Application of acetic acid or acetic acid and ammonium sulfate for removing heavy metals in garbage compost

A waste composting and heavy metal technology, applied in organic fertilizers, climate change adaptation, etc., can solve secondary pollution and other problems, and achieve the effect of simple operation, wide application prospects, and remarkable rinsing effect

Inactive Publication Date: 2013-02-27
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] 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 acetic acid combined leaching to remove heavy metals in garbage compost, and understand the leaching effect of acetic acid at the same time. What about its leaching effect as the concentration increases, how the synergy of acetic acid and ammonium sulfate can remove heavy metals, etc., to achieve the purpose of safe, effective and reasonable use of municipal solid waste composting, in order to achieve the above-mentioned purpose, the present invention provides the following Technical method:

Method used

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  • Application of acetic acid or acetic acid and ammonium sulfate for removing heavy metals in garbage compost
  • Application of acetic acid or acetic acid and ammonium sulfate for removing heavy metals in garbage compost
  • Application of acetic acid or acetic acid and ammonium sulfate for removing heavy metals in garbage compost

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Compost the household garbage containing heavy metal pollution, sieve and sort, air-dry, grind, sieve, and set aside;

[0036] 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;

[0037] 3) Put the treated fine sand and garbage compost into the rinse device, rinse with ammonium sulfate and acetic acid mixture, after the rinse, leave the rinse for 48 hours; the weight of the compost and the mixture The ratio of parts and numbers is 1:10; wherein the ratio of parts and weights of ammonium sulfate and acetic acid mixed solution is: 40mmol / L acetic acid: 1g / L (NH 4 ) 2 SO 4 =1:2.5.

[0038] 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;

[0039] 5) combining the eluents collected in 3), 4) and performing d...

Embodiment 2

[0042] 1) Compost the household garbage containing heavy metal pollution, sieve and sort, air-dry, grind, sieve, and set aside;

[0043] 2) Wash the fine sand with 1% H2SO4 and dry it at 100°C for 24 hours to filter the bottom layer;

[0044] 3) Put the processed fine sand and garbage compost into the rinse device, rinse with 40mmol / l acetic acid, after the rinse is completed, leave the rinse solution for 48 hours; wherein the ratio by weight of acetic acid to compost is It is 1:2-10.

[0045] 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;

[0046] 5) combining the eluents collected in 3), 4) and performing digestion treatment to obtain powder;

[0047] 6) Dilute the obtained powder to volume with 1% dilute nitric acid, then measure the concentration of various heavy metals

Embodiment 3

[0048] Embodiment 3 (more detailed experimental process is as follows):

[0049] Experimental Materials

[0050] Garbage composting treatment: drying at 100°C for 24 hours; fine sand: 1% H 2 SO 4 Dry at 100°C for 24 hours after cleaning. PVC pipe: 1.5CM in diameter, 20CM in height; a total of 18 pipes are numbered 1 to 3 in each group and sealed with cloth. Compost filling: Weigh 20g of fine sand at the bottom of the washing tube, then fill with 110g of compost, a total of 18 sticks. Weighing: Weigh the weight of 18 plastic bottles that will contain the filtrate.

[0051] experimental drug

[0052] Acetic acid: 17.6Mol / L; HNO 3 ; (NH 3 ) 4 SO 4 ;perchloric acid

[0053] Table 1 Eluent formula

[0054] eluent

Acetic acid (ml)

Ammonium sulfate (g)

20mmol / l acetic acid

1.3636

0

40mmol / l acetic acid

2.2727

0

20mmol / l acetic acid+(NH 3 ) 4 SO 4

1.3636

0.5186

40mmol / l acetic acid+(NH 3...

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Abstract

The invention discloses an application of acetic acid or acetic acid and ammonium sulfate for removing heavy metals in garbage compost, wherein, the method of the application is as follows: drying household garbage compost, and then leaching the household garbage compost by 40mmol / L of acetic acid or the mixing solution of 20-40mmol / L acetic acid: 1g / L (NH4)2SO4 being equal to 1:1-2.5, stewing for 48h after the completeness of leaching, wherein, the ratio of parts by weight of acetic acid and the compost is 1:2-10 and the ratio of parts by weight of compost and mixing solution is 1:2-15; leaching the compost continuously for 2 to 3 times at the same time every day, combining collected leacheate to carry out digestion treatment, and measuring the content changes of heavy metals such as Cd, Cr, Cu, Ni, Pb, Zn in the solution. The invention utilizes the method that uses 40mmol / L acetic acid or the combination of ammonium sulfate and acetic acid to carry out leaching to remove the heavy metals in the garbage compost, and the method is mature development of leaching technology and prepares technical support for promoting the restoring work of contaminated matrixes in China.

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 removing heavy metals in garbage compost by combined leaching with ammonium sulfate and acetic acid. Background technique [0002] Currently, there are three internationally accepted waste disposal methods: sanitary landfill, composting and incineration. Among them, waste incineration power generation has become a relatively common waste resource treatment method in developed countries. However, waste incineration power generation requires three conditions. First, the calorific value of waste must reach more than 4,200 kilojoules per kilogram before it can be burned. Second, the amount of waste generated must reach more than 600 tons per day. Because less than 600 tons, waste incineration cannot generate electricity. , cannot produce electricity stably, and again, the one...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05F9/04
CPCY02A40/20
Inventor 多立安赵树兰孙建国
Owner TIANJIN NORMAL UNIVERSITY
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