Each type of (waste) water is different in terms of quantity and composition or required quality.
Customers need tailored, decentralized solutions.
Every industry has its own requirements.
Water, recyclables in wastewater and energy should be reused at best.
Processing methods must fit into the production process.
There are high demands on experience, quality, reliable operation and services.
Core topics of industrial water management
Resource- and energy-efficient water, wastewater and partial flow treatment – Sustainable concepts and technologies
Water and recyclable materials recycling
Energy from (waste) water
Optimization of resource consumption and lifecycle costs
Automation & Digitization – New Products & Services
Standardization & Modularization – Use savings and improvement potential
Sludge and residue treatment.
Objectives of the working group
The members of GWP come from all areas of water management and have a high level of competence. The objectives of this working group are to bundle and coordinate common topics and interests of the members with a focus on industrial customers. The goals at a glance:
Networking between the GWP network and politics and authorities at an international level
Support of member companies in terms of market access: international industry associations, general contractors, global players/industrial groups
Participation in events, trade fairs and delegation trips in order to focus about industrial water management
Taking up F & E topics such as Zero Liquid Discharge and Industry 4.0 or innovation programmes
The working group interacts with the GWP → regional sessions as well as the other GWP → working groups, which come into contact with the topic of industrial water management within the framework of the body.
More than 400 experts from more than 40 countries will meet – Last minute registration still open! “Overcoming Water
Case study about wastewater treatment in a dye mill in Tirupur, India
12/2019 Tirupur, India
Application and system design
Dying processes require high concentrations of salt to fix the dyes onto the cellulose textile. At the end of the dying process, the wastewater stream consists of a high concen-tration of salts and organics.
In this dying mill in Tirupur, the wastewater is first treated with biological treatment (tertiary treatment) to reduce the amount of organics in the wastewater. This step is followed by quartz filtration. The process water is then passed through an ion exchange treatment stage, consisting of the organic scavenger to remove the organic substances followed by water softening with Lewatit® CNP 80 WS. Since sodium sulfate is added during the process, calcium must be removed to avoid the precipitation of calcium sulfate.
After the ion exchange sequence, 85 m3/h water is passed through a reverse osmosis (RO) system with Lewabrane® RO S400 HR to remove salts and other remaining organ-ics. While the feed contains total dissolved solids (TDS) of 11,000 mg/l the RO process reduces it to less than 100 mg/l. The RO system operates at a recovery rate of 80%. The RO brine with TDS of around 50,000 mg/l is further treated by NF (nanofiltration) membranes to recover the sulfate, while the sodium chloride, which passes through the NF membrane, is concentrated by a multiple-effect evaporator. The sodium chloride salts are finally dried in a solar pan and disposed of as solid waste. The concentrate of the NF process, which contains mainly sulfate, is reused in the dying process.
Membrane and ion exchange performance
State-of-the-art pretreatment is key to achieving these long lifetimes of RO elements while treating difficult industrial wastewater. The scavenger reduces the COD to a level of 35 ppm, which reduces organic fouling and the bio growth potential of the stream. The following softening reduces the hardness to less than 10mg/l, which results in a lower scaling potential. Combined with the high rejection and durability of the Lewabrane® S400 HR elements the expected performance and lifetime can be achieved.
The described industrial example shows that the reduction of wastewater, even in challenging process industries, is possible using the right tools. Lewatit® ion exchange resins and Lewabrane® reverse osmosis elements are a smart and efficient combination to treat wastewater that contains a high load of organics and high salinity.
In industrial water treatment applications, where a high load of organics could pass through pretreatment by ultrafiltration, the use of scavenger resins before RO treatment should be considered. The removal of organics will lead to decrease of fouling on the RO membrane.
Case study about AlexFert fertilizer production in Egypt
Application and system design
Lewabrane® B400 FR elements are installed in the new BWRO plant of Egyptian fertilizer producer AlexFert in Alexandria, Egypt. The water treatment plant is fed with canal water (Nile river as origin) of seasonally variable TDS (300–550 mg/l). The water is pre-treated by coagulation, cold lime softening, and filtration. The RO plant consists of two trains, each of 120 m3/h feed stream and 74% recov-ery. A single train is composed of two stages in a 13:6 array with six elements per vessel. The RO units were placed into an existing water treatment plant, upstream of ion exchange full demineralization trains (SAC – WBA/SBA – MB, with Lewatit® MonoPlus resins).
From the beginning of their use, the Lewabrane® RO elements demonstrated their excellent salt rejection with up to 99.76 % (at 20 °C). This rejection leads to a permeate conductivity in the order of 3 to 5 μS/cm, which significantly reduces ionic load for the resins at the demineralization unit. While maintaining the demanded parameters of deminer-alized water, the cycle times of the demineralization trains are increased by up to four times (depending on season and with a possibility for further increase). Thus, the customer can reduce consumption of specific chemicals for resin bed regeneration by approx. 60%.
Lewabrane® B400 FR exhibits an excellent performance with the difficult Nile surface water. The measured rejection is above expectations. The combination of Lewabrane® B400 FR membranes and Lewatit® MonoPlus resins for demineralization leads not only to the requested final demineralized water conductivity below 0.08 μS/cm / 2 ppb SiO2, but also to a stable and reliable process. Further-more, the new RO plant allows a reduction of specific chemical consumption of the resin bed due to less frequent regenerations.