Lions Gate (West Vancouver)

The Lions Gate wastewater treatment plant treated 32 billion litres of wastewater in 2012. Located in West Vancouver at 101 Bridge Road, the plant provides primary treatment to wastewater from about 180,000 residents in the District of West Vancouver, the City of North Vancouver, and the District of North Vancouver. Once treated, wastewater is discharged into the Burrard Inlet.

The existing Lions Gate Wastewater Treatment Plant opened in 1961. While its capacity has been expanded several times since it opened, the plant is one of two primary treatment plants remaining in the region. New federal and provincial standards require all primary treatment plants be upgraded to secondary treatment. To meet these requirements, Metro Vancouver will build a new secondary treatment plant, at a site approximately two kilometres east of the existing treatment plant.




Treatment standards

The wastewater treatment plant is regulated through an Operational Certificate issued by the BC Ministry of Environment. The treated wastewater that is discharged from the plant is required to meet standards for biochemical oxygen demand and total suspended solids. Discharged wastewater from the plant must not exceed 130 mg/L for both biochemical oxygen demand and total suspended solids. The plant’s daily average was 90 mg/L for biochemical oxygen demand and 54 mg/L for total suspended solids in 2012.

Recovering resources from wastewater

The treatment plant uses anaerobic digestion to break down organic materials from wastewater to produce biosolids and methane gas. The methane is used to generate heat for use in the plant’s operations and to power gas-driven engines that pump the wastewater into the plant. The plant produces about 3,300 bulk tonnes of biosolids every year.