Discusses a decision model to determine the best treatment process for the City of Oxnard, CA's groundwater recharge process utilizing secondary effluent....

Rejection capabilities of Reverse Osmosis (RO) membranes to Total Dissolved Solids (TDS), physical and aggregate and conventional contaminants (i.e., total nitrogen, total organic carbon) have been well demonstrated through pilot and full-scale RO operations. The information regarding rejection capabilities of RO to non-regulated compounds such as ...

The City of Santa Maria, CA needed to increase it's water production from groundwater wells in order to meet the city's demand. However, increasing TDS concentrations have forced the city to use RO or EDR in the treatment train. Both of these options have a brine byproduct that the city wants to minimize. The city compared 10 brine minimization and...

The paper describes desktop evaluations coupled with bench-scale testing to select the right approach for water stabliziation in a post treatment mode based on empirical data rather than assumptions. The study findings are useful for agencies who are looking for Reverse osmosis permeate post-stabilization approaches that produce a low particulate t...

This paper will summarize application area(s), where and when the technologies have been tested or implemented (if applicable), testing results, state of development, and implementability potential of the technologies in next 5 years. The information presented in this paper will provide a great value for agencies, researchers and consultants who ar...

The information presented in this paper provides a great value for agencies and consultants who are considering use of seawater desalination as a means to supplement current water supplies and plan to introduce desalinated seawater into their existing distribution system. Testing methodology and outcomes of the study are provided....

Many water utilities ask why stringent UV disinfection requirements are in place since reclaimed water pathogen limits are mainly met through MBR alone. The energy use and associated cost for UV disinfection may be an impetus for some facilities to contemplate turning their UV reactors down to a lower operating dose setting without compromising reg...

Membrane bioreactors (MBRs) combine secondary treatment and solids separation in one system that produces high quality effluent with virtually free of solids. Coupled with widely used biological nutrient removal (BNR) technology, MBR can meet stringent effluent total nitrogen (TN) and total phosphorus (TP) limits, especially where site space limita...

The paper portion of this file discusses a pilot ceramic membrane at El Toro CA Water Recycling Plant. The PowerPoint portion of this file discusses the virus removal capability of a polymer based MBR water reclamaion system at City of Henderson NV which uses a municipal wasterwater source....

This paper provides a historical perspective on how the groundwater recharge regulations have evolved and type of projects implemented over the time in California and highlight current status of Indirect Potable Reuses via surface water augmentation and direct potable reuse regulations....

This paper describes a detailed assesment and comparison of a 2 MGD pressurized microfiltration facility that treats secondary effluent from a non-nitrifying facility with or without ozone treatment. The results should aid designers of similar facilities as to use or not use ozone as a pretreatment....

Indirect potable reuse (IPR) projects via groundwater injections in California utilizing full advanced treatment require MF/UF, RO and UV advanced oxidation to meet pathogen, TOC, trace organic and other requirements specified in the most recent groundwater recharge regulations (California Department of Public Health, 2014). The main functions of M...

This paper summarizes cost effective and proven approaches/methods to get similar pathogen credits when MBR replaces MF/UF in potable reuse trains. The findings of this paper are highly valuable for agencies, regulatory agencies, consultants and individuals who are involving in potable reuse projects and or helping developing a frame work for fort...

Reducing RO concentrate flows generated from RO based advanced treatment facilities has become a major interest of agencies located in inland areas where surface discharges may not be possible. To meet this objective, many agencies are considering incorporating a high recovery RO concept into the AWTF design. However, depending upon nature of secon...

Full advanced treatment (FAT) consisting of reverse osmosis (RO) and advanced oxidation process (AOP) has been widely used in indirect potable reuse (IPR) applications in California and some other states and is expected to be a major component of the direct potable reuse (DPR) trains in future. FAT has been proven very effective in reliably meeting...

Full advanced treatment (FAT) consisting of reverse osmosis (RO) and advanced oxidation process (AOP) has been widely used in indirect potable reuse (IPR) applications in California and some other states and is expected to be a major component of the direct potable reuse (DPR) trains in future. FAT has been proven very effective in reliably meeting...

In many potable reuse projects, we largely rely on traditional control logics along with the conservative set points to take a unit process or entire treatment train offline to prevent the public consumption of unsafe water. While it represents a safe solution, it does not necessarily reflect the best management strategy due to potential losses of ...

In many potable reuse projects, we largely rely on traditional control logics along with the conservative set points to take a unit process or entire treatment train offline to prevent the public consumption of unsafe water. While it represents a safe solution, it does not necessarily reflect the best management strategy due to potential losses of ...

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Solutions Volume 41 Issue 1 2022...

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