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Steel Industry Successful Case

1. Back ground


The steel industry consumes large volume of water and discharges of huge volume of waste water. Industrial waste water including the circulating cooling water, sewage water and desalted water in the process of steel production operation of sewage water, desalted water, demineralized water and brine water.


In recent years, with the promotion of energy-saving and emission reduction, continuously promoted the introduction of membrane technology of water treatment, energy consumption of iron and steel industry continued to improve, water consumption per ton and emissions of major pollutants continued to reduce. In 2015, fresh water consumption per ton steel is 3.25m3, reaching the highest level in history, there are 36 companies fresh water consumption per ton is less than 3m3, compared with 2013, decreased by 7.14%, water recycling rate up to 97.71%, 0.14% higher than 2013.


2. Case - Water recycle project of a large steel plant
The steel company is a giant iron and steel enterprises group with the world's largest production capacity, technology, equipment, and the most advanced stainless steel. 2013 annual output of 9,980,000 tons of steel, sales revenue of 146 billion yuan, profit of 500 million yuan, ranking among the forefront of the industry.
In October 2008, the steel company invested a new sewage treatment project, which was treated as a new industrial water source after the reuse of reclaimed water. At the same time, free service has improved the urban sewage emission reduction structure, so that the industrial water recycling rate reached over 98.2%。
    Project Location:Shangxi China
    Project Name:Industrial Waste water Recycle
    Water Quality:Residential waste water + Steel production waste water
    Use of Permeate Water:Process water
    Time in Operation: Early in 2014
    Capacity: 34000m3/d
    Element Type: PURO-I
    No. of Element: 1071 pics
    RO System Unit:(33:18)×7
    Unit Volume: 200m3/h
    No. of Vontron System:3 phases
3. Cost - Benefit Analysis
The capacity of this  sewage recycling project is designed  as 600m3/h, daily output of 14,000 M3  desalted water, daily water saving 14,000 M3, save  water  about 5, 250 ,000 m3 annually. According to the fixed assets depreciation, energy consumption, the consumption of reagents and artificial management, cost accounting, the desalted water production cost is 3 yuan / ton, the local industrial water price is 3.40 yuan / ton. As the process water, it needs further desalting treatment. The water saving and emission reduction of this plant has been continuously take the leading position in the industry. It has realized the "win-win" strategy in the waste water treatment industry.