Contribution information

Title Design of ultrapure water production technology on an experimental basis: Danube water
Status Accepted
Final type Lecture
Final session PERMEA 2022 - Drinking and wastewater treatment
Authors R., Shaheen1, E., Cséfalvay2
1 Budapest University of Technology and Economics Faculty of Mechanical Engineering Department of Energy Engineering, Budapest, Hungary
2 Budapest University of Technology and Economics, Budapest, Hungary
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Brief content Regulations on make-up water composition results in the need for advanced make-up water treatment. The classical method used in make-up water treatment starts with coagulation and sedimentation, followed by packed or multimedia filtration, then ion-exchange that uses cation-, anion-, and mixed bed ion-exchangers. Coagulation itself and regeneration of ion-exchange resins require a vast of chemicals. The proper selection of coagulants can help reduce the chemical need for the first step. Sedimentation requires a long residence time, but treatment can be accelerated when filtration is used right after the reactor to remove the flocs, including the suspended solid content. At the laboratory scale, (5-13) μm pore-sized microfilter was used after coagulation which can be treated as efficient in particle removal as gravel filtration at an industrial scale because both can remove the flocs and particles. Membrane separation techniques are classified as environmentally benign techniques, and the new branches have opened up new routes in water treatment. Microfiltration was used to remove the total suspended solid content as a third step. Then, demineralized water can be produced via two ion-exchange steps: cation exchange, degasifier, and anion exchange. They result in pure water having a conductivity of 0.3 μS/cm. A mixed bed ion exchanger can perform a Pre-refining of the pure water to obtain ultrapure water with less than 0.1 µS/cm conductivity. We focus on the proper selection of coagulants and their effect on the consequent microfiltration steps. Danube river and Mediterranean seawater samples were studied and compared to obtain purified water to use as a feed for the desalination step. Based on the experiments, ultrapure water-producing technologies are designed at an industrial scale for fresh and salty water as follows: coagulation by an adequately selected coagulant, gravel filtration, microfiltration, cation-exchanger, degasifier, anion-exchanger, and mixed bed ion-exchanger.
ID 428