Method for treating smelting wastewater containing heavy metals

A treatment method and heavy metal technology, applied in the field of environmental science, to achieve the effects of reducing the amount of sediment, ensuring the quality of effluent water, and improving the comprehensive utilization of resources

Inactive Publication Date: 2012-03-21
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] For smelting wastewater containing heavy metals, the micro-electrolysis method has a good effect on the treatment of heavy metal ions, but has a poor effect on non-metallic pollution ions (such as arsenic, fluorine, etc.), chemical flocculation The method has a good treatment effect on low-concentration heavy metal ions and non-metallic pollution ions (such as arsenic, fluorine, etc.), but the treatment effect on high-concentration heavy metal ions is not ideal

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  • Method for treating smelting wastewater containing heavy metals

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Embodiment 1

[0038] figure 1 It is a flow chart of the micro-electrolysis-chemical flocculation process for treating smelting wastewater containing heavy metals. The production workshop of a large-scale copper sulfide smelter contains heavy metal wastewater. The wastewater is mainly the ground flushing water of the smelter production workshop. The wastewater volume is 1000t / d, the pH of the wastewater is 5-6, and the heavy metal content (mg / L) is: Cu: 20.66 , Zn: 4.53, Pb: 1.80, Cd: 5.60, As: 3.71. In the treatment test, the waste water was collected and settled in the sedimentation tank to remove particulate matter, then adjusted to pH=3.0-3.5 with sulfuric acid, and the pretreated waste water was transferred to the fixed-bed micro-electrolysis equipment for iron-carbon micro-electrolysis treatment, and aeration was carried out during the treatment process; the fixed bed It is composed of iron and carbon granular fillers and iron-carbon structured fillers (structured fillers account for...

Embodiment 2

[0040] The acid washing workshop of a copper sulfide smelter contains heavy metal pickling wastewater, the wastewater volume is 200t / d, the wastewater contains 6-8% sulfuric acid, and the heavy metal components (mg / L) are: Cu: 181.70, Zn: 28.27, Pb: 167.05, Cd: 15.60, As: 176.71, F: 319.23. In the treatment test, the wastewater was adjusted to pH=2.5 with lime, and the supernatant was transferred to rolling micro-electrolysis equipment (rolling bed) for iron-carbon micro-electrolysis treatment after static precipitation. The total mass of iron and carbon particles accounted for the total mass of fillers. 100%, the ratio of iron to carbon mass is 5:1, using continuous flow iron-carbon micro-electrolysis secondary treatment, each stage of hydraulic retention is 25min, after the end of micro-electrolysis, the wastewater enters the aeration flocculation tank, adopts continuous aeration, aeration 3m 3 / m 3 Water, aeration time 40min, adjust pH=11.0 with milk of lime during aera...

Embodiment 3

[0042] Production wastewater in the indium zinc production workshop of an indium zinc smelter, the wastewater volume is 50t / d, the wastewater pH is 2.5-3.0, and the heavy metal content (mg / L) is: Cu: 4.32, Zn: 543.56, Pb: 2.77, Cd: 5.58 , As: 5.992, F: 19.06. In the treatment test, there is no particulate matter in the wastewater, and the pH of the wastewater is 2.5-3.0, which meets the requirements of iron-carbon micro-electrolysis treatment. Therefore, the wastewater directly enters the bottom aeration fluidized electrolytic cell (aeration fluidized bed) for iron-carbon micro-electrolysis treatment. The sum of the total mass of iron and carbon particles accounts for 100% of the total mass of the filler, and the ratio of iron to carbon mass is 1:1-2:1. Continuous flow iron-carbon micro-electrolysis is used for primary treatment, and the hydraulic retention is 30min. Continuous micro-electrolysis Aeration, the aeration volume is 3.0m 3 / m 3 water, and most of the ferrous io...

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Abstract

The invention discloses a method for treating smelting wastewater containing heavy metals. The method comprises the following steps: 1, the smelting wastewater containing heavy metals is pretreated to remove particulate impurities in the wastewater and adjust the wastewater to be acidic; 2, the wastewater is transferred to an iron-carbon micro-electrolytic reactor to be subjected to single-stage or multi-stage micro-electrolytic electrochemical treatment under acidic conditions to remove most heavy metal ions in the wastewater, the wastewater is adjusted to be weakly alkaline or alkaline, is subjected to single-stage or multi-stage chemical flocculation treatment to further remove other heavy metal ions, and pollutants of arsenic, fluorine, chlorine and the like in the wastewater; and 3, solid-liquid separation is carried out to obtain production water which can be recycled. The method comprises steps of wastewater pretreatment, iron-carbon micro-electrolysis, chemical flocculation and solid-liquid separation which are organically coupled in series. The method which organically combines the micro-electrolysis with the chemical flocculation and allows them to mutually cooperate with each other and co-perform effects has the advantages of simple treating process and technology, low treatment cost, high treatment efficiency, and standard-reached discharge and recovery of the treated wastewater.

Description

technical field [0001] The invention relates to a treatment method for smelting wastewater containing heavy metals, belonging to the field of environmental science and technology. Background technique [0002] Smelting wastewater containing heavy metals refers to industrial wastewater containing a large amount of heavy metals discharged during the production process of metallurgical industry. Smelting wastewater containing heavy metals (such as lead, cadmium, copper, mercury, zinc, arsenic, fluorine, etc.) is one of the most serious environmental pollution and one of the most harmful industrial wastewater to humans. Heavy metals in smelting wastewater containing heavy metals generally cannot be decomposed and destroyed, but can only transfer their location and change their physical and chemical forms. At present, in the actual treatment and application of heavy metal-containing smelting wastewater, methods such as neutralization precipitation method, ferrite method and v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F1/461C02F1/52C02F1/56C02F103/16
Inventor 徐晓军杨津津黄伟忠黄昌元韦建初王刚陈晓宏施国飞
Owner KUNMING UNIV OF SCI & TECH
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