Presentations by Tom Knoell
Matches: 8
Groundwater Replenishment System: Operation from Pilot, Demonstration, and Full-Scale Systems
The Orange County Sanitation District operates a 70 mgd water reuse facility. The treatment train includes MF/RO/UV/Lime. Pilot testing was conducted to evaluate different MF and RO membranes for fouling potential. Lessons learned from the extensive 3 year pilot testing has contributed to the success of the full scale operation....
Time to Replace Your RO Membranes - Lessons From Two Premier California Water Recyclers
Membrane Replacement for Water Reuse Plants...
From Qualification to Selection: Orange County?s Groundwater Replenishment System RO Membrane Procurement Process
This paper reviews the procurement process employed by OCWD to evaluate, qualify and select RO membranes for the GWRS. Given the dynamic regulatory environment and advances in membrane technology, the program has adapted to ensure that membranes are appropriately evaluated and selected. The evolution of this program, as well as performance data fro...
Advancing Reverse Osmosis Membrane Performance in a Water Reuse Application - A Collaborative Approach
In an advanced water reuse application, reverse osmosis (RO) technology serves a critical role. This paper reviews the benefits of operating high performance RO membranes, and the obstacles associated with delivering those benefits through the operation of the Orange County Water District?s (OCWD) Groundwater Replenishment System (GWRS). Perform...
One Down, Fourteen To Go. Replacing Membranes In A 5mgd RO Unit In Orange County?s Groundwater Replenishment System
This paper documents the process employed by the Orange County Water District (OCWD) to replace membranes in a 5 MGD reverse osmosis (RO) unit. From membrane extraction to installation, each step posed a series of unique challenges - some of which were unknown to staff prior to initiating the project. Upon start-up, performance was monitored clos...
Optimizing Reverse Osmosis Pretreatment Chemicals in Orange County?s Groundwater Replenishment System
Report on optimizing RO pretreatment chemicals at Orange County Water District's (OCWD) 100 mgd Ground Water Replenishment System (GWRS); an advanced wastewater purification facility in Southern California. The source water to this facility is secondary municipal wastewater from the Orange County Sanitation District. The GWRS consist of major treat...
Capitalizing on the Latest Advancements in Reverse Osmosis Membrane Technology
Prolonged drought across the Southwest United States has caused water utilities to consider alternative supplies. Critical to developing these supplies is an increased reliance on proven technologies such as reverse osmosis (RO). Critical to this technology is the membrane element. While the industry is mature, advances in membrane design and co...
Case Study: Mitigating Severe Organic Fouling in a Brackish Groundwater Reverse Osmosis System
The Torrance Desalter could not be commissioned after a two year expansion because of increases in interstage feed pressure to the 2nd stage. The initial assumption was that scaling was occurring. However, an autopsy and cleaning study determined that the foulant was entirely organic in nature. The approach was to mitigate the problem by resolving ...