Installation and commissioning of Shenzhen Hongjie water production pure water equipment, ultra pure water equipment, softened water equipment and other water treatment system projects

The hardness of water is mainly composed of cations: calcium (Ca2 +) and magnesium (Mg2 +) ions. When the raw water containing hardness ions passes through the resin layer of the exchanger, the calcium and magnesium ions in the water are replaced with the sodium ions in the resin. The resin adsorbs the calcium and magnesium ions, and the sodium ions enter the water. In this way, the water flowing out of the exchanger is the softened water with the hardness ions removed.

1. Product structure

Imported control valve: the valve body is made of high-strength light corrosion-resistant engineering plastic and lead-free brass.

Anti corrosion tank body: the tank body is made of FRP (carbon steel or stainless steel lined plastic tank body can be selected), which is anti-corrosion, pressure resistant and long service life.

Uniform water distribution system: jet water distribution is adopted, the effective exchange capacity of resin can be brought into full play, and the salt control is accurate without salt pump.

Imported high-performance resin: strong acid cation exchange resin is selected, with low damage rate and uniform particle size, so as to improve the ion exchange rate.

2. Product features

High efficiency: the overall design of the softened water device is reasonable, so that the effective working exchange capacity of the resin can be brought into full play.

Labor saving: high degree of automation, no need to assign special personnel on duty.

Water saving: the water production rate of softened water device is more than 98%.

Power saving: the siphon regeneration principle is adopted, no salt pump is required, and the power consumption is only equivalent to 1% of the manual water softening equipment.

Small floor space: only the floor space of resin tank and salt tank needs to be provided to save the space occupied by pipeline and salt pump.

Convenient adjustment: the user can adjust the regeneration cycle and regeneration time according to the actual needs.

Low operation cost: due to the high degree of automation, the water softener can adapt to the change of water volume, accurately measure the volume of water production and the amount of regenerant, avoid the waste of regenerant during regeneration, and save a lot of labor costs.

3. Operation process

function:

Under a certain pressure (0.2-0.6mpa) and flow rate, the raw water enters the container (resin tank) equipped with ion exchange resin through the valve cavity of the controller. The Na + contained in the resin is exchanged with the cations (Ca2 +, Mg2 +, Fe2 +, etc.) in the water, so that the Ca2 + and Mg2 + ion content in the outlet water of the container can meet the established requirements and realize the softening of hard water.

Backwashing:

After resin failure, backwash with water from bottom to top before regeneration. There are two purposes of backwashing. One is to loosen the compressed resin layer during operation through backwashing, which is conducive to the full contact between resin particles and regeneration liquid; The second is to discharge the suspended solids and broken resin accumulated on the resin surface with the backwashing water, so that the water flow resistance of the exchanger will not be greater and greater.

Regenerated salt absorption:

Regenerate once every 24 hours for 2 hours. Under certain concentration and flow rate, the salt solution for regeneration flows through the failed resin layer to restore its original exchange capacity.

Slow washing:

After the regeneration liquid is fed, there is still salt liquid in the exchanger that has not participated in the regeneration exchange. Clean it with clean water less than or equal to the flow rate of the regeneration liquid (slow cleaning) to make full use of the regeneration effect of the salt liquid and reduce the load of washing.

Quick cleaning (washing):

The purpose is to remove the residual regeneration waste liquid in the resin layer. It is usually cleaned at normal flow rate until the water is qualified.

Regenerant tank water injection:

Inject the solution into the regenerant tank to regenerate the required amount of salt water for one time.

4. Calculation method of salt consumption and salt concentration

Generally speaking, it can be calculated as follows: resin amount (L) * 160 = salt amount (g), and the concentration of soft water salt NaCl regeneration solution is 5-12%; If the amount of resin is 10L, it is generally 10 * 160 = 1600g per regeneration, i.e. 1.6kg. This needs to be based on the requirements of inlet hardness and outlet water quality.

The simple calculation method of resin regeneration salt consumption is as follows:

NaCl regeneration solution concentration 5-12%;

The concentration of salt solution is determined by the proportion of the water flow injected into the ejector to the amount of saturated salt solution sucked in. Generally, the concentration of salt solution is between 5-12%. The higher the inlet pressure is, the higher the concentration after mixing is. Setting parameters generally: 10 minutes of back suction, 30-50 minutes of regeneration and 10-20 minutes of water injection (salt bucket with float control). You can make small changes on the basis of the above parameters.

The amount of regeneration liquid is 2-3 times of the filling volume of resin;

That is, salt is required per liter of resin:

Minimum salt consumption: 2 times of concentration x 5% = 100g

Maximum salt consumption: 3 times x concentration 8% = 240g

Take the intermediate value: twice the concentration x 8% = 160g

The salt consumption of 1l resin for countercurrent regeneration is about 80-160g, and the salt consumption of 1l resin for downstream regeneration is about 160-240g. The current automatic control valve has fewer downstream regeneration faults and higher salt consumption. When adding salt to the salt tank, pay attention to the use of large salt, because there is a gap between the large salt particles for salt dissolution, while the fine salt will slow down if it does not dissolve, and always ensure that the salt particles are higher than the salt water level, that is, there is no salt and no water, so as to ensure that it is a saturated salt solution. Oppose the saying that "as long as there is undissolved salt in the salt bucket".

5. Resin replacement cycle

Resin replacement time generally ranges from several months to one year, which is mainly related to raw water quality (raw water hardness), resin quality, water consumption (equipment use) and other factors. Whether the resin needs to be replaced mainly depends on the strength, exchange capacity and regeneration capacity of the resin. For example, if the strength of the resin is broken to more than 40%, it must be replaced; If the resin exchange capacity decreases by 30%, it must be replaced.