Category: Planning & Management

393232 - Centralization vs. Decentralization of Wastewater Treatment – Technical Discussion

Tuesday, Jun 5
8:30 AM – 5:30 PM

The City of Los Angeles is home to the largest centralized water reclamation/treatment system in the west coast consisting of 6,700 miles of pipelines and four treatment plants. Currently, the City operates at approximately 60% of the treatment plants capacity. With water conservation policies, municipalities all over California are dealing with the effects of low-flows in sewer pipes such as odor, grease accumulation, and conveyance material degradation. With new wastewater treatment technologies on the market, a push to implement local treatment sites has generated interest. However, this brings up additional challenges in operation and maintenance responsibilities, water quality monitoring, and solids disposal, which would add additional strain to the centralized system. The City’s ambitious water recycling goals may not be met with this mining of used water and add more total dissolved solids (TDS) at the plant in the receiving effluent. This past year, the City of Los Angeles participated in the WaterBuild Local Issue Charrette, hosted by the U.S. Green Build Council. Industry experts at WaterBuild brainstormed ways to reduce water consumption in the County and City of Los Angeles and considered options such as water efficiency measures, on-site water sources, and recycled water systems, as well as provided a chance to illuminate challenges in our current water infrastructure, the effects on our purification system, and new approaches toward becoming more water resilient. Common themes that arose from this discussion are further summarized in this report.

Michael Simpson

City of Los Angeles / LA Sanitation
Los Angeles, California

Michael Simspon

City of Los Angeles / LA Sanitation

Mark Hsu

Environmental Engineering Associate
City of Los Angeles / LA Sanitation