According to the degree of treatment, wastewater treatment (mainly urban domestic wastewater and certain industrial wastewater) can generally be divided into three levels.
The primary treatment task is to remove suspended solid contaminants from the wastewater. For this reason, physical treatment methods are often used.
The secondary treatment task is to substantially remove organic pollutants in the wastewater.
The tertiary treatment task is to further remove contaminants that have not been removed by the secondary treatment, including organics, phosphorus, nitrogen, and soluble inorganic matter that the microorganism failed to degrade. Tertiary processing is synonymous with advanced processing, but the two are not exactly the same.
Technologies related to wastewater treatment contain steps to be taken, from extraction, dewatering and drying to combustion.
Drinking Water Treatment
The quality of drinking water must be impeccable. Today, 60 % of the water is being purified into drinking water. Drinking water treatment not only possess in-depth knowledge in single-stage water treatment processes, like chlorination or UV irradiation but also in complex, multistage processes, like gravel and membrane filtration, ozonization and activated charcoal adsorption.
Urban drainage influences the natural water cycle. The General Drainage Plan (GDP) is an optimal instrument for water protection. It guarantees our water bodies clean water in the future through sustainable planning and structural measures. Urban drainage contains all aspects of drainage, determine the current water quality, and develop and optimize water-linked targets.