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Process for preparing biogas from high-solid-content municipal sludge

A biogas and municipal sludge technology, which is applied in biological sludge treatment, oxidation treatment of sludge, water/sludge/sewage treatment, etc., can solve the problems of unsuitability for large-scale production, long reaction time, and high material consumption. , to achieve the effect of good sterilization treatment, less reagent residue and high energy consumption

Pending Publication Date: 2021-12-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent uses mesophilic anaerobic digestion, which has a lower reaction rate than high-temperature anaerobic digestion, resulting in a long reaction time; and the speed used is relatively fast, which is not suitable for large-scale production
Add ferric chloride and ferrous chloride solution after thermal hydrolysis, the concentration used is relatively large, and the material consumption is relatively large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The high-solid municipal sludge is a new process for efficiently preparing biogas. The treated sludge is the excess sludge from the municipal sewage treatment plant. The sludge after sludge concentration is mixed with dewatered sludge, and the mass ratio is 2.4:1. After stirring evenly, the solid content of the mixed sludge was 8%.

[0040] The mixed sludge is treated with a fungicide before thermal hydrolysis, and the fungicide used is sodium dichloroisocyanurate. Sodium dichloroisocyanurate is a white powder with strong oxidizing properties. The dose used was 30 mg / g MLSS and the treatment time was 2 hours. The sterilized sludge enters the baffle plate reactor (baffle plate push-flow high temperature thermal hydrolysis reactor) for high temperature thermal hydrolysis, and is heated by steam. Under normal pressure, the reaction temperature is about 85°C, and the reaction time is 3 hours. . The high-temperature thermal hydrolysis reactor uses more steam at the front ...

Embodiment 2

[0044] The high-solid municipal sludge is a new process for efficiently preparing biogas. The treated sludge is the excess sludge from the municipal sewage treatment plant. The sludge after sludge concentration is mixed with dewatered sludge, and the mass ratio is 1.5:1. After stirring evenly, the solid content of the mixed sludge was 10%.

[0045] The mixed sludge is treated with a fungicide before thermal hydrolysis, and the fungicide used is sodium dichloroisocyanurate. Sodium dichloroisocyanurate is a white powder with strong oxidizing properties. The dose used was 40 mg / g MLSS and the treatment time was 3 hours. The sterilized sludge enters the baffle plate reactor (baffle plate push-flow high temperature thermal hydrolysis reactor) for high temperature thermal hydrolysis, and is heated by steam. Under normal pressure, the reaction temperature is about 90°C, and the reaction time is 4 hours. . The high-temperature thermal hydrolysis reactor uses more steam at the front...

Embodiment 3

[0048] The high-solid municipal sludge is a new process for efficiently preparing biogas. The treated sludge is the excess sludge from the municipal sewage treatment plant. The sludge after sludge concentration is mixed with dewatered sludge, and the mass ratio is 1:1. After stirring evenly, the solid content of the mixed sludge was 12%.

[0049] The mixed sludge is treated with a fungicide before thermal hydrolysis, and the fungicide used is sodium dichloroisocyanurate. Sodium dichloroisocyanurate is a white powder with strong oxidizing properties. The dose used was 50 mg / g MLSS and the treatment time was 4 hours. The sterilized sludge enters the baffle plate reactor (baffle plate push-flow high temperature thermal hydrolysis reactor) for high temperature thermal hydrolysis, and is heated by steam. Under normal pressure, the reaction temperature is about 95°C, and the reaction time is 5 hours. . The high-temperature thermal hydrolysis reactor uses more steam at the front e...

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Abstract

The invention relates to a sludge treatment process, in particular to a process for preparing biogas from high-solid-content municipal sludge, which comprises the following steps: adding a bactericide into mixed sludge for sterilizing treatment, and carrying out thermal hydrolysis and anaerobic digestion to obtain the biogas. Compared with the prior art, the method has the advantages that the sludge anaerobic digestion effect is good, the reaction time is obviously shortened, the gas production rate is higher, the defects of a conventional method are overcome, and a feasible way is provided for efficient preparation of biogas from high-solid-content municipal sludge and waste gas treatment. The fuel gas is simple in preparation process, simple in using method and suitable for sludge reduction treatment of large-scale municipal sewage plants.

Description

technical field [0001] The invention relates to a sludge treatment process, in particular to a process for preparing biogas from municipal sludge with high solid content. Background technique [0002] With the economic development and the continuous expansion of urban population, the discharge of industrial wastewater and domestic sewage is increasing. The sewage treatment rate of municipal sewage treatment plants has gradually increased, and the amount of sludge produced has also increased. According to statistics from the Ministry of Housing and Urban-Rural Development, in 2018, the amount of dry sludge produced by my country's urban sewage treatment plants was 11.76 million tons, and the amount of dry sludge disposed of was 11.29 million tons. In recent years, the urban dry sludge disposal rate has been above 90%. In 2019, the amount of dry sludge produced by urban sewage treatment plants was about 12.32 million tons, and the amount of dry sludge disposed of was about 11...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/06C02F11/18
CPCC02F11/04C02F11/06C02F11/18C02F2303/04C02F2303/10
Inventor 王进车生泉谢长坤
Owner SHANGHAI JIAO TONG UNIV