CPCB Effluent Standards for Ship Breaking and Recycling — Explained

India's Ship Breaking Industry

India accounts for approximately 30–35% of global ship recycling by tonnage — making it one of the world's most significant ship breaking nations. The industry operates primarily at:

• Alang, Gujarat: The world's largest ship recycling beach — 10 km of intertidal coastline on the Gulf of Khambhat hosting 150+ individual ship recycling plots. Ships are beached at high tide and dismantled as the tide recedes. GPCB is the primary regulator.
• Darukhana, Mumbai: Smaller dry-dock based yards in Mumbai harbour — more controlled environment compared to Alang's beaching method.
• Economic significance: Ship breaking at Alang alone generates 3–4 million tonnes of steel scrap annually — a significant recycled steel input for India's secondary steel sector. Also recovers non-ferrous metals, machinery, furniture, and equipment for resale.

The ship breaking industry faces intense environmental scrutiny from NGOs, international regulators, and the Basel Convention because of the hazardous materials found in end-of-life vessels.

CPCB Regulatory Framework for Ship Recycling

Ship breaking in India is regulated under a layered framework:

• Environment (Protection) Act 1986: Effluent standards under Schedule VI apply to all discharges from yard operations.
• CPCB Guidelines for Ship Breaking Yards (2009, revised): Require pre-cleaning certificates for tanks, hazardous inventory documentation, impermeable yard surfaces, oil water separators, and ETP installation.
• HWM Rules 2016: Govern generation, storage, transportation, and disposal of asbestos, PCBs, oily sludge, lead paint waste, and other hazardous waste from ship dismantling.
• Hong Kong International Convention for Safe and Environmentally Sound Recycling of Ships (2009): India ratified in 2019. Requires Ship Recycling Facilities (SRFs) to be approved and ships to have an Inventory of Hazardous Materials (IHM) before recycling. Implementation deadline: 2024–2025 for Indian yards.
• National Green Tribunal orders: Multiple NGT orders have directed GPCB and MoEFCC to improve monitoring and enforcement at Alang — resulting in mandatory ETP, improved yard surfaces, and restricted plot operations for non-compliant yards.

Hazardous Materials in Ships and Effluent Sources

Key hazardous materials and effluent sources from ship dismantling:

• Residual bunker fuel and bilge water: Even after tank pre-cleaning, ships contain residual heavy fuel oil, lube oil, and bilge water in cofferdam spaces, bilge wells, and structural voids. These generate oily water requiring oil-water separation before any discharge.
• Anti-fouling paint (TBT): Older vessels have hull coatings containing tributyltin (TBT) — an endocrine disruptor banned in new vessels since 2008 but present in legacy ships. TBT leaches into intertidal sediment during hot work and hull cutting.
• Lead paint dust: Mechanical scaling and blasting of lead-containing anti-corrosion paint generates dust and washings with high lead concentration. Runoff from cutting areas is a major lead contamination pathway.
• Cutting water and hot work washings: Gas cutting and welding operations generate sparks, scale, and metal oxides that wash off during rain or hosing operations.

CPCB Effluent Discharge Standards

Oil and Bilge Water Management

Oil and bilge water management is the primary water treatment challenge at ship breaking yards:

• Pre-cleaning requirement: CPCB guidelines and the Hong Kong Convention require tank pre-cleaning (gas-freeing) before beaching — reducing residual oil in cargo tanks to a safe level. This is increasingly mandated before ships enter Indian ports.
• Yard drainage collection: CPCB-approved yards must have impermeable concrete surfaces with gradient drainage channels that collect all yard runoff (rainwater, wash water, cutting water) into a common collection sump before oil-water separation.
• API oil-water separator: Mandatory for all yards — removes free oil from collected yard drainage. Capacity sized for peak monsoon runoff flow rate plus process wash water. Oily sludge from API separator is hazardous waste requiring TSDF disposal.
• Recovery of bunker fuel: Residual heavy fuel oil from bilge pumping and tank cleaning is recovered by specialist contractors and either reprocessed or co-processed in cement kilns — not discharged.

Asbestos, PCB, and Heavy Metal Waste

Hazardous solid waste management — the dominant compliance challenge for ship breaking:

• Asbestos: Must be surveyed, wet-removed by trained workers with PPE, double-bagged, and sent to authorised asbestos landfill. Open burning or dumping is prohibited and carries criminal liability under EP Act. CPCB estimates 30–40% of ships at Alang contain asbestos insulation.
• PCBs: All PCB-containing equipment (transformers, capacitors marked with PCB labels or pre-1985 manufacture dates) must be removed intact, tested, and disposed via PCB-authorised handlers. PCB-contaminated oil is Category 1 hazardous waste under HWM Rules.
• Lead paint: Paint containing > 600 mg/kg lead (pre-1990 coatings) is hazardous waste. Mechanically removed lead paint scale should be collected, not water-washed to sea. Encapsulation on intact surfaces is preferred over mechanical removal.
• Mercury instruments: Compass bearings, pressure gauges, and navigation instruments containing mercury must be removed and segregated before hot work begins. Mercury spills on intertidal sediment are extremely difficult to remediate.

ETP Design for Ship Breaking Yards

ETP design requirements for a CPCB-compliant ship breaking yard:

• Impermeable yard surface (RC concrete or HDPE lining) with perimeter bund and graded drainage to collection sumps
• API oil-water separator — sized for peak yard drainage flow (typically 50–200 m³ per monsoon storm event)
• Settling tank for suspended solids from metal cutting areas
• pH adjustment if acidic cleaners used for tank cleaning
• Monitoring point with flow meter and sampling port at final discharge
• Separate hazardous waste storage area with impermeable flooring, roof cover, and secondary containment — for asbestos bags, PCB equipment, and oily sludge awaiting authorised disposal

Compliance Under Hong Kong Convention

Hong Kong Convention compliance and current requirements for Indian yards:

• Ship Recycling Facility (SRF) authorisation: Under India's implementation, yards must be authorised as SRFs by the Central Government (Ministry of Shipping). Authorisation requires ETP, hazardous waste handling facilities, worker safety systems, and environmental management plan.
• Inventory of Hazardous Materials (IHM): Each ship must have an IHM listing all hazardous materials above threshold quantities (asbestos, PCBs, TBT, ODS, lead, mercury) before recycling. Yard must plan removal sequencing based on IHM.
• Statement of Compliance (SoC): Final recycled ship generates a Statement of Completion documenting what hazardous materials were found and how they were disposed — required for yards selling scrap to steel mills in export markets that require Hong Kong Convention compliance documentation.
• GPCB monitoring: Alang yards are subject to GPCB inspection under the Water Act CTO. Non-compliant yards face consent refusal, plot closure, and environmental compensation under NGT orders.

Frequently Asked Questions