CN101786782A

CN101786782A - Cattle manure anaerobic fermentation process

Info

Publication number: CN101786782A
Application number: CN201010130631A
Authority: CN
Inventors: 关正军; 李文哲; 张鸿琼; 毕兰平
Original assignee: Northeast Agricultural University
Current assignee: Northeast Agricultural University
Priority date: 2010-03-24
Filing date: 2010-03-24
Publication date: 2010-07-28
Anticipated expiration: 2030-03-24
Also published as: CN101786782B

Abstract

The invention relates to a cattle manure anaerobic fermentation process which belongs to the technical field of anaerobic fermentation; the process comprises the following steps that: (1) a fluid spiral squeezing solid-liquid separator separates the fiber in cattle manure from raw materials which can be quickly fermented, and the separation process parameters are as follows: the mass ratio of cattle manure to water is 2:1, the spiral rotating speed is 68r/min, the separation gap is 1.5mm, and solid and liquid are prepared after solid-liquid separation; and (2) two-phase anaerobic digestion is carried out to the liquid prepared in step (1), the fermentation temperature is 35DEG C, the inoculum is 30 percent when the methanogenic phase is started, the liquid is acidified for 3 days and enters a methane reactor, the daily feeding and discharge are one seventh of the effective volume of the methane reactor, the liquid discharged by the methane reactor is fermented for 1 day, the total hydraulic retention time is 11 days, and marsh gas is prepared; and the process makes full use of the crude fiber in the cattle manure, reduces the C/N of the fermentation raw materials, and has the advantages of short hydraulic retention time, high equipment utilization rate, water saving, and high methane yield in the marsh gas.

Description

A kind of cow dung anaerobic ferment process

Technical field

The invention belongs to anaerobic fermentation technology, relate generally to just anaerobically fermenting treatment process method of cow dung.

Background technology

At present, utilize anaerobically fermenting to handle the livestock and poultry farm ight soil methods that adopt simple pre-treatment and full mixed fermentation more.Compare with chicken manure with pig manure, crude fiber content is many in the cow dung, and carbon-nitrogen ratio is big, and in the anaeration in normal temperature fermenting process, robust fibre is difficult to be utilized by anaerobion, influences the gas producing efficiency of cattle manure; Simultaneously, simple full mixed fermentation, hydraulic detention time is long, and plant factor is low, has influenced the economical effectiveness of utilizing the cow dung anaerobically fermenting to produce methane.

Summary of the invention

Purpose of the present invention is exactly the problem that exists at above-mentioned prior art, and design provides a kind of cow dung anaerobic ferment process, reaches to make that robust fibre is fully utilized fully in the cow dung, the hydraulic detention time that ferments short, produce the high purpose of methane efficient.

The object of the present invention is achieved like this: a kind of cow dung anaerobic ferment process, 1., utilize stream shape thing screw press equipment for separating liquid from solid that fiber in the cow dung and raw material that can quick fermentation are separated, separation process parameters is: the mass ratio of cow dung and water is 2: 1,68 rev/mins of revolutions speed of screw, 1.5 millimeters of Separations; Obtain solid substance and liquid after the solid-liquid separation respectively: wherein become density behind solid substance drying, the briquetting and reach 1.2 gram per centimeters ³Fuel brick, for the biogas engineering heat tracing provides fuel; 2., utilize that the above-mentioned TS value that obtains after separating in 1. is 6%, C/N carries out diphasic anaerobic less than 20 liquid and ferments, 35 ℃ of leavening temperatures, when product methane starts mutually, inoculum size is 30%, the feed liquid acidifying entered after 3 days produces the methane reaction device, every day, inlet amount was for producing 1/7 of methane reaction device useful volume, to from producing the feed liquid secondary fermentation 1 day that the methane reaction device discharges, make and to produce the methane composition in the feed liquid and fully ferment, total hrt 11 days, get methane biogas, finish the cow dung anaerobic fermentation process.

This technology can make full use of the organic waste in the cow dung, when biogas engineering heat tracing fuel is provided, reduced the C/N of fermentation raw material again, adopt the diphasic anaerobic zymotechnique, shorten hydraulic detention time, improved plant factor, water saving, improve methane production in the biogas, had the application prospect of highly significant.

Description of drawings

Accompanying drawing is a kind of cow dung anaerobic ferment process schematic flow sheet.

Embodiment

Give an actual example below and describe the present invention.A kind of cow dung anaerobic ferment process, 1., utilize stream shape thing screw press equipment for separating liquid from solid that fiber in the cow dung and raw material that can quick fermentation are separated, separation process parameters is: the mass ratio of cow dung and water is 2: 1,68 rev/mins of revolutions speed of screw, 1.5 millimeters of Separations; Obtain solid substance and liquid after the solid-liquid separation respectively: wherein become density behind solid substance drying, the briquetting and reach 1.2 gram per centimeters ³Fuel brick, for the biogas engineering heat tracing provides fuel; 2., utilize that the above-mentioned TS value that obtains after separating in 1. is 6%, C/N carries out diphasic anaerobic less than 20 liquid and ferments, 35 ℃ of leavening temperatures, when product methane starts mutually, inoculum size is 30%, the feed liquid acidifying entered after 3 days produces the methane reaction device, every day, inlet amount was for producing 1/7 of methane reaction device useful volume, to from producing the feed liquid secondary fermentation 1 day that the methane reaction device discharges, make and to produce the methane composition in the feed liquid and fully ferment, total hrt 11 days, get methane biogas, finish the cow dung anaerobic fermentation process.

In this technology, the solid substance that obtains after the solid-liquid separation partly total solids level TS is not less than 40%, and behind the cow dung anaerobically fermenting, the biogas volume yield rate reaches 1.3m ³/ (m ³D), the methane yield reaches 70% in the biogas.

Claims

1. cow dung anaerobic ferment process, 1., utilize stream shape thing screw press equipment for separating liquid from solid that fiber in the cow dung and raw material that can quick fermentation are separated it is characterized in that:, separation process parameters is: the mass ratio of cow dung and water is 2: 1,68 rev/mins of revolutions speed of screw, 1.5 millimeters of Separations; Obtain solid substance and liquid after the solid-liquid separation respectively: wherein become density behind solid substance drying, the briquetting and reach 1.2 gram per centimeters ³Fuel brick, for the biogas engineering heat tracing provides fuel; 2., utilize that the above-mentioned TS value that obtains after separating in 1. is 6%, C/N carries out diphasic anaerobic less than 20 liquid and ferments, 35 ℃ of leavening temperatures, when product methane starts mutually, inoculum size is 30%, the feed liquid acidifying entered after 3 days produces the methane reaction device, every day, inlet amount was for producing 1/7 of methane reaction device useful volume, to from producing the feed liquid secondary fermentation 1 day that the methane reaction device discharges, make and to produce the methane composition in the feed liquid and fully ferment, total hrt 11 days, get methane biogas, finish the cow dung anaerobic fermentation process.