overview

The distribution range of fluoride containing groundwater in rural areas of China is very wide. Long term consumption of water with high fluoride content can cause chronic poisoning, especially serious harm to teeth and bones. Mild cases of dental fluorosis can manifest as enamel damage, premature tooth loss, and other symptoms. Severe cases can cause bone and joint pain, even bone deformation, hunchback, and complete loss of labor ability. So the harm of high fluoride water is serious. The standard for drinking water in our country stipulates that the fluoride content shall not exceed 1mg/L.

Fluoride is widely present in nature. The fluoride content in natural water is generally between 0.3~0.5mg/L. The groundwater flowing through fluorine-containing ore layers can sometimes reach up to 2-5 mg/L.

Consuming a certain amount of fluoride daily from food and water is beneficial for preventing dental caries. Long term excessive intake of fluoride may lead to chronic poisoning. Mild cases may develop dental plaque and joint pain, while severe cases may experience bone development and loss of labor. The use of reverse osmosis (RO) membrane equipment may contain excessive fluoride, which directly affects the service life of the RO membrane. According to China's "Drinking Water Standards", the fluoride content in water is less than 1.0 mg/L.

At present, adsorption filtration is commonly used for defluorination. When the raw water flows through the defluoriner and the core filter layer inside the defluoriner - natural mineral filter material, the water comes into contact with the natural mineral filter material in the defluoriner and defluoriner. Through physical and chemical reactions - adsorption, fluorine is adsorbed on the surface of the adsorbent, generating insoluble fluoride, so that the fluