Treatment method of complexing heavy metal wastewater

A treatment method and technology for heavy metals, applied in water/sewage treatment, multi-stage water/sewage treatment, oxidized water/sewage treatment, etc. problem, to achieve a good replacement effect, a wide range of applications, and cost-saving effects

Active Publication Date: 2015-02-18
广东西江环保科技有限公司
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Problems solved by technology

Calcium oxide is a common precipitant for free heavy metal wastewater, but it cannot treat complex heavy metal wastewater. Calcium peroxide has oxidizing properties and can be used to treat complex heavy metal wastewater, but there are problems such as incomplete network breaking and low precipitation efficiency in the treatment.
Treatment methods such as reverse osmosis, ion exchange, heavy metal traps, and activated carbon adsorption are costly, and some traps have no effect on the removal of certain heavy metals, which has limitations in the treatment of industrial wastewater containing a variety of heavy metals

Method used

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Embodiment Construction

[0012] Treatment method: use HNO 3 Adjust the pH of the wastewater to 3, the Ca(O 2 ) 2 Added to the waste water, with the speed gradient G=100S -1 Stir for 15 minutes under the working condition, carry out oxidation displacement reaction with the complexed heavy metal, and then add Ca(OH) 2 Adjust the pH value of the water to 10, with G=30S -1 Stir for 9 minutes under the working conditions, and let it stand for 30 minutes, the heavy metals will be replaced from their complex ions and the precipitate will be removed by filtration. According to the above method, the removal rate of complexed heavy metals can reach more than 95%. Ca(O 2 ) 2 The molar ratio of heavy metals to wastewater and the removal effect are shown in Table 1-3.

[0013] Table 1, Ca(O 2 ) 2 The removal effect of oxidation displacement agent on CuEDTA (copper ion concentration in raw water: 100mg / L)

[0014] molar ratio [Ca 2+ ] / [Cu 2+ ] 1 2 2.5 3 3.5 4 4.5 5 rem...

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Abstract

The invention discloses a treatment method of complexing heavy metal wastewater. The treatment method comprises the following steps: adjusting the pH value of the wastewater to be less than 7, adding Ca(O2)2 into the wastewater, stirring for oxidation displacement reaction with complexing heavy metal, adding Ca(OH)2 for adjusting the pH value of a water body to be more than 7, and carrying out stirring, standing, filtering and settling. Compared with conventional methods of reverse osmosis, ion exchange, a heavy metal capturing agent and the like, the treatment method is relatively economic, cost-saving, energy-saving and wide in application range, and has a good displacement effect on complex compounds formed by heavy metal such as copper, arsenic, nickel, lead and zinc, EDTA (ethylene diamine tetraacetic acid), HEDP (hydroxyethylidene diphosphonic acid), NTA (nitrilotriacetic acid), tartaric acid and the like; the high-stability complexing heavy metal wastewater can be treated, and the heavy metal removal rate can be increased by more than 25% under equal addition amount in comparison with calcium peroxide.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a treatment method for complexed heavy metal wastewater. Background technique [0002] Chemical precipitation is the most common method in the treatment of heavy metal wastewater. Complex heavy metals are not easily removed in wastewater due to their strong stability. Calcium oxide is a common precipitant for free heavy metal wastewater, but it cannot treat complex heavy metal wastewater. Calcium peroxide has oxidizing properties and can be used to treat complex heavy metal wastewater, but there are problems such as incomplete network breaking and low precipitation efficiency in the treatment. . Treatment methods such as reverse osmosis, ion exchange, heavy metal traps, and activated carbon adsorption are costly, and some traps have no effect on the removal of certain heavy metals, which has limitations for the treatment of industrial wastewater containing a variety of heavy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F1/52C02F1/62C02F1/72C02F9/00
Inventor 蒋树贤王志红梅胜周倩倩
Owner 广东西江环保科技有限公司
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