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Method of producing biogas by recycling orange peel residue and dehydrated sludge through fermentation

A technology of citrus peel residue and dewatered sludge, applied in fermentation, biological sludge treatment, gas fuel and other directions, can solve the problems of low microbial concentration, long fermentation process, low nitrogen and phosphorus content, etc., to increase microbial biomass and improve fertilizer efficiency. , the effect of low operating costs

Inactive Publication Date: 2015-12-09
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some problems also appeared in the process of anaerobic fermentation of citrus peels, such as the low concentration of microorganisms, resulting in a long fermentation process and low gas production. (biogas slurry and biogas residue) poor performance as fertilizer
[0004] In addition, municipal sludge contains a large amount of nitrogen, phosphorus and rich microbial populations, how to deal with it has also become a difficult problem in the field of sewage treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix 1.000kg of fresh citrus peel (moisture content 81.5%) crushed to less than 5mm with 0.902kg dewatered sludge (water content 79.5%, volatile solid mass fraction 70.5%), and then add 0.925kg inoculum (water content 92% yield) and 4.19L water were fully mixed, and anaerobic fermentation was performed for 20 days at an average temperature of 30°C. During the fermentation process, quicklime supernatant was used to adjust and maintain the pH of the fermentation broth at 6.5. Among them: moisture content refers to the mass fraction of water. Volatile solids mass fraction refers to the mass fraction of volatile solids in dry matter. The results are shown in Table 1.

[0025] Table 1

[0026] project Total gas production (ml) Average daily gas production (ml) COD removal rate (%) Methane content (%) materials 15932.6 796.6 48.2 59.1

Embodiment 2

[0028] Mix 0.960kg of fresh citrus peel (moisture content 81.5%) crushed to less than 5mm with 0.298kg dewatered sludge (water content 70.0%, volatile solid mass fraction 80.0%), and then add 0.545kg inoculum (water content 90% yield) and 4.19L water were fully mixed, and anaerobic fermentation was performed for 26 days at an average temperature of 25°C. During the fermentation process, the quicklime supernatant was used to adjust and maintain the pH of the fermentation broth between 7.0. The results are shown in Table 2.

[0029] Table 2

[0030] project Total gas production (ml) Average daily gas production (ml) COD removal rate (%) Methane content (%) materials 15548.5 598.0 44.1 56.8

Embodiment 3

[0032] 1.960kg of fresh citrus peels (water content 81.5%) crushed to less than 5mm were fully mixed with 0.690kg dewatered sludge (water content 65.0%, volatile solid mass fraction 50.5%), and then 1.975kg inoculum (water content rate of 94%) and 4.19L of water were fully mixed, and anaerobic fermentation was performed for 24 days at an average temperature of 20°C. During the fermentation process, quicklime supernatant was used to adjust and maintain the pH of the fermentation broth at 7.5. The results are shown in Table 3.

[0033] table 3

[0034] project Total gas production (ml) Average daily gas production (ml) COD removal rate (%) Methane content (%) materials 18946.5 789.4 50.2 58.5

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Abstract

The invention aims to the problem of difficult treatment on orange peel residues and municipal sludge and low recycling utilization rate and discloses a method of producing biogas by recycling orange peel and dehydrated sludge through fermentation. In the method, the orange peel residue and the dehydrated sludge are employed as raw materials to perform anaerobic fermentation, wherein the fermentation pH is regulated through a quick lime supernatant. The method allows continuous fermentation and batch fermentation. In the method, the characters that the orange peel residue is high in organic substance content and the dehydrated sludge is high in nitrogen and phosphorus contents and is abundant in microorganism colonies are fully utilized, thereby not only effectively solves the problems of recycling the orange peel residue and the municipal sludge, but also increasing common fermentation efficiency of the orange peel residue and increasing the utilizability of biogas residue and biogas liquid as fertilizers after common fermentation of the orange peel residue. The method is excellent in economic and environmental benefit.

Description

technical field [0001] The invention belongs to the field of solid waste treatment and disposal, and relates to a method for recycling citrus peel residue and dewatered sludge to produce biogas by fermentation. Background technique [0002] In recent years, with the rapid development of my country's citrus industry, the problem of citrus peel residue treatment and disposal has become increasingly prominent. Traditional treatment methods such as landfill will not only cause secondary pollution, but also waste resources. Citrus peels are rich in nutrients such as carbohydrates, fats, vitamins, amino acids and minerals, but undried citrus peels have a high water content and are easy to rot and deteriorate, so they are not suitable for long-distance transportation and long-term storage. Brazil, the United States and other citrus processing countries have relatively mature technologies for the treatment of citrus pomace, such as extracting essential oils, pigments, pectin, oran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C10L3/10C12P5/02
CPCY02E50/30
Inventor 申渝晏鹏郭劲松陈猷鹏周月明
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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