Novel method for processing heavy metal in sludge through bioleaching

A bioleaching and heavy metal technology, applied in the direction of biological sludge treatment, etc., can solve the problems of high operation and management costs, high environmental requirements for bioleaching strains, and slow growth of bioleaching strains

Inactive Publication Date: 2012-04-25
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on bioleaching in my country mainly focuses on the experimental research of traditional bioleaching. Traditional bioleaching has the advantages of high treatment efficiency and strong practicability in treating heavy metals in sludge, but there are also relatively high operating and management costs. High, bioleaching strains have high environmental requirements, and bioleaching strains grow slowly, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Take a certain amount of sludge treated by bioleaching, place it in a bioleaching reactor, and then put untreated sludge into the bioleaching experiment directly. During the reaction process, there is no need to add bioleaching to the reactor. Filter species. At the same time, the temperature in the biological leaching process is controlled at 35°C, the pH value is 2.5, and the dissolved oxygen is 3 mg / L, and the heavy metal content in the sludge is periodically detected. After the heavy metal content in the sludge drops to the relevant standards stipulated by the state, 50%- 95% of the sludge, and then use the remaining sludge in the reactor for the next leaching treatment cycle. The removal rate of heavy metals was 72%.

Embodiment 2

[0013] Take a certain amount of sludge treated by bioleaching, place it in the bioleaching reactor, and then put the untreated sludge into the bioleaching experiment directly. During the reaction process, there is no need to add bioleaching to the reactor. Filter species. At the same time, the temperature in the biological leaching process is controlled at 28°C, the pH value is 2, and the dissolved oxygen is 2 mg / L, and the heavy metal content in the sludge is periodically detected. After the heavy metal content in the sludge drops to the relevant standards stipulated by the state, 50%- 95% of the sludge, and then use the remaining sludge in the reactor for the next leaching treatment cycle. The removal rate of heavy metals is 80%.

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Abstract

The invention relates to a method for processing heavy metal in sludge, particularly a method for removing heavy metal in sludge by recycling residual sludge after leaching and needing no additional strains. In the process of sludge reaction, by controlling the reaction temperature to 28-35 DEG C, the pH value to 2-2.5, and the dissolved oxygen to 2-3 mg/L, the effect of removing heavy metal in sludge is guaranteed. Compared with the techniques of processing heavy metal in sludge in the prior art, especially a traditional bioleaching method, the use of the method disclosed herein saves the culture time of strains, and reduces the difficulties of operators for operation management. According to the invention, the invention guarantees that improved strains have strong activity in every processing stage, residual partial sludge after processing is used as the strain, thus the reaction of removing heavy metal in sludge through a biological method can be guaranteed to carry out. The method has the advantages of simple structure, convenient operation management, low production cost and the like, and has good supporting effect of processing and utilizing urban sludge.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a novel technology for treating heavy metals in sludge by biological leaching which greatly reduces the content of heavy metals in sludge and reduces the cultivation of biological leaching strains. Background technique [0002] Municipal sludge refers to the solid, semi-solid and liquid wastes produced by sewage treatment plants. In 1998, my country has included wastewater treatment sludge in the "National List of Hazardous Wastes". Due to the activated sludge wastewater treatment process, the amount of residual sludge produced accounts for about 0.3%-0.5% of the treated water (moisture content is 97%), so the amount of sludge produced is very large. A large amount of urban sludge is produced, and the application prospect of sludge land use is broad. The treatment and resource utilization of urban sludge has become an increasingly prominent environmental prob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02
Inventor 傅金祥张祥楠张荣新
Owner SHENYANG JIANZHU UNIVERSITY
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