1. What is the Zero Liquid Discharge (ZLD) Model?
Zero Liquid Discharge (ZLD) is a water treatment process designed to completely eliminate wastewater discharge. In Dholera SIR, all wastewater is recycled and reused within the boundaries of the development.
- 100% Treatment Rate: Every drop of municipal and industrial sewage is treated using advanced membrane filtration, cyclic activated sludge, and reverse osmosis (RO) systems.
- Dual Water Lines: Dholera features a dual-water distribution network. While potable water is provided for drinking and domestic use, recycled water is piped separately for industrial cooling, boiler feeds, and landscape horticulture.
- Freshwater Conservation: By recycling wastewater, Dholera SIR reduces its demand on freshwater resources, such as the Narmada Canal network, by up to 50%.
2. STP and CETP Infrastructure Layout
The city’s wastewater recycling infrastructure is built with centralized and decentralized facilities to maximize treatment efficiency:
- Sewage Treatment Plants (STP): Dedicated to treating domestic and municipal wastewater. The STP in the TP1 Activation Area uses Cyclic Activated Sludge Technology (FAST) to treat municipal sewage to tertiary-level quality.
- Common Effluent Treatment Plants (CETP): Designed to treat high-pollution industrial wastewater from manufacturing plants, semiconductor fabs, and EV battery clusters before recycling it.
The table below lists the technical parameters of Dholera’s recycling infrastructure:
| Infrastructure Facility | Primary Input | Treatment Technology | Output Application |
|---|---|---|---|
| **Sewage Treatment Plant (STP)** | Municipal/Domestic sewage | Cyclic Activated Sludge & Ultra-filtration | Horticulture, landscaping, toilet flushing |
| **Common Effluent Treatment Plant (CETP)** | Industrial chemical runoff | Multi-Stage RO, Evaporation & Crystallization | Industrial cooling, boiler feed, cleaning |
| **Recycled Distribution Mains** | Treated recycled water | Ductile Iron (DI) pressure lines | Supply to manufacturing factories and parks |
3. Water Security for Semiconductor and Tech Clusters
For heavy water-consuming industries, such as the Tata Electronics 300mm Semiconductor Fab, water security is a critical operating factor: * Interrupted Recycled Supply: Industrial units receive a reliable, continuous flow of treated recycled water for cooling towers and washing lines. * Regulatory Compliance: Since DICDL provides centralized CETP and recycling, companies do not need to invest capital building their own ZLD systems, significantly lowering upfront industrial setup costs. * Eco-Friendly Operations: Operating inside a ZLD city allows manufacturing corporations to comply with international environmental standards.
Frequently Asked Questions (FAQ)
#### What is Zero Liquid Discharge (ZLD) in Dholera?
Zero Liquid Discharge is a mandate in Dholera SIR ensuring that all industrial and municipal wastewater is treated, recycled, and reused. No liquid effluent is discharged into rivers or the Gulf of Khambhat.
#### Where is recycled water used in Dholera?
Treated recycled water is distributed through separate utility pipes to be used for industrial cooling towers, boiler processing, cleaning, and municipal landscaping and parks.
#### How is sewage treated in the Activation Area?
Municipal sewage in the TP1 Activation Area is treated at a dedicated Sewage Treatment Plant (STP) using advanced Cyclic Activated Sludge and ultra-filtration technology to meet tertiary discharge standards.
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