The treatment and discharge of industrial wastewater is a critical area of concern. Given the severe water scarcity, relevant authorities have attached greater importance to wastewater treatment. This article explores the recycling of industrial wastewater.
Types of Industrial Wastewater
To recycle industrial wastewater, it is first necessary to understand its main types:
1.Circulating water system wastewater:
Industries such as metallurgy and electroplating use closed or open circulating water systems. The wastewater generated contains high levels of heavy metal pollutants; improper treatment may lead to unpredictable consequences.
2.Production process wastewater:
Wastewater from processes in sintering plants, cold rolling mills, etc., if discharged without treatment, poses environmental risks.
3.Water purification byproduct wastewater:
Wastewater from the production of desalinated water or concentrated hydrochloric acid contains high concentrations of calcium, magnesium, and iron ions. Direct discharge severely contaminates water sources.
Methods for Industrial Wastewater Recycling
Industrial wastewater often has color and contains heavy metals (e.g., mercury, iron, aluminum, copper). Resin exchange effectively removes heavy metals to meet discharge standards, but it fails to address water discoloration. Ion exchange resins, however, resolve this issue. Adding biological agents during treatment enhances purification efficiency.
Once wastewater meets quality standards, it undergoes advanced treatment for reuse—either for on-site cleaning and irrigation or to meet process water requirements. In the context of rapid economic development, low-cost, high-efficiency technologies are essential to minimize water pollution’s harm to ecosystems and human health.
Quality Verification
Water quality analyzers are critical for verifying compliance. Different parameters require specialized instruments: for example, aluminum is detected with an online aluminum analyzer, mercury with the T8000-Hg online mercury analyzer, and total copper with the T8000-Cu online total copper analyzer. These devices are independent and cannot be used interchangeably.
