Water & Wastewater Asia May/Jun 2021

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IN THE FIELD Fig. 1: Completed zero liquid discharge (ZLD) plant with bioreactor in the background and ultrafiltration and reverse osmosis containers in the foreground WEHRLE ENSURES A WASTEWATER- FREE PRODUCTION for a cosmetic manufacturer Due to the decreasing quality of recycled water, the implementation of a completely wastewaterfree production normally fails. In this article, a conventional wastewater treatment plant has turned its dream of realising zero liquid discharge into reality. 30
WATER & WASTEWATER ASIA | MAY/JUNE <strong>2021</strong> Over the years, freshwater has become increasingly scarce, not only in arid zones but those with sufficient rainfall. This is why years have been spent elaborating concepts for the recycling of industrial rainwater. One difficulty is the fact that a reverse osmosis system must be used in most cases in order to produce the quality required for reuse. However, these same systems produce high salt concentrates, resulting in their disposal expensive and increasingly difficult in large quantities. Fig. 2: Customer requirements for the recycled permeate (grey) versus measured concentration of the recycled water (orange) Though there have been many descriptions and discussions concerning ZLD (zero liquid discharge) throughout the years, few sites worldwide have been able to implement them with consistency. The reason for this is due to the idea that process-operation needs to be well-balanced and the quality of water must be of a high standard, despite the fact that ZLD systems actually cause a further concentrate of the substance. As a result, operations become more difficult and the separate water phase becomes dirtier. Therefore, under continuous operation of such a plant, one has to find the balance between maximal water quality and high concentrations. Fig. 3: ZLD process MODERNIZING A WASTEWATER TREATMENT PLANT INTO A WATER RECYCLING SYSTEM In this context, an initial concept for a water recycling system was designed for an international cosmetics group, which was then further transformed into a ZLD concept via transformation of external site conditions, e.g. a conventional wastewater treatment plant used for mixed production wastewater had previously been in operation (with a throughput of about 7m³/h). However, since it was non-compliant with the discharge requirements of the local industrial zone, WEHRLE was contracted to double its plant capacity and upgrade it to a Membrane Bioreactor (MBR), effectively making it future-proof. As seen in Fig. 1, the membrane units are container constructions that have been delivered operationally-ready to its customer. An additional one-stage reverse osmosis plant (ROI) was installed, but at the customer’s initial request (see Fig. 2) for a throughput of about 8m 3 /h with optional extension. Since the customer was convinced about the concept, he decided to make it independent from the sewage treatment system. To this end, two 31
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Page 4 and 5: CONTENTS WATER & WASTEWATER ASIA |
Page 6: FROM THE EDITOR WATER & WASTEWATER
Page 9 and 10: WATER & WASTEWATER ASIA | MAY/JUNE
Page 20 and 21: 5 MINS WITH GLOBAL WATER AWARDS: Re
Page 22 and 23: 5 MINS WITH WATER & WASTEWATER ASIA
Page 24 and 25: 5 MINS WITH WATER & WASTEWATER ASIA
Page 26 and 27: IN THE FIELD DON’T SLEEP with a l
Page 28 and 29: IN THE FIELD FROM PEAT WATER TO DRI
Page 30 and 31: IN THE FIELD WATER & WASTEWATER ASI
Page 34 and 35: IN THE FIELD WATER & WASTEWATER ASI
Page 36 and 37: FOCUS New systems must be designed
Page 38 and 39: FOCUS WATER & WASTEWATER ASIA | MAY
Page 40 and 41: FOCUS can easily be designed and th
Page 42 and 43: FOCUS WATER & WASTEWATER ASIA | MAY
Page 44 and 45: VIEWPOINT such as third-party inves
Page 46 and 47: VIEWPOINT READY OR NOT, here ICS co
Page 48 and 49: VIEWPOINT Electrical Incidents can
Page 50 and 51: HOTSEAT THE GAME- CHANGING technolo
Page 52 and 53: HOTSEAT THE PROCESS 1 2 3 4 5 Seawa
Page 54 and 55: HOTSEAT WATER & WASTEWATER ASIA | M
Page 56 and 57: SWA [Hybrid] Event - in conjunction
Page 58 and 59: Thai Water Expo 2021 14 to 16 Octob
Page 60 and 61: ON OUR RADAR WATER & WASTEWATER ASI
Page 62 and 63: ON OUR RADAR KSB AUSTRALIA INVESTS
Page 64 and 65: LET US DEVELOP, MARKET AND MANAGE Y
Page 66 and 67: ADVERTISERS’ INDEX WATER & WASTEW
Page 68: TECHNOLOGY THAT’S TRUSTED THE WOR

Water & Wastewater Asia May/Jun 2021

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