20 Water/Wastewater
Maximum Process Safety with Minimum Maintenance Cost with Sensors in Waste Water Treatment
Ordinary pH sensors used in deammonification are costly to maintain and offer limited process safety considerations. Hamilton (Switzerland), specialist sensor technology manufacturer, has developed an efficient alternative with pHeasy Arc 120.
An important step in the treatment of highly contaminated waste water is nitrogen elimination. The deammonification process, the cost-effective alternative to nitrification/denitrification, is regarded as an innovative nitrogen elimination process with high potential. The measurement of ammonia and nitrous acid values are important to determine the process efficiency, and a conversion ratio can be calculated from the analytical values of nitrite (NO2- ) and ammonium (NH4+ ) with the help of pH.
The measurement of pH is traditionally extremely difficult in the
deammonification process because the use is very costly under current technical requirements: Since the substances contained in the process water can have a negative impact on the pH electrode’s reference, the sensors are regularly recalibrated for safety reasons. Even this high maintenance expense, however, guarantees only limited process safety because new interferences can occur until the time that the next measurement is made. The prerequisite for maximum process safety would therefore be continuous electrolyte control, but this cannot be conducted with conventional sensors.
Hamilton has developed a pH sensor that guarantees continuous electrolyte control with pHeasy Arc 120., By integrating CheckRef, a second reference check that monitors the status of the reference electrolytes is conducted. When the threshold value of the maximum permissible potential difference is set at the start, an alarm signal indicates the calibration need and the measuring capability and quality is permanently monitored. Process errors caused by unrecognisable interferences of the pH electrolyte are ruled out. Thanks to an extremely stable reference derivation and the patented Polysolve electrolyte, a permanently high reference quality is also ensured.
A long-term study carried out by the Hanover Institute for Urban Water Management and Waste Disposal Technology (ISAH) has impressively proven the efficiency of Hamilton’s pHeasy Arc 120. Used in a reactor with process water from sludge dewatering, it gave stable and accurate measurement values for about ten months. Only afterwards did the reference quality of the electrolyte diminish and the sensor reliably indicated when the threshold value set at the start was exceeded.
In addition to increased process safety, pHeasy Arc 120 users also benefit from the general advantages offered by the Arc Sensor System that Hamilton has developed: By integrating the transmitter in the sensor’s head, no measurment amplifier is needed. The sensor thus communicates directly with the process control system, optionally through an analog standard (4-20 mA) or digital modbus interface (RS 485). Moreover, Arc sensors provide a full overview of sensor quality, operational life, warnings or error messages and a lot of additional information needed for the logbooks of the measuring points.
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25947pr@reply-direct.com Hydrotest Data Loggers Delivered to South East Asia
Aquatec Group (UK) have recently integrated their HYDROlog 2000 Hydrotest Data Logger instruments with a hot stab connection to provide a simple ROV-deployable and retrievable solution for a major pipeline pre-commissioning company in South East Asia.
The HYDROlog range was developed to provide a pressure and temperature record of pipeline hydrostatic test procedures that take place during the pipeline pre-commissioning phase. A steady pressure record that remains above the required minimum test pressure allows the contractor to sign off on the installation. The temperature record is used to account for pressure variations due to changing ambient temperature.
By coupling the instrument to a hot-stab, it can easily be removed by an ROV immediately after the minimum pressure hold time has been met, and taken to the surface for data download and analysis, thus saving valuable ship time.
The integral hot stab is one of several methods for deploying the HYDROlog instruments. Other solutions include the use of subsea ROV-readable displays, real-time optical data links, and acoustic data links. Models are currently available to monitor test pressures up to 1400 bar.....
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Aquamatic Ltd (UK), specialist manufacturer of automatic wastewater sampling equipment, have supplied an outdoor, temperature-controlled, MCERTs Certified wastewater sampler system to Patak’s Foods, where it is being used to help monitor effective effluent treatment through Patak’s recently installed Dissolved Air Flotation (DAF) plant.
As Patak’s has grown, so of course has its factory, leading to an investment in a high specification DAF plant from European leader Nijhuis as an important part of the company’s waste and effluent management strategy. Nijhuis recommended that Patak’s brought Aquamatic in to provide the equipment to reassure them of the DAF plant’s effectiveness.
Aquamatic supplied an MCERTs certified Aquacell S320H wastewater sampler to take regular, accurate, automatic samples of the effluent from the DAF plant prior to its discharge from site. The S320H encompasses a robust enclosure, designed for use outdoors, with frost protection and temperature- controlled sample storage to preserve the samples taken prior to their submission for laboratory analysis.
At the heart of the S320H, as with all Aquamatic samplers, is the unique Aquacell sampling module. The vacuum pump driven Aquacell module features a wide bore sample collection system that helps ensure that a truly representative sample is collected without degradation to the effluent itself. Together with simple set-up, rock-solid sample volume control and sample event data logging, the S320H enclosure includes two separate lockable compartments so that the Aquacell module can be accessed without disturbing the collected samples. Customers can choose from a wide variety of single sample collection vessels or built-in multi bottlers depending on the sample regime in use, with Patak’s opting for an integral bottler sampling into a set of twelve, one-litre containers.
Patak’s have also opted for an annual maintenance contract with Aquamatic, which comprises two site visits from an Aquamatic engineer per year to inspect, clean, lubricate and service the equipment, ensuring Patak’s have the peace of mind that the S320H will continue to help them protect themselves and the local environment long into the future.
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Automatic Effluent Sampling Part of Push for Environmental Perfection
ADVANCED – ACCURATE – AFFORDABLE ultrasonic area-velocity flowmeters
COMING SOON – GPRS a cost effective and reliable solution for data transmission for those remote locations
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42ad@reply-direct.com IET Annual Buyers Guide 2013
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Mainstream Measurements Ltd leading supplier of top quality flowmeters worldwide
mainstream MEASUREMENTS LTD flowmeters for open channels & part-filled pipes ™
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