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Process for treating heavy-metal waste water containing high concentration suspended matter

A technology for wastewater treatment and suspended solids, which is applied in the field of resources and the environment, can solve problems such as the decline in utilization rate, achieve the effect of reducing load and avoiding regeneration

Inactive Publication Date: 2009-02-18
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For heavy metal wastewater containing high concentrations of suspended solids, the utilization rate of the above-mentioned treatment agents will decrease. Therefore, at present, it is used to clarify and remove suspended solids first, and then settle heavy metals, which requires secondary sedimentation.

Method used

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  • Process for treating heavy-metal waste water containing high concentration suspended matter

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Experimental program
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Effect test

Embodiment 1

[0018] Treatment containing suspended matter SS=50g / L, Mn 2+ =50mg / L, Cu 2+ =50mg / L of waste water.

[0019] Using hydrochloric acid as an acidifying agent, hydrochloric acid and granular chitosan were acidified in an acidizing tank to form a 5% soluble chitosan solution, and the pH value of the solution was 3.0. The waste water enters the flocculation reaction tank and the chitosan solution flowing out from the acidification tank undergoes metal chelation and flocculation reactions. polysaccharide 0.2g / L waste water).

[0020] Milk of lime is used as the neutralizing agent, and the neutralizing agent is added to the wastewater after the above reaction. After neutralization, the pH value is about 7.0, and then the wastewater enters the sedimentation tank for clarification and sludge concentration, and the supernatant is sent to the adsorption column.

[0021] The adsorption column is filled with 20 mesh fine granular chitosan. After the adsorbent reaches saturation, replac...

Embodiment 2

[0024] Treatment containing suspended matter SS=20g / L, Mn 2+ =50mg / L, Zn 2+ =50mg / L of waste water.

[0025] Sulfuric acid is used as an acidifying agent, and sulfuric acid and granular chitosan are acidified in an acidizing tank to form a 1% soluble chitosan solution with a pH value of 2.5. The waste water enters the flocculation reaction tank and the chitosan solution flowing out of the acidification tank has metal chelation and flocculation reactions, and the amount of chitosan is 0.8g / L waste water (wherein directly adding chitosan 0.4g / L waste water, comes from the shell of adsorption saturation polysaccharide 0.4g / L waste water).

[0026] Milk of lime is used as the neutralizing agent, and the neutralizing agent is added to the wastewater after the above reaction. After neutralization, the pH value is about 8.0, and then the wastewater enters the sedimentation tank for clarification and sludge concentration, and the supernatant is sent to the adsorption column.

[002...

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Abstract

The invention discloses a treatment method of heavy metal wastewater which contains high concentrated suspended substance. The method uses case collection sugar acidic solution as the heavy metal flocculant which can be settled when the pH value is 7-9 and can rapidly separate the suspended substance. The condensation of the heavy metal ion in wastewater can be reduced after being separated. And then, after the wastewater is adsorbed by fine particle case collection sugar, the wastewater can reach the discharge standard. At the same time, the saturated case collection sugar can be adsorbed and can be taken as the supplement heavy metal flocculant after being processed acidifying action. The treatment method has simple process which is convenient to be operated. The adsorption agent can be used for the second time, and the regeneration can be avoided.

Description

technical field [0001] The invention belongs to the direction of water pollution prevention and control in the technical field of resources and environment, and relates to a process for separating suspended matter in water and removing heavy metal ions. Background technique [0002] Heavy metals refer to metals with specific gravity greater than 5, such as copper (Cu), lead (Pb), zinc (Zn), iron (Fe), cobalt (Co), nickel (Ni), vanadium (V), mercury (Hg). With the rapid development of modern industry, the discharge of heavy metal industrial wastewater is increasing day by day. In addition to the traditional mining, natural gas, papermaking, electroplating, tanning, metal surface treatment and chlor-alkali industries, the industries that discharge heavy metal wastewater also include the microelectronics industry closely related to the current IT industry, and environmental protection industries, such as flue gas desulfurization systems. desulfurization wastewater. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/52C02F1/66C02F1/28C02F11/12
Inventor 吴忠标倪伟敏官宝红王凯南王海强
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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