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Method for extracting humic acid liquid fertilizer with rich trace elements from sludge

A technology of trace elements and humic acid, which is applied in oxidation treatment of sludge, dehydration/drying/concentrated sludge treatment, organic fertilizer, etc., can solve the problems of soil heavy metal pollution, low fertilizer efficiency of products, and long secondary fermentation time, etc. Achieve significant reduction effect, improve soil physical properties, and promote the accumulation of sugar and dry matter

Inactive Publication Date: 2013-05-01
NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sludge aerobic composting has the characteristics of simple operation, low processing cost, and convenient land use; however, the secondary fermentation time of compost is long, the fertilizer efficiency of the product is low, and long-term application causes heavy metal pollution in the soil, so the quality of sludge fertilizer should be improved

Method used

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  • Method for extracting humic acid liquid fertilizer with rich trace elements from sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The main indicators of sludge in a sewage treatment plant are shown in Table 1.

[0019] Table 1 Main indicators of sludge in a sewage treatment plant

[0020] indicators

[0021] Place the sludge in a mixing tank, add 0.5mol / L nitric acid (0.2L / kg sludge) to it, stir at a speed of 5 rpm for 3 hours and then stir at a speed of 4000 rpm Centrifuge to collect the extract E1. Add 0.1 mol / L sodium hydroxide (addition amount is 1L / kg sludge) to the precipitation, stir and extract at a speed of 5 rpm for 6 hours, then centrifuge at a speed of 4000 rpm, collect the extract and record it as E2, Then add 0.1mol / L sodium hydroxide (addition amount is 1L / kg sludge) to adjust the precipitation, stir and extract at a speed of 5 rpm for 6 hours, then carry out high-pressure mechanical dehydration, collect the extract and record it as E3, dehydrated cake The moisture content is 38%. Mix E1 and E2, the measured content of humic acid in the mixed solution is 2.1%, and the c...

Embodiment 2

[0023] The main indicators of a paper mill sludge are shown in Table 2.

[0024] Table 2 The main indicators of a paper mill sludge

[0025] indicators

[0026] Place the sludge in a stirring tank, add 0.55mol / L nitric acid (0.3L / kg sludge) to it, stir at a speed of 5 rpm for 3 hours and then stir at a speed of 4000 rpm Centrifuge to collect the extract E1. Add 0.1mol / L sodium hydroxide (1.1L / kg sludge) to the precipitate, stir and extract at 5 rpm for 6 hours, then centrifuge at 4000 rpm, collect the extract and record it as E2 , and then add 0.1mol / L sodium hydroxide (addition amount is 1L / kg sludge) to adjust, and then carry out high-pressure mechanical dehydration after stirring and extracting at a speed of 5 rpm / min for 6 hours, collect the extract and record it as E3, and dehydrate The moisture content of the cake was 35%. Mix E1 and E2, the measured content of humic acid in the mixed solution is 2.9%, and the content of trace elements (Fe, Mn, Cu, Zn, Mo, B...

Embodiment 3

[0028] The main indicators of sludge in a sewage treatment plant are shown in Table 3.

[0029] Table 3 Main indicators of sludge in a sewage treatment plant

[0030] indicators

[0031] Place the sludge in a stirring tank, add 0.6mol / L nitric acid (0.15L / kg sludge) to it, stir at a speed of 5 rpm for 3 hours and then stir at a speed of 4000 rpm Centrifuge to collect the extract E1. Add 0.15mol / L sodium hydroxide (addition amount is 0.8L / kg sludge) to the sedimentation, stir and extract at 5 rpm for 6 hours, then centrifuge at 4000 rpm, collect the extract and record it as E2 , and then add 0.15mol / L sodium hydroxide (addition amount is 0.8L / kg sludge) to adjust, and then carry out high-pressure mechanical dehydration after stirring and extracting at a speed of 5 rpm / min for 6 hours. Collect the extract and record it as E3. The moisture content of the cement cake is 37%. Mix E1 and E2, the measured content of humic acid in the mixed solution is 2.0%, and the conte...

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Abstract

The invention discloses a method for extracting humic acid liquid fertilizer with rich trace elements from sludge. The method comprises the following steps: (1) adding nitric acid into the sludge, stirring for 3 hours, centrifugating, and collecting the extract E1; (2) adding sodium hydroxide to the residual precipitate in step (1), stirring to extract for 6 hours, centrifugating, and collecting the extract E2; (3) adding sodium hydroxide into the residual precipitate in step (2), stirring to extract for 6 hours, mechanically dehydrating under high pressure, and collecting the extract E3; and(4) and mixing E1 obtained in step (1) and E2 obtained in step (2), and concentrating the mixed solution to obtain the humic acid liquid fertilizer. The method not only can complete the further dehydration process of sludge so as to reduce the water content of sludge from about 80% to less than 40%, but also can effectively extract humic acid, trace elements and other necessary nutritional ingredients for plants from sludge.

Description

technical field [0001] The invention relates to the treatment and disposal technology of sewage plant sludge, and belongs to the technical field of solid waste treatment. Background technique [0002] With the improvement of my country's urban sewage treatment rate, the sludge output is gradually increasing, and the accompanying problem of sludge harmlessness is becoming more and more serious. Many sludges are piled up without treatment or after simple reduction treatment, which is far from reaching Sanitary landfill standards; this seriously weakens the purification effect of sewage treatment and causes serious secondary pollution to the environment. Because many pollutants in the sewage will enter the sludge, if the sludge of an urban sewage treatment plant is not properly treated, it will not only fail to fully play the role of eliminating pollution and protecting the environment, but will greatly weaken the function of sewage purification. Half the function of the sewage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/04C02F11/14C02F11/06C05F11/02C05G3/80
Inventor 朱英韩哲王绪科李静刘秀玉刘丰
Owner NEW MATERIAL INST OF SHANDONG ACADEMY OF SCI
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