高浓度机械加工清洗废水预处理工艺研究 |
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引用本文: | 陈敬,朱乐辉,刘小虎. 高浓度机械加工清洗废水预处理工艺研究[J]. 工业水处理, 2016, 0(4) |
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作者姓名: | 陈敬 朱乐辉 刘小虎 |
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作者单位: | 南昌大学资源环境与化工学院,江西南昌,330031 |
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摘 要: | 针对COD高达300 000 mg/L的机械加工清洗废水,采用破乳—热解—铁炭微电解—Fenton氧化联合工艺进行处理。研究结果表明:加入10 g/L的Al2(SO4)3破乳后,热解20 min的处理效果最好;铁炭微电解最佳条件为:维持p H至3.5,铁屑20 g/L,铁炭质量比为1∶1,反应时间4 h;Fenton氧化最佳条件为:维持p H至3.5,30%H2O2投加量为20 m L/L,反应时间4 h,再调节p H至9后沉淀,处理后废水COD可降为20 000 mg/L。
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关 键 词: | 机械清洗废水 破乳 热解 铁炭微电解 Fenton |
Research on the pretreatment process of highly concentrated mechanical cleaning wastewater |
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Abstract: | Aiming at the mechanical cleaning wastewater,whose COD is 300 000 mg/L,it has been treated by the combined process,demulsification-pyrolysis-iron-carbon micro-electrolysis-Fenton oxidation. The research results show that the treatment effect is the best after the Al2(SO4)3 whose concentration is 10 g/L is demulsified and then pyrolyzed for 20 min. The best conditions for iron-carbon micro-electrolysis are as follows:pH stays at 3.5,iron fil-ings is 20 g/L,iron-carbon mass ratio 1∶1,and reaction time 4 h. The best conditions for Fenton oxidation process are as follows:pH is 3.5,dosage of 30%hydrogen peroxide 20 mL/L,reaction time 4 h,and precipitation after the pH is conditioned to 9,the COD of the treated wastewater can be decreased to 20 000 mg/L. |
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Keywords: | machining cleaning wastewater demulsification pyrolysis iron-carbon micro-electrolysis Fenton oxi-dation |
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