Water & Wastewater Asia September/October 2022

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SINGAPORE FOCUS 3E-NF HOLLOW FIBRE NANOFILTRATION MEMBRANE delivers heightened and efficient performance Suited for use across the water and wastewater treatment industry, the 3E hollow fibre nanofiltration membranes offer significant benefits to operating systems. With that, Fu set out to tackle these issues through hollow-fibre (HF) nanofiltration membranes (NF). 3E’s HF NF membranes products, launched in 2019, are the world’s first HF NF membranes that have achieved largescale production with low energy consumption, customised salt rejection rate, elevated operation temperatures, and significant oxidation and fouling resistance. Applications for the membrane include municipal and industrial wastewater recycling, cooling tower water treatment, direct drinking water, seawater reverse osmosis pre-treatment and zero liquid discharge. 3E-NF membranes differ from the traditional spiral NF membranes and some developing HF-NF membranes. This is due to the rejection of MgSO 4 found in these two membranes, which are between 80-96%, making them suited for only drinking water and the production of NEWater. However, the 3E-NF offers a wider rejection rate of 5-95%, allowing it to be used across different applications, ranging from seawater desalination pretreatment, material separation to NEWater, as well as the production of drinking water. The membranes support wastewater recycling for cooling towers Having served more than 20 years in the due to the dead-end corners in the feed industry for embarking on a research and permeate spacers of the spiral-wound career, Fu Fengjiang noticed the existing configuration. Furthermore, these membranes problems with spiral-wound reverse demanded high operation pressure with high osmosis (RO) and nanofiltration (NF) energy consumption, and necessitated the membranes: they were not only overtreating the water, and thus making it went into the RO/NF system; there was addition of reductants before the feedwater undrinkable by removing all minerals, also a restricted product range for other but they also had poor fouling resistance applications. The 3E NF membrane offers the following advantages compared to other types and brands of NF membranes. 1. Unlike other HF NF coatings which can be peeled off easily as glue to the skin, the one-step 3E NF coating adheres to the surface like a second skin; 2. Strong anti-fouling property with super hydrophilic and smooth selective layer surface; 3. High resistance to antioxidant substances, this means chemical cleaning can be used for avoiding biofouling; 4. Lower operation pressure and less footprint 12 WATER & WASTEWATER ASIA | SEPTEMBER/OCTOBER 2022
SINGAPORE FOCUS MARICULTURE WATER RECYCLING 3E-NF membrane has been used for seawater fish farm wastewater recycling, laundry wastewater recycling, municipal wastewater recycling for cooling tower feed water, and more. In particular, the membrane is suited for desalination pretreatment. The 3E NF membrane module Desalination plants generally use two types of membranes: UF as a pre-treatment to remove suspended particles, and RO to remove the dissolved solids. The UF membrane pre-treatment for the seawater desalination is unable to remove hardness and the majority of organic pollution, and consequently the RO system is prone to fouling and scaling. This leads to more production downtime for the RO system cleaning and maintenance as well. While the water industry has been assessing the removal of hardness through NF membranes for a long time, no spiral-wound NF membrane can replace the existing UF membranes due to the space and flux constraints. On the other hand, HF NF membranes improve desalination pre-treatment. As they have the same configuration as UF membranes and are capable of removing hardness, they are a one-toone replacement that will reduce the overall capital and operating expense of the desalination plants. With a wide range of salt rejections to better suit difficult feedwater qualities and permeate standards, 3E NF membranes, can deliver clean water with valuable ions preserved. One of the company’s products was used in a seawater fish farm to achieve low energy water recycling in Singapore. Led by the Singapore government and Singapore Fish Culture Association, along with Ngee Ann Polytechnic’s Environmental & Water Technology Centre of Innovation, Aquarium Iwarna, a marine ornamental fish import and export company, cooperated