CN101492696A

CN101492696A - High-efficiency method for producing hydrogen gas and methyl hydride with mix fermentation of sewage sludge and garbage

Info

Publication number: CN101492696A
Application number: CNA2008100305574A
Authority: CN
Inventors: 聂艳秋; 李玉秀
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-01-26
Filing date: 2008-01-26
Publication date: 2009-07-29
Anticipated expiration: 2028-01-26
Also published as: CN101492696B

Abstract

The invention relates to a method for effectively manufacturing hydrogen and methane by means of mixed fermentation of municipal sludge and trash. The method is characterized in that activated sludge for anaerobic digestion in sewage plants and heated and labilized anaerobic activated sludge are respectively used as methane-producing seed sludge and hydrogen-producing seed sludge; the municipal sludge and trash are mixed based on a certain proportion, then lime is added, the municipal sludge, the trash and the lime are placed in an alkaline hydrolysis reactor for carrying out alkaline hydrolysis; the mixture and the hydrogen-producing seed sludge after the alkaline hydrolysis are pumped into a hydrogen-producing reactor for carrying out hydrogen-producing reaction; generated biogas containing hydrogen is collected; the left mixture after hydrogen production and the methane-producing seed sludge are pumped into a methane-producing reactor for producing methane by means of hybrid reaction, so that clean energy such as hydrogen and methane featuring high heating value can be obtained and waste can be turned into resources, moreover, the problem of pollution of the municipal sludge and trash to the environment is solved, in addition, the reactors of the invention can either be operated in a sequencing batch way or in a continuous way, the needed equipment is simple, the operation is convenient and the cost is low.

Description

The method of a kind of municipal sludge and rubbish mixed fermentation High-efficient Production hydrogen and methane

Technical field

The present invention relates to a kind of changing waste into resources technology, the method for particularly a kind of municipal sludge and rubbish mixed fermentation High-efficient Production hydrogen and methane.

Background technology

At present, normally adopt methods such as landfill, agricultural or burning to handle, dispose to municipal sludge and rubbish.But because water accounts 40%～60% in the most of domestic waste of China, organic composition only accounts for 30%～55% in its dried solid; The moisture percentage in sewage sludge that the municipal sewage plant produces reaches 85%～99.5%, organic content 40%-60% in its dried solid, and rubbish and sludge calorific value generally are lower than 4000kJ/kg, and are unwell to burning disposal.When heavy metal content is higher in rubbish and the mud, also be not suitable for agricultural.Therefore most rubbish all adopt landfill disposal, but the secondary pollution problem of underground water and atmospheric environment be can not be ignored; And mud will carry out landfill disposal, also needs further dehydration, especially trouble, cost height.

Summary of the invention

The objective of the invention is in order to solve above-mentioned technical problem, for the processing of municipal sludge and rubbish provides a kind of more valuable method of resource, i.e. the method for municipal sludge and rubbish mixed fermentation High-efficient Production hydrogen and methane.

For achieving the above object, the concrete production method of the present invention's employing is as follows:

1, planting mud prepares: produce methane kind mud and adopt Sewage Plant anaerobic digestion active sludge.Producing hydrogen kind mud is to utilize Sewage Plant anaerobic digestion active sludge to obtain through heat treated and activation, promptly get the anaerobic digestion active sludge air-dry, grind, sieve, at 105 ℃ of heating 2h down, kill non-sporeformer methanogen.To add in the 3g/L glucose nutrient solution through anaerobic activated sludge that heat treated is crossed, transfer pH to 6.5,35 ℃ of activation 24h and make and produce hydrogen kind mud down.

2, alkaline hydrolysis: the rubbish that will remove behind the non-degradable organism is wherein pulverized, is sieved, get lime, pulverize, sieve, adopt primary sludge, excess sludge, thickened sludge or the dewatered sludge of Sewage Plant, with pack into alkaline hydrolysis reactor and mix of above-mentioned mud, rubbish and lime, make the carbon-nitrogen ratio C/N of mixture remain on 10-30, lime and organism ratio C aO/VS remain on 0.05-0.2, water ratio remains on 85%-99%, and the alkaline hydrolysis reaction times is 0.5-3d.

3, produce hydrogen: the mixture behind the alkaline hydrolysis is pumped into the product hydrogen reactor, is the ratio adding product hydrogen kind mud of 0.1-0.5 in kind of mud and substrate volume ratio, mixes, and starts and produces hydrogen reactor, 30 ℃-60 ℃ of temperature, reaction times 3-8d.

4, produce methane: the remaining mixture that will produce behind the hydrogen pumps into methane-producing reactor, is that the ratio of 0.1-0.5 adds product methane kind mud in kind of mud and substrate volume ratio, mixes startup methane-producing reactor, 30 ℃-60 ℃ of temperature, reaction times 7-15d.

After the normal operation, produce hydrogen reactor and methane-producing reactor in displacer during mixture, all can reserve a certain proportion of mixture respectively as the product hydrogen kind mud of next batch reaction with produce methane kind mud.

The present invention is owing to adopt above processing method, utilize municipal sludge and rubbish to make raw material, adopt the lime alkaline hydrolysis to strengthen and produce hydrogen and produce the methane process, obtain high heating value, clear energy sources hydrogen and methane, realize changing waste into resources, solve the pollution problem of municipal sludge and rubbish environment.Nitrogenous abundant municipal sludge is carried out mixed fermentation with the municipal garbage that contains carbon rich, help the physiological metabolism of anaerobion, simultaneously by adding lime, can strengthen the alkaline hydrolysis of municipal sludge and rubbish, help improving the degradation rate of organic composition in municipal sludge and the rubbish, strengthen and produce hydrogen and produce the methane effect, hydrogen yield reaches as high as 52mL/gVS, methane production reaches as high as 103mL/gVS, improves 2-4 respectively when not adding lime doubly and 2-3 times.Only need add a small-sized alkaline hydrolysis reactor at the two-phase anaerobic digestion system front end, only need to wherein adding lime cheap and easy to get, and needn't add chemical agents such as soda acid in addition to producing hydrogen reactor and methane-producing reactor, can realize municipal sludge and rubbish mixed fermentation High-efficient Production hydrogen and methane, but the operation of each reactor sequence batch (, also continuously-running, required equipment is simple, easy to operate, with low cost.

Description of drawings

Fig. 1 is an experimental installation of the present invention.

Wherein: 1. alkaline hydrolysis reactor, 2. produce hydrogen reactor, 3. methane-producing reactor, 4-8. slush pump.

Embodiment

Embodiment 1: in the alkaline hydrolysis reactor, and C/N=30, CaO/VS=0.1, water ratio=95%, time 1d.Produce in the hydrogen reactor, planting mud and substrate volume ratio is 0.1,55 ℃ of temperature, time 8d.In the methane-producing reactor, planting mud and substrate volume ratio is 0.2,35 ℃ of temperature, time 9d.The hydrogen yield that obtains is 23mL/gVS, and methane production is 67mL/gVS.

Embodiment 2: in the alkaline hydrolysis reactor, and C/N=10, CaO/VS=0.05, water ratio=85%, time 3d.Produce in the hydrogen reactor, planting mud and substrate volume ratio is 0.3,40 ℃ of temperature, time 5d.In the methane-producing reactor, planting mud and substrate volume ratio is 0.4,40 ℃ of temperature, time 14d.The hydrogen yield that obtains is 40mL/gVS, and methane production is 84mL/gVS.

Embodiment 3: in the alkaline hydrolysis reactor, and C/N=20, CaO/VS=0.2, water ratio=90%, time 2d.Produce in the hydrogen reactor, planting mud and substrate volume ratio is 0.3,35 ℃ of temperature, time 8d.In the methane-producing reactor, planting mud and substrate volume ratio is 0.3,35 ℃ of temperature, time 15d.The hydrogen yield that obtains is 52mL/gVS, and methane production is 103mL/gVS.

Embodiment 4: in the alkaline hydrolysis reactor, and C/N=15, CaO/VS=0.15, water ratio=95%, time 0.5d.Produce in the hydrogen reactor, planting mud and substrate volume ratio is 0.5,35 ℃ of temperature, time 3d.In the methane-producing reactor, planting mud and substrate volume ratio is 0.3,40 ℃ of temperature, time 10d.The hydrogen yield that obtains is 44mL/gVS, and methane production is 93mL/gVS.

Claims

1, the method for a kind of municipal sludge and rubbish mixed fermentation High-efficient Production hydrogen and methane is characterized in that adopting following processing, production technique:

(1) planting mud prepares: produce methane kind mud and adopt Sewage Plant anaerobic digestion active sludge, producing hydrogen kind mud is to utilize Sewage Plant anaerobic digestion active sludge to obtain through heat treated and activation, promptly get the anaerobic digestion active sludge air-dry, grind, sieve, heat 2h down at 105 ℃, kill non-sporeformer methanogen, to add in the 3g/L glucose nutrient solution through anaerobic activated sludge that heat treated is crossed, transfer pH to 6.5,35 ℃ of activation 24h and make and produce hydrogen kind mud down;

(2) alkaline hydrolysis: the rubbish that will remove behind the non-degradable organism is wherein pulverized, is sieved, get lime, pulverize, sieve, adopt primary sludge, excess sludge, thickened sludge or the dewatered sludge of Sewage Plant, with pack into alkaline hydrolysis reactor and mix of above-mentioned mud, rubbish and lime, make the carbon-nitrogen ratio C/N of mixture remain on 10-30, lime and organism ratio C aO/VS remain on 0.05-0.2, water ratio remains on 85%-99%, and the alkaline hydrolysis reaction times is 0.5-3d;

(3) produce hydrogen: the mixture behind the alkaline hydrolysis is pumped into the product hydrogen reactor, is the ratio adding product hydrogen kind mud of 0.1-0.5 in kind of mud and substrate volume ratio, mixes, and starts and produces hydrogen reactor, 30 ℃-60 ℃ of temperature, reaction times 3-8d;

(4) produce methane: the remaining mixture that will produce behind the hydrogen pumps into methane-producing reactor, is that the ratio of 0.1-0.5 adds product methane kind mud in kind of mud and substrate volume ratio, mixes startup methane-producing reactor, 30 ℃-60 ℃ of temperature, reaction times 7-15d.