Processing method and processing system thereof for acidic waste water containing heavy metals

A technology of acid wastewater and treatment method, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as process accidents, blockage of water pipelines, damage to treatment equipment, etc. Achieve the effect of stable process operation, reduce processing cost and increase pH value

Active Publication Date: 2010-08-25
CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the effluent treated by chemical method is used for industrial reuse, the calcium content in the effluent is too high and the hardn...

Method used

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  • Processing method and processing system thereof for acidic waste water containing heavy metals
  • Processing method and processing system thereof for acidic waste water containing heavy metals
  • Processing method and processing system thereof for acidic waste water containing heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Treatment of a non-ferrous smelting wastewater

[0057] The pH value of a copper smelting wastewater to be treated is 2.45, and the contents of As, Cd, Cu and Zn are 5463mg / L, 808.20mg / L, 373.30mg / L and 3198.0mg / L respectively.

[0058] A kind of treatment system that is used for the wastewater treatment of the present embodiment as shown in Figure 2, and this treatment system comprises the regulation pond, internal electrolysis pond, electrochemical reaction pond, sedimentation pond and filter pond that are connected successively, each treatment pond is A water inlet and a water outlet are provided, and the treatment pools are connected by pipes (or ditches, etc.); wherein, a reaction bed is provided in the inner electrolytic pool, and the reaction bed is filled with zeolite modified by cationic surfactants, The filter material is composed of carbon powder and iron filings, the mass ratio of carbon powder and iron filings is 1:10, and the modified zeolite content is 1%...

Embodiment 2

[0069] Treatment of an electroplating wastewater

[0070] The pH value of a certain electroplating wastewater to be treated is 3.43, where Cr 6+ , Zn, Ni, and Cu contents were 26.0mg / L, 56.4mg / L, 90.8mg / L, and 8.28mg / L, respectively.

[0071] The method for processing the above-mentioned electroplating wastewater to be treated using the treatment system in Example 1 specifically comprises the following steps:

[0072] (1) Pretreatment: the electroplating wastewater is transported to a water quality adjustment pool, and the large particles and impurities in the wastewater are removed through grid pretreatment;

[0073] (2) Internal electrolytic treatment: input the pretreated effluent into the internal electrolytic cell, so that the effluent flows through the reaction bed provided in the internal electrolytic cell. Under aeration conditions, the reaction time in the internal electrolytic cell is controlled to 15min. The effluent after internal electrolysis treatment enters th...

Embodiment 3

[0081] Treatment of a strong acidic heavy metal wastewater

[0082] A strong acidic heavy metal wastewater to be treated has a pH value of 0.3, and the contents of As, Cd, Zn, and Cu are 66.6mg / L, 111.7mg / L, 32.1mg / L, and 757.1mg / L, respectively.

[0083] The method for processing the above-mentioned strongly acidic heavy metal wastewater to be treated using the treatment system in Example 1 specifically comprises the following steps:

[0084] (1) Pretreatment: the strong acidic heavy metal wastewater is transported to a water quality adjustment tank, and the large particles and impurities in the wastewater are removed through grid pretreatment;

[0085] (2) Internal electrolytic treatment: input the pretreated effluent into the internal electrolytic cell, make the effluent flow through the reaction bed set in the internal electrolytic cell, under aeration conditions, the reaction time in the internal electrolytic cell is controlled to 30min, Part of the treated water after t...

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Abstract

The invention belongs to a multilevel processing method of waste water and a processing system thereof, and in particular discloses a processing method and a processing system for acidic waste water containing heavy metals. The invention comprises the following steps of: mixing carbon powder and scrap iron, adding modified zeolite, and placing the mixture into an inner electrolytic cell; conveying preprocessed waste water into the inner electrolytic cell, and reacting for 10 to 30 minutes under aeration condition; enabling outlet water to enter an electrochemical reaction cell directly, wherein the space between polar plates in the cell is from 0.6 to 1.4 cm, and reacting for 5 seconds to 5 minutes; and precipitating the outlet water, and separating solid from liquid. The processing system comprises a regulation cell, the inner electrolytic cell, the electrochemical reaction cell, a precipitating cell and a filtering cell which are sequentially connected, wherein the inner electrolytic cell is internally provided with a reaction bed, filter materials consisting of zeolite, carbon powder and scrap iron are filled in the reaction bed, an electrochemical reactor is installed in the electrochemical reaction cell, and a surface film filter is arranged in the filtering cell. The processing method has the advantages of wide application range, stable operation, good processing effect, low processing cost, environment protection, no pollution, and the like.

Description

technical field [0001] The invention relates to a wastewater multistage treatment method and a treatment system thereof, in particular to a wastewater multistage treatment method containing electrochemical treatment steps and a treatment system thereof. Background technique [0002] Heavy metals generally refer to metals with a specific gravity greater than 4 or 5, and there are about 45 kinds. The usual heavy metal pollution mainly refers to the environmental pollution of heavy metals with significant biological toxicity such as mercury, lead, cadmium, chromium and arsenic, and also includes certain toxicity. pollution of heavy metals (such as zinc, copper, cobalt, nickel, tin, vanadium, etc.). Heavy metal pollutants are relatively difficult to control. They are mainly lost to the environment through mining, smelting, sewage irrigation, sludge, fertilization, and atmospheric deposition. When they accumulate in water bodies to a certain limit, they will cause damage to water...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/461C02F1/463C02F1/52
Inventor 谭自强付中和蒋晓云姚健王强
Owner CHANGSHA HASKY ENVIRONMENTAL PROTECTION TECH DEV CO LTD
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