Water. desalination + reuse

November/December 2012

Water. Desalination + reuse

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SHOWCASE pipE-clamp SEnSOR mEaSuRES pROcESS tEmpERatuRE EaSily The Rosemount�� 0085 nonintrusive Pipe Clamp Sensor was announced by Emerson Process Management on 25 October 2012, providing a simple, fast solution for adding reliable temperature measurements and increased process visibility. The sensor enables the addition of temperature measurements and increased process visibility in areas where intrusive sensors are not possible due to excessive stress placed on sensors with thermowells. �� The Rosemount 0085 nonThe Rosemount 0085 is intrusive Pipe Clamp Sensor optimised for ideal sensorpipe contact and heat transfer, with a spring-loaded sensor and a highly conductive flat nickel or silver sensor tip. Its robust design was built to hold a transmitter in its assembly, and when paired with the Rosemount 648 wireless transmitter, the sensor gives operators immediate access to reliable temperature measurements, with no process intrusion. With the sensor, process manufacturers will have enhanced visibility across their operation, and be better positioned to resolve issues proactively, improve operations, and meet quality and production targets while lowering costs. The sensor is easy to configure and maintain, and its simple two-bolt design makes it easy to install. | 38 | Desalination & Water Reuse | November-December 2012 WatER pROfilER Will cOmplEtE 18 tEStS in 5 minutES A potable water profiling system that simultaneously tests for up to 18 disinfectant and infrastructure-critical analytes and parameters will be launched next year by e-SENS Corporation, based in Salt Lake City, Utah. The company announced on 19 September 2012 that initial investments had been secured and a new laboratory and office are now open and operating. The profiling system, using electrochemical sensors based on patented and microfabricated semiconductor ���lab-on-a-chip��� technology, can complete up to 18 tests in under five minutes. The patents for the sensor technology are licensed to e-SENS from the University of Michigan for exclusive worldwide use. Technology development by the founders has been ongoing for over 30 years, and initial hires have been made while the company actively seeks additional investors and staff members. ���Our silicon-based system leverages over three decades of research and will be a major advance in giving users a complete, comprehensive and nearly instant picture of the quality of the water we depend on and take for granted,��� said Michael McCorquodale, president, chief operating officer and co-founder of e-SENS. ���This change mirrors the many ways that silicon technology is transforming the world now, from communications and photography, to music and reading.��� Optical dO SEnSOR addEd tO Gf pipinG RanGE An optical sensor to measure dissolved oxygen (DO) with high reliability and reduced maintenance and energy costs has been added to instrumentation available from GF Piping Systems. Traditionally, dissolved oxygen has been measured utilizing galvanic or polarimetric measurement technologies that require membranes and reference solutions. GF Piping���s optical DO technology eliminates the need for replacement of membrane and reference solutions associated with these types of technologies, thereby reducing maintenance costs. The new Signet 2610 Optical DO Sensor incorporates an optical sensor cap that is factory calibrated and requires no field calibration. The cap features a one-year lifetime compared with membrane life, which is typically 3-6 months. Long service-life is further enhanced through the optical technology���s resistance to abrasion and bleaching. The 2610 was designed primarily for wastewater treatment applications. Since wastewater aeration is the largest component of energy consumption in a wastewater treatment system, solutions to improve on this are in demand. By using the new sensor to monitor the DO levels in a wastewater system, operators can reduce the energy demand required for the system. Key features to the new sensor include rugged materials of construction that can withstand the harsh environments of both fresh and saltwater applications. Built-in Modbus RS485 and 4 to 20 mA current loop outputs provide ease of interface to existing control systems. Combining the sensor with the new 9900 transmitter provides a cost-effective DO monitoring system. Operating capabilities include a measurement range of 0 to 20 mg/L, 0 to 200% saturation, and accuracies of: �� 0.1 mg/L for 0 to 8 mg/L and ��0.2 mg/L for 8 to 20 mg/L. The new sensor is CE and FCC approved and available with two weeks lead-time. Alamogordo test brings solar-still record _________ Hills Kemp, CEO and founder, KII Inc (Suns River), USA ___ RESEARCH SWRO pump/ER SyStEm tO bE launchEd by KSb A new compact pump/energy-recovery