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Sludge hydrothermal humic acid generation regulation and heavy metal passivation method

A technology of humic acid and sludge water, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment through temperature control, etc., can solve mosquito breeding and long composting time (generally within 20 days) The above problems, such as large area, achieve the effect of reducing bioavailability, promoting the degree of humification, and achieving stable control

Active Publication Date: 2021-07-06
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compost humification is the humification process of organic matter under the action of microorganisms. It occupies a large area, has low fertilizer efficiency (incomplete conversion of humus), and takes a long time to compost (generally more than 20 days). In addition, the composting process is prone to odor. The air breeds mosquitoes, etc. These problems limit the widespread use of compost hum
Different from traditional compost humification, hydrothermal humification does not require microbial metabolism, and most of the carbon is directly combined to form humic acid without metabolism. Hydrothermal humification requires shorter time and occupies less land, which is suitable for rapid and efficient production Humic acid fertilizer, but the organic matter content of the sludge itself is limited, and the output of hydrothermal humic acid is limited, so it cannot be applied industrially

Method used

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  • Sludge hydrothermal humic acid generation regulation and heavy metal passivation method
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  • Sludge hydrothermal humic acid generation regulation and heavy metal passivation method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Pretreatment of municipal sludge: Take the remaining sludge from a sewage treatment plant in Wuxi, let it dry naturally for 48 hours, dry it at 105°C for 12 hours, and pass it through a 35-mesh molecular sieve after crushing; the industrial analysis value of the volatile content of the municipal sludge is greater than 45%;

[0025] (2) Pretreatment of the organic conditioner: the organic conditioner is subjected to low-temperature roasting treatment, the roasting temperature is 150° C., and the roasting time is 0.5 h; wherein the organic conditioner is a lignin-based organic conditioner;

[0026] (3) Get 4.0g municipal sludge, 1.0g organic conditioner, mix them evenly and add in the hydrothermal reaction kettle of 100mL capacity, add the sodium hydroxide solution of 70mL pH=8 (sodium hydroxide solution concentration is 10 -6 mol / L, the pH value is 8);

[0027] (4) Hydrothermal humification reaction: set the hydrothermal humification reaction temperature to 250°C, t...

Embodiment 2

[0030] The difference between this embodiment and specific example 1 is that the added amount of the organic conditioner is 0 g.

[0031] (1) Pretreatment of municipal sludge: Take the remaining sludge from a sewage treatment plant in Wuxi, let it dry naturally for 48 hours, dry it at 105°C for 12 hours, and pass it through a 35-mesh molecular sieve after crushing; the industrial analysis value of the volatile content of the municipal sludge is greater than 45%;

[0032] (2) Pretreatment of the organic conditioner: the organic conditioner is subjected to low-temperature roasting treatment, the roasting temperature is 150° C., and the roasting time is 0.5 h; wherein the organic conditioner is a lignin-based organic conditioner;

[0033] (3) Get 4.0g of municipal sludge, add it to a hydrothermal reaction kettle with a capacity of 100mL, add 70mL of sodium hydroxide solution with pH=8 (the concentration of sodium hydroxide solution is 10 -6 mol / L, the pH value is 8);

[0034] (...

Embodiment 3

[0037] The difference between this embodiment and the specific example 1 is that the hydrothermal humification reaction time is 2 hours.

[0038] (1) Pretreatment of municipal sludge: Take the remaining sludge from a sewage treatment plant in Wuxi, let it dry naturally for 48 hours, dry it at 105°C for 12 hours, and pass it through a 35-mesh molecular sieve after crushing; the industrial analysis value of the volatile content of the municipal sludge is greater than 45%;

[0039] (2) Pretreatment of the organic conditioner: the organic conditioner is subjected to low-temperature roasting treatment, the roasting temperature is 150° C., and the roasting time is 0.5 h; wherein the organic conditioner is a lignin-based organic conditioner;

[0040] (3) Get 4.0g municipal sludge, 1.0g organic conditioner, mix them evenly and add in the hydrothermal reaction kettle of 100mL capacity, add the sodium hydroxide solution of 70mL pH=8 (sodium hydroxide solution concentration is 10 -6 mol...

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Abstract

The invention discloses a sludge hydrothermal humic acid generation regulation and control and heavy metal passivation method, which comprises the following steps: adding municipal sludge and an organic conditioner into a hydrothermal reaction kettle according to a mass ratio of (3-4): 1, regulating the pH value with NaOH, adding water to fix the volume to 60-75% of that of a reaction container, converting the municipal sludge into a humic acid organic fertilizer under the conditions that the reaction temperature is 220-260 DEG C, the reaction pressure is 4-4.5 MPa and the residence time is 20-24 hours, and passivating heavy metals to reduce the bioavailability of the humic acid organic fertilizer; Through the organic conditioner, the yield of sludge hydrothermal humic acid is increased, adsorption and complexation of humic acid to heavy metal are promoted, the method has the advantages of being simple, practical, environmentally friendly, efficient, simple in process and low in cost, and a scientific theoretical basis is provided for sludge hydrothermal humic resource utilization.

Description

technical field [0001] The invention belongs to the field of solid waste recycling in environmental engineering, and specifically relates to an organic conditioner to increase the output of sludge hydrothermal humic acid and promote the passivation of heavy metals under hydrothermal humification conditions, in particular to a sludge hydrothermal humic acid regulation Formation and heavy metal passivation methods. Background technique [0002] With the development of urbanization and economy, the amount of sludge generated in our country is increasing year by year. Sludge is rich in organic matter, rich in nitrogen and phosphorus and other substances, and is often called "secondary resource". my country's sludge treatment and disposal should use resources as a means to develop and utilize energy and resources (organic matter, nitrogen and phosphorus, etc.) in sludge. While realizing the resource utilization of sludge energy, ensure the stabilization or Efficient removal. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/18C05F11/02C05G3/80C05G5/20C02F101/20
CPCC02F11/18C05F11/02C05G3/80C05G5/20C02F2101/20Y02A40/20
Inventor 郭飞宏刘占军姜小祥张居兵沈笛杨
Owner NANJING NORMAL UNIVERSITY
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