Palm Oil Mill Effluent Treatment: New Zero-Discharge Technology
Palm Oil Mill Effluent (POME) is one of the biggest environmental challenges in the palm oil industry. A typical palm oil mill generates 0.6-0.7 tons of effluent for every ton of FFB processed. This article reviews current treatment technologies and the emerging zero-liquid-discharge (ZLD) approach.
Current POME Treatment Methods
1. Ponding System (Traditional)
The most common method in Southeast Asia, using a series of anaerobic and aerobic ponds. While low-cost, it requires large land areas and produces methane emissions.
- COD Reduction: 95-97%
- Land Requirement: 1-2 hectares per 30 TPH mill
- Retention Time: 60-90 days
2. Biogas Capture System
Captures methane from anaerobic digestion for power generation. This is increasingly popular as it turns waste into energy.
- Biogas Yield: 20-28 m³ per m³ of POME
- Power Generation: 0.5-1.0 MW for a 30 TPH mill
- ROI: 2-3 years
3. Zero-Liquid-Discharge (ZLD) System
The most advanced approach, treating POME to recover clean water for reuse and producing solid fertilizer as by-product.
- Water Recovery: > 90%
- Solid Fertilizer: 15-20% of POME volume
- No Liquid Discharge: Meets the strictest environmental standards
Choosing the Right System
The choice depends on mill capacity, local regulations, land availability, and budget. For new mills, we recommend at least incorporating biogas capture, as it provides both environmental compliance and energy savings.