A coagulant with opposite charge will be added and neutralization of the particle charge will occur. Unnecessary group materials will stick together to form larger and heavier flock particles (Smethurst, 1988). This is called an aggregation process. The agglomeration process is defined as the process of increasing the solids and undesirable masses in the effluent by chemicals (Binnie et al., 2002). The distinct appearance of water surrounding the formed floc indicates that all undesirable particles have solidified and the coagulation process is complete.
The water treatment process has brought many importance to today's society. One of the importance of the water treatment process is to make sure that water is suitable for industrial and personal use. The purpose of the water treatment process is to remove pollutants from the water and make it more suitable for use. There are several methods for treating water such as filtration, mainly to disinfect clean water. Water is no longer a choice at all, so water is the key to human survival. Therefore it is important to make sure that it is purified to drink water. According to a global survey, many people die of aquatic life in most developing countries in the early stages. Therefore, it is very important to perform appropriate water treatment for a healthy life.
The process of recycling water. Since there are various processing techniques to achieve substantially the same results, the utility typically describes the various stages of processing, not the technique used when referring to water quality. In general, the four central stages of treatment are initial treatment, primary treatment, secondary treatment, and tertiary or advanced treatment. The main purpose of traditional wastewater treatment (ie the four phases above) is to reduce the nutrient burden on the environment and thereby maintain the health of aquatic ecosystems. For circulating water applications, conventional wastewater treatment complements additional processes to achieve consistent quality for the intended application. Regenerated water will undergo at least some form of disinfection (WateReuse Association, 2011b).
In addition to developing process technology, chemical science is the key to developing local processing and wastewater recycling process to ensure easy access to appropriate water quality. In particular, it is important to determine rainwater and graywater criteria to combine with appropriate local processing to harvest rainwater / graywater for secondary purposes. Human activities cause chemical pollutants in the environment, usually mobilized by water. Further research on measurement, fate and impact of existing pollutants and newly emerging pollutants is necessary. This will help identify and control the risks of pollutants to the environment and human health.