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Zero discharge treatment process for industrial wastewater
- 2019-08-13-

1. A zero-discharge treatment process for industrial wastewater from a steel plant, including an industrial wastewater treatment process, characterized in that the concentrated brine treatment process deeply processes concentrated brine.

2. The zero-discharge treatment process for industrial wastewater from a steel plant according to claim 1, characterized in that: the concentrated brine treatment process is to use an ion exchange resin to treat the concentrated brine, and to remove Ca2 +, Si2 + ions that have a large impact on membrane operation Then, a seawater membrane or a brackish water membrane is used for secondary reverse osmosis treatment, so that the concentrated brine is greatly reduced. For the concentrated brine, solidification or low-temperature multi-effect transpiration crystallization treatment is selected.

3. The zero-discharge treatment process for industrial wastewater of a steel plant according to claim 1, characterized in that the industrial wastewater treatment process is to control the source of industrial wastewater and enhance conventional treatment measures to reduce the amount of wastewater generated and increase the reuse of water Utilization, reducing the amount of advanced wastewater treatment.

Manual

Zero-discharge treatment process for industrial wastewater in iron and steel plant

Skill category

The invention belongs to the category of water supply and drainage in the iron and steel industry, and specifically relates to a process for zero discharge treatment of industrial wastewater in a steel plant.

Skill background

Iron and steel plants, as large urban water users, will have a total circulating water volume of about 2 to 5% in the circulating cooling water system; together, a small amount of oily wastewater, weak acid and alkaline wastewater and washing wastewater will also occur in each production workshop. After the above-mentioned several kinds of wastewater are collected, they are transported to the central water treatment plant through the wastewater drainage pipe network as industrial-wide industrial wastewater, and then collected or reused.

The industrial wastewater treatment process is shown in Figure 1: Industrial wastewater enters the conditioning tank, and the conditioning tank enters the high-efficiency air flotation tank, the flocculation sedimentation tank, and the homogeneous filter material filter in order to complete the basic treatment and enter the reuse tank; a part is used for water quality requirements For the users who are not high in the whole plant, the other part needs further treatment. In order to achieve the reuse of industrial wastewater, it needs to be treated in depth. The water in the reused pool is further processed through activated carbon filters and security filters. The separated produced water enters the industrial pool and is provided to industrial water users throughout the plant. Concentrated brine with high salt content and heavy metal ion enrichment will occur during processing. At that time, there was no effective treatment method for this type of wastewater, and it was simply directly discharged, which caused great pollution to the receiving water body.

Summary of the invention

Aiming at the current status of industrial wastewater treatment technology in steel plants at home and abroad, a zero-discharge treatment process for industrial wastewater in steel plants was provided. The present invention saves capital, is easy to complete, has obvious treatment effects, and is particularly suitable for industrial wastewater treatment processes for domestic steel companies. Zero discharge of industrial wastewater in the true sense.

With the vigorous development of China's circular economy and the continuous promotion of sustainable industrial policies, the steel industry is required to gradually change from the extensive form of "high pollution, high consumption" to the "low emission, low consumption, and high efficiency" saving form. change. The recycling and even zero discharge of wastewater from the iron and steel industry has gradually begun in the industry, and has become a hard index proposed by local governments and environmental protection departments where some steel mills are located.

Zero discharge of industrial wastewater from iron and steel plants can be achieved through source control, enhanced treatment, reduction of concentrated brine, and transpiration crystallization. The invention provides a treatment process, which comprises:

(1) Industrial wastewater treatment process: Source control of industrial wastewater and enhanced conventional treatment measures to reduce the amount of wastewater generated, increase the utilization rate of recycled water, and reduce the amount of advanced wastewater treatment.

(2), concentrated brine treatment process: advanced treatment of concentrated brine. The concentrated brine is processed by ion exchange resin, security filter, brackish water membrane or seawater membrane reverse osmosis device, and the generated water is supplied to the general water users of the plant. The concentrated brine enters the concentrated brine tank, and is evaporated and crystallized or solidified. The concentrated brine is treated with ion exchange resin. After removing Ca2 +, Si2 + and other ions that have a large impact on the operation of the membrane, the seawater membrane or brackish water membrane is used for secondary reverse osmosis treatment, so that the concentrated brine is greatly reduced, and the concentrated brine is solidified. Or low-temperature multi-effect transpiration crystallization treatment, solid transport to landfill, and complete zero discharge of wastewater in the true sense. The invention can be widely used in the industrial wastewater treatment of domestic iron and steel enterprises to complete zero discharge of industrial wastewater.

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