Why Discharge Standards Drive Equipment Selection

Every EPC water treatment project begins with one question: “What are the discharge limits?” The answer determines process selection, equipment sizing, chemical dosing requirements, and ultimately 30-50% of total project CAPEX.

Failure to meet discharge standards means project rejection, penalties, and reputational damage. This guide compares the key effluent standards across Saudi Arabia, Indonesia, and Vietnam — the three markets where Yixing Environmental operates — and translates regulatory requirements into practical equipment specification guidance.

1. Saudi Arabia: PME Environmental Standards

1.1 General Industrial Discharge to Sea

Parameter	PME Limit	Typical Petrochemical Influent	Required Treatment
BOD₅	20 mg/L	500-2,000 mg/L	Biological + polishing
COD	100 mg/L	2,000-10,000 mg/L	DAF + advanced oxidation + biological
TSS	40 mg/L	200-1,500 mg/L	DAF / sedimentation + filtration
Oil & grease	5 mg/L	200-2,000 mg/L	DAF + coagulant (critical requirement)
Total nitrogen	10 mg/L	20-100 mg/L	Anoxic zone + MBR
Total phosphorus	2 mg/L	5-20 mg/L	Chemical precipitation + biological
Phenol	0.5 mg/L	50-500 mg/L	Ozone catalyst (mandatory)
Heavy metals (each)	0.1-1.0 mg/L	Variable	Chemical precipitation + filtration

1.2 Municipal Wastewater (NWC Standards)

• Class A reuse: BOD <10 mg/L, TSS <5 mg/L, TN <5 mg/L — requires MBR treatment
• Class B reuse: BOD <20 mg/L, TSS <15 mg/L — conventional biological + tertiary filtration
• Sea discharge: BOD <30 mg/L, TSS <40 mg/L — standard activated sludge sufficient

1.3 Saudi Compliance Requirements

• SASO certification: Required for electrical equipment and control panels
• Saudi Made: Projects with ≥40% local content get procurement preference
• Environmental Impact Assessment (EIA): Mandatory for all new industrial facilities
• Self-monitoring: Monthly discharge sampling and reporting to PME
• Penalty structure: Fines up to $500,000 for non-compliance; facility shutdown for repeated violations

2. Indonesia: PP 22/2021 & Sectoral Standards

2.1 General Industrial Discharge

Parameter	PP 22/2021 Class I	PP 22/2021 Class II	Key Industries Affected
BOD₅	30 mg/L	50 mg/L	Palm oil, textile, mining
COD	100 mg/L	150 mg/L	Petrochemical, pulp & paper
TSS	50 mg/L	100 mg/L	All industries
Oil & grease	5 mg/L	10 mg/L	Palm oil, petrochemical
Total nitrogen	15 mg/L	30 mg/L	Food processing, livestock
Total phosphorus	2 mg/L	5 mg/L	Fertilizer, palm oil
pH	6-9	6-9	All industries
Temperature	≤40°C	≤45°C	Power plant, refinery

2.2 Palm Oil Mill Effluent (POME) Specific Standards

• Ministerial Regulation 5/2021: COD <350 mg/L, BOD <100 mg/L for land application
• River discharge: Much stricter — requires advanced treatment (DAF + biological + polishing)
• Zero discharge policy: Some provinces require complete recycle — containerized MBR + RO

2.3 Indonesia Compliance Framework

• TKDN (Domestic Content): Government projects require ≥40% local content
• Environmental permit (Izin Lingkungan): UKL-UPL document required before construction
• PROPER rating: Environmental compliance rating (Gold, Green, Blue, Red, Black) — affects bank financing
• Self-reporting: Quarterly effluent monitoring reports to KLHK (Ministry of Environment)
• Enforcement: Administrative fines + criminal prosecution for severe violations

3. Vietnam: QCVN 40:2011/BTNMT

3.1 Industrial Wastewater Discharge

Parameter	Column A (Sensitive)	Column B (Normal)	Typical Application
BOD₅	20 mg/L	40 mg/L	Food, pharmaceutical, electronics
COD	50 mg/L	100 mg/L	Chemical, petrochemical, textile
TSS	30 mg/L	60 mg/L	All industries
Oil & grease	2 mg/L	5 mg/L	Food processing, petrochemical
Total nitrogen	10 mg/L	20 mg/L	Industrial zones near water bodies
Total phosphorus	1 mg/L	3 mg/L	Phosphate industry, food processing
pH	6-9	6-9	All industries
Coliforms	3,000 MPN/100mL	5,000 MPN/100mL	Food, pharmaceutical, municipal

