HSBC's critical data centre sits next to the Tsuen Kwan O landfill — and every time it rained, the smell got worse. Landfill gases poured in through the HVAC intake and had nowhere to escape thanks to the building's sealed, fixed-window design. Staff endured the odour daily. Previous attempts with activated-carbon filters worked briefly, then lost effectiveness as the media saturated. The bank needed a permanent solution, not another temporary fix.
RHT engineered a custom NCCO Air Treatment Unit rated for over 10,000 L/s of airflow and installed it at the building's fresh-air intake. Instead of trapping pollutants like carbon does — until the filter fills up and stops working — the NCCO reactor breaks landfill gases down into harmless water vapour and CO₂. The result: over 80% VOC removal, over 92% ammonia reduction, and zero staff complaints. No filter replacements. No recurring costs.