What is ZLD Plant for Steel Industry?
Water is used extensively in steel factories for a variety of industrial operations. All of these procedures are necessary and important to the production of steel, and because they utilize a lot of water, they also produce a lot of wastewater. The procedure where the water is utilized and the purpose, for which it is used, determine the quality of the wastewater.
It is sometimes believed to be difficult to achieve ZLD, or Zero Liquid Discharge, levels by restoring water to usable quality, and recycling it in industrial operations since the amounts are so large. In this blog, we will see if Zero Liquid Discharge treatment is useful in steel industries.
Zero Liquid Discharge treatment plant for steel industries
There are a variety of processes that take place in a steel plant.
It includes cooling or heating (steam based), dust suppression, the ore beneficiation process and cleaning of raw materials, temperature control (heat treatment), transport of waste materials (ash, sludge, and scale, etc.,), moisture content of coking coal, pelletizing of sinter mix, making of green pellets during the production of iron ore pellets, and production of steam.
Due to the use of ores and extensive coal burning, the contaminants from a steel plant are also very different, from most other industries, but they do happen to be somewhat closer to those from the mining industry or thermal power plants. For instance, cyanide and ammonia are invariably present in cooling solutions. Gasification by-products including benzene, naphthalene, anthracene, ammonia, phenols, and cresols, are among the waste streams that are contaminated. There are also a number of more complex substances known as polycyclic aromatic hydrocarbons (PAH).
Contamination of water in steel industries
Iron or steel must go through hot and cold mechanical transformation stages, in order to be transformed into sheet, wire, or rods. These stages typically use water as a lubricant and coolant. A new set of pollutants, such as hydraulic oils, tallow, and particle particulates, would be present during this process.
The final treatment of iron and steel items before they are sold includes pickling in a potent mineral acid, to remove rust and prepare the surface for galvanising, painting, tin or chromium plating, or other processes, which extend the life of the finished product. Hydrochloric acid and sulphuric acid are the two most often utilized acids, and as a result, they are added to the wastewater during the acidic rinsing process.
Environmental effects of wastewater produced from steel industries
The following are often the main environmental repercussions of discharge into surface waterbodies, with this lethal mixture of chemical pollutants, heavy metals, minerals, and acids in the wastewater:
· Toxic effects on aquatic life, sometimes even leading to catastrophic extinctions,
· Decreasing the amount of dissolved oxygen, killing all aquatic life,
· Sludge build-up from suspended solids would choke soil capillaries, and prevent the aquifer from being recharged through a surface water body,
· A rise in water temperature that destroys the wetland's fragile biodiversity,
· Formation of a thick layer of FOG that would cover the water body from the top, and deflect sunlight, stopping the process of photosynthesis in nature.
Is Zero Liquid Discharge Treatment plant the successful answer?
ZLD is a beneficial technology for reduced water loss and increased water recovery. It not only saves fresh water, but finds a way to save environment with minimal pollution levels.
1: Water recovery rate, up to 85%
2: Concentration: seven times
3: Reusing distillate in the production process, and
4: Cost-saving measures for disposing of solid salt slurry ZLD.
Consult the best Zero Liquid Discharge Experts in India
Providing complete solutions for water treatment, industrial wastewater treatment, sewage treatment, desalination, and Zero Liquid Discharge (ZLD) solutions at affordable prices, Netsol Water is a leading global provider of water management services. We have knowledge of designing low-cost treatments for difficult-to-treat wastewater.
Our area of expertise is integrating our teams for the project's smooth implementation. We strive to implement innovative technology, lessen our environmental impact, conserve energy, and provide a cutting-edge water treatment facility.