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RWQCP Plant Expansion

The RWQCP is currently undergoing a plant-wide expansion that will increase the treatment capacity of the plant from 40 million gallons per day (MGD) to 46 MGD. The plant expansion will see the incorporation of various new technologies designed to produce high-quality effluent water that can be reused throughout the region. Construction at the plant commenced in October 2012 and is expected to conclude at the end of 2015. Unfortunately, during construction the R.V. Dump Station will be closed and plant tours for children will be unavailable.

Among the new technologies included in the Plant Expansion are:

MBR Technology

Among the highlights of the plant expansion is the incorporation of Membrane Bioreactor (MBR) technology. MBR will provide reliable and high quality reusable water while minimizing the modifications needed to existing infrastructure. MBR technology

The expanded plant will utilize a "LEAPmbr" system which offers multiple advantages over previous MBR technologies. In particular the RWQCP will benefit from the system’s air scour aeration system. LEAPmbr also increases plant productivity, reduces the energy cost associated with air scouring, and works on a smaller footprint to help conserve space and save on construction costs.

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Linear Motion Mixers

linear motion mixersAs part of the treatment process, the RWQCP operates several digesters which produce biogas from which energy is produced to operate the plant. As part of the plant expansion, new and existing digesters will be equipped with linear motion mixers.

Unlike other mixer systems these mixers produce uniform mixing due to the combined effect of oscillating velocity coupled with pressure waves. This motion is created by the controlled up and down movement of a specially shaped Hydro-Disk.

Linear Motion Mixers are easy to install, use less energy than other systems, minimize grit deposition, and significantly reduce maintenance costs.

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FOG Receiving Station

fog receiving stationOn April 27, 2005, the City began the Grease to Gas to Power project. Local grease haulers who pick up Fats, Oils, and Grease (FOG) were able to take FOG to the RWQCP for processing and injection into anaerobic digesters. By adding this grease wastewater to the anaerobic digestion process, the RWQCP was able to increase gas production and methane gas concentration.

The plant expansion includes expanding and improving this project through the construction of the new FOG Receiving Station. The new station can process up to 60,000 gallons of grease wastewater each day. This new receiving station will enhance biogas production in anaerobic digesters. Biogas is then converted to electricity using a Cogeneration System.

By offering local grease haulers a safe way to dispose of restaurant grease, this component of the plant expansion will have a significant positive impact on the environment and provide a beneficial use for wasted grease from local restaurants and food processing facilities.

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OpenCEL Process

One byproduct of the wastewater treatment process is Waste Activated Sludge (WAS). This sludge is put into digesters where it is anaerobically digested to produce biogas. The digestion process, however, only serves to treat about one third of WAS because of its cellular makeup. Its cell walls protect the cell contents so well, most of the cellular material is unavailable to the anaerobic microbes in the digester and passes through the process.

openCEL process

The RWQCP Plant Expansion will incorporate OpenCEL technology which utilizes an electrical field to split WAS microorganism cell walls, releasing contents which are more easily converted to biogas, increasing biogas for energy production.

The OpenCEL process increases digester performance and biogas production. It also provides for a reduction in biosolids mass once sludge leaves the digester. The reduced biosolids mass reduces the costs associated with dewatering and biosolids transport.

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Quick Links
Sewer Rates & Fees
2019 Sewer Master Plan
Other Wastewater Resources
General Information
Riverside Water Quality Control Plant (RWQCP)
5950 Acorn Street
Riverside, CA 92504

Phone: (951) 826-5311
The 311 Call Center is open during normal business hours to assist you.

After Hours Phone: (951) 351-6140
In case of an emergency or sanitary sewer overflow, please contact the RWQCP after hours number for immediate assistance.

Admin Hours:
Hours: M-F 7:30 am-4:30 pm  
Closed on Weekends and Major Holidays
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