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A sludge fermentation acid-producing method combining thermo-alkaline pretreatment and semi-continuous flow fermentation

A hot alkali pretreatment, semi-continuous technology, applied in the direction of biological sludge treatment, etc., to achieve the effect of shortening the reaction time, increasing the acid production, and rapid acid production process

Inactive Publication Date: 2016-03-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Anaerobic fermentation of municipal sludge to produce organic acids is a new way to realize sludge resource utilization, but since most of the organic matter in sludge is microbial cells, which are wrapped by cell walls, the cell walls are tough and not easy to damage, so the organic matter in sludge cells The dissolution and transformation of the sludge are the key steps to limit the acid production of sludge anaerobic fermentation

Method used

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  • A sludge fermentation acid-producing method combining thermo-alkaline pretreatment and semi-continuous flow fermentation
  • A sludge fermentation acid-producing method combining thermo-alkaline pretreatment and semi-continuous flow fermentation
  • A sludge fermentation acid-producing method combining thermo-alkaline pretreatment and semi-continuous flow fermentation

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Embodiment 1

[0031] Sludge was collected from Taihu New Town Wastewater Treatment Plant in Wuxi City, and the total solids (TS, totalsolids) and volatile solids (VS, volatilesolid) of the sludge were 15.46g / g and 0.61g / g-TS, respectively. Adjust the sludge with water to a thick slurry of 75gTS / L, and then pump it into the pretreatment tank for hot alkali pretreatment. The pretreatment conditions are: temperature T=70-100° C., pH=10-12, and reaction time 2-3 hours. After hot alkali pretreatment, anaerobic fermentation was carried out in a 30L fermenter. The main technical parameters and operating parameters of the fermenter (1# is a pretreatment tank, and 2# is a fermentation reaction tank) are shown in Table 1 and Table 2. The liquid volume of the fermentation tank is 21L, the inoculation amount of the seed sludge is 10%, then add 90% of the volume of the pretreated sludge, and fill the 2# tank with nitrogen for more than 15 minutes to maintain the anaerobic condition (no need to fill the...

Embodiment 2

[0037] Collect concentrated sludge from Wuxi Lucun Wastewater Treatment Plant, the sludge TS and VS are 13.30g / L and 0.65g / g-TS respectively. The recovered sludge is directly subjected to thermal alkali pretreatment-semi-continuous flow fermentation reaction, and the main technical parameters and operating parameters of the fermenter (1# is the pretreatment tank, 2# is the fermentation reaction tank) are shown in Table 1 and Table 2 . The liquid volume of the fermentation tank is 21L, the inoculation amount of the seed sludge is 10%, then add 90% of the volume of the pretreated sludge, and fill the 2# tank with nitrogen for more than 15 minutes to maintain the anaerobic condition (no need to fill the nitrogen later, the whole system Good sealing), start the fermentation reaction. The hydraulic retention time is 10 days, and the feed and discharge are carried out every 2 days (that is, 4.2L of fermented sludge is discharged, and 4.2L of pretreated sludge is injected at the sam...

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Abstract

A sludge fermentation acid-producing method is disclosed. The method includes a step of preparing sludge to be treated into thick slurry having a concentration of 10-100 g-TS / L with water, a step of performing thermo-alkaline pretreatment and a step of subjecting the sludge subjected to the thermo-alkaline pretreatment to semi-continuous flow anaerobic fermentation, wherein the thermo-alkaline pretreatment includes adjusting the pH of the thick sludge slurry to be alkaline and heating the sludge the pH of which is adjusted.

Description

technical field [0001] The invention relates to the field of sludge solid waste treatment, in particular to a method for producing acid by sludge fermentation combined with hot alkali pretreatment and semi-continuous flow anaerobic fermentation. Background technique [0002] Sludge is a by-product of the biological treatment process of urban domestic sewage. Our country produces about 9 million tons of dry sludge every year, accounting for about 0.3% of the total waste. According to the data released by the Ministry of Housing and Urban-Rural Development in February 2013, by the end of 2012, a total of 3,340 urban sewage treatment plants had been built in cities and counties across the country, with a sewage treatment capacity of about 142 million m 3 / day, assuming that the sewage treatment load rate is 75%, and every 10,000 tons of sewage produces 6 tons of sludge with a water content of 80%, then my country will produce 63,900 tons of sludge with a water content of 80% e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04
Inventor 刘和徐晓宇陈兴春刘宏波符波
Owner JIANGNAN UNIV
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