CN107117785B - Method for promoting hydrolysis of sludge to release soluble organic matters - Google Patents

Method for promoting hydrolysis of sludge to release soluble organic matters Download PDF

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CN107117785B
CN107117785B CN201710429728.XA CN201710429728A CN107117785B CN 107117785 B CN107117785 B CN 107117785B CN 201710429728 A CN201710429728 A CN 201710429728A CN 107117785 B CN107117785 B CN 107117785B
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sludge
mixed
mass
organic matters
urea
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CN107117785A (en
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陈银广
郑雄
余同
郭敏
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Tongji University
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C02F11/04—Anaerobic treatment; Production of methane by such processes

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Molecular Biology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Sludge (AREA)

Abstract

The invention relates to the technical field of environmental protection, and discloses a method for promoting hydrolysis of sludge to release soluble organic matters, which comprises the following steps: respectively taking primary sludge and excess sludge of a sewage treatment plant to form mixed sludge, wherein the mass ratio of the primary sludge to the excess sludge is 10: 1-1: 10; adding urea and alkali into the mixed sludge, wherein the mass of the added urea is less than 15% of that of the mixed sludge, and the mass of the added alkali is less than 15% of that of the mixed sludge; pre-cooling for 0.5-3 hours at 0-5 ℃; in the precooling process, anaerobic stirring is carried out on the sludge, the stirring speed is 20-150 rpm, and the dissolution of organic matters is increased. According to the invention, through adding alkali and urea and then precooling treatment, cell breaking of sludge and dissolution of organic matters are greatly promoted, abundant substrates can be provided for anaerobic fermentation of sludge, and resource utilization of sludge is realized.

