Industries

Construction and building industries

Wastewater impurities are eliminated by physical, chemical, and biological methods. The various techniques are often divided into three categories: chemical, biological, and physical unit operations. The principles involved in these activities and processes remain the same, therefore it has been found beneficial to examine their scientific basis independently, even when they occur in various combinations in treatment systems. Biological unit processes are those types of treatment where pollutants are eliminated through biological activity. Wastewater undergoes biological treatment mainly to get rid of biodegradable organic materials that are either dissolved or colloidal. Essentially, these materials are changed into gasses that can be released into space and into biological cell tissue that can be settled to remove. Additionally, biological treatment is employed.