device for seawater reverse-osmosis (RO) desalination is to be introduced early in 2013 by KSB AG of Germany. The Salino Pressure Center consists of an axial-piston pump and an axial-piston motor, arranged on a common shaft. Driven by the diaphragm return flow, the axial piston motor transfers its power directly to the pump shaft. Compared with conventional energy-recovery systems with pressure-exchangers or Pelton turbines, KSB says that this design saves up to 50% in energy costs. The Salino Pressure Center is designed for RO systems with a capacity of up to 480 m3/d. The electric drive has a rating of 29 kW. All components are resistant to seawater and dimensioned with low life-cycle costs in mind. An integrated control system can respond to fluctuating salt content in the seawater to be processed. Field tests have been underway at various Middle Eastern sites since October 2012. In recent tests, the new compact unit desalinated 1 m3 of seawater with a salt content of 35,000 ppm at a power input of approximately 2 kWh. As no piping is required between the individual components, the new system takes up minimal space, which makes it ideal for use in mobile container units. KSB claims to be the first manufacturer to supply this type of compact system for the RO process. Editor���s Note: At the end of September 2012, desalination.biz reported that KII Inc and its Suns River brand had successfully started-up and operated its patented solar-still technology to produce safe water for human uses. Suns River demonstrated its technology at the Brackish Groundwater National Desalination Research Facility in Alamogordo, New Mexico, owned and operated by the US Bureau of Reclamation. The still���s creator fills in the background. PEOPLE HAVE TRIED for thousands of years to use the power of the sun to extract fresh water from seawater and other salty streams. Aristotle confirmed that the classic solar still would produce distilled water but did a very poor job. That was 350 BCE. The commercial-sized unit installed in Salinas, Chile in 1870 operated for over 30 years but was shut down due to poor productivity. Thus the fate of the solar still as a viable, commercial option was sealed. That was until KII Inc and its Suns River brand reinvented that classic device. In August 2012, Suns River started up its new solar still at the Brackish Groundwater National Desalination Research Facility (BGNDRF) in Alamogordo, New Mexico, USA. The US Bureau of Reclamation site supports research and technology aimed at producing fresh water from the saline groundwater plentiful in the New Mexico desert. Suns River built several units according to its patented technology (USPTO # 8,088,257) and conducted multiple runs. After discovering and designing around the effects of aerosol gypsum off the White Sands National Monument, the Suns River A Simple Process Inland Version Process flow diagram for the inland set-up. still produced distilled water at a rate of 12 L/m2 /day ��� which is a world record for productivity for the solar still. While this rate of production is unprecedented, we are continuing to optimize operation and expect to achieve production in the 14 ��� 16 liters/m2 /day range. Key process cHanges The classic solar still is basically a greenhouse over a pool of salt water. Suns River makes several key process changes. Instead of a stagnant pool of salt water Suns River employs a falling thin film of salt water on a black surface to enhance evaporation. The classic still depends on the outside air to condense interior humidity on the underside of the transparent roof. The Suns River design puts cooling tubing inside the still and uses cold water as the heat sink. This heated water is then used to produce additional distillate yielding the patented Suns River multi-effect solar distillation. More information about Suns River is available on its website and blog, www.suns-river.com. energy use Solar energy is delivered to the earth surface evenly across any given area. The August 2012 delivery to Alamogordo measured just under 6 kWh/m2 /d. One of the Suns River test stills had a footprint of 1.4m2. That put just over 8 kWh of energy available for the Suns River day cycle. With the direct daytime production, plus the second effect recovery, total production was 16.4 L. Production of 16.4 L on 1.4 m2 yields just under 12 L/m2 /d and is a world record. In fact, without major enhancements, the classic solar still produces only about 3 L/m2 /d ��� one fourth the Suns River rate. Production from the classic solar still is equivalent to only about 30% of the incoming solar energy, but the Suns River productivity is over 90% due in part to the multi-effect design. The product of the solar still is completely pure water and blending with 3,000 TDS feed water the potable ��� November-December 2012 | Desalination & Water Reuse | 39 |

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