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Type of water source: Brackish water (Brackish water refers to water whose alkalinity is greater than hardness, contains a large amount of neutral salt, and has a pH value greater than 7.)
Brackish water is mainly characterized by a bitter taste and is difficult to drink directly. Long-term drinking can lead to gastrointestinal disorders and low immunity. my country's brackish water is mainly distributed in the northern and eastern coastal areas.
The hazards of brackish water are mainly manifested in: the chemical type of brackish water is mainly chloride type or sulfate chloride type, which is completely unsuitable for human and livestock drinking and agricultural production needs. According to a sampling survey conducted by the city’s health and epidemic prevention department, the incidence of intestinal infection is 1.45 times per person per year, which is 38 percentage points higher than that in other regions. What’s more serious is that the incidence of children in brackish water areas is higher than that in other regions. 60 percent. Drinking brackish water for a long time has seriously endangered the health of the masses and affected the social stability and the development of the rural economy.
In daily life, when the chloride exceeds the normal range (national standard 250mg/L), it is brackish water. There are many methods for desalination of brackish water, mainly distillation, electrodialysis and reverse osmosis. Reverse osmosis is used for treatment, which is a water treatment technology developed in recent years, especially for the treatment of chlorides in water. The desalination of brackish water is actually the desalination of salt water, so that the salt water is desalinated or treated to meet the drinking water standard.
Conventional process flow:
The pretreatment system can adopt coarse filtration, activated carbon adsorption, fine filtration, etc. The composite membrane is very sensitive to free chlorine in the water, so the pretreatment system is usually equipped with activated carbon adsorption. Fine filtration is established to protect the reverse osmosis membrane and prolong its service life, so it is essential.
System advantages: no phase change, normal temperature operation, simple equipment, high efficiency, less land occupation, convenient operation, less energy consumption, wide adaptability, high degree of automation and good water quality.
