Method for removing heavy metal Cr from sludge by bioleaching

A technology of biological leaching and heavy metals, applied in the direction of biological sludge treatment, sludge treatment, chemical instruments and methods, etc., can solve the problem of low removal efficiency of heavy metals

Inactive Publication Date: 2010-09-15
SHENYANG JIANZHU UNIVERSITY
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  • Abstract
  • Description
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Problems solved by technology

However, the research on the removal of heavy metals in sludge by bioleaching is still in its infancy, and the research on the removal mechanism and influencin

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  • Method for removing heavy metal Cr from sludge by bioleaching

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Embodiment 1

[0021] Take the concentrated sludge in two reactors (one of the reactors is used as a parallel test), and control the sludge concentration at 15g / L-25g / L, and add 3%-6% acclimation to the two reactors at the same time The inoculum, the effective volume of the two reactors is 3L, air aeration is used, and the air velocity is maintained at 0.20-0.35m 3 / h, the initial pH value is controlled at 5.60-5.85, the ratio of substrate concentration to sludge volume (dry weight) is 0.5-0.8, the dissolved oxygen concentration is 7.5-9.0mg / L mg / L, and the temperature is controlled at 25-30°C. Regularly replenish the water consumed by evaporation in the reactor. Samples were taken at intervals, and the samples were centrifuged in a centrifuge for 5-15 minutes to separate the supernatant from the precipitate, and the pH value of the supernatant and the concentration of heavy metals in the leachate were measured. After 8-10 days of bioleaching cycle, the removal rate of heavy metal Cr in the...

Embodiment 2

[0023] The specific method is the same as in Example 1, except that 3% to 6% of the acclimation inoculum is not cast in the process of Example 2, but the sedimentation sludge after the leaching cycle of Example 1 is used as the return sewage of Example 2. Mud, its reflux ratio is 10% to 25%. After 8-10 days of biological leaching cycle, the removal rate of heavy metal Cr in the sludge reaches 40%-52%, which basically meets the sludge reuse standard for agriculture and forestry.

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Abstract

The invention provides a method for removing a heavy metal Cr from sludge by bioleaching, relates to technology for processing municipal solid waste, and aims to solve the problem of restriction on recycling the sludge, which contains higher heavy metal Cr content, of municipal sewage plants in agriculture and forestry. The method comprises the following steps of: adding a proper amount of cultured and domesticated inoculating solution in a reaction system, wherein the ratio of the substrate concentration to the sludge quantity (dry weight) is controlled to be 0.5-0.8; the sludge concentration is 15-25 g/L; the dissolved oxygen concentration is 7.5-9.0 mg/L; the reflux ratio of the sludge is 10-20 percent; and the temperature is controlled to be 25-30 DEG C; and supplementing water which is evaporated in a reactor regularly. By using the method, the removal rate of the heavy metal Cr reaches 45-55 percent through the bioleaching period.

Description

technical field [0001] The invention relates to municipal solid waste treatment technology, in particular to a technical method for removing heavy metal Cr in sludge by biological leaching. Background technique [0002] In recent years, my country has paid full attention to pollution control, emission reduction and sewage treatment, and urban sewage treatment projects have developed rapidly. However, most of the resulting sludge is landfilled, which wastes a lot of land. It has caused serious secondary pollution to the environment. The disposal and utilization of sludge has increasingly become a big problem that needs to be solved urgently in our country. In fact, the disposal and utilization of excess sludge from urban sewage treatment plants is a worldwide technical problem, and it has become an important research topic in the field of environmental science in recent years. [0003] In recent years, the residual sludge of sewage treatment plants has not only produced a la...

Claims

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Application Information

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IPC IPC(8): C02F11/02C02F101/22
CPCY02W10/20
Inventor 傅金祥韩汝佳唐玉兰赵玉华马兴冠由昆张荣新周东旭
Owner SHENYANG JIANZHU UNIVERSITY
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