Introduction: Indonesia’s POME Challenge by the Numbers

Indonesia produces over 46 million tonnes of crude palm oil annually, making it the world’s largest palm oil producer. Every tonne of CPO generates approximately 2.5–3.0 m³ of POME — a hot (80–90°C), highly acidic (pH 4.0–4.5), and organically loaded effluent with BOD₅ levels reaching 25,000–30,000 mg/L and COD exceeding 50,000 mg/L. For EPC contractors bidding on Indonesian mill upgrade projects, the technical and economic decisions around POME treatment directly determine project viability.

Traditional open ponding systems — still used by ~85% of Indonesian mills — are facing regulatory extinction. The Peraturan Menteri Lingkungan Hidup No. 5/2014 mandates BOD₅ discharge limits of 100 mg/L, with regional governments in Riau, North Sumatra, and Central Kalimantan enforcing tighter 60–80 mg/L thresholds. This regulatory squeeze is creating a $1.2 billion treatment equipment replacement market over 2026–2030.

POME Characteristics: Why Conventional Treatment Fails

Parameter	Typical POME Value	Indonesian Discharge Limit	Gap
BOD₅	25,000 mg/L	100 mg/L	99.6% removal needed
COD	50,000–60,000 mg/L	350 mg/L	99.3% removal needed
TSS	18,000–25,000 mg/L	250 mg/L	98.6% removal needed
Oil & Grease	5,000–8,000 mg/L	25 mg/L	99.5% removal needed
Temperature	80–90°C	≤38°C	Cooling required
pH	4.0–4.5	6.0–9.0	Neutralization required
Total Nitrogen	600–800 mg/L	50 mg/L	92% removal needed

The combination of extreme organic load, high temperature, low pH, and emulsified oil makes POME one of the most challenging industrial effluents. Single-stage solutions — whether purely biological or purely physical — inevitably fail. The only proven compliance pathway is a three-stage integrated system: primary oil recovery + DAF, secondary anaerobic digestion, and tertiary aerobic polishing.

Stage 1: Primary Treatment — DAF for Oil Recovery and Solids Removal

The first defense against POME is a properly sized Dissolved Air Flotation (DAF) unit placed immediately after the cooling/equalization basin. POME enters the DAF at 35–40°C after cooling, with free oil already skimmed in the equalization tank. The DAF targets emulsified oil, colloidal solids, and residual suspended matter that would otherwise blanket anaerobic reactors.

DAF Sizing for a 60-Tonne/Hour Mill (Standard Indonesian Capacity)

• Design flow: 45–60 m³/h (POME generation ~0.75 m³/tonne FFB × 60 t/h)
• Surface loading rate: 5–7 m³/m²·h (conservative for high-COD POME)
• DAF unit footprint: ~12–14 m² (rectangular, 6.0 × 2.2 m)
• Air-to-solids ratio: 0.03–0.05 kg air/kg solids
• Recycle ratio: 25–35% (pressurized recycle stream)
• Expected removal: 60–70% TSS, 85–95% O&G, 30–40% COD
• Chemical dosing: PAC (150–250 mg/L) + cationic polymer (2–5 mg/L)
• Sludge production: ~1.5–2.5 tonnes dry solids/day

Recovered oil from the DAF float layer is a revenue asset — it can be sold back to the mill for re-refining or used as boiler fuel, offsetting 3–5% of treatment OPEX. The DAF underflow (COD reduced to ~30,000–35,000 mg/L) proceeds to anaerobic treatment.

Stage 2: Anaerobic Digestion — COD Destruction and Biogas Recovery

The anaerobic stage is the workhorse of POME treatment, converting 85–95% of remaining biodegradable COD into methane-rich biogas. Two reactor configurations dominate the Indonesian market:

Option A: Covered In-Ground Anaerobic Reactor (CIGAR)

• HRT: 15–25 days
• OLR: 3–5 kg COD/m³·day
• Footprint: Large (3,000–5,000 m³ earthen pond with HDPE cover)
• CAPEX: $150,000–$250,000
• Advantage: Lowest cost, simple construction
• Disadvantage: Land-intensive, difficult sludge removal

Option B: UASB (Upflow Anaerobic Sludge Blanket)

