Method for removing humic acid by limited catalytic flocculation to improve sludge liquid state fermentation acid production

A liquid fermentation, humic acid technology, applied in chemical instruments and methods, fermentation, pyrolysis treatment of sludge, etc., can solve the problem of large consumption of catalyst and light energy, etc., to achieve short ultraviolet light time, less secondary pollution, oxidation powerful effect

Active Publication Date: 2021-04-06
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the considered sludge hydrolyzate, the concentration of humic acid is very high, which is more than 500-1000 times that of natural water. If the traditional method is used, a large amount of expensive catalyst and light energy will be consumed

Method used

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  • Method for removing humic acid by limited catalytic flocculation to improve sludge liquid state fermentation acid production
  • Method for removing humic acid by limited catalytic flocculation to improve sludge liquid state fermentation acid production
  • Method for removing humic acid by limited catalytic flocculation to improve sludge liquid state fermentation acid production

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Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1 adopts the effect of the sludge liquid fermentation acid production after the method of the present invention

[0038] (1) Adjust the municipal sludge to a sludge concentration of 100g / L, and then perform thermal hydrolysis in a high-temperature and high-pressure reactor at a temperature of 180°C for 0.5h and a voltage of 75V to release the organic matter in the sludge into the liquid phase;

[0039] (2) The reactant obtained in step (1) is subjected to solid-liquid separation to remove inorganic and biologically refractory solid phase residues to obtain a sludge hydrolyzate containing high-concentration soluble organic matter. At this time, in the sludge hydrolyzate The zeta potential of humic acid is -3.0mV;

[0040] (3) In the sludge hydrolyzate obtained in step (2), add TiO in an amount of 300 mg per L of sludge hydrolyzate 2 , after stirring evenly, irradiate with ultraviolet light, the output power of ultraviolet light is 10W, and the irradiation ti...

Embodiment 2

[0045] (1) Adjust the municipal sludge to a sludge concentration of 50g / L, and then perform thermal hydrolysis in a high-temperature and high-pressure reactor at a temperature of 140°C for 0.5h and a voltage of 75V to release the organic matter in the sludge into the liquid phase;

[0046] (2) The reactant obtained in step (1) is subjected to solid-liquid separation to remove inorganic and biologically refractory solid phase residues to obtain a sludge hydrolyzate containing high-concentration soluble organic matter. At this time, in the sludge hydrolyzate The zeta potential of humic acid is -2.0mV;

[0047] (3) In the sludge hydrolyzate obtained in step (2), add TiO in an amount of 50 mg per L of sludge hydrolyzate 2 , after stirring, irradiate with ultraviolet light, the output power of ultraviolet light is 10W, and the irradiation time is 3.0h. At this time, the zeta potential of humic acid in the sludge hydrolyzate is -20.0mV;

[0048] (4) In the system of step (3), add ...

Embodiment 3

[0052] (1) Adjust the municipal sludge to a sludge concentration of 150g / L, and then perform thermal hydrolysis in a high-temperature and high-pressure reactor at a temperature of 220°C for 0.5h and a voltage of 100V to release the organic matter in the sludge into the liquid phase;

[0053] (2) The reactant obtained in step (1) is subjected to solid-liquid separation to remove inorganic and biologically refractory solid phase residues to obtain a sludge hydrolyzate containing high-concentration soluble organic matter. At this time, in the sludge hydrolyzate The zeta potential of humic acid is -10.0mV;

[0054] (3) In the sludge hydrolyzate obtained in step (2), add TiO in an amount of 300 mg per L of sludge hydrolyzate 2 , after stirring evenly, irradiate with ultraviolet light, the output power of ultraviolet light is 20W, and the irradiation time is 3.0h. At this time, the zeta potential of humic acid in the sludge hydrolyzate is-35mV;

[0055] (4) In the system of step (...

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Abstract

The invention discloses a method for improving sludge liquid fermentation acid production by removing humic acid through limited-quantity catalytic flocculation, and belongs to the field of sludge treatment. The method comprises the following steps: adjusting municipal sludge to a certain concentration, then carrying out pyrohydrolysis in a high-temperature and high-pressure reaction kettle, and releasing organic matters in the sludge into a liquid phase; carrying out solid-liquid separation to obtain sludge hydrolysate containing high-concentration soluble organic matters; adding TiO2, irradiating by utilizing ultraviolet light, stopping irradiating when the zeta potential of humic acid in the sludge hydrolysate is 30.0-20.0 mV, carrying out chemical flocculation by using CaCl2, carrying out solid-liquid separation to remove precipitates, and carrying out liquid state fermentation on supernatant to produce acid. According to the method, anaerobic fermentation acid production of the sludge can be promoted to the maximum extent, and the problems of low acid production efficiency, high cost, low resource utilization efficiency and the like of existing hydrolysate liquid state fermentation are solved; the concentration of the soluble humic acid is reduced by 65%-70%, and the total acid production efficiency is obviously improved.

Description

technical field [0001] The invention relates to a limited amount catalytic flocculation method for removing humic acid and improving sludge liquid fermentation acid production, which belongs to the field of sludge treatment. Background technique [0002] The environmentally friendly concept of turning wastewater treatment plants towards "carbon neutrality" is attracting a lot of attention these days. Therefore, the method of obtaining organic energy from surplus sludge has brought anaerobic digestion back into popularity again. Although anaerobic digestion can convert residual sludge into organic energy relatively easily, due to the rate-limiting step in the hydrolysis stage, and the stable structure of refractory organic substances such as lignocellulosic substances and humic substances contained in sludge, The conversion efficiency of anaerobic digestion is relatively low. [0003] At present, thermal hydrolysis has been widely used to improve the performance of sludge a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C02F9/08C12P7/40C02F101/30
CPCC02F11/10C02F9/00C12P7/40C02F2101/30C02F1/32C02F1/5236
Inventor 刘和刘宏波黄芳符波郑志永崔敏华张衍
Owner JIANGNAN UNIV
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