Description

Method for promoting hydrolysis of sludge to release soluble organic matters
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a method for greatly promoting hydrolysis of sludge to release organic matters.
Background
The activated sludge process is a biological sewage treatment technology widely used at present, and can remove nitrogen and phosphorus while removing organic matters. In particular, primary sludge refers to sludge discharged from a primary sedimentation tank of a sewage treatment plant, and excess sludge refers to activated sludge discharged from a secondary sedimentation tank (or sedimentation zone) outside the system in an activated sludge system. The activated sludge has the characteristics of high water content, high organic component content, complex components and the like, and if the activated sludge cannot be effectively treated, secondary pollution is easily caused. In stabilization, recycling and harmless treatment of sludge, anaerobic digestion is widely used for treatment of activated sludge due to its advantages of low energy consumption, capability of generating a large amount of energy, and the like.
The sludge can be converted into resources such as organic acid, hydrogen, methane and the like through an anaerobic fermentation process. The anaerobic fermentation of the sludge is divided into three stages of hydrolysis, acidification and methanation. Many documents prove that the hydrolysis of the sludge is a limiting step of anaerobic fermentation of the sludge, and whether the sludge can be further effectively recycled depends on the dissolution of a substrate in a hydrolysis stage. Therefore, in order to realize the recycling of sludge, it is necessary to hydrolyze the particulate organic matter of sludge first and release the soluble organic matter that can be utilized by microorganisms.
Disclosure of Invention
The invention aims to provide a method for promoting hydrolysis of sludge to release soluble organic matters, which can greatly promote cell breaking of the sludge and dissolution of the organic matters, provide rich substrates for anaerobic fermentation of the sludge and realize resource utilization of the sludge.
In order to solve the problems, the invention provides a method for promoting hydrolysis of sludge to release soluble organic matters, which comprises the following steps:
(1) respectively taking primary sludge and excess sludge of a sewage treatment plant to form mixed sludge, wherein the mass ratio of the primary sludge to the excess sludge in the mixed sludge is 10: 1-1: 10;
(2) adding urea and alkali (NaOH, KOH or Ca (OH)) into the mixed sludge in the step (1)2) The mass of the added urea is less than 15% of the mass of the mixed sludge, and the mass of the added alkali is less than 15% of the mass of the mixed sludge;
(3) pre-cooling the mixed sludge treated in the step (2) for 0.5-3 hours at the temperature of 0-5 ℃; in the precooling process, anaerobic stirring is carried out on the sludge, the stirring speed is 20-150 rpm, and the dissolution of organic matters is increased.
According to the sludge pretreatment method provided by the invention, alkali and urea are added, and precooling treatment is carried out, so that cell breaking of sludge and dissolution of organic matters are greatly promoted, abundant substrates can be provided for anaerobic fermentation of sludge, and resource utilization of sludge is realized. Firstly, the invention promotes the dissolution of the sludge substrate through the combined action of alkali and urea, increases the content of soluble protein and sugar in the solution, and provides rich substrate for the fermentation process. Secondly, after the pretreatment of alkali and urea, the breaking of sludge flocs leads to the enhancement of sludge dewatering property, thereby being beneficial to the subsequent treatment of sludge residues.
In particular, although addition of alkali is advantageous for breaking cells of sludge and increasing elution of polysaccharide organic substances, the acceleration of elution of protein organic substances is limited. The solubility of protein in water is limited, and urea can obviously increase the solubility of protein, but urea does not obviously promote the cell-breaking process. By utilizing the method provided by the invention, when the alkali and the urea are added simultaneously, the alkali can destroy hydrogen bonds, the urea can stabilize the hydrophobic part of the sludge, the sludge floc structure can be destroyed by the synergistic effect of the alkali and the urea, the cell breaking of the mixed sludge and the dissolution of various organic matters are facilitated, and the sludge hydrolysis effect of single alkali or urea addition is obviously improved. Compared with sludge hydrolysis processes such as high-temperature pyrohydrolysis, microwave, ultrasonic wave and the like, the method has the advantages of simple process, low energy consumption, no need of complex equipment, simple and convenient operation, high hydrolysis effect efficiency and the like.
Advantageously, in the step (1), the mass ratio of the primary sludge and the excess sludge in the mixed sludge is preferably 1: 1.
Advantageously, in the step (2), the mass of the urea added to the mixed sludge is preferably 10% of the mass of the mixed sludge.
Advantageously, in the step (2), the mass of the alkali added to the mixed sludge is preferably 10% of the mass of the mixed sludge.
Advantageously, in the step (3), the pre-cooling time is preferably 1 hour.
Advantageously, in step (3), the stirring speed for anaerobic stirring of the sludge is preferably 100 rpm.
The primary sludge contains more polysaccharide organic matters and the residual sludge contains more protein organic matters. When the mass ratio of the primary sludge to the excess sludge is 1:1, the polysaccharide and the protein reach balance, and the hydrolysis of the primary sludge and the excess sludge is mutually promoted. The hydrolysis of the mixed sludge is facilitated by increasing the urea and alkali, but when the urea addition is more than 10% and the alkali addition is more than 10%, the hydrolysis effect is not obviously enhanced. The precooling time is increased to be beneficial to hydrolysis of the mixed sludge, but the precooling time is more than 1 hour, so that the hydrolysis effect is not obviously enhanced. The mixing intensity is beneficial to the hydrolysis process of the mixed sludge, when the stirring speed is lower than 100rpm, the sludge can not be completely mixed, the increase of the stirring speed is beneficial to the hydrolysis of the mixed sludge, but the stirring speed is higher than 100rpm, so that the hydrolysis effect is not obviously enhanced. Therefore, under the optimal conditions, the mixed sludge is hydrolyzed to dissolve out the organic matters to the optimal value, and the energy consumption and the medicine adding amount are saved under the condition of ensuring the hydrolysis effect.