• HRT: 6–12 hours
• OLR: 8–15 kg COD/m³·day
• Footprint: Compact (200–400 m³ tank)
• CAPEX: $350,000–$550,000
• Advantage: Small footprint, high-rate, proven globally
• Disadvantage: Requires granular sludge, sensitive to TSS spikes

Biogas Economics

A 60-TPH mill generates 28–35 m³ biogas per tonne POME, with 60–65% methane content. This translates to 1.2–1.8 MW of electrical equivalent — enough to power the entire treatment plant plus 30–50% of mill operations. With Indonesia’s PLN feed-in tariff for palm biomass at IDR 1,450/kWh (~$0.09), biogas-to-power can recover 40–60% of treatment CAPEX within 5 years.

Stage 3: Aerobic Polishing — Meeting the 100 mg/L BOD Target

Anaerobic effluent (COD: 1,500–3,000 mg/L, BOD: 300–600 mg/L) requires aerobic polishing to meet discharge standards. The preferred configuration for Indonesian mills is:

• Extended aeration activated sludge or sequencing batch reactor (SBR)
• HRT: 18–24 hours
• MLSS: 3,000–4,000 mg/L
• F/M ratio: 0.15–0.25 kg BOD/kg MLSS·day
• Final clarifier surface rate: ≤0.8 m³/m²·h

For mills with space constraints or land-use restrictions (common in Riau and North Sumatra where plantation expansion competes with treatment land), a containerized MBR replaces the secondary clarifier, achieving effluent BOD below 20 mg/L with a footprint reduction of 60–70%.

EPC Decision Matrix: Three Treatment Configuration Paths

Configuration	CAPEX (USD)	OPEX (USD/year)	Land (m²)	Effluent BOD	Payback
Open Pond + DAF (Baseline — Non-Compliant)	$80,000–$120,000	$15,000	8,000+	500–1,000 mg/L	N/A
DAF + CIGAR + Activated Sludge	$400,000–$600,000	$45,000	5,000–7,000	80–150 mg/L	4–6 years
DAF + UASB + MBR (Full Compliance)	$750,000–$1,100,000	$65,000	1,500–2,500	≤20 mg/L	5–8 years
DAF + UASB + MBR + RO (Reuse-Ready)	$1,200,000–$1,600,000	$90,000	2,000–3,000	≤5 mg/L	6–10 years

EPC recommendation: For mills with biogas monetization (grid-connected or on-site power), the DAF+UASB+MBR configuration delivers the best ROI. The biogas revenue stream offsets 40-60% of annual OPEX, compressing effective payback to 3–4 years.

Indonesian Market Landscape: Where the Deals Are

The Indonesian palm oil sector spans ~800 active mills, with concentration in three provinces:

• Riau: 180+ mills, strict provincial BOD enforcement since 2024
• North Sumatra: 140+ mills, largest CPO processing hub
• Central Kalimantan: 120+ mills, rapid expansion with weak existing treatment

Key procurement patterns for EPC contractors:

• ISPO (Indonesian Sustainable Palm Oil) certification requires compliant wastewater treatment — a non-negotiable for mills exporting to EU/US markets under EUDR
• Mill groups (Wilmar, Golden Agri, Sinar Mas, Astra Agro) are standardizing treatment designs across estates, creating multi-mill template deployment opportunities
• EPC procurement is centralized at group headquarters (Jakarta/Singapore), but technical evaluation involves on-site mill managers
• Financing: ADB Green Climate Fund and IFC Sustainable Palm Oil Facility offer concessional loans for biogas-capture treatment systems

Why Yixing Feiran Environmental?

As a specialized manufacturer of DAF systems, screw presses, and containerized MBRs, Yixing Feiran Environmental delivers the core equipment package for all three POME treatment configurations. Our high-rate DAF units are engineered for POME’s specific challenges — corrosion-resistant 304SS construction, optimized air dissolution for high-temperature operation, and integrated chemical dosing skids. For EPC contractors bidding on Indonesian mill upgrades, we provide process guarantees, commissioning support, and competitive EXW pricing with 8–10 week lead times.

Get a POME Treatment Equipment Quote →

For EPC contractors: request our POME treatment equipment datasheet including DAF sizing calculator, UASB design guide, and reference list from Indonesian palm oil projects.