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Method of preparing humic acid by biological sludge composting

A bio-sludge and humic acid technology, applied in the direction of fermentation, can solve the problems of high pharmaceutical cost, high operating cost, long use time, etc., and achieve the effect of good market value

Inactive Publication Date: 2014-08-13
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as the patents of aerobic composting of sludge are concerned, most of them need to add fermentation bacteria and turn the compost regularly, the operation cost is high and it takes a long time. Metal ions, and then use sodium pyrophosphate to extract the alkali-dissolved acid precipitation treatment process, the cost of the medicament is high and there is a pollution problem of organic reagents

Method used

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  • Method of preparing humic acid by biological sludge composting
  • Method of preparing humic acid by biological sludge composting
  • Method of preparing humic acid by biological sludge composting

Examples

Experimental program
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Embodiment 1

[0026] Get 10kg of dewatered sludge and 6kg of fallen leaves with a water content of 15% to mix, the water content of the mixed material reaches 55.6%, and the carbon-nitrogen ratio (C / N) reaches 26.3. Put the mixed materials evenly into the aerobic fermentation tank, and provide air to the pile through the aeration system at the bottom of the fermentation tank. 3 / (h·m 3 Stacking) to adjust the air volume. The outlet gas is collected by the air guide tube, and then passes through the condensation device and the gas collection device respectively equipped with 10% NaOH and 0.1mol / L HCl absorption liquid, and then empties after purification. After 45 to 60 days of fermentation and decomposing, the decomposed fertilizer samples are naturally air-dried, pulverized by a pulverizer and sieved, and the under-sieve is used as the raw material for humic acid extraction.

[0027] Take 15g of humic acid extraction raw material, put it into a 250ml Erlenmeyer flask, add 150ml of 10% di...

Embodiment 2

[0029] Composting process is with embodiment 1. The humic acid extraction and separation process is similar to Example 1. The difference is that the solid-liquid ratio of alkali extraction is 1:9, the extraction temperature is 80°C, and the extraction time is 100min. The product quality of humic acid was 2.6045g, and the recovery rate of humic acid was 40.63%.

Embodiment 3

[0031] Composting process is with embodiment 1. The humic acid extraction and separation process is similar to Example 1. The difference is that the solid-liquid ratio of alkali extraction is 1:10, the extraction temperature is 90°C, and the extraction time is 110 minutes. The product quality of humic acid was 2.6032g, and the recovery rate of humic acid was 43.19%.

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Abstract

The invention discloses a method of preparing humic acid by biological sludge composting. Biological sludge which is large in output in China but not effectively disposed is adopted as a raw material and prepared into the humic acid by utilization of aerobic composting. A humic acid crude product is separated and extracted by processes of pretreatment with hydrochloric acid, dissolution with an alkali, and acid precipitation. Though the aerobic compositing, the content of the humic acid in a decomposed fertilizer in the dry basis is 36.65%, which is superior to that of a low-content coal resource. The humic acid crude product is separated and prepared by dissolution with an alkali and acid precipitation. The recovery rate of the humic acid can reach 46.78%. The abovementioned information verifies the effectiveness of the method. The method facilitates solution of the problems of environment pollution and high investment which are caused by landfill and burning of dewatered sludge in China, and can also produce a humic acid product with a good marketing value. The humic acid product can be used for fields of storage batteries, dry farming, traditional Chinese medicines, cosmetics, barren hill greening, urban beautification, and the like.

Description

technical field [0001] The invention relates to a method for preparing humic acid by composting biological sludge, belonging to the field of solid waste treatment and resource utilization. Background technique [0002] With the acceleration of urbanization and population growth, the amount of sewage treatment is also increasing year by year. As of the end of the third quarter of 2011, my country has built 3,078 sewage treatment plants with a total sewage treatment capacity of 136 million tons / day. By the end of June 2012, my country had 3,272 urban sewage treatment plants with a treatment capacity of 140 million tons / day. Along with the increase in the amount of sewage treatment, there is also the output of biological sludge. At the end of the 12th Five-Year Plan, the annual output of dewatered sludge in my country will exceed 26 million tons. Biological sludge is the sediment produced in the sewage purification process of urban sewage treatment plants. It is an extremely c...

Claims

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Application Information

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IPC IPC(8): C12P1/00
Inventor 刘勇郭祥辛世纪
Owner TIANJIN UNIV
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