A method for recycling citrus peel residue and dewatered sludge to produce biogas by fermentation

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, orange...

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