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System for treating heavy metal wastewater

A waste water treatment system, heavy metal technology, applied in water/sewage multi-stage treatment, biological water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of serious scaling, exceeding the standard, and low removal rate

Inactive Publication Date: 2013-05-15
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The discharge of acidic heavy metal wastewater will cause serious pollution to the surrounding ecological environment
[0004] In the prior art, more than 90% of the heavy metal wastewater in the non-ferrous metal industry adopts the ordinary lime method. Most of the lime methods have the disadvantages of serious scaling, easy blockage of pipelines, and unstable operation. They not only consume a large amount of lime, but also produce a large amount of toxic Hazardous waste neutralization slag, while the lime precipitation method has a low removal rate for cadmium and arsenic in wastewater, and most of the cadmium and arsenic in the effluent exceed the standard

Method used

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  • System for treating heavy metal wastewater

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specific Embodiment approach

[0022] The preferred embodiment of the heavy metal wastewater treatment system of the present invention is:

[0023] It is mainly composed of aeration tank, neutralization tank, flocculation tank, thickening tank, mechanical filter tank, adsorption column and functional wetland in sequence. Wastewater flows into the system from the inlet of the aeration tank and is discharged from the outlet of the functional wetland.

[0024] The bottom of the aeration tank is provided with a microporous aeration device, and the Fe in the wastewater is removed by aeration. 2+ oxidized to Fe 3+ , increase Fe in the aeration tank 3+ concentration. At the same time, the system is equipped with an iron salt dosing system, which is fed by Fe 2 (SO 4 ) 3 Storage tank, Fe 2 (SO 4 ) 3 Dissolution tank, Fe 2 (SO 4 ) 3 Reservoir and Fe 2 (SO 4 ) 3 Solution metering pump composition, Fe 2 (SO 4 ) 3 The storage tank is equipped with Fe with a concentration of 0.1mol / L~1mol / L 2 (SO 4 )...

specific Embodiment

[0032] like figure 1 As shown, the heavy metal wastewater treatment system is mainly composed of an aeration tank 1, a neutralization tank 2, a flocculation tank 3, a thickening tank 4, a mechanical filter tank 5, an adsorption column 6, and a functional wetland 7.

[0033] The raw water A of the heavy metal wastewater in the non-ferrous metal mining area enters the aeration tank 1 from the water inlet 23 of the aeration tank 1. The bottom of the aeration tank 1 is equipped with a microporous aeration device 22, and the air is blown in by the blower 21, and the aeration Fe in wastewater 2+ Oxidized to Fe 3+ . At the same time, the heavy metal wastewater system is equipped with an iron salt dosing system, which consists of Fe 2 (SO 4 ) 3 Storage tank 27, Fe 2 (SO 4 ) 3 Dissolving tank 26, Fe 2 (SO 4 ) 3 Reservoir 25 and Fe 2 (SO 4 ) 3 Solution metering pump 24 forms. Fe 2 (SO 4 ) 3 Fe in storage tank 27 2 (SO 4 ) 3 The solid is shaken off to Fe 2 (SO 4 ) ...

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Abstract

The invention discloses a system for treating heavy metal wastewater. The system comprises an aeration pond, a neutralization pond, a flocculation pond, a thickening pond, a mechanical filtering tank, an absorption column, and functional wetland which are connected sequentially, and also comprises a ferric salt feeding system and a sludge backflow system. The concentration of Fe<3+> in wastewateris improved by aerating and feeding ferric salt, and the concentration of lead, arsenic and cadmium in a solution is reduced by using a Fe<3+> co-precipitation effect, and an adsorption effect of active iron hydroxide; by backflow of sludge, the feeding amount of lime is reduced by 5 to 10 percent, and the water treatment capacity is improved by 1 to 3 times; a high-flux large-aperture resin loaded with ferric hydroxide is used as adsorbent which has a strong effect of adsorbing the lead, arsenic and cadmium in wastewater, and effluent meets the requirement of V-grade water body of 'environmental quality standard of surface water' (GB3838-2002); and the functional wetland fully exerts the adsorption effect of filler on heavy meal, and an enrichment effect of plant, and the effluent reaches the requirement of III-grade water body.

Description

technical field [0001] The invention relates to heavy metal wastewater treatment technology, in particular to a heavy metal wastewater treatment system. Background technique [0002] Major heavy metal pollutants such as lead (Pb), mercury (Hg), cadmium (Cd), chromium (Cr) and metalloid arsenic (As), as well as nickel (Ni), copper (Cu), zinc (Zn), silver ( Ag), vanadium (V), manganese (Mn), cobalt (Co), thallium (Tl), antimony (Sb) and other heavy metal pollutants seriously affect environmental protection and people's health. [0003] At present, the industries that discharge heavy metal wastewater are mainly concentrated in the metal products industry, leather and its products industry, non-ferrous metal smelting and rolling processing industry, chemical raw material and chemical products manufacturing industry, and non-ferrous metal mining and dressing industries, especially in some non-ferrous metal industries. Mining areas, metal mine acid wastewater and metal smelting w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/32C02F1/28C02F101/20
CPCY02W10/10
Inventor 王建兵李实许翠华赵丽曹凤磊张春晖何绪文
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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