Water / Wastewater
Electrode Market Size Increases..
The need for pH electrode for particular applications is growing, as many users of pH Meters find the standard combination electrode supplied with their meter is not suitable for a particular application. SENTEK has successfully grown their business because not only do they offer a standard range of probes for various applications, but are prepared to make probes to suit a customers needs. A good example of a probe which is successfully used for the measurement of beer, blood products, cosmetics, dairy products, paint, and micro samples is the P13. This has a 90 x 4.5mm dia stem, and is also available for NMR use in a 180 x 4mm stem. It has a range of 0-14 pH, with a temperature range of 0-80ºC. It has a ceramic frit junction.
Reader Reply Card no 85
Emerson Wins Main Instrument Vendor Contract to Automate Nalco’s New Water Treatment Chemicals Plant in China
Emerson Process Management has been selected by Nalco Industrial Services (Nanjing) Co. Ltd, as the Main Instrument Vendor for a new water treatment chemicals plant in the Nanjing Chemical & Industrial Park in China. The plant, scheduled for completion early in 2009, is being constructed by the Nalco Company of the United States, the world’s largest producer, supplier, and facilitator of water treatment chemicals. Nalco is investing about $25 million US in the new plant in Nanjing City. It will have a total annual capacity of 37,000 tons. “The factory in Nanjing will become our largest and most important production base in China,” commented Mr. Louis L. Loosbrock, Group Vice President of Nalco. “Products made there will be capable of implementing the most advanced water treatment strategies.”
Plant designers chose to implement Emerson’s PlantWeb®
digital plant archi-
tecture with batch processes controlled by the DeltaV™ digital automation system and using FOUNDATION™ fieldbus technology. Emerson is also providing on- site engineering assistance during the implementation and start-up phases. Instrumentation in the new plant includes Rosemount®
pressure transmitters, Micro Motion® flowmeters, and FIELDVUE®
controllers mounted on Fisher® valves. AMS®
temperature and mass
digital valve control
Suite: Intelligent Device
Manager software will be employed for instrument commissioning, predictive maintenance, and asset optimisation. “Our DeltaV automation system is the right choice for batch processes, and the FOUNDATION fieldbus communications technology contributes significantly to lower construction costs by reducing the cost of instrument installation and loop checkout,” said Mike Train, president of Emerson Process Management Asia Pacific. “After several Nalco Nanjing representatives visited our facility in Shanghai and witnessed development of a batch project, we were delighted to be chosen to implement these technologies in their new plant.”
Reader Reply Card no 141 Reader Reply Card no 87 AET October/November 2008
25 Autoflush System Helps Solve Sensor Fouling Problems in the Paper Industry
Process Instruments (UK) has flushed away the problems of sensor fouling in the paper industry with a new autoflush system. Paper mills face the problem of online instruments being plagued with fouling problems. This means having to deal with a build up of fibres, particles and chemical deposits on instrument sensors. To ensure smooth running of mill processes all this build up must be removed, which wastes considerable time and resources on cleaning and maintenance. Process Instruments has introduced an autoflush system to help sensors to stay clean without user interference. By flushing the sensor with fresh water at user defined intervals, the need for cleaning is greatly reduced and therefore overall productivity in the mill is increased. Dr Craig Stracey of Process Instruments said: “We were constantly getting customers from paper mills telling us of the problems of sensor fouling and what a drain this was on their resources. “With our extensive experience within the industry and working closely with customers we were able to develop an autoflush system to provide a solution to these problems and enhance our existing instrumentation within the paper industry. The autoflush system continues to provide a good service to the mills we have already installed the system in and we expect it to attract new customers with similar problems.” The autoflush is suitable for use with any Process Instruments’ pH, ORP, Chlorine, Ozone or Chlorine Dioxide sensors and can be customised to deal with specific problems that any mill may be experiencing. The innovative and flexible CRIUS electronics are featured within the system, which means if the autoflush needs maintaining or calibrating it can send an alarm text message or allow remote access via the internet and its GSM/GPRS modem.
Reader Reply Card no 86
Revolutionary Range of PeCOD™ COD Analysers Launched
Aqua Diagnostic (Australia) have invented a revolutionary green technology COD (Chemical Oxygen Demand) analyser capable of real-time accurate and sensitive (sub-ppm) COD analysis. The PeCOD™ technology represents a major step forward in COD analysis, on multiple levels. GREEN; no hazardous or toxic chemicals are required, only an electrolyte solution, unlike the standard dichromate method. FAST; analysis times can be determined in minutes not hours, thus providing the economic benefit of real-time process control and environmental monitoring. VERSATILE; a broad spectrum of matrix streams including seawater can be easily analysed. SENSITIVE analysis to sub- ppm levels. ACCURATE analysis of a wide range of organic species including many traditionally ‘recalcitrant’ species such as primary alcohols and carboxy acids which are frequently underestimated by traditional COD analysis techniques. BOD can be directly correlated to the PeCOD™ COD results.
PeCOD™ COD analysers are available in three different models purpose designed for Laboratory use, Field Portable analysis, and Online COD monitoring. All systems incorporate the same core COD analysis module to ensure identical performance between models. The simplicity and speed of the technique is what allows it to be fully automated in a self-contained online system. The system comes pre-configured in a single weatherproof stainless steel enclosure that houses the sampling, analysis, and telemetry modules, as well as electrolyte solution reservoirs. It can be configured to monitor multiple sample streams. This has significant benefits to any industry involved in WASTEWATER TREATMENT, or using COOLANT WATER or WATER FEEDSTOCK to a manufacturing process. In wastewater treatment plants the secondary influent can be monitored in real-time, providing the plant with early warning of any changes in COD, and through PLC control increase aeration to deal with this. This saves on energy (most plants run at higher aeration levels than they need ‘just in case’) and avoids costly process excursions. In BNR plants (biological nutrient removal) methanol or acetic acid is used as a food source for the biological process. Measuring the COD of the influent allows more accurate dosing of the food source, increases the efficiency of the process and reduces expensive over-dosing. Because the PeCOD™ technique is both fast and accurate, it can be used to do an immediate COD measurement on waste that is brought in by road tankers. This ensures that the client is being charged appropriately, as well as avoiding treatment plant issues from unexpected high COD loads. For industries using SEAWATER in cooling towers, the PeCOD™ technique is the first to be able to directly and accurately monitor the coolant stream despite the high chloride concentration up to 35,000 mg/L. Outflow can be monitored to ensure compliance with environmental requirements, and also warn of product loss into the coolant stream (e.g. sugar refineries). The PeCOD™ technology is based on a patented photoelectrochemical process. The core of the technology is the ability of the UV activated TiO2
(titanium dioxide)
nano-particulate photocatalyst to create a high oxidation potential. This ensures complete oxidation of all oxidisable organic species. The direct capture and measurement of the resultant photocurrent means that a direct measurement of the oxidation is being made.
Reader Reply Card no 88
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