Types of waste ponds and their functions
1. Cooling Pond
Cooling Pond Palm Oil Mill Effluent is a place or sludge storage pool to reduce the raw sludge temperature of the sludge pit, which is + 70 – 80oC to + 40 – 45oC to suit mesophilic bacteria.
2. Mixing Pond
Mixing Pond Palm Oil Mill Effluent is a place or sludge storage pond after cooling from the cooling pond to neutralize the pH of the raw effluent by mixing the sludge from the anaerobic pond with a certain ratio. The ratio used is 1: 3, where for example, if the feeding from the cooling pond to the mixing pond is 200 tons / hour, then the back mix from anaerobic to the mixing pond is 600 tons / hour.
3. Anaerobic Pond
Anaerobic Pond Palm Oil Mill Effluent is a storage pool for remodeling organic materials contained in wastewater using mesophilic bacteria. Where these bacteria can live with the following conditions:
1. Neutral pH, namely 6-9.
2. The temperature of the anaerobic pool is maintained between 30-40oC.
3. Adequate nutrition contains Nitrogen and Phosphate.
4. The pool depth is 5-6m.
5. Strive to make efforts to accommodate the waste for 2 days.
4. Contact Pond
Contact Pond Palm Oil Mill Effluent is a temporary storage pond for liquid waste from the anaerobic pond before being pumped into the land application.
5. Aerobic Pond
Aerobic pond is a liquid waste storage pool that aims to reduce organic materials by using aerobic bacteria.