8 Gas Detection Sludge AD biogas Analysis in Turkey
At the $150m Antalya wastewater treatment plant, one of the biggest in Turkey, the operator knew what they wanted for anaerobic digestion (AD) biogas analysis. They specified a low maintenance AD biogas monitoring system, with completely automatic operation and remote online support from the manufacturer. In addition they wanted local sales support and service which is provided by the Geotech distributor in Turkey, RAM who supplied a Geotech (UK) AEMS static gas analyser.
At the plant every day over 3,000,000 cubic meters of waste water are treated through 28 units of biological waste water treatment plants, two advanced biological waste water treatment plants, nine waste-water preliminary facilities and 68 pumping stations. The operator is the Kuzu Group and General Directorate of Antalya Water and Wastewater Administration. The Kuzu Group operates all the wastewater treatment plants in Istanbul.
Before the biogas goes to a 2,569 kVA/h CHP engine it is analysed by the Geotech AEMS (Automated Extraction Monitoring System) unit. The biogas analysis data also indicates the stability of the anaerobic digestion process. The AEMS unit was installed and commissioned in a single
day by a Geotech service support engineer and since then has run automatically 24/7. A second AEMS unit will be commissioned next.
When the site is fully operational, daily totals of 80,000kg of water-treatment sludge will be processed by four anaerobic digesters, producing up to 26,400 cubic meters of biogas. Built on top of the four anaerobic digesters is a conference room with panoramic views across the Antalya site. The city of Antalya, with a population if one million, is located on the Turkish Mediterranean coast.
The Geotech AEMS static gas analyser has extensive application options with multiple sampling points, data inputs and 4- 20mA local data outputs, PROFIBUS and MODBUS comms options, Ethernet and Internet connectivity, data logging and data transfer.
Users of a Geotech AEMS unit have the option of using Geotech AEMS Data Centre software. With this the user retains their own set of data as the AEMS unit stores audit-trailed readings/data sets for well in excess of six months. The data can be viewed on-line with the password-protected Geotech AEMS Data Centre software globally from any PC and downloaded to spread sheets. Using the AEMS Data Centre, operators can remotely remove data from the on-site AEMS flash disk memory once received by the AEMS Data Centre so the in-field unit need never reach a data capacity limit.
For applications not requiring the extensive capability of Geotech AEMS, the user-installed Geotech GA3000 static gas analyser delivers exactly what many users need and at a very attractive package price. Newly announced for the GA3000 is MODBUS digital output allowing communication with SCADA systems. Simple and robust, MODBUS has become an industry standard, allowing communication between many devices. This means that biogas concentration data from the GA3000 can be readily integrated with flow, pressure, and other instrumentation.
Reader Reply Card No. 17
Safety Fast from New Carbon Monoxide Sensor
Gas sensing experts, City Technology (UK), have introduced the 4CM, a new carbon monoxide sensor designed for use in the world’s most challenging environments. Developed to meet the most stringent toxic gas and mining standards, the 4CM not only improves the functionality, reliability and effectiveness of PPE in hostile environments, but also demonstrates outstanding performance and stability in temperature and humidity extremes.
The 4CM outperforms other sensors on the market by responding 12% faster to CO hazards and recovering in over half the time of the industry average. This is a major benefit to detection instrument manufacturers keen to improve the performance of their products.
Carbon monoxide (CO) is extremely difficult for people to detect. Exposure to concentrations as low as 100 ppm can be dangerous, higher levels of exposure can be life threatening. In industry, the gas is routinely found in mining facilities, oil and gas plants, petrochemical facilities, steel plants and wastewater treatment plants. It is also major potential hazard when personnel are required to enter confined spaces and therefore effective CO detection is vital.
Rob White, Product Marketing Manager, City Technology, said: “As global leader in the design and manufacture of gas sensors for personal life safety equipment, the 4CM continues City’s tradition of developing products that make a positive contribution to the preservation of life in challenging environments. The 4CM is the fastest CO sensor on the market, the most efficient in terms of reducing calibration costs and complements our growing portfolio of high performance sensors that include the recently launched 4OXV. Manufacturing on fully automated lines in the UK provides full characterisation of every sensor, traceability down to the component level and guaranteed uncompromising quality.”
The 4CM offers electrical and mechanical backwards compatibility with previous generations of City CO sensors. It has a typical T90 time of seven seconds and a recovery time to an indicated level of less than 2ppm in less than 100 seconds. During 50-day exposures in 50°C and 11% relative humidity, and 50°C at 95% relative humidity, the 4CM operated to specification. The sensor provides excellent accuracy and stability at high and low gas concentrations, meeting the EN45544 requirements for uncertainty, typically achieving 1ppm for zero concentrations and less than 1% variation at 250, 750 and 1000ppm.
Reader Reply Card No. 18
Protect Yourself from Hazardous Gases!
Sensit’s (USA) P100 is a single gas personal monitor designed to warn the user of hazardous gases in their working environment.
This unit is easy to use and offers low maintenance and lost costs in one package! The P100 is operated with a single button and offers simple field calibration. Users are alerted of a hazardous gas by audible, visual and vibration alarms. The detector also includes an alarm event memory and comes with a limited 2 year warranty, although extended warranties are available.
The Sensit P100 is ideal for users in oil and gas exploration, gas contractors, emergency response and emergency medical personnel. These detectors are widely used by fire departments, industrial plants, utility contractors, safety inspectors, water/sewer departments, maintenance, home inspectors and heating contractors. Sensors are available for hydrogen
sulphide (H2S), hydrogen cyanide (HCN), oxygen (O2), carbon monoxide (CO). chlorine (Cl2), nitrous oxide (NO), nitrogen dioxide (NO2) and sulphur dioxide (SO2)
Reader Reply Card No. 19 Reader Reply Card No. 20
AET October / November 2011
www.envirotech-online.com
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