The goal of a water treatment plant is to comprehensively remove various pollutants in water, including organic matter, inorganic matter, heavy metals and pathogenic microorganisms. The goal of a water filtration plant is mainly to remove suspended matter and impurities in water.

The main types of water treatment plants are: 1. Drinking water treatment plants, 2. Sewage treatment plants, 3. Industrial water treatment plants, 4. Seawater desalination plants.

Machines used in water treatment plants: 1. Water intake and pretreatment equipment 1.1 Water intake pump 1.2 Screen 1.3 Primary sedimentation tank 2. Coagulation and sedimentation equipment 2.1 Dosing device 2.2 Mixer 2.3 Flocculation tank 2.4 Sedimentation tank 3. Filtration equipment...

The initial construction cost of the Sorek Desalination Plant was about $400 million, while the construction cost of the Carlsbad Desalination Plant was as high as $1 billion. As the world's largest desalination plant, the Ras Al Desalination Plant cost as much as $7.3 billion to build.

According to the lowest and highest costs, the total cost of building a small water treatment plant is about 170,000-485,000 US dollars. If operation and maintenance costs are taken into account, the total expenditure in the first year will increase to between $270,000 and $630,000.

The prices of aluminium sulfate (alum) and polyaluminium chloride are relatively low and suitable for large-scale applications. Although polyacrylamide (PAM) has a good flocculation effect, it is more expensive and is suitable for scenarios with high requirements for flocculation effect volume.

Reverse osmosis filter is one of the most efficient water purification technologies currently, capable of removing most pollutants. Water is separated under high pressure through a semipermeable membrane, most soluble substances and organic pollutants are intercepted.

Modern water treatment plants use automated control systems to achieve automated control of each process link, including raw water pretreatment, coagulation, sedimentation, filtration, disinfection, etc. Through PLC and DCS systems, each link in the water treatment process can be automated...

According to the Indian Water Works Association (IWWA), the cost of building a medium-sized drinking water treatment plant (with a daily processing capacity of 100,000 cubic meters) is approximately between 5 billion and 7 billion Indian rupees (approximately US$67 million to US$94 million).

The workflow of a water treatment plant is generally divided into the following main stages: pretreatment, primary treatment, secondary treatment and tertiary treatment. Each stage has its specific goals and technical means.