3.2 Vietnam Compliance Framework

• EU-Vietnam FTA: Environmental compliance required for export manufacturing — drives investment in wastewater treatment
• Industrial zone central WWTP: Factories must pre-treat to Column B before discharging to zone WWTP
• Direct discharge: Column A standards apply for discharge to rivers, lakes, and sensitive water bodies
• Environmental impact assessment: Required for all new industrial facilities (ĐTM document)
• Self-monitoring: Monthly sampling and annual compliance report to DONRE
• Penalties: Fines 50-500 million VND ($2,000-20,000) per violation; facility closure for repeated non-compliance

4. Cross-Country Comparison: Equipment Requirements

Regulatory Requirement	Saudi Arabia	Indonesia	Vietnam
Oil/grease limit	5 mg/L (strictest)	5-10 mg/L	2-5 mg/L (very strict)
COD limit	100 mg/L	100-150 mg/L	50-100 mg/L (strictest)
DAF requirement	Mandatory for petrochemical	Mandatory for palm oil	Mandatory for food processing
Ozone catalyst	Recommended for refractory COD	Optional	Recommended for Column A
MBR requirement	Required for reuse applications	Recommended for zero discharge	Recommended for Column A
Material specification	SS316L mandatory (high salinity)	SS304 minimum (tropical)	SS304 minimum (cost-effective)
Control/monitoring	SCADA mandatory (large projects)	PLC + HMI standard	SCADA for industrial zones
FAT requirement	Mandatory (NWC/SWCC projects)	Recommended	Preferred (cost-sensitive)

5. Equipment Selection by Discharge Target

For Oil/Grease ≤5 mg/L (Saudi & Vietnam strict limit)

• DAF system: Recycle-flow type, 30-50% recycle ratio, demulsifier dosing
• Sizing margin: 20% over design flow to handle shock loads
• Material: SS316L for Saudi (salinity), SS304 for Vietnam (cost)
• Polishing: Ozone catalyst or activated carbon if COD also strictly limited

For COD ≤50 mg/L (Vietnam Column A)

• DAF pre-treatment: Removes 30-40% COD (oil + suspended organics)
• Ozone catalyst: Destroys refractory organics that resist biological treatment
• MBR final stage: Achieves COD <50 mg/L consistently
• Combined cost: DAF + ozone + MBR = $0.25-0.40/m³ OPEX (competitive vs. carbon adsorption)

For BOD ≤20 mg/L with Reuse (Saudi Class A)

• MBR mandatory: Only technology guaranteeing BOD <10 mg/L and TSS <5 mg/L
• Containerized option: Fast deployment for remote sites, modular expansion
• UV/Ozone disinfection: Additional barrier for coliform removal in reuse applications

6. Compliance Documentation Checklist

1. EIA / UKL-UPL / ĐTM: Environmental impact assessment (country-specific format)
2. FAT report: Factory acceptance test with witnessed performance data
3. Material certificates: EN 10204 3.1 for all pressure-bearing components
4. Performance guarantee: Defined test conditions, sampling protocol, acceptance criteria
5. SASO / SNI / TCVN certifications: Country-specific standards compliance documentation
6. Commissioning report: Including 24-hour continuous run data
7. O&M manual: Local language section mandatory (Arabic, Bahasa, Vietnamese)
8. Monthly monitoring plan: Sampling points, parameters, frequencies per local regulations

Get compliance-ready equipment specifications: Contact our regulatory affairs team with your project location and discharge target — we provide country-specific equipment recommendations and documentation templates.

FAQ: Discharge Standards Compliance

Q: What happens if our treatment system fails to meet discharge limits?
A: Penalties range from fines ($2,000-500,000) to facility shutdown. In Saudi Arabia, PME can order immediate production cessation. In Vietnam, DONRE issues compliance notices with 90-day deadlines. Indonesia’s PROPER system downgrades ratings, affecting bank financing and export licenses.

Q: Can a single treatment system meet all three countries’ standards?
A: A DAF + ozone catalyst + MBR treatment train achieves the strictest limits (Vietnam Column A / Saudi sea discharge). The same system, with minor adjustment to chemical dosing and ozone dosage, meets Indonesian Class I standards. This “design for the strictest” approach simplifies procurement and documentation.

Q: How often do these standards change?
A: Saudi PME updated standards in 2024 (tightened oil/grease limits). Indonesia’s PP 22/2021 replaced older PERGUB regulations. Vietnam reviews QCVN standards every 5 years. We monitor regulatory updates and provide clients with advance notice of changes affecting existing installations.