Detailed Description
The present invention will be described in further detail with reference to the following examples.
Example 1
1 kg of primary sludge and 1 kg of excess sludge (the mass ratio of the primary sludge to the excess sludge is 1: 1) of a sewage treatment plant were taken to constitute mixed sludge for the treatment of the present example. Adding 10% of urea and 10% of NaOH into the mixed sludge, then precooling the sludge for 1 hour at 4 ℃, and in the precooling process, carrying out anaerobic stirring on the sludge at the stirring speed of 100rpm to increase the dissolution of organic matters.
The mixed sludge was treated according to the method of example 1 above in comparison with the original surplus sludge without any added substances:
the content of soluble organic substances, mainly sugars and proteins, was determined after treatment of the mixed sludge according to the method of example 1 above. Basic properties of the sludge: total suspended solid particles TSS =20 g/L; the volatile component accounts for 70% of the specific gravity VSS/TSS =.
Blank control (no treatment): soluble sugar concentration: 12 mg/L, soluble protein 185 mg/L
Sludge treated by the method of example 1 above: soluble sugar concentration: 1257 mg/L, soluble protein 6328 mg/L.
Example 2
1 kg of primary sludge and 1 kg of excess sludge (the mass ratio of the primary sludge to the excess sludge is 1: 1) of a sewage treatment plant were taken to constitute mixed sludge for the treatment of the present example. Adding 10% of NaOH and 10% of urea into the mixed sludge, then precooling the sludge for 2 hours at 4 ℃, and in the precooling process, carrying out anaerobic stirring on the sludge at the stirring speed of 100rpm to increase the dissolution of organic matters.
Sludge treated by the method of example 2 above: soluble sugar concentration: 1272 mg/L, soluble protein 6340 mg/L.
Example 3
1 kg of primary sludge and 1 kg of excess sludge (the mass ratio of the primary sludge to the excess sludge is 1: 1) of a sewage treatment plant were taken to constitute mixed sludge for the treatment of the present example. Adding 10% of NaOH and 10% of urea into the mixed sludge, then precooling the sludge for 0.5 hour at 4 ℃, and in the precooling process, carrying out anaerobic stirring on the sludge at the stirring speed of 100rpm to increase the dissolution of organic matters.
Sludge treated by the method of example 3 above: soluble sugar concentration: 783 mg/L and soluble protein 4158 mg/L.
Example 4
1 kg of primary sludge and 1 kg of excess sludge (the mass ratio of the primary sludge to the excess sludge is 1: 1) of a sewage treatment plant were taken to constitute mixed sludge for the treatment of the present example. Adding 10% of NaOH and 10% of urea into the mixed sludge, then precooling the sludge for 1 hour at 4 ℃, and in the precooling process, carrying out anaerobic stirring on the sludge at the stirring speed of 20rpm to increase the dissolution of organic matters.
Sludge treated by the method of example 4 above: soluble sugar concentration: 537 mg/L, soluble protein 3759 mg/L.
Example 5
1 kg of primary sludge and 1 kg of excess sludge (the mass ratio of the primary sludge to the excess sludge is 1: 1) of a sewage treatment plant were taken to constitute mixed sludge for the treatment of the present example. Adding 5% of NaOH and 5% of urea into the mixed sludge, then precooling the sludge for 1 hour at 4 ℃, and in the precooling process, carrying out anaerobic stirring on the sludge at the stirring speed of 100rpm to increase the dissolution of organic matters.
Sludge treated by the method of example 5 above: soluble sugar concentration: 961 mg/L, soluble protein 5887 mg/L.
Example 6
1 kg of primary sludge and 1 kg of excess sludge (the mass ratio of the primary sludge to the excess sludge is 1: 1) of a sewage treatment plant were taken to constitute mixed sludge for the treatment of the present example. Adding 15% of NaOH and 15% of urea into the mixed sludge, then precooling the sludge for 1 hour at 4 ℃, and in the precooling process, carrying out anaerobic stirring on the sludge at the stirring speed of 100rpm to increase the dissolution of organic matters.
Sludge treated by the method of example 6 above: soluble sugar concentration: 1339mg/L, soluble protein 6497 mg/L.
Example 7
10 kg of primary sludge and 1 kg of excess sludge (the mass ratio of the primary sludge to the excess sludge is 10: 1) of the sewage treatment plant were taken to constitute mixed sludge for the treatment of the present example. Adding 10% of NaOH and 10% of urea into the mixed sludge, then precooling the sludge for 1 hour at 4 ℃, and in the precooling process, carrying out anaerobic stirring on the sludge at the stirring speed of 100rpm to increase the dissolution of organic matters.
Sludge treated by the method of example 7 above: soluble sugar concentration: 1562 mg/L, and 4726 mg/L soluble protein.
Example 8
1 kg of primary sludge and 10 kg of excess sludge (the mass ratio of the primary sludge to the excess sludge is 1: 10) of a sewage treatment plant were taken to constitute mixed sludge for the treatment of the present example. Adding 10% of NaOH and 10% of urea into the mixed sludge, then precooling the sludge for 1 hour at 4 ℃, and in the precooling process, carrying out anaerobic stirring on the sludge at the stirring speed of 100rpm to increase the dissolution of organic matters.
Sludge treated by the method of example 8 above: soluble sugar concentration: 835 mg/L, soluble protein 7254 mg/L.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments and the generic principles defined herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.

