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Membrane separation process for lead-zinc smelting wastewater

A membrane separation and process technology, applied in the fields of metallurgical wastewater treatment, water pollutants, water/sewage treatment, etc., can solve the problems of low wastewater recovery rate and poor recovered water quality, and achieve high wastewater recovery rate, good reuse water quality, Simple process and economical effect

Active Publication Date: 2009-07-29
CHINA NERIN ENG +1
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AI Technical Summary

Problems solved by technology

[0002] The industrial wastewater of major domestic lead and zinc smelting enterprises adopts the heavy metal precipitation process to treat and discharge after reaching the standard. The wastewater recovery rate is low and the recycled water quality is poor.

Method used

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  • Membrane separation process for lead-zinc smelting wastewater

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Embodiment Construction

[0007] A membrane separation process for lead-zinc smelting wastewater. This process is aimed at the current situation that most of the industrial wastewater of major domestic lead-zinc smelting enterprises is treated by heavy metal precipitation process and discharged out after reaching the standard. The reuse rate is low and the water quality is poor. For engineering application and promotion, the membrane process adopts the pretreatment method of "heavy metal precipitation process + cooling system + multi-media filter + ultrafiltration", and the main process adopts "nanofiltration" process.

[0008] See accompanying drawing 1, the specific implementation mode is as follows according to technological process:

[0009] Lead-zinc smelting wastewater is firstly treated by heavy metal precipitation process to meet the standard: the wastewater first enters a mixed reaction tank, and the pH of the wastewater is adjusted to 10.5-11 by adding lime milk, and the heavy metals (mainly C...

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Abstract

The invention discloses a membrane separation process for treating lead-zinc smelting wastewater, which comprises the following steps: pretreating lead-zinc smelting industrial wastewater through the processes of a multi-media filter, ultrafiltration, and the like after the wastewater reaches the discharge standard after the treatment of a heavy metal precipitation process; and performing desalinization treatment on the wastewater by a nanofiltration process, wherein water is produced for recycling and a concentrated solution reaches the standard after an intensified coagulation treatment and is discharged. The membrane separation process has the advantages of high wastewater recovery ratio by adopting a membrane process to perform recycling treatment on the lead-zinc smelting wastewater, good recycling water quality, advanced performance and economical practicability, high automation degree, and simple and convenient manual operation.

Description

technical field [0001] The invention relates to a method for separating industrial wastewater, in particular to a membrane separation process for lead-zinc smelting wastewater. Background technique [0002] The industrial wastewater of major domestic lead and zinc smelting enterprises adopts the heavy metal precipitation process and is discharged after meeting the standard. The wastewater recovery rate is low and the recycled water quality is poor. Contents of the invention [0003] The object of the present invention is to provide a membrane separation process for lead-zinc smelting wastewater, which has a high recycling rate of wastewater (up to 75%-80%) and low operating cost. . [0004] The technical solution of the present invention is: a membrane separation process for lead-zinc smelting wastewater, the process steps: the industrial wastewater of lead-zinc smelting is treated up to the standard through the heavy metal precipitation process (that is, the main heavy m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/44C02F1/62C02F1/52C02F1/66C02F101/20C02F103/16
Inventor 张铭发龙燕明亮张伟健钟勇吴健强吴斌秀关泽安陈忠张宏伟
Owner CHINA NERIN ENG
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