Process description

1Mechanical filter

It is mainly used to remove impurities such as rust, sediment, algae and suspended solids from water, reduce water turbidity and make the turbidity of the effluent less than0.5NTU,CODMNLess than1.5mg/LThe iron content is less than0.05mg/L,SDI≤5. Backwashing and forward washing can be carried out at any time through the control valve to wash away the dirt on its surface, prevent clogging and restore its filtering capacity.

2Activated carbon filter

Activated carbon has extremely strong adsorption and filtration performance and can effectively adsorb residual chlorine, discoloration, odor, organic matter and other substances in water. As reverse osmosis membranes are highly sensitive to residual chlorine and organic matter, activated carbon is configured to adsorb residual chlorine and organic matter, ensuring that the effluent contains residual chlorine≤0.1mg/L,SDI≤4Meet the feed water requirements of reverse osmosis membranes. Backwashing can be carried out at any time by controlling the valve to wash away the dirt on its surface, prevent clogging and restore its processing capacity.

3Scale inhibition device (softener

A fewmg/LThe scale inhibitor can prevent hundredsmg/LCalcium carbonate precipitates out. The mechanism of action is that the long-chain anions generated by the scale inhibitor in water are prone to adsorb onto the tiny calcium carbonate grains, and at the same time, these anions are easy to react withCO32¬-Ion displacement,This displacement occurs throughout the entire layer of calcium ions dispersed in water,This thus prevents the precipitation of calcium carbonate. It adopts the American Mitonro metering pump for automatic dosing, ensuring accurate metering and reliable dosing. The dosage of the medicine is approximately3PPM.

At present, scale inhibition devices are mostly used in pure water systems because they are more reliable than softeners and have lower operating costs.

4Security filter

After pretreatment, a security filter is installed before the high-pressure pump to prevent impurity particles and other substances from entering the high-pressure pump and damaging the high-pressure pump and reverse osmosis membrane. Adopt the type that is loose on the outside and tight on the insidePPThe filter element (with a frame and good strength) filters water from the outside to the inside, which can extend the time when the filter element is clogged. The upper part is equipped with an exhaust valve, which can prevent air from entering the pump and damaging it. The lower part is equipped with a drain valve, which can discharge the retained impurities at any time.

5Ultrafiltration device

Ultrafiltration technology is currently a very mature desalination technology and also a widely applied water treatment process with a broad range of uses in the market. It can precisely filter out viruses, metal ions, salts and various carcinogens in water. It features low working pressure, large water production, high desalination rate and is easy to maintain. Designing an automatic flushing device can extend its service life.

Ultrafiltration equipment and membrane applications

Ultrafiltration membranes are a type of membrane filtration that lies between microfiltration and nanofiltration. They are a membrane separation technology suitable for the separation, concentration and purification of substances. In practical applications, it is generally characterized by the molecular weight cut-off, and is mainly used to separate macromolecules, colloids and particles in the solution from small molecules such as solvents. Macromolecules, colloids and particles are retained on the membrane surface and carried away by the circulating flow of substances to form concentrated liquid, achieving the purpose of substance separation, concentration and purification. The application fields of ultrafiltration devices mainly involve beverages, biomedicine, fine chemicals, industrial wastewater treatment and reuse, etc.

Ultrafiltration membrane technology

In China, ultrafiltration technology has taken a dominant position in the clarification process of fruit juice. The freshly squeezed juice contains various substances that cause the juice to become cloudy, such as pectin, pulp debris, starch, protein, solid suspended matter, and microbial metabolism.

Ultrafiltration can be used to clarify fruit juice, allowing small molecules such as sugars, organic acids and water to pass through the membrane while retaining most of the large molecules, resulting in clear and sterile fruit juice. The ultrafiltration process does not require filter AIDS. The process is short and the labor cost is low. It is a relatively economical and effective method for clarifying fruit juice.

Enzyme preparations produced industrially generally need to be separated and purified. Traditional methods such as vacuum evaporation and solvent extraction have many drawbacks.

Nowadays, ultrafiltration technology is adopted for the separation and concentration of enzyme preparations, which can be operated at room temperature, overcoming the influence of heat on the quality of fermentation preparations. Remove the small-molecule impurities to ensure the purity and good quality of the filtrate. The filtration process involves no phase change, and both energy consumption and cost are lower than those of traditional methods. The equipment is easy to operate and control, and thus has quickly become a preferred choice for separation and concentration processes in industries such as biopharmaceuticals.

Requirements for the external environment of the ultrapure water equipment system:

1Inlet pipe: The inlet pipe is connected to the inlet of the raw water tank.

2For cable supply: According to the calculated capacity, the user will respectively supply power to the operation control electrical control cabinet.

3Outlet pipe: The pure water usage point at the outlet of the pure water tank. (For details, please refer to the process flow chart.)

4Concentrated water treatment: Wastewater discharge pool (considered by the user).

5System water temperature: Normal temperature.

6Foundation requirements: The diameter of the filter should be greater than1000mmThe foundation requires reinforcement.