Claims (6)

1. A method for promoting hydrolysis of sludge to release soluble organic matters is characterized by comprising the following steps:
(1) respectively taking primary sludge and excess sludge of a sewage treatment plant to form mixed sludge, wherein the mass ratio of the primary sludge to the excess sludge in the mixed sludge is 10: 1-1: 10;
(2) adding urea and alkali into the mixed sludge obtained in the step (1), wherein the mass of the added urea is less than 15% of the mass of the mixed sludge, and the mass of the added alkali is less than 15% of the mass of the mixed sludge; the base is NaOH, KOH or Ca (OH)2Any one of the above;
(3) pre-cooling the mixed sludge treated in the step (2) for 0.5-3 hours at the temperature of 0-5 ℃; in the precooling process, anaerobic stirring is carried out on the sludge, the stirring speed is 20-150 rpm, and the dissolution of organic matters is increased.
2. The method according to claim 1, wherein in the step (1), the mass ratio of the primary sludge to the excess sludge in the mixed sludge is preferably 1: 1.
3. The method according to claim 1, wherein in the step (2), the mass of the urea added to the mixed sludge is preferably 10% of the mass of the mixed sludge.
4. The method according to claim 1, wherein in the step (2), the amount of the alkali added to the mixed sludge is preferably 10% by mass of the mixed sludge.
5. The method according to claim 1, wherein in the step (3), the pre-cooling time is preferably 1 hour.
6. The method according to claim 1, wherein in step (3), the sludge is anaerobically stirred at a stirring speed of preferably 100 rpm.
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CN107935333B (en) * 2017-12-04 2020-10-02 哈尔滨工业大学（深圳） Method for synchronously removing nitrogen and phosphorus generated in sludge fermentation process

Citations (5)

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Publication number Priority date Publication date Assignee Title
CN101085997A (en) * 2006-06-09 2007-12-12 同济大学 Method for promoting organic acid yield from sludge
CN101705256A (en) * 2009-11-09 2010-05-12 厦门大学 Method for producing volatile fatty acid by using sludge as substrate
KR20100111787A (en) * 2009-04-08 2010-10-18 주식회사 에코비젼 Method for co-treating pretreated sludge and organic wastewater
CN103708696A (en) * 2013-12-20 2014-04-09 华南理工大学 Method for fast producing methane by utilizing excess sludge
CN106145579A (en) * 2016-08-05 2016-11-23 华东理工大学 Alkaline residue and excess sludge coupled rotational flow release carbon method and device

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Publication number Priority date Publication date Assignee Title
US20040004038A1 (en) * 2002-07-03 2004-01-08 Jfe Engineering Corporation Method and apparatus for treating sludge, and method and apparatus for treating wastewater utilizing the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101085997A (en) * 2006-06-09 2007-12-12 同济大学 Method for promoting organic acid yield from sludge
KR20100111787A (en) * 2009-04-08 2010-10-18 주식회사 에코비젼 Method for co-treating pretreated sludge and organic wastewater
CN101705256A (en) * 2009-11-09 2010-05-12 厦门大学 Method for producing volatile fatty acid by using sludge as substrate
CN103708696A (en) * 2013-12-20 2014-04-09 华南理工大学 Method for fast producing methane by utilizing excess sludge
CN106145579A (en) * 2016-08-05 2016-11-23 华东理工大学 Alkaline residue and excess sludge coupled rotational flow release carbon method and device

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