with 3E for the commissioning and installation of a nanofiltration membrane wastewater reuse system offering a 0.5m 3 /h capacity. The system delivered the following specifications: • Feed: 38,000.0ppm • Flux: 0.4±0.5 litres per hour • Salt rejection: 20±0.3% (2000ppm MgSO 2 ) • Operational pressure: 2.0 bar With the 3E nanofiltration membrane, water can be taken directly from the fish pond, reducing equipment and overall operation costs. More than that, the 3E-NF can remove green algae via a variety of methods, including backwashing, resulting in a more stable system operation, in contrast to conventional nanofiltration and reverse osmosis membranes which are sensitive and prone to the blooming of green algae in sea water. SUPPORTING WATER RECLAMATION With up to 40LMH/bar flux, 3E-NF05 can also be used to achieve one-to-one replacement of the traditional UF membrane for the seawater desalination to reduce the RO membrane fouling and scaling issue without any footprint enlarge. In another project, a 3E-NF05 HF membrane system, with a 2,000m 3 per day capacity NF-RO membrane system design for cooling tower feed water, was supplied, commissioned, and installed for the Shangdong Kytoland Watertech. The organisation had decided to use this system in order to reduce demand of the Anqiu thermal power plant for tap water, and to preserve current drinking water resources. After careful investigation, the 3E NF-RO membrane was utilised in 2020 to treat the reclaimed water, meeting discharge standards; it was used for the cooling tower’s water at the thermal power plant after reaching the same standards as well. With the NF-RO reclaimed water treatment equipment, 3E thus attained its first reclaimed water reuse project. The system thus presented the following parameters: • Effective membrane area: 61.0m 2 • Water flow rate: 128±0.5 ton/day per bar • Operation pressure: Maximum 3.0 bar • Salt rejection: 2000ppm; MgSO 4 : 10±1% • Maximum free-chloride resistance: 1000ppm With the 3E-NF membranes, the overall system will be able to run in a more stable manner with a low maintenance cost. This is due to the compact surface which is not easily polluted, while also offering a membrane flux that is close to ultrafiltration membranes. In comparison, ultrafiltration membranes offer a molecular weight rejection rate of more than 5000da, which cannot intercept the hardness of and organic matter in water, resulting in the scaling and pollution of the back RO membrane. In addition, the 3E-NF membrane can be used in a variety of ways, including backwash to remove biological pollutants, among others; its operating conditions are also similar to those of ordinary ultrafiltration membranes. Altogether, the use of 3E-NF has supported a more reliable, stable and feasible reuse of municipal wastewater. WATER & WASTEWATER ASIA | SEPTEMBER/OCTOBER 2022 13
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Page 4 and 5: CONTENTS 12 16 CONTENTS 04 Editor
Page 6: FROM THE EDITOR THE WATER UNDER THE
Page 9 and 10: NEWS SEVERN TRENT WATER BEGINS $2M
Page 11 and 12: NEWS CARESOURCE AND ELEVATE VENTURE
Page 13: NEWS NORTHUMBRIAN WATER LIMITED SEL
Page 17 and 18: IN CONVERSATION WITH This reduces a
Page 19 and 20: IN CONVERSATION WITH In order to ex
Page 21 and 22: IN CONVERSATION WITH Left: The Coli
Page 23 and 24: IN THE FIELD Holme Fen and Woodwalt
Page 26 and 27: IN THE FIELD WBL: A DATA-DRIVEN wat
Page 28 and 29: IN THE FIELD LIGHTER TO HANDLE AND
Page 30 and 31: IN THE FIELD BIM TECHNOLOGY OVERCOM
Page 32 and 33: IN THE FIELD ENDRESS+HAUSER FLOWMET
Page 34 and 35: FOCUS WATER DOWN WITH smart water t
Page 36: FOCUS • Calcite filter to maintai
Page 39 and 40: FOCUS “Resilient” focuses on de
Page 41 and 42: FOCUS AMMONIUM- BASED AERATION cont
Page 43 and 44: FOCUS achieved the lowest unit airf
Page 45 and 46: FOCUS improve the efficiency and ef
Page 47 and 48: FOCUS There are huge gains to be ma
Page 49 and 50: ON OUR RADAR to-transport system th
Page 51 and 52: HOTSEAT AQUEOUS VETS ANNOUNCES seni
Page 53 and 54: 44th Singapore Water Industry Nite
Page 55 and 56: VIETWATER EXPO 2022 9-11 Nov 2022 V
Page 57 and 58: ON OUR RADAR SENSOREX OFFERS chemic
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Page 61 and 62: Energy Recovery Solutions for a Sus
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LET US DEVELOP, MARKET AND MANAGE Y
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Water & Wastewater Asia September/October 2022

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