Method for removing heavy metals from waste compost by united elution by ammonium sulfate and malonic acid

A technology of garbage composting and combined leaching, applied in the direction of organic fertilizer, climate change adaptation, etc., can solve problems such as secondary pollution, and achieve the effect of reducing pollution, wide application prospects, and significant leaching effect.

Inactive Publication Date: 2011-06-15
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The purpose of the present invention is to overcome the secondary pollution caused by the residual artificial chelating agent and surfactant used in the matrix; use ammonium sulfate and malonic acid combined leaching to remove heavy metals in garbage compost, and understand malonic acid rinsing at the same time What is the effect, what is the leaching effect as the concentration increases, how is the synergistic ability of malonic acid and ammonium sulfate to remove heavy metals, etc., in order to achieve the purpose of safe, effective and reasonable use of municipal solid waste composting, in order to achieve the above objectives , the present invention provides following technical method:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Compost the household garbage containing heavy metal pollution, sieve and sort, air-dry, grind, sieve, and set aside;

[0033] 2) The fine sand was treated with 1% H 2 SO 4 After cleaning, dry at 100°C for 24 hours to filter the bottom layer;

[0034] 3) Put the treated fine sand and garbage compost into the rinsing device, and use the mixture of ammonium sulfate and malonic acid for rinsing. After rinsing, let the rinsing solution stand for 48 hours; The ratio of parts by weight is 1:10.

[0035] 4) Rinse the compost with water again, collect the eluate, let stand after rinsing until there is no more eluent dripping out, leave it for 24 hours, then rinse the compost for the second time, rinse three times in total, and collect the eluate;

[0036] 5) combining the eluents collected in 3), 4) and performing digestion treatment to obtain powder;

[0037] 6) Dilute the obtained powder to volume with 1% dilute nitric acid, then measure the concentrations of various h...

Embodiment 2

[0038] Embodiment 2 (more detailed experimental process is as follows):

[0039] Materials: compost (dried), sand (washed with sulfuric acid, dried), PVC pipes, malonic acid, ammonium sulfate.

[0040] experimental design

[0041] Prepare:

[0042] Take 18 PVC pipes, seal one end with a cloth, weigh 20g of sand and pour them into the pipes, then weigh 110g of compost and pour them into the pipes. Label the 18 PVC pipes as follows: Control group: 3 were rinsed with water, and 3 were rinsed with ammonium sulfate. Experimental group: 3 rinsed with 20mmol / L malonic acid, 3 rinsed with 40mmol / L malonic acid, 3 rinsed with 20mmol / L malonic acid and ammonium sulfate mixture, 3 rinsed with 40mmol / L A mixture of malonic acid and ammonium sulfate.

[0043] Prepare eluent

[0044] 1) Preparation of 20mmol / L malonic acid: 20mmol malonic acid is needed per kilogram of compost, 2.2mmol malonic acid is needed for 110g compost, and 39ml solution is needed for 110g compost, and malonic ac...

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PUM

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Abstract

The invention discloses a method for removing heavy metals from waste compost by united elution using ammonium sulfate and malonic acid, mainly comprising the following steps: drying the domestic waste compost and carrying out elution on the domestic waste compost with mixed solution of the ammonium sulfate and the malonic acid, after elution, standing for 48h; carrying out elution with water every day in the same time and lasting for 2-3 times, collecting leacheate, filtering and carrying out digestion treatment and determining the change of the contents of such heavy metals as Cd, Cr, Cu, Ni, Pb and Zn in the solution; wherein, the ratio of the malonic acid of 20-40mmol / L to (NH4)2SO4 of lg / L is 1:1-2.5. The method of the invention belongs to the phase of mature development of elution technique and is used for technical support and preparation for pushing forward remediation work of national contaminated substrates.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a reasonable and safe use method of garbage composting. More specifically, it is a method for the combined leaching of ammonium sulfate and malonic acid to remove heavy metals in garbage compost. Background technique [0002] Heavy metal pollution has become one of the main contents of environmental pollution. The characteristic of heavy metal pollution is that it cannot be degraded and completely eliminated from the environment, but can only be transformed from one form to another, from high concentration to low concentration, and can accumulate and enrich in organisms. [0003] Municipal solid waste refers to solid and semi-solid waste generated in urban daily life or activities that provide services for urban daily life. The main components include kitchen waste, waste paper, waste plastics and brick and tile residue. Its main feature is complex composition an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05F9/04A62D101/43A62D3/30A62D3/33
CPCY02A40/20
Inventor 多立安赵树兰李光晶
Owner TIANJIN NORMAL UNIVERSITY
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