Industry cases - Industrial wastewater treatment and reuse

—— High temperature, high alkalinity, high salt content, high-risk water sources behind hidden emissions

As a basic pillar industry, the energy and power industry have a variety of wastewater types, a large discharge scale, and complex and variable composition. It has significant characteristics such as high temperature, high alkalinity, high salinity, and large periodic fluctuations. With the advancement of the "dual carbon" strategy and ultra-high requirements, water environment governance has become an important proposition for the high-quality development of the industry.
Wastewater characteristics:
Wastewater comes from a wide range of sources: including boiler sewage, desulfurization wastewater, cooling tower drainage, chemical water treatment system drainage, flushing wastewater, initial rainwater, etc., with many systems and long processes, and needs to be treated by quality and item.
High salt content and high hardness: Cooling concentrated water and boiler sewage contain a large amount of calcium, magnesium, chloride ions, and sulfate ions. The total salt content can be as high as 5,000-15,000mg/L, which is highly corrosive to equipment.
The composition of desulfurization and denitrification wastewater is complex: it often contains fluorine, sulfate, heavy metals (such as zinc, cadmium, lead), suspended solids, nitrite, etc., and the COD is 300-800mg/L, which requires deep purification.
The pH fluctuates greatly and the water temperature is high: the boiler system drainage is usually highly alkaline, the pH can reach 9-11, and the water temperature is as high as 50-80°C. Traditional treatment systems are difficult to operate stably for a long time.
The drainage volume is large and the periodicity is strong: the unit operating load directly affects the wastewater discharge flow and concentration, and the system needs to have good adjustment capacity and emergency response mechanism.