Overview
Biogas is produced by  bio‐methanation of organic mass. This process releases immense energy rich gas. The new developments  in this area have increased the efficiency of these processes and the yields of the Biogas are increasing. This has made the route of  power generation a  more attractive option.

Biogas

DMT Biosulfurex and GE Engine

Applications 

  • Landfill
  • Sewage
  • Distilleries
  • Poultry farms
  • Dairies
  • Pulp and Paper plants etc.

Feature and Advantages
Depending on the process being used for example the distillery could produce from 8‐12 times the volume of alcohol distilled as a waste water which is also termed as Silage, Vinnase, or spent wash. This spent wash could have COD as high as 1,30,000 – 2,00,000 mg/lts and BOD in the 65,000 mg/lts range. This liquid when subjected to biomethanation in anaerobic digestors generates  high methane content (upto 50‐60%) biogas.

Process Operation

The sugar based distillery has very high H2S content in the Biogas going as high as 3.5-4% in the feed. The Biochemical process has been used to remove the Sulfur, but the caustic consumption and the power cost of this plant is very high. Where aerobic digestate is available we offer the Hybrid technology which uses a two stage process by way of which 90% of the Caustic used is recovered back, and the final purified gas has no variation in parameters.

 

In biogas the acid gas can cause corrosion of i.e. piping and engines, preventing gas utilization without pre‐treatment.
Until a few years ago, the only possibility to treat these gases was using Chemical scrubbers or alternate technologies,which were either very costly on operating costs or were not eco‐friendly. With the environmental pressures mounting, a need to develop newer greener technologies was felt which would meet the environmental demands and were costeffective.
Until recent the removal of H2S is usually done by a chemical system due to the ultra high concentrations of H2S (up to 5%v/v). This leads to acidification and/or clogging of bio‐ (trickling) filters. Chemical systems are also thought to be much more reliable and they occupy a much smaller footprint. But with the development of sophisticated plastic materials as bacterial carrier material for bioreactors it is now also feasible to biologically treat polluted (bio)gas stream with high concentrations of H2S1. In the near future biological treatment may even surpass chemical treatment of H2S as most favourable process.

  • Chemical Desulfurisation uses Chemicals for neutralising
    Range : upto 5000 ppm H2S
  • Biological Desulfurisation Biological treatment using bacteria
    Range :More than 15000 ppm and above
  • Biochemical Desulfurisation Biocehmical treatment
    Range : More than 15000 ppm and above

Route of Biogas usage 

  • Direct Power using Gas Engine
  • Compressed CBG – Upgradation of Biogas