Overview
Organic wastes from Municipalities and Industries have a huge potential to harness power from them. Thousands of liters of  effluent are generated by industries like starch,  distillery and food processing units. The raw effluent  contains very high Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD).   Treating the waste as a resource by biodigestion generating biogas and in turn green power. There are challenges to be met, but it requires a mind-set change and work towards a brighter future.
Biogas

Applications
Wastewater Streams coming from the following industries are treated using  IR technology or UASB technology.  Biodigestion followed by Biogas recovery makes it a viable proposition.

  • Hotel/Kitchen Wet Waste
  • Municipality Sewage
  • Breweries / Distilleries/Wine
  • Paper and Pulp Industry
  • Dairy / Food / Juices
  • Animal Houses / Slaughter House
  • Vegetable Oil Refineries
  • Starch Industry
  • Petrochemical and Refinery
  • API / Organic Chemicals

Features and Benefits

  • Net energy production   (biogas can cover up to 5 % of steam demand)
  • Conversion of wastewater into valuable energy
  • Compact treatment system /Smaller Footprints
  • High Recovery Of Biogas
  • Reduction Of Sludge
  • High return on investment
  • Up to 90% savings on discharge costs
  • Low operational costs
  • No sludge discharging costs;

Process Operation

Process wastewaters is taken into and  Equalization Tank which is mixed by a submersible mixer. The Flow and organic loading fluctuations are  balanced in this tank. The wastewater streams are pumped to static screens where particulates bigger than 0,3 mm are separated. The Wastewater pH is adjusted and required nutrients are mixed. IR Reactors are used for anaerobic stage. High organic loads are digested in the IR Reactor by anaerobic microorganisms and biogas is collected from the top of the reactor.

  • COD range of 1,000-150,000 mg/l
  • Able to treat loads from 20 kg up  to 5000 kg COD/day
  • Congestion-free influent system
  • Unique settling system
  • Congestion-free influent system
  • Designs available in – GRP, AISI 304/316 and RCC

Produced biogas can be burnt into the flare or utilized. In the lower reactor compartment most of the organic components are converted into methane and carbon dioxide. This gas mixture, or ‘biogas’, is collected in the lower level phase separator. This generates a ‘gas lift’, which forces the water upwards through the riser into the liquid/gas separator on to the top of the reactor. The biogas leaves the reactor through this separator, and the water returns through the downer back to the bottom of the system.

Anaerobically treated wastewaters now enter aeration tanks and are treated aerobically. Very special and efficient aeration systems are used to keep the aeration energy low.

There is a lot of work already done in India, see this Youtube Video documentary made by World Bank. We seek partners , investors in various projects which have planned in the coming years to make Wealth / Energy from Waste