Municipal water treatment with ion exchange resins and iron oxide adsorbers
Drinking water supply, waste water treatment, and waste disposal are among the most critical municipal services. Strict demands are imposed on the purity of drinking water as our most important nutrient. Only responsible treatment practices make it possible to maintain a continuous cycle for turning waste water back into water suitable for people, animals, agriculture, and industry. Waste products and other potential pollutants must be stored and disposed of in such a way that they cannot get into the water cycle. However, the latter is not always guaranteed unfortunately, making complex treatment operations necessary.
In the treatment of drinking water and waste water, ion exchange resins benefit from their unique ability to selectively bind ions. Thus special grades of Lewatit® ion exchange resins can be used to remove harmful constituents such as iron or manganese from drinking water, as well as traces of pollutants such as arsenic and lead. Even groundwater can be treated efficiently in this way, in which detrimental constituents such as chromate, nitrate, per- and polyfluoroalkyl substances (PFAS), surfactants, and perchlorate are bound to ion exchangers. Ionic and non-ionic contaminants, which could otherwise disrupt operations in biological water treatment plants or endanger the environment, can be removed from waste water just as efficiently.
For these and other applications, LANXESS offers a comprehensive range of special ion exchange resins and inorganic adsorbers that are tailored to specific requirements. Find the best product for your needs now.
In addition to ion exchangers, LANXESS offers inorganic adsorbers that can be used in municipal drinking water and waste water treatment. The Bayoxide® inorganic adsorbers range comprises technical iron oxide adsorbers in granular form. The product variants are based on defined crystalline α-ferric oxide hydroxide structures and are particularly suitable for removing arsenic and phosphate from drinking water or waste water, but can also remove other metal ions and oxyanions. Bayoxide® products are used in a continuous fixed bed process in which the contaminated water is selectively purified. As a result, this technology can be integrated in existing facilities simply and economically.
PFAS is a family of highly efficient surface active agents used in various applications such as firefighting foams, water repellent textiles, cook ware, galvanics, paints. When they are however, not handled and disposed thoroughly they can leach into the ground water where they persist due to their high chemical stability.
Even worse, PFAS bioaccumulate in humans, animals and plants and cause severe health issues including cancer. As a result, out of their hazardous potential, drinking water limits were set very strictly. Standard technologies such as activated carbon usually can not comply with the low effluent limits for short chain PFAS that represent the biggest challenge in remediation.
Reverse osmosis on the other hand generates large amounts of aqueous concentrates that have to be handled. LANXESS therefore developed a new family of selective ion exchange resins, that reduce PFAS reliably below the drinking water limits and which can safely be disposed after use.
Thanks to their very high surface area and adsorption capacity, Bayoxide® iron oxide adsorbers can remove arsenic selectively and reliably below the limit value of 10 µg/l. Here, the efficiency is increased considerably if any As(III) present is converted into As(V) by means of oxidation. Compared with conventional adsorption media, the proven product for this application, Bayoxide® E 33, enables significantly longer operating times for the filters due to higher capacity.
The arsenic is attached to the adsorbers In the form of arsenate via a covalent bond and can therefore be disposed of very simply as a solid. Due to the low As concentration that can be reached in the process at the beginning of the cycle (<< 5 ppb), the operating time of the adsorber can be extended significantly through dilution with the untreated water. The product types Bayoxide® E 33 and Bayoxide® E 33 HC are suitable for use in drinking water treatment and have the necessary certificates for this application.
DOWNLOADS
- Lewatit® and Bayoxide® Product Guide(PDF, 5.4 MB)
- PFAS removal with Lewatit®(PDF, 1 MB)
- Waste Water Treatment with Lewatit®(PDF, 4.8 MB)
- Phosphate Removal with Bayoxide®(PDF, 662.4 KB)
- Flyer Bayoxide® E 33(PDF, 616.6 KB)
- Flyer Bayoxide® E 33 HC(PDF, 361.5 KB)
- Flyer Bayoxide® E IN 20(PDF, 321.5 KB)
- Flyer Bayoxide® E IN 30(PDF, 368.6 KB)
- Flyer Lewatit® TP 106(PDF, 417.1 KB)
- Flyer Lewatit® TP 107(PDF, 362.6 KB)
- Flyer Lewatit® TP 108 DW(PDF, 571.7 KB)
