100 mg·L-1以下。然后采用好氧生化处理,酸化水解,好氧生化处理组合的方式将废水中的可生化物质基本降解,废水中的COD可将至400 mg·L-1左右。再采用Fenton氧化法处理废水,氧化降解部分废水中的污染物,同时使得废水中的部分不可生物降解污染物发生改变,废水的可生化性得到提高。通过研究得到Fenton反应的条件为:反应温度为30℃,反应初始pH为4,反应时间为1.5h,双氧水与七水合硫酸亚铁的摩尔比为5:1,Fenton反应实际用量与理论用量的比值为1.2。生化处理后的废水经过Fenton氧化,B/C可提高到0.54,COD为222.26 mg·L-1。最后进行进一步的好氧生化处理,经处理后的废水COD低于60 mg·L-1,氨氮低于10 mg·L-1,可达到《山东省海河流域水污染物综合排放标准》(DB37/675-2007)排放标准。
[Abstract]:At present, China is the largest leather manufacturing country in the world. The wastewater produced by the leather industry has a large amount of water, strong volatility, complex composition, and contains a large number of suspended solids and organic compounds. Ammonia nitrogen and toxic substances, etc. In this study, the water sample is a synthetic wastewater from a leather industrial park in Shandong Province. The COD and ammonia nitrogen are removed from the wastewater, and the basic process of wastewater treatment is determined through a pilot study. In this paper, a combination of physicochemical and biochemical processes was used to treat wastewater. Firstly, the alkali precipitation method was used to pretreat the wastewater. The optimum pH value of alkali addition was 12, and the flocculation effect was the best. In order to reduce the cost of wastewater treatment, the pH of wastewater was adjusted by the combination of calcium hydroxide and sodium hydroxide. The pH of wastewater was adjusted to about 10 by adding calcium hydroxide, and heavy metals and other substances were precipitated. Then adding sodium hydroxide to adjust pH to 12 to form flocculation state. The COD of wastewater can be reduced 300-400mg 路L ~ (-1) by alkali precipitation. The optimum temperature of blowing is 30 鈩，

本文编号：1502162