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A method for biological two-stage harmless treatment of domestic sludge to improve saline-alkali land

A technology of harmless treatment and domestic sludge, applied in the directions of microbial treatment, biological sludge treatment, biological organic part treatment, etc., can solve the problems of difficult harmless treatment and resource utilization, etc. The effect of chemical utilization on improving saline-alkali land

Active Publication Date: 2022-03-25
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Purpose of the invention: The present invention provides a biological "two-stage" harmless sludge for a series of practical problems such as large domestic sludge output, both "resource" and "pollution" attributes, difficult to harmless treatment and resource utilization, etc. Method for chemically treating domestic sludge to improve saline-alkali land

Method used

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  • A method for biological two-stage harmless treatment of domestic sludge to improve saline-alkali land
  • A method for biological two-stage harmless treatment of domestic sludge to improve saline-alkali land
  • A method for biological two-stage harmless treatment of domestic sludge to improve saline-alkali land

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The method of obtaining the harmless product of domestic sludge: adopt the method of biological two-stage harmless treatment of domestic sludge, that is, the first step is to use earthworms odorless to digest domestic sludge in the first stage to obtain a mixture of excess sludge and vermicompost, and then inoculate EM bacteria compost fully fermented the mixture of excess sludge and vermicompost to obtain a harmless product (F3).

[0034]First, pile the domestic sludge into 50 long stacks with a height of 25-30cm, a width of 40-50cm, and a length of 3.0-3.5m, and each stack is separated by 20-30cm; The interval between entering the piles; the whole earthworm working bed is covered with a 3-5cm thick working earthworm and vermicompost mixture, and after 6-8 days of digestion, the earthworms are collected by artificial light-shielding method to obtain the remaining sludge and vermicompost mixture.

[0035] Next, pile the excess sludge and vermicompost mixture into a long...

experiment example 1

[0041] The domestic sludge harmless products F3, F1, F2 obtained in Example 1, Comparative Example 1 and Comparative Example 2 were determined according to the indicators specified in the "Standard for the Control of Pollutants for Agricultural Sludge" (GB4284-2018), and the relevant indicators were determined. . Moisture content was determined by gravimetric method, pH was determined by glass electrode method, organic matter content was determined by potassium dichromate volumetric method, Ascaris egg mortality was determined by microscope method, and fecal coliform bacteria value was determined by fermentation method.

[0042] Table 1 Determination of the relevant characters of the harmless products of the tested domestic sludge

[0043]

[0044] The research shows that the above items of the harmless product F3 of domestic sludge all meet the indicators stipulated in the "Standards for Pollutant Control of Agricultural Sludge" (GB4284-2018). However, the moisture conten...

experiment example 2

[0046] The domestic sludge harmless products F3, F1, F2 obtained in Example 1, Comparative Example 1 and Comparative Example 2 were used for the study of improving saline-alkali soil, in Fangling Reclamation District, Bancha Town, Nantong City, Jiangsu Province in 2016. test field. The test area belongs to the subtropical humid monsoon climate, the total rainfall during the test period was 100.9mm, and the average temperature was 12.5℃.

[0047] The field randomized block test was used in the experiment, and the area of ​​each plot was 3.6m×3.6m. Test according to 2.0 tons mu -1 (Dry basis) The harmless products of domestic sludge (F3, F1, F2) were applied at the dosage, and each treatment was repeated 3 times. In June 2016, the harmless products of domestic sludge (F3, F1, F2) were applied to each experimental plot, and each material was mixed with 0-20cm ploughed soil by a rotary tiller. Ascaris egg detection.

[0048] Studies have shown that live Ascaris eggs were detec...

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Abstract

The invention discloses a biological two-stage harmless treatment method for domestic sludge. The first choice is to use earthworms to digest the domestic sludge in the first stage of odorless to obtain a mixture of excess sludge and vermicompost; inoculate EM bacteria compost and ferment the mixture of excess sludge and vermicompost to obtain Harmless product. The invention also discloses a method for biological two-stage harmless treatment of domestic sludge to improve saline-alkali land, which effectively solves the problem of improving saline-alkali land through the harmless treatment of domestic sludge: screening of those that meet the requirements of the "Agricultural Sludge Pollutant Control Standard" (GB4284-2018) The domestic sludge with heavy metal limit standards ensures the safety of the heavy metal environment for agricultural use of sludge; the two-stage treatment of earthworms and EM bacteria staggers the efficient action time of earthworms and EM bacteria to give full play to the advantages of both; ensures that the harmless products of domestic sludge can It meets all the standards stipulated in the "Agricultural Sludge Pollutant Control Standards" (GB4284‑2018), so as to realize the resource utilization of harmless domestic sludge products to improve saline-alkali land.

Description

technical field [0001] The invention relates to the technology of harmless treatment and resource utilization of domestic sludge, in particular to a biological (earthworm, EM bacteria) "two-stage" harmless treatment of domestic sludge and a method for improving saline-alkali land. Background technique [0002] my country's urban sewage treatment industry has developed rapidly. As of 2018, nearly 7,000 urban sewage treatment plants have been built in my country, with a sewage treatment capacity of 1.5×10 9 m 3 .d -1 , the annual cumulative sewage treatment volume reached 4.50 × 10 11 m 3 . In the process of sewage treatment, a large amount of domestic sludge with complex components will be produced. In 2018, the wet sludge (calculated with a moisture content of 80%) of the national sewage treatment plants produced nearly 50 million tons, and it is expected that the sludge output will exceed 60 million tons by 2020. . [0003] Domestic sludge has both "resource" and "pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/60B09B5/00B09C1/08C02F11/02C05F15/00C05F17/20C05G3/80
CPCB09B3/00B09B5/00B09C1/08C02F11/02C05F3/00B09C2101/00Y02W30/40
Inventor 柏彦超张文杰汤泽辉吕铭左文刚单玉华
Owner YANGZHOU UNIV
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