Water & Wastewater Asia November/December 2019

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30 | FROM THE GROUND Reliable chloramination reduces maintenance and improves quality for water corporation By Ken Chen, Sales Engineer (Rosemount), Emerson Automation Solutions 1 1: The accuracy of the system helps to reduce remote site visits from 16 to four per month 2: To remedy the corporation’s water purification problems, Emerson’s Ammonia Monitoring System was selected 2 A regional water corporation in southern Australia with many remote sites uses chloramination to assure residual water purification in its long pipe runs, which can be up to 30 kilometres long. The water corporation previously used a system that required reagents, but discontinued its use several years ago after that particular reagent-based system added expenses of $300 per system per month. In addition to the cost, the reagents had to be refrigerated and many of the remote sites did not have power sufficient for refrigeration. Maintenance personnel had to visit the sites with the refrigerated reagents on a regular basis, increasing maintenance time. When compared to the lack of consistency in measurement that the water corporation discovered with the system, all this was a small problem — the deviation was huge among measurements from grab samples. The region experiences large variations in water demand seasonally (from 10 litres per second to 250 litres per second at the major potable water storage facility), and the system failed to capture accurate measurements, which cause underdosing or overdosing of chemicals that resulted in water quality issues. Overdosing could cause an odour to be detected in the drinking water, while underdosing could lead to the growth of bacteria and other microorganisms that pose a risk to water safety. As a result, the personnel made multiple visits to the remote sites weekly to take grab samples to test water quality and assure safety for customers. THE SOLUTION The water corporation was using costly and time-consuming field-based equipment to compensate for not having a monochloramine system, so it worked quickly to remedy the problem and sought out new alternatives. The corporation selected Emerson’s Ammonia Monitoring System. This consisted of a free-chlorine panel with flow cell adapter, plus a Rosemount 499ACL Chlorine Sensor and a Rosemount S10046 ammonium sensor; all controlled by the Rosemount 56 dual-channel transmitter on a pre-engineered water quality panel. The system was installed at three sites with a fourth to come. THE RESULTS The Emerson system does not require reagents, which immediately eliminated the cost of the consumables — $300 per system per month. It also removed the need for site trips to replenish refrigerated reagents. Most importantly, the system provided consistent and reliable measurements, with minimal deviation from grab samples, even under tremendous high-demand as well as low-demand conditions. Now the water corporation is confident in the accuracy of the system readings and has reduced remote site visits from 16 to only four times per month, freeing up personnel for other important tasks. The water corporation expressed that they were “extremely happy” with the high accuracy and reliability of the system, which has assisted in full trihalomethane regulatory compliance, as well as lowering maintenance requirements and costs, and is considering additional units to aid in nitrification monitoring. WWA Water & Wastewater Asia • November / December 2019
INSIGHT | 31 Strategic alliances: Driving innovation in the water industry Joke Cuperus has been working hard ever since taking the helm as CEO of Dutch-owned water utility PWN in 2015. For instance, she signed an agreement last year with Japanese ceramic membrane specialist METAWATER to strengthen existing cooperation, and to promote the development and use of ceramic-membranebased water treatment technologies. Recently, another partnership took place. In late August this year, PWN signed a memorandum of understanding with South West Water and Singapore’s National Water Agency PUB to form a utilities alliance aimed at sharing knowledge and information about the latest innovations, operational data and best practices on ceramic membrane systems for the next five years. Cuperus explained, “[The alliance] was formed due to an idea by PUB. I really liked that they proposed it because in the UK — South West Water, Anglian Water and Scottish Water — already have the membranes and are testing the innovations, and this alliance is a good idea to collaborate, share knowledge and experiences, and help each other with operational labour.” In addition, the alliance also aims to help with manpower and training courses. CONSTANTLY INNOVATING Ceramic membranes [PWNT’s CeraMac ® ] are currently the latest innovation in the membrane filtration technology, and Cuperus feels that more utilities will get on board with using this technology as they gain better understanding about how ceramic membranes differ from their polymeric cousins. “For the next decade or so, more people will gravitate towards using ceramic membranes as they are sustainable and a good solution. Polymeric membranes have a very short lifespan, but this [the ceramic membranes] is for 20 years. Some even go on for 30 to 40 years, depending on their usage,” she said. As more utilities make the shift towards ceramic membranes, Cuperus is now looking at how the technology can address issues such as the detection of microplastics and antibiotics in drinking water. “[Ceramic membranes] have very small holes, smaller than the ones in polymeric membranes. But we know that nanoplastics are so small that even those holes can’t keep them out of the water,” she explained. And so, PWNT has been focusing on developing and refining the technology to provide an efficient and sustainable solution. “It will take years of testing before any new technology can be adopted. This is to ensure that we’re not adding any risks to safe drinking water,” Cuperus explained. But with the company’s advanced research & development, the industry is already looking forward to how PWNT will tackle the issues with its well-known highly economical and compact solution. WWA Signing of a Memorandum of Understanding by PUB, PWN and South West Water to form a utilities alliance for sharing of knowledge and best practices on water treatment Water & Wastewater Asia • November / December 2019
Page 4 and 5: 22 18 31 16 54 CONTENTS WATER & WAS
Page 6 and 7: EDITOR’S NOTE THE POWER OF DATA W
Page 8 and 9: 6 | NEWS New protection module for
Page 10 and 11: 8 | NEWS PUB opens world’s larges
Page 12 and 13: 10 | NEWS Siemens and Grundfos sign
Page 16 and 17: 14 | IN PERSON ANDRITZ Regional Sal
Page 18 and 19: 16 | IN PERSON De Nora’s new CEO
Page 20 and 21: 18 | IN PERSON Ecolab: Credible, Re
Page 22: 20 | IN PERSON GOING DEEPER WITH PE
Page 25 and 26: FROM THE GROUND | 23 In a world of
Page 27 and 28: FROM THE GROUND | 25 SUEZ modular w
Page 29 and 30: FROM THE GROUND | 27 (Mali). This W
Page 31: FROM THE GROUND | 29 the need for l
Page 36 and 37: 34 | INSIGHT Huba Control’s Regio
Page 38 and 39: 36 | INSIGHT Technology meets susta
Page 40 and 41: 38 | INSIGHT Continuous microbial m
Page 42 and 43: 40 | INSIGHT Maxing out brine recov
Page 44 and 45: 42 | INSIGHT Resource recovery from
Page 46 and 47: 44 | INSIGHT was passed back to the
Page 48 and 49: 46 | INSIGHT Digitisation and autom
Page 50 and 51: 48 | OPINION Industry 4.0 in the wa
Page 52 and 53: NEWSLETTER OF THE SINGAPORE WATER A
Page 54 and 55: SWA 16 TH ANNUAL GENERAL MEETING 9
Page 56 and 57: 54 | TECH ROUND UP Modern problems
Page 59 and 60: TECH ROUND UP | 57 Plug and work wi
Page 61 and 62: SHOW REVIEW | 59 SIWW 2020: Climate
Page 64 and 65: 62 | SHOW REVIEW CAMWATER 2019: A r
Page 66: ADVERTISERS INDEX WATER & WASTEWATE

Water & Wastewater Asia November/December 2019

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