"Four in One" Mode

Biogas project is developing from a single waste treatment plant to a regional waste treatment center integrating "environmental protection + clean energy + carbon emission reduction + ecological agriculture":

1. Multiple mixed raw materials;

2. Third party investment;

3. Professional company operation to realize the commercial operation of project.

Biogas acts as a link to turn agricultural waste into resource. While solving agricultural pollution, reducing CO2 emission and improving rural ecological environment, biogas project provides clean renewable energy and organic fertilizer, improves ecological environment, improves soil fertility, promotes positive cycle and sustainable utilization of ecological environment, and realizes "environmental protection, carbon emission reduction, clean energy and circular agriculture"-Four in One Mode. This sustainable circular agricultural development mode can truly achieve high unity of social, economic and ecological benefits.

Pretreatment

• Hydrolysis sand removal technology and equipment.

Basic principle: Under function of agitation and hydrolysis, excrement and sand are separated, and sand is lifted outside of tank by screw conveyor for removal, so as to avoid deposition, blocking and wearing of shell powder and sand in the anaerobic tank and pipeline, and ensure the normal operation of the subsequent process.

Technical features: 

① high efficiency: coarse sand removal efficiency can reach over 90%; 

② simple operation and maintenance

Scope of application: suitable for pretreatment of chicken manure, cattle manure and other livestock manure mixed with gravel impurities

Reference: Taiwan Shi'an Farm 0.8MW Chicken Manure Biogas Power Generation Project, Jiangsu Dafeng Manure Treatment Center 12000 m3 Bio Methane Project, etc.

• Bionic hydrolysis technology of straw

Basic principle: by imitating the working principle of cow's stomach to degrade cellulose, "crushing + hydrolysis + anaerobic" is applied to produce biogas and increase the conversion rate of cellulose.

Bionic technology: principle of rumen simulation can be applied to straw pretreatment. Two-times crushing of silage or yellow straws is carried out, followed by medium temperature hydrolysis and acidification for 2 days. The processes can shorten anaerobic fermentation retention time by 50% and improve the gas production efficiency.

Anaerobic unit

Wet anaerobic fermentation technology

1. Main technical advantages of high concentration and high ammonia nitrogen high efficiency anaerobic fermentation technology:

(1) TS feed concentration is 8% ~ 12%;

(2) The volume gas production rate is more than 1.0 m3/m3;

(3) The tolerance concentration of ammonia nitrogen can be increased to 6000 mg /L, which is twice higher than conventional tolerance concentration (3000 mg/L);

(4) It is not necessary to adjust the carbon nitrogen ratio of raw materials, reduces working procedures and saves investment.

2. Main technical advantages of high-efficiency and energy-saving anaerobic special stirring technology:

(1) Low speed energy-saving design, unit tank volume installed power 5W/ m3, more than 50% energy saving than conventional mixer;

(2) Special new sealing technology is adopted to solve problems of easy abrasion, easy leakage and difficult maintenance and replacement of mechanical seal. It provides reliable performance and maintenance free feature.

(3) Double or three-layer paddle design and equipped with shell breaking device, effectively preventing sediment, scum and crusting in the tank.

• Semi-dry anaerobic fermentation technology

Main technical advantages:

(1) The TS concentration in the tank can reach about 14%

(2) The volume gas production rate is high, reaching more than 1.5m3/m3

(3) Less process water consumption and less production of biogas slurry

(4) Small floor area, especially suitable for projects with limited site.

• Dry anaerobic fermentation technology

Main technical advantages:

(1) The content of dry matter ranged from 18% to 45%;

(2) The volumetric gas production rate is high, which can be more than 3m3/m3d;

(3) Process water consumption is small, biogas slurry output is small or even no production;

(4) Strong adaptability to raw materials.

Biogas Purification and Storage

Methane desulfurization equipment

Basic principle: By using Thiobacillus, under certain temperature, humidity and micro oxygen conditions, hydrogen sulfide is oxidized into sulfur or sulphurous acid.

Technical features: 

① high efficiency: the desulfurization efficiency can be over 98%; 

② low cost: the operation cost is over 70% lower than that of traditional chemical desulfurization; 

③ no pollution: no need to add chemicals, no secondary pollution; 

④ easy to maintain: the operation of the process is simple and easy to maintain.

Scope of application: biogas power generation, biogas boiler or torch biogas desulfurization treatment. Single set treatment capacity: 100 ~ 200m3 biogas/h.

Double membrane dry spherical gas holder

Basic principle: the double membrane dry type gas holder is composed of outer membrane, inner membrane, bottom membrane and concrete foundation. The inner cavity enclosed by inner membrane and bottom membrane is used to store biogas. Cavity between outer membrane and inner membrane is airtight. The outer membrane is inflated in the shape of a sphere. The gas storage tank is equipped with explosion-proof blower, which can keep the air pressure in the gas tank stable.

Technical features: 

① safety: adopt low-pressure gas storage technology, which is 1200 ~ 3500Pa, to ensure more secure gas storage ② durability: the main body of membrane gas storage device is made of biogas special membrane material, with special PVC coating, which can resist ultraviolet, hydrogen sulfide corrosion, methane gas penetration, folding, aging and tensile strength 

③ low temperature resistance: it can resist impact of strong wind, snow, freezing and other severe weather. Applicable temperature - 30 ~ 60 ℃, freezing phenomenon will not appear in winter in cold area, ensuring safe operation 

④ low manufacture cost: 30% ~ 60% lower than traditional wet gas holder 

⑤ single set volume: 100 ~ 5000m3

Scope of application: buffer storage of gas consumption unit in post section .

High-value utilization of products

High-value utilization technology of Biogas

Cogeneration technology: zero emission mode (electricity + heat)

(1) Biogas is used for power generation;

(2) The waste heat of generator is used for the self-heating of anaerobic system and other heat consumption processes.

Biogas purification technology: 

PSA(Pressure Swing Adsorption), pressurized water washing, membrane separation

1. PSA Technology:

Basic principle: the adsorption capacity of adsorbent for each component in the gas mixture varies with the change of pressure, and different gas components in the mixture are selectively adsorbed to achieve separation.

Technical features: ① the recovery rate of methane is more than 95%; 

② the concentration of methane after purification is more than 97%; 

③ the investment is relatively low; 

④ the process is easy to operate and maintain; 

⑤ there is no chemical pollution;

Scope of application: for biogas decarbonization and purification, production of bio-methane for vehicle, civil and industrial usage.

2. Pressurized water washing technology:

Basic principle: the absorption and separation of CO2 are realized by the different solubility of CO2 and CH4 into the water under pressure.

Technical features: 

① the recovery rate of methane can reach over 97%; 

② the concentration of methane after purification can reach over 97%; 

③ the operation cost is low; 

④ only a certain amount of water is needed without chemical pollution; 

⑤ the process is easy to operate and maintain

Scope of application: for biogas decarbonization and purification, production of bio-methane for vehicle, civil and industrial usage.

3. Membrane separation technology:

Basic principle: under the differential pressure on both sides of the membranes, the gas components of CO2 and CH4 permeate through the fiber membrane at different rates

Technical features: 

① the recovery rate of methane can reach over 97%; 

② the concentration of methane after purification can reach over 97%; 

③ there is no chemical pollution; 

④ it is less affected by low temperature environment; 

⑤ the membrane module can be flexibly increased or decreased according to the treatment scale; 

⑥ the process is easy to operate and maintain

Scope of application: for biogas decarbonization and purification, production of bio-methane for vehicle, civil and industrial usage

Comprehensive utilization of biogas slurry and digestate

(1) Production of high-end liquid organic fertilizer by biogas slurry concentration

(2) Production of solid organic fertilizer from digestate