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Sludge and food waste mixed treatment process

A mixed treatment and waste technology, which is applied in biological sludge treatment, water/sludge/sewage treatment, solid waste removal, etc., can solve the problem of low resource utilization, save energy, reduce costs, and shorten treatment The effect of process time

Inactive Publication Date: 2020-08-14
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, a large amount of domestic waste and kitchen waste are also produced in rural areas of our country every day, most of which can be biodegraded or biocomposted, but the resource utilization rate is low. Under this situation, the inventor found that mixing sludge with food waste After treatment, the amount of bioenergy produced is more than three times that of single treatment. This type of bioenergy can be used to generate electricity, save energy, and improve resource utilization.

Method used

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  • Sludge and food waste mixed treatment process
  • Sludge and food waste mixed treatment process
  • Sludge and food waste mixed treatment process

Examples

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Effect test

Embodiment 1

[0025] A process for mixed treatment of sludge and food waste, comprising the following steps:

[0026] Step 1. Anaerobic activated sludge cultivation: Put the fresh sludge produced every day into the anaerobic digester, and then pass in steam. The temperature rise rate is controlled at 1°C / h, and the temperature is raised to 70°C. Stop adding sludge when the amount of sludge added reaches the design liquid level of the digester, and the incubation time is 30 days;

[0027] Step 2. Primary acidification of food waste: place the food waste in the primary hydrolytic acidification tank, and perform a short-term hydrolytic acidification reaction for 3 days at 36°C;

[0028] Step 3. High-efficiency extrusion of food waste: transfer the primary hydrolyzed food waste in step 2 to the screw extrusion system for dehydration to achieve solid-liquid separation and achieve the purpose of volume reduction and compression;

[0029] Step 4, anaerobic microbial digestion: mix the liquid obta...

Embodiment 2

[0032] A process for mixed treatment of sludge and food waste, comprising the following steps:

[0033] Step 1. Anaerobic activated sludge cultivation: Put the fresh sludge produced every day into the anaerobic digestion tank, and then pass in steam. The heating rate is controlled at 2°C / h, and the temperature is raised to 45°C. Stop adding sludge when the amount of sludge dosage reaches the design liquid level of the digester, and the incubation time is 40 days;

[0034] Step 2. Primary acidification of food waste: place the food waste in the primary hydrolytic acidification tank, and perform a short-term hydrolytic acidification reaction at 42°C for 5 days;

[0035] Step 3. High-efficiency extrusion of food waste: transfer the primary hydrolyzed food waste in step 2 to the screw extrusion system for dehydration to achieve solid-liquid separation and achieve the purpose of volume reduction and compression;

[0036] Step 4, anaerobic microbial digestion: mix the liquid obtain...

Embodiment 3

[0038] Embodiment 3: a kind of technology of sludge and food waste mixed treatment, comprises the following steps:

[0039] Step 1. Anaerobic activated sludge cultivation: Put the fresh sludge produced every day into the anaerobic digester, and then pass in steam. The temperature rise rate is controlled at 1.5°C / h, and the temperature is raised to 50°C. Stop adding sludge when the amount of sludge dosage reaches the design liquid level of the digester, and the incubation time is 35 days;

[0040] Step 2. Primary acidification of food waste: place the food waste in the primary hydrolytic acidification tank, and perform a short-term hydrolytic acidification reaction at 40°C for 4 days;

[0041] Step 3. High-efficiency extrusion of food waste: transfer the primary hydrolyzed food waste in step 2 to the screw extrusion system for dehydration to achieve solid-liquid separation and achieve the purpose of volume reduction and compression;

[0042] Step 4, anaerobic microbial digestion...

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Abstract

The invention discloses a sludge and food waste mixed treatment process. The invention belongs to the field of garbage treatment processes. The process comprises five steps of anaerobic activated sludge culture, primary acidification of the food waste, efficient extrusion of the food waste, anaerobic microorganism digestion and reutilization. According to the process, the sludge is subjected to stabilizing treatment, environmental pollution is avoided, biological energy obtained through sludge and food mixing treatment is more than that obtained through single treatment by three times, the resource utilization rate is increased, the biological energy can be used for power generation, energy is saved for large facilities, and the recycling value of food waste is better played.

Description

technical field [0001] The invention belongs to the field of garbage treatment technology, and in particular relates to a technology for mixed treatment of sludge and food waste. Background technique [0002] With the rapid development of the economy in rural areas of our country and the rapid improvement of people's living standards, the way of life of farmers has undergone great changes. The non-point source pollution caused by the random discharge of rural pollutants and organic solid waste has caused a huge threat to the rural environment, especially sludge and food waste. There is a big difference between rural sludge and urban sludge. The biggest limitation of urban sludge land use is heavy metals, which are relatively low in rural areas, while rural sludge moisture content, organic matter content, persistent organic matter and pathogenic bacteria content higher. Compared with cities, we believe that the most important thing for sludge in rural areas is to achieve st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F3/28C10L3/08B09B3/00B09B5/00C05F15/00
CPCC02F11/04C02F3/2893C10L3/08B09B3/00B09B5/00C05F7/00C05F9/00C05F11/08Y02E50/30
Inventor 赵文玉刘志华刘梦月卿志和蒋朝晖刘春华晏永祥
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY