Straw Biogas Plants

To solve the bottleneck problem of straw biogas plants, DeTong cooperates with BEB Berlin for DeTong straw pretreatment and agitation technologies.

Advantages of Straw Biogas Technology

Larger range of availability of raw materials, thereby solving the problem in regard to source of feeding materials for biogas production, as well as blazing a new trail for straw recycling.
High gas yield, i.e. around 100~150m3 biogas can be produced by straws in every mu (666.67m2) of land throughout each season
The straw-to-biogas process is a clean production process. The remaining slurry can be used in the moisture control of next batch of digested materials, thus realizing the cyclic utilization and also reducing the slurry discharge prominently
The energy utilization value of biogas produced by straw is higher than that obtained from direct combustion & thermal pyrolysis of straw (i.e. For every kilogram of straw, the amounts of energy generated through biogas digestion, direct combustion and thermal pyrolysis are 2.9~5.9MJ, 1.5~1.9MJ and 1.2~1.5MJ respectively.)

Pretreatment Facilities

The pretreatment for straw is the key process for the operation of a straw biogas plant. DeTong provides the straw raw material for pretreatment process concept aiming at different kinds of straw as corn, rice, or wheat straw.
DeTong´s straw pretreatment facilities are able to shred, extrude, mix, and to feed the substrate into the digester, safely and stably. Multiple assemblies would be provided by DeTong, according to different kinds of pretreatment processes, to meet the requirement of raw material quality.

Agitation Facilities

DeTong straw agitation facilities are made up by a vertical flow guidance agitator and at least one horizontal agitator. The floating material would be sucked to the bottom of the digester by the tube of the vertical agitator, to entirely mix the substrate. DeTong agitation system is reliable, stable, energy saving, and able to solve various problems for straw biogas plants.

Further Details

A straw-biogas project employs straw as the principal raw material, which is subjected to anaerobic digestion in order to produce both biogas and biogas fertilizer – The former is utilized in rural production and livelihood so as to improve the living conditions of rural households, while the latter realizes the “waste-to-manure” transition process thus improves the fertility of soil. Straw-biogas projects can not only protect ecological environment but also serve as a main measure for both agricultural energy saving & emission reduction and development of renewable energy sources.

Main Processes associated with Straw-Biogas Projects:

Garage-Type Dry Digestion Process (Anaerobic Solid State Digestion Process or ASSD)
Completely Mixed Continuous Anaerobic Digestion Process (CSTR)
Completely Mixed Self-Carrier Bio-Film Anaerobic Digestion Process (MMSB)
Vertical Plug-Flow Anaerobic Digestion Process (VPF)
Combined Two-Phase Anaerobic Digestion Process (CTP)
Membrane-Covered Trough Anaerobic Digestion Process (MCT)

Advantages of Straw Biogas Technology

Pretreatment Facilities

Agitation Facilities

Further Details

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