Project name: Zero discharge of wastewater from steel industry
Customer unit: Hesteel Group
Scheme design: High efficiency clarifying tank + ozone catalytic oxidation tank + multi-media filtration +UF+RO+MVR
Scheme design:
1. Product solution: high efficiency clarifying tank + ozone catalytic oxidation tank + multi-media filtration +UF+RO+MVR
2. Sewage station design total water intake 700m3/h; Concentration section design water 180m3/h
3. Process flow chart
4. Evaporator capacity: 30t/h
5. Evaporation capacity of evaporator: 22t/h; 8t/h; 2.2t/h; Freezing system 8t/h
6. Evaporation material: 2205/TA2 is used as the main material
Product Features
The high-efficiency clarifier is a high-load integrated flocculation/sedimentation/concentration tank. Process features: high surface load (clarifying area surface load 12~25m3/m2·h), saving land and investment; The flocculation effect is good. Good water effect; High mud discharge concentration; Good water distribution to avoid short circuit of water flow; High degree of automation.
Principle of ozone catalytic oxidation tank technology: Ozone catalytic oxidation technology is an efficient deep treatment technology of sewage and wastewater, which is a hot application in the field of water treatment in recent years. Compared with ozone as a single oxidizing agent, the reaction rate of the hydroxyl group formed by ozone under the action of catalyst is higher and the oxidation is stronger. The catalyst can use the strong oxidation of ozone to directly oxidize organic matter in water to CO2 and H2O, or the oxidation and decomposition of macromolecular organic matter into small molecules, making it easier to be degraded.
The multi-medium filter is one of the pretreatment devices of the water treatment system, which is mainly used to filter out some fine particles, suspended matter, colloid, organic matter and other impurities in the water. The use of multi-media filter material (quartz sand, anthracite) specific gravity difference and particle size gap difference, so that the filter material with small gravity and large particle size is located in the upper part of the filter layer to filter the larger particles of impurities, so that the filter material with smaller particle size is located in the lower part of the filter filter. Through the filtration of multi-media filter, the water quality of reverse osmosis influent is improved, which can effectively ensure the service life of the post-stage equipment.
MVR is the abbreviation of mechanical vapor recompression technology, which uses the secondary steam and energy generated by the evaporation system itself to compress low-grade steam into a high-grade steam heat source through the mechanical work of the steam compressor. This cycle provides heat energy to the evaporation system, reducing the demand for external energy, thereby improving thermal efficiency, reducing energy consumption, reducing pollution, and achieving the purpose of energy saving.
Project results
1. In the steel industry, the reclaimed water reuse system can be applied to many links such as cooling, washing, process water, etc., which can greatly reduce wastewater discharge and save a lot of water resources.
2. The operating cost of a ton of water is about 60 yuan, and the operating cost is controlled reasonably to realize the transformation of resources into treasures.