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A method based on the isoelectric point to promote the prealcoholization of excess sludge and strengthen anaerobic digestion

A technology for excess sludge and anaerobic digestion, applied in chemical instruments and methods, sludge treatment, biological sludge treatment, etc., can solve problems such as different treatment effects and difficult degradation, and achieve the effect of increasing production and improving digestion efficiency

Active Publication Date: 2021-02-12
TONGJI UNIV
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  • Application Information

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Problems solved by technology

These treatment methods increase the dissolution of sludge organic matter to a certain extent, but often have different treatment effects for different sludges and even produce more non-degradable organic matter

Method used

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  • A method based on the isoelectric point to promote the prealcoholization of excess sludge and strengthen anaerobic digestion
  • A method based on the isoelectric point to promote the prealcoholization of excess sludge and strengthen anaerobic digestion

Examples

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Embodiment 1

[0028] Embodiment one: a kind of method based on isoelectric point promotes excess sludge prealcoholization and strengthens anaerobic digestion, (such as figure 1 shown) specifically includes the following steps:

[0029] Step a: measure the isoelectric point (pI value) of remaining sludge by Zeta potential method;

[0030] Step b: According to the pI value measured in step a, use the acid solution to adjust the pH value of the remaining sludge system to the pI value, and stir at a speed of 600-1000 r / min at 20°C for 3-5 hours, wherein the acid solution can be hydrochloric acid , sulfuric acid, phosphoric acid, the concentration is 6.0mol / L;

[0031] Step c: Centrifuge the pretreated sludge in step b at a speed of 8000-12000 r / min, and collect the supernatant and solid sludge respectively;

[0032] Step d: Use lye to adjust the supernatant produced in step c to a certain pH value, and at the same time stir at a speed of 200-400r / min, wherein the lye can be 6.0mol / L sodium hy...

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Abstract

The invention discloses a treatment method suitable for anaerobic digestion of excess sludge. According to the technical scheme, the treatment method suitable for anaerobic digestion of the excess sludge is characterized by comprising the following steps of (1) measuring a pI value of the excess sludge through a Zeta potential method; (2) adjusting a pH value of an excess sludge system by means of acid liquid; (3) conducting centrifugal treatment on the sludge, and collecting supernate and solid sludge separately; (4) adjusting a pH value of the supernate by means of alkali liquid, conducting fractional precipitation to recover metal, conducting centrifugal treatment, and collecting a metal precipitate and an upper-portion solution separately; (5) dissolving the solid sludge again in the upper-portion solution and softened water until TS is 2-10%; (6) transferring the sludge into an alcoholization phase reactor, and carrying out sludge alcoholization reaction; and (7) transferring all sludge subjected to the reaction into an methane-production phase reactor for anaerobic methane production. According to the treatment method suitable for anaerobic digestion of the excess sludge, through an isoelectric point pre-treatment method, transformation of sludge organic matters into ethyl alcohol is promoted, and the specific yield of organic matter methane is improved.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a method for promoting prealcoholization of surplus sludge and strengthening anaerobic digestion based on isoelectric point. Background technique [0002] At present, with the popularization and application of activated sludge method in urban sewage treatment plants, a large amount of excess sludge is produced. According to incomplete statistics, the annual output of sludge has exceeded 40 million tons (calculated at a water content of 80%), and is increasing at a rate of 10% per year. Anaerobic digestion technology can recover energy while reducing sludge pollution to the environment, and is considered to be a sludge treatment technology with great potential. As we all know, the period required for sludge anaerobic digestion is long (more than 30 days), the methane yield per unit organic matter (VS) is low (180-220mL / g VS is lower than the theoretical methane yield of 450-600mL / ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C02F11/00C02F11/02C02F101/30C02F101/20
CPCC02F11/00C02F11/02C02F11/04C02F2101/20C02F2101/30C02F2209/06Y02E50/30
Inventor 戴晓虎许颖郑琳珂卢怡清
Owner TONGJI UNIV
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