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System for treating heavy metal wastewater

A waste water treatment system, heavy metal technology, applied in the direction of biological water/sewage treatment, adsorption water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as unstable operation, large lime consumption, serious scaling, etc.

Inactive Publication Date: 2012-06-20
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
  • System for treating heavy metal wastewater

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specific Embodiment approach

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

[0023] It is mainly composed of an aeration tank, a neutralization tank, a flocculation tank, a dense tank, a mechanical filter tank, an adsorption column, and a functional wetland in sequence. Wastewater flows into the system from the water inlet of the aeration tank and is discharged from the water 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+ , to increase Fe in the aeration tank 3+ concentration. At the same time, the system is equipped with an iron salt dosing system, which consists of Fe 2 (SO 4 ) 3 storage tank, Fe 2 (SO 4 ) 3 Dissolving 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...

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 materials and chemical product manufacturing industry, and non-ferrous metal mining and dressing industry, etc., especially in some non-ferrous metal industries. Mining areas, metal mine acid wastewater and metal smelti...

Claims

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Application Information

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Patent Type & Authority Applications(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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