Composting

Composting is environmentally friendly and costs less then using landfills in the long run. The resulting compost will be used in soil reclamation (oil well sites, industrial plant sites, pipeline right of ways), agriculture, mulch for tree plantings and erosion control.. Because the organic waste sent to the landfill is decreased, the methane gas escaping from the landfill is also decreased. The composting facility produces mostly carbon dioxide and water. CO₂ is far less damaging to the environment than methane.
 

 This flow chart essentially shows what happens at APPIA's Composting Facility, with the largest co-composting plant in Bangladesh.







Tipping Floor:
Oversized articles (furniture, mattresses etc.) are removed and transported to the landfill. The remainder is dumped into the mixing drums.

Mixing:
Biosolids (sewage sludge) are brought to the plant from the sludge lagoons and mixed with the garbage. This adds necessary moisture and carbon/nitrogen. The Biodegradable garbage starts to break down beginning the composting process.

Screening:
The screen removes the larger non-biodegradable garbage. The remainder travels by conveyer to the aeration building.

Composting:
The compost is turned and air is circulated through it for approximately 28 days.

Compost Refining:
Screens, air separation and magnetic separation is now used to try and remove any remaining non-biodegradable garbage.

Odour Treatment:
Organic biofilters and chemical treatments are used to control any odour escaping from the plant.