Aeration System Also Provides Biological Nutrient Removal: Population Growth was straining the resources of the West Richland County Public Service District (Columbia, SC).  Its Gill's Creek Wastewater Treatment Plant now had processing problems and wanted to increase capacity from 30,000 to 60,000 m3/d (8 to 16 mgd), but had little room to grow onsite.

Aeration System Helps NYC's Largest WWTP Meet EPA Mandate: In 2003, work began to upgrade the 310 mgd Newton Creek facility.  As part of the more than $3 billion secondary treatment upgrade, the plant added systems to reduce TKN and other biological pollutants and to generally improve municipal water quality.

Biological Wastewater Treatment: The use of Microorganisms to remove contaminants from wastewater is effective and widespread.  To choose the right system from the many options offered, understand the various techniques available and evaluate them based on your requirements.

Enhanced Nutrient Removal Using a Continuous Backwash Filter for Secondary Effluent Denitrification: As effluent discharge permit limits become more stringent, utilities are constantly searching for efficient and costeffective methods to meet these tighter restrictions.

Hybrid Aeration Process Provides Power Savings: In most wastewater treatment plants, aerating activated sludge systems consumes the majority of the plant's power.  Thus, the efficiency of the aeration system becomes a major factor in designing an economically operated plant.

Microfiltration Performance Enhancement Using an Air-Scour, Air-Assisted Liquid Backwash Regime: This paper presents recent advancements in the MEMCOR® membrane filtration process. The new CMF-L process incorporates an improved membrane technology with a low-pressure liquid backwash regime that uses less energy and increases water recovery.

Optimizing Existing Water Treatment Systems: Keeping aging water treatment systems running efficiently presents unique challenges to users.  How do you extend the life of these essential system components?

SBR Plants Provide Wastewater Treatment Solution for Housing Developers: Developers seeking to build new homes in housing developments are sometimes required to install a wastewater treatment system in order to obtain construction permits, depending on the regulations in their particular state.

Water Assessments: The Search for Hidden Dividends: A close look at all aspects of your water- and wastewater- treatment systems can reveal opportunities for cost savings, improved operation, reduced downtime and better water conservation.

A Package Plant Approach to Decentralized Wastewater Treatment: Decentralized wastewater treatment has been utilized for many years, with a number of different treatment technologies, most notably septic systems.  In cases where septic treatment is not adequate to meet the treatment objectives, engineers will often incorporate secondary and tertiary treatment into the process design.

A Peruvian Project: Refinery Spent Caustic Wet Air Oxidation: The Repsol YPF refinery in La Pampilla is the largest in Peru.  The hydrocarbon streams contain sulfides and organic acids which are undesirable contaminants, and are removed by caustic treatment.  Several different caustic treatment steps are performed through the refinery, making numerous spent caustic waste streams.  The spent caustic streams are malodorous and toxic, and are difficult to treat by conventional biological means.

Achieving Big Returns by Automating Rural Water Systems: There are several ways a community can bring reliable, cost-effective automation to its system. Regardless of the system selected, it is important to seek a company / automation partner that has expertise and significant experience in providing automation of water systems.

Municipal Tertiary Treatment: Disc Filters Enhanced by Pleated Configuration: With disc filters, the difference in woven filtration media and flow pattern makes each technology unique to a particular application. Both inside-out and outside in configurations perform to expectations, considering that these devices have been marketed for municipal tertiary applications, but the inside-out technique provides better sustainability and life cycle cost.

Wastewater Treatment: Wet Oxidation/PAC Solution to Treat Repsol Quimica’s Varied Wastewater Streams: Repsol Quimica, S.A., located in Tarragona, Spain, built an industrial wastewater treatment facility (WWTF) to support the company’s 678 000 tpy propylene oxide/styrene monomer (PO/SM) and derivatives chemical production plants.  When designing the facility, Repsol considered several factors, including stringent environmental regulations and effluent discharge standards.  After evaluating several technologies, Repsol decided to treat its high strength wastewater with a combination of wet oxidation and non-conventional biological treatment. 

Sicure BWMS Based on Filtration, Disinfection and Control: The Sicure Ballast Water Management System (BWMS) uses electrolysis to produce sodium hypochlorite right from the seawater it is treating. The system uses the same principles and core components as the Chloropac® system that prevents biofouling in cooling water circuits on board oil platforms and ships around the world.  The Sicure BWMS is based on three main process steps, including an electrolytic process.  This is one of the main differences between BWMS and other available systems, in which all the main components are integrated directly into the ballast water pipework.

Sludging It Out: Improving Circular Clarifier Efficiency: Many innovations and refinements to the design of clarifiers have been made over the years to increase flow capacities and improve efficiency in the settling and collection of settled solids. When conducting evaluations of existing systems, it’s helpful to know what new options exist to decide if it’s time for a change.  Circular clarifiers fulfill a variety of functions in the scheme of a treatment plant, including grit collection, primary collection, secondary fixed-film or activated sludge collection, thickeners, and more.

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