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A method for strengthening anaerobic co-digestion based on the isoelectric point of sludge using acid fermentation of food waste

A technology of food waste and isoelectric point, which is applied in chemical instruments and methods, biological sludge treatment, water/sludge/sewage treatment, etc., can solve the problems that limit the development of pretreatment technology, and achieve the degradation rate of sludge organic matter Improvement, yield improvement, and the effect of strengthening anaerobic digestion efficiency

Active Publication Date: 2021-07-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the isoelectric point of sludge is acidic (pH value is 3.5-4.5), and exogenous hydrogen protons need to be added, which limits the development of this pretreatment technology

Method used

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  • A method for strengthening anaerobic co-digestion based on the isoelectric point of sludge using acid fermentation of food waste

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Effect test

Embodiment 1

[0061] The method for strengthening anaerobic co-digestion based on the isoelectric point of sludge using acid fermentation of kitchen waste in this embodiment includes the following steps:

[0062] (1) After thermal hydrolysis pretreatment of 500g of kitchen waste, high-temperature (55°C) anaerobic fermentation for acid production for 4 days was carried out to obtain food waste fermentation acid production liquid;

[0063] (2), concentrating and enriching the food waste fermentation acid production liquid in the enrichment step (1) to make the pH<3, and collecting the fermentation acid production supernatant and the fermentation residue respectively;

[0064] (3), adjust the pH value of 500g of sludge to the isoelectric point of the sludge (pH value is 4.2) with the fermented acid production supernatant of step (2), and stir with the rotating speed of 400rpm for 4h;

[0065] (4), the sludge after conditioning in step (3) is carried out solid-liquid separation with the rotatin...

Embodiment 2

[0073] The method for strengthening anaerobic co-digestion based on the isoelectric point of sludge using acid fermentation of kitchen waste in this embodiment includes the following steps:

[0074] (1) After thermal hydrolysis pretreatment of 500g of kitchen waste, high-temperature (55°C) anaerobic fermentation for acid production for 3 days to obtain food waste fermentation acid production liquid;

[0075] (2), concentrating and enriching the food waste fermentation acid production liquid in the enrichment step (1) to make the pH<3, and collecting the fermentation acid production supernatant and the fermentation residue respectively;

[0076] (3), adjust the pH value of 500g sludge to the isoelectric point of the sludge (pH value is 3.8) with the fermented acid production supernatant of step (2), and stir with the rotating speed of 600rpm for 3h;

[0077] (4), the sludge after conditioning in step (3) is carried out solid-liquid separation with the rotating speed of 10000rpm...

Embodiment 3

[0085] The method for strengthening anaerobic co-digestion based on the isoelectric point of sludge using acid fermentation of kitchen waste in this embodiment includes the following steps:

[0086] (1) After thermal hydrolysis pretreatment of 500g of kitchen waste, high-temperature (55°C) anaerobic fermentation for acid production for 6 days to obtain food waste fermentation acid production liquid;

[0087] (2), concentrating and enriching the food waste fermentation acid production liquid in the enrichment step (1) to make the pH<3, and collecting the fermentation acid production supernatant and the fermentation residue respectively;

[0088] (3), adjust the pH value of 400g sludge to the isoelectric point of the sludge (pH value is 4.1) with the fermented acid production supernatant of step (2), and stir with the rotating speed of 800rpm for 6h;

[0089] (4), the sludge after conditioning in step (3) is carried out solid-liquid separation with the rotating speed of 10000rpm...

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Abstract

The invention provides a method for strengthening anaerobic digestion of sludge by acid fermentation of kitchen waste based on isoelectric point, which comprises: performing acid production on kitchen waste by anaerobic fermentation to obtain acid production liquid by fermentation of kitchen waste; Collect the food waste fermentation acid production liquid, collect the fermentation acid production supernatant and fermentation residue respectively; use the fermentation acid production supernatant to condition the sludge to the isoelectric point of the sludge; separate the conditioned sludge from solid and liquid, separate Collect the first supernatant and sludge deposits; adjust the first supernatant with lye, perform centrifugation, and collect the second supernatant and metal deposits respectively; treat the second supernatant with a cation exchange resin, Collect the filtrate; mix and stir the fermentation residue, sludge deposits and filtrate to obtain a mixture; carry out anaerobic digestion, and collect biogas and biogas residue; the present invention utilizes the food waste fermentation acid production liquid to provide exogenous hydrogen protons to remove pollution The heavy metals in the sludge can effectively dispose of kitchen waste while strengthening the resource utilization of sludge.

Description

technical field [0001] The invention belongs to the technical field of resource treatment of perishable organic waste such as sludge, and in particular relates to a method for strengthening anaerobic co-digestion by using acid fermentation of kitchen waste based on the isoelectric point of sludge. Background technique [0002] At present, with the popularization and application of activated sludge method in sewage treatment plants, a large amount of waste activated sludge is produced. Waste activated sludge contains a large amount of perishable organic matter and heavy metals, which may cause serious secondary pollution if not treated in time. 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. However, the long sludge anaerobic digestion cycle (more than 30 days), low methane production per unit of organic matter (VS) (180-220mL / gVS) and low degree ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C02F9/04
CPCC02F1/42C02F1/66C02F11/04C02F2001/425Y02E50/30
Inventor 许颖戴晓虎郑琳珂耿慧
Owner TONGJI UNIV
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