WENT Landfill, Hong Kong — OTAR Case Study
| Location | Hong Kong |
| Client | SITA / Veolia Environmental Services |
| Technology | Variant 1 — Waste Heat with Thermal Destruction |
The Challenge
WENT is one of Hong Kong’s largest landfill sites, generating high-strength leachate with ammonia concentrations reaching up to 6,700 mg/L NH4-N. The site required a robust, long-term ammonia treatment solution capable of handling extreme and variable loads without relying on biological treatment alone, which is easily inhibited at this concentration.
The Solution
Organics Group delivered a custom-engineered OTAR® system using Variant 1 — waste heat with thermal destruction — powered by landfill gas already generated on site. The installation has been progressively expanded across five stages since its original 1998 commissioning, scaling alongside the growing landfill rather than requiring replacement.
Technical specifications
| Leachate flow | 3,250 - 4,800 m3/day (expanded over multiple stages, 1998-2024) |
| Influent ammonia | 4,500 - 6,700 mg/L NH4-N |
| Effluent ammonia | Less than 100 mg/L |
| Fuel source | Landfill gas — approx. 5,000 Nm3/hr |
| Track record | Commissioned 1998; expanded 2013, 2014, 2016, 2019 and 2024 |
Want to know how OTAR® works?
See the full technology explainer, five-variant breakdown, and cost comparison on the OTAR® technology page.
Why this project matters
- 26+ years of continuous operational integrity across five expansion stages
- Proven at extreme scale — one of the highest-strength leachate streams in the OTAR® portfolio
- Demonstrates OTAR®’s ability to scale alongside a growing site rather than requiring replacement
- Uses existing landfill gas as the energy source, avoiding new fuel costs
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