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A resource disposal method for low-concentration heavy metal ion wastewater

A low-concentration heavy metal and heavy metal ion technology, which is applied in chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of difficult engineering promotion and application, upgrading of reaction equipment materials, and reduction of power utilization efficiency, etc. problems, to achieve the effect of alleviating the deteriorating environment of water resources, reducing the expenditure of water resource costs, and reducing the payment of sewage charges

Active Publication Date: 2022-01-25
山东深信节能环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition to the above reasons, electrodeposition technology has strict requirements on the pH of wastewater. If the pH value of wastewater is too low, the efficiency of power utilization will be greatly reduced, and the materials of reaction equipment also need to be upgraded.
At the same time, the electrodeposition residual liquid is generally treated by chemical precipitation, which will also generate a large amount of hazardous waste sludge, making it difficult to realize engineering promotion and application

Method used

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  • A resource disposal method for low-concentration heavy metal ion wastewater
  • A resource disposal method for low-concentration heavy metal ion wastewater
  • A resource disposal method for low-concentration heavy metal ion wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1: Combining figure 1 and figure 2 ; A resource disposal method for low-concentration heavy metal ion wastewater, characterized in that, comprising the following steps,

[0037]The low-concentration heavy metal ion wastewater to be treated enters the enrichment system for treatment. According to the different treatment methods selected by the enrichment system, the heavy metal ions in the water can be trapped inside the treatment system or exist in the concentrated water of the system effluent; enrichment The heavy metal ion standard water produced by the system can be discharged, reused or entered into the next treatment process;

[0038] When the heavy metal ions in the wastewater are trapped inside the treatment system, it is necessary to use the desorption liquid to desorb the system when the enrichment system is operating to a saturated state, so that the adsorbed heavy metal ions are desorbed in the desorption liquid. Form a desorption dope containing h...

Embodiment 2

[0043] Embodiment two: as a further improved scheme or a parallel scheme, the enrichment system selects the adsorbent method to form an adsorbent-electrodeposition combined process, and the copper-containing wastewater (ρ(Cu 2+ )=400mg / L, pH=5) for recycling.

[0044] Polypyrrole-titanium dioxide composite adsorbent (PPy-TiO 2 Adsorbent, self-made, Langmiur, 2018, 34:10187) to treat copper-containing wastewater, the dosage of the adsorbent is 2g / L, and the adsorption effect is the best at 25°C for 2h. 0.1M of H 2 SO 4 The solution was passed through the saturated PPy-TiO 2 Desorbed in the adsorbent, Cu can be obtained 2+ The desorption concentrate with a mass concentration of 8080 mg / L and a pH of 1. Conduct electrodeposition test on the desorption concentrate to recover copper, at a current density of 200A / m 2 , temperature 60°C, pH 1, plate spacing 15mm, electrolysis time 4h, for 500mL initial Cu 2+ The mass concentration is 8080mg / L for electrolysis, the copper recov...

Embodiment 3

[0045] Embodiment three: as a further improved scheme or a parallel scheme, the enrichment system selects the ion exchange resin method to form an ion exchange resin-electrodeposition combined process, and the copper-containing wastewater (ρ(Cu 2+ )=600mg / L, pH=2) for recycling.

[0046] Using iminodiacetic acid type chelating resin (D402 chelating resin, purchased) to treat copper-containing wastewater, the removal rate is 4 when the pH is 4, the dynamic adsorption effect is the best when the maximum flow rate is 6BV / h, and the breakthrough time is 213.1 min. The mass fraction of 10% H 2 SO 4 The solution is passed into the ion exchange column that has been penetrated for desorption, and Cu can be obtained 2+ The regeneration solution with a mass concentration of 10380 mg / L and a pH of 0.8. Electrodeposition test was carried out on the regeneration solution of the resin to recover copper. Under the conditions of current density of 200A / m2, temperature of 60°C, pH of 0.8, ...

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Abstract

The invention relates to the technical field of wastewater treatment, in particular to a resource-based disposal method for low-concentration heavy metal ion wastewater. It includes the following steps. The low-concentration heavy metal ion wastewater to be treated enters the enrichment system for treatment; when the heavy metal ions in the wastewater are trapped inside the treatment system, it is necessary to use the desorption liquid to desorb the system when the enrichment system is running to a saturated state. (1) The combined process can reduce the discharge of heavy metal pollutants, alleviate the deteriorating water resources environment, and reduce the payment of sewage charges; at the same time, it can reduce the amount of new water taken and reduce the cost of water resources (2) The combined process can recycle heavy metal resources, which reduces the waste of resources and is conducive to the sustainable development of resources.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a resource-based disposal method for low-concentration heavy metal ion wastewater. Background technique [0002] Industries such as electroplating, iron and steel, non-ferrous metal smelting and chemical enterprises produce a large amount of heavy metal wastewater every year (Industrial Water Treatment, 2009, 29(3): 1). Since heavy metals cannot be biodegraded, they can only enter the organic matrix through transfer diffusion, and they are continuously enriched in the organism. When heavy metal pollutants accumulate to a certain limit, they will cause serious harm to ecosystems such as water bodies, aquatic plants, and aquatic animals, and may affect human health through the food chain. Therefore, the deep purification of such pollutants in water bodies is becoming more and more important. People pay more and more attention to it (Journal of Agricultural and Environ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/463C02F101/20
CPCC02F1/28C02F1/463C02F2101/20
Inventor 徐星徐浩高宪徐强
Owner 山东深信节能环保科技有限公司
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