Headworks are mainly used in the process of waste water treatment, where the water can be clean from wastes and can be made pollution free. This water can again be reused for some purpose or the other. The process where this waste water treatment takes place is known as the sewage treatment plant. The water pollutants are usually removed or broken down in this sewage treatment plant so that the treated water can be redirected to some other use.

Chemical and Biological waste water treatment plants are the two most common types of waste water treatment plants. Biological plants use bacteria and different types of biological matter for the treatment of wastes, whereas Chemical plants generally use chemical reactions and processes for the treatment of waste water. The wastes released from the households or the business premises are known as the biological wastes whereas the wastes which are released from the industries and factories are considered to be as the chemical wastes. The toxins and the chemicals released from the industries and the factories harm the environment on a large scale.

There are different processes involved in the waste water treatment which is denoted below.

Separation of impurities through sedimentation and filtration
Oxidation which includes the process of biochemical and chemical oxidation
Polishing through the process of chemical reduction of pH and carbon filtration.

Often BOD reduction process is used as a conventional pollutant to measure the effectiveness of the sewage treatment plants. BOD stands for Biological Oxygen Demand or Biochemical Oxygen Demand. The two different types of methods used in the BOD process are

The method of Dilution which is used to measure the dissolved concentration of oxygen in water by the sample corresponding to the diluting factor and

The method of Manometric which is used in the measurement of consumption of oxygen only due to carbonaceous oxidation and not ammonia oxidation.


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