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Treatment method for reducing toxicity of tanning sludge

A technology of tannery sludge and treatment method, which is applied in the directions of sewage/sludge fertilizer, biological organic part treatment, preparation of organic fertilizer, etc. Environmental risks and other issues, to achieve the effect of simple operation, easy control of process parameters, and conducive to large-scale production

Inactive Publication Date: 2019-09-10
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a product of a large amount of chromium preparations used in the tanning and retanning process, the Cr content in tannery sludge is very high, which makes the utilization of tannery sludge have a high environmental risk, especially Cr 6+ have higher toxicity

Method used

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  • Treatment method for reducing toxicity of tanning sludge
  • Treatment method for reducing toxicity of tanning sludge
  • Treatment method for reducing toxicity of tanning sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The tannery sludge and chicken manure were mixed at a volume ratio of 3:1, and the initial moisture content was 65%, covered with plastic film for strip-stack pre-composting. In the initial stage, the temperature of the compost rapidly rises to above 50°C and is maintained for 15 days. The compost is artificially turned and ventilated every day. After 20 days of high-temperature composting, pre-composted sludge with a diameter of about 3-4 cm after crushing is obtained. Using pre-composted sludge accounting for 30% of the total composting material as raw material, supplemented with additives such as straw, chicken manure, fly ash and bentonite, the materials are mixed evenly according to the volume ratio of 6:6:5:2:1, and the initial moisture content is adjusted After fully mixing, place it in a composting tank for aerobic composting, use a blower to mechanically ventilate, blow air for 30 minutes every day, and maintain the oxygen content of the heap above 18%. The tem...

Embodiment 2

[0032] The tannery sludge and chicken manure were mixed at a volume ratio of 3:1, and the initial moisture content was 65%, covered with plastic film for strip-stack pre-composting. In the initial stage, the temperature of the compost rapidly rises to above 50°C and is maintained for 15 days. The compost is manually turned every day for ventilation. After 20 days of high-temperature composting, pre-composted sludge with a diameter of about 3-4 cm after crushing is obtained. Using pre-composted sludge accounting for 50% of the total composting material as raw material, supplemented with additives such as straw, chicken manure, fly ash and bentonite, the materials are mixed evenly according to the volume ratio of 10:5:1:3:1, and the initial moisture content is adjusted After fully mixing, place it in a composting tank for aerobic composting, adopt mechanical forced ventilation, blow air for 30 minutes every day, and maintain the oxygen content of the heap above 18%. The temperat...

Embodiment 3

[0036] The tannery sludge and chicken manure were mixed at a volume ratio of 3:1, and the initial moisture content was 65%, covered with plastic film for strip-stack pre-composting. In the initial stage, the temperature of the compost rapidly rises to above 50°C and is maintained for 15 days. The compost is manually turned every day for ventilation. After 20 days of high-temperature composting, a crushed pre-composted sludge with a diameter of about 3-4 cm is obtained. Using pre-composted sludge accounting for 70% of the total composting material as raw material, supplemented with additives such as straw, chicken manure, fly ash and bentonite, the materials are mixed evenly according to the volume ratio of 14:3:1:0:2, and the initial moisture content is adjusted After fully mixing, place it in the composting tank for aerobic composting, adopt mechanical forced ventilation, blow air for 30 minutes every day, and maintain the oxygen content of the heap above 18%. The temperature...

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Abstract

The invention provides a treatment method for reducing toxicity of tanning sludge and belongs to the field of treatment of solid wastes. The treatment method mainly comprises the following steps: performing pre-composting and fine composting treatment, taking tanning sludge as a raw material, preferentially taking straws, chicken manure, fly ash and bentonite as filled materials to mix with co-composting manure, performing thorough decomposition to reduce biotoxicity, and fixing heavy metals so as to achieve aims of hazard-free treatment and recycling. Most of the materials involved in the method disclosed by the invention are wastes and are cheap and wide in source, the process is simple in operation, process parameters are easily controlled, and large-scale production is facilitated. Therefore, the method disclosed by the invention has a certain environmental and economic benefits.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and mainly relates to the harmless resource utilization technology of tannery sludge composting treatment, aiming at reducing heavy metals in tannery sludge, especially Cr 6+ Toxicity, improve bioavailability, facilitate further resource utilization. Background technique [0002] my country is one of the largest leather production countries in the world, with a large amount of leather production and concentrated industrial pollution. Tannery sludge as a by-product also brings great pollution. Tannery sludge pollutants are complex in composition, including protein, oil, dye, sulfide, chloride, sulfate and heavy metal salts (mainly chromium). Its toxicity to the ecological environment is mainly manifested in two aspects, namely biological toxicity and heavy metal toxicity. Excessive salinity and sodium ions will cause physiological water shortage in plants, make the soil harden when it encoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05F17/00
CPCC05F3/00C05F17/00C05G3/00C05F7/00C05F11/00Y02W30/40
Inventor 李艳霞安思羽童心
Owner BEIJING NORMAL UNIVERSITY
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