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Graded purifying method of humic acid subfractions in sludge and straw mixed compost

A technology of fractional purification and humic acid, applied in organic chemistry and other directions, can solve the problems of complex system and difficult extraction technology.

Inactive Publication Date: 2016-12-14
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The finished compost system includes not only minerals in sludge, but also animal and plant residues. The system is complex, and the HA extraction technology is difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] In this example, the humic acid subcomponents in the compost of sludge and straw of a sewage treatment plant were extracted by stages. First, the sludge treated by a sewage treatment plant (discharged up to the standard) was selected, and the water content, N, and N of the sludge were monitored. P, heavy metals, etc. content, record the data), and mix it with straw with a length of 3cm-5cm, including the following steps:

[0084] a. Preparation process of mixed compost of sludge and straw

[0085] a1. Select the sludge treated by the sewage treatment plant and monitor the water content, N, P, heavy metal and organic content of the sludge; cut the plant straw to make the straw length 4cm;

[0086] a2. Place the sludge and straw in a commercially available composting reactor according to a weight ratio of 1:1, stir and stir to ensure that the initial water content is 50-70%;

[0087] a3. In the composting stage, the mixed sample after composting is obtained. The time period is 10...

Embodiment 2

[0118] A method for classification and purification of humic acid subcomponents in sludge and straw mixed compost, characterized in that the method comprises the following steps:

[0119] a. Preparation process of mixed compost of sludge and straw

[0120] a1. Select the sludge that meets the standards after treatment in the sewage treatment plant, and monitor the water content, N, P, heavy metal and organic content of the sludge; cut the plant straw to make the straw length 3cm-5cm;

[0121] a2. Place the sludge and straw in a commercially available composting reactor according to the weight ratio of 1:(1-2), stir and stir to ensure that the initial water content is 50%-70%, if the water content is less than 50 %, carry out water treatment; if the water content is higher than 70%, carry out drying treatment;

[0122] a3. Carry out the composting stage to obtain the composted mixed sample, the time period is 100-130d. During the composting period, the temperature of the pile is measur...

Embodiment 3

[0147] A method for classification and purification of humic acid subcomponents in sludge and straw mixed compost, characterized in that the method comprises the following steps:

[0148] a. Preparation process of mixed compost of sludge and straw

[0149] a1. Select the sludge that meets the standards after treatment in the sewage treatment plant, and monitor the water content, N, P, heavy metal and organic content of the sludge; cut the plant straw to make the straw length 3cm;

[0150] a2. Place the sludge and straw in a commercially available composting reactor according to the weight ratio of 1:2, stir and turn evenly to ensure that the initial water content is 50%-70%, if the water content is less than 50%, add water Treatment; if the water content is higher than 70%, carry out drying treatment;

[0151] a3. Perform the composting phase to obtain the mixed sample after composting. The time period is 130d. During the composting period, the temperature of the pile is measured ever...

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Abstract

The invention discloses a graded purifying method of humic acid subfractions in sludge and straw mixed compost. The method includes the following steps of a, the separation, extraction and purification process of humic acid (HA) in the sludge and straw mixed compost, wherein a humic acid coarse product in the sludge and straw mixed compost is separated and extracted, and a humic acid sample is obtained after dialysis and freeze-drying; b, the graded extraction process of humic acid (HA) in the sludge and straw mixed compost, wherein an adsorption enrichment column is leached through NaNO3 leaching solutions with five different pH values being 3, 5, 7, 9 and 13 through the adsorption performance of an XAD-8 resin and activated carbon mixed adsorption enrichment column to obtain the corresponding humic acid subfractions under different pH values. The new method is provided for obtaining the humic acid subfractions through separation and graded extraction in the sludge and straw mixed compost.

Description

Technical field [0001] The invention belongs to the technical field of separation and extraction of organic matter, and specifically relates to a method for classification and purification of humic acid subcomponents in mixed compost of sludge and straw. Background technique [0002] The composting of sludge and straw is an important way to achieve harmlessness and recycling of solid waste, which can not only effectively realize waste reuse, but also reduce environmental pollution caused by sludge waste. The finished compost of sludge and straw can be used as nutrients and amendments for soil cultivation, thereby maintaining and improving soil fertility and productivity, achieving the purpose of turning harm into benefit, comprehensive utilization, and protecting the environment. [0003] Humus is an important component in the finished compost of sludge and straw, and the formation and transformation degree of humus in the compost is an important index for evaluating the finished c...

Claims

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Application Information

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IPC IPC(8): C08H99/00C07G99/00
CPCC08H99/00C07G99/00
Inventor 吴丰昌白英臣宋凡浩陈曲刘沙沙冯伟莹
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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