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Method for regulating plant available heavy metals in municipal sludge composting

A heavy metal and sludge technology, applied in the preparation and application of sewage/sludge fertilizer, organic fertilizer, etc., can solve the problems of lack of targeted stabilization, endangering human health, etc., and reduce the content of heavy metals in plant-available state. , the effect of promoting reduction

Inactive Publication Date: 2019-10-22
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This passivation stabilization method is not specific to plant-available heavy metals, but as a truly high-risk part, the compost of plant-available heavy metals has not been stabilized in a targeted manner, causing a large amount of heavy metals in compost products to enter the plant. , thus entering the food chain and endangering human health

Method used

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  • Method for regulating plant available heavy metals in municipal sludge composting
  • Method for regulating plant available heavy metals in municipal sludge composting
  • Method for regulating plant available heavy metals in municipal sludge composting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Collect municipal sludge products at a depth of 20cm.

[0035] 2) Pretreatment: Vacuum dry the municipal sludge below -54°C until the moisture content is lower than 0.1%; then grind the municipal sludge to 100 mesh with an agate mortar, sieve and collect the municipal sludge powder, and use the same method to obtain straw powder.

[0036] 3) Take 10g of municipal sludge powder after pretreatment, soak the sludge powder with 10ml of 0.5mol / L HC1 for every 1g of sludge, wash the sample with pure water after standing for 10h, wash 3 times, and then freeze-dry, Detect carbon content and nitrogen content wherein with elemental analyzer, calculate carbon-nitrogen ratio to be 6.88;

[0037] Take 10 g of the pretreated straw powder, detect the carbon content and nitrogen content in it with an elemental analyzer, and calculate the carbon-nitrogen ratio to be 319.

[0038] 4) According to the above calculation formula (I), bring in the carbon-nitrogen ratio of municipal slud...

Embodiment 2

[0041] Get the sludge obtained through step 3) in embodiment 1, according to the calculation formula (I) as mentioned above, bring into the carbon-nitrogen ratio of municipal sludge and stalks, calculate the carbon-nitrogen ratio of the mixed material, when mixed When the carbon-to-nitrogen ratio of the material is 8, sludge: straw = 0.856: 0.144 can be obtained in terms of mass. Take 0.856 tons of municipal sludge and 0.144 tons of straw, mix them, and compost them.

[0042] The same method used in step 5) of Example 1 was used to detect the plant-available heavy metal content in the compost product.

Embodiment 3

[0044] Get the sludge obtained through step 3) in embodiment 1, according to the calculation formula (I) as mentioned above, bring into the carbon-nitrogen ratio of municipal sludge and stalks, calculate the carbon-nitrogen ratio of the mixed material, when mixed When the carbon-to-nitrogen ratio of the material is 12, sludge: straw = 0.592: 0.408 can be obtained in terms of mass. Take 0.592 tons of municipal sludge and 0.408 tons of straw, mix them, and compost them.

[0045] The same method used in step 5) of Example 1 was used to detect the plant-available heavy metal content in the compost product.

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Abstract

The invention relates to a method for regulating the plant available heavy metals in municipal sludge composting. The method comprises: adjusting the key parameters of materials in a composting process; mixing the compost materials according to a certain ratio; carrying out composting treatment; extracting the contents of the plant available heavy metals in the composting product; and obtaining the optimal composting environment of the municipal sludge by calculating the abundance change of the plant available heavy metals in the compost product. According to the present invention, with the method, the risk of heavy metals in composting products can be evaluated, and the risk of the composting environment can be controlled through a certain regulating measure.

Description

technical field [0001] The present disclosure relates to a method for regulating heavy metals available to plants in municipal sludge compost. Background technique [0002] Municipal sludge composting is a mainstream sludge treatment method, which can recover the organic matter and reduce the environmental risk of sludge. There are many ways to use municipal sludge compost products, including farmland, garden and soil remediation, but the high heavy metal content limits the compost application of municipal sludge. The main risk of heavy metals in municipal sludge comes from the part that can be absorbed by plants, that is, heavy metals that can be used by plants. This part of heavy metals is easy to enter the food chain, thereby affecting human and biological health. [0003] However, the current control measures for composting heavy metals mainly include some passivation methods, so that heavy metals are passivated and stabilized. This passivation stabilization method is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F15/00C05F17/00
CPCC05F7/00C05F17/00C05F11/00Y02W30/40
Inventor 黄彩红席北斗唐朱睿檀文炳夏湘勤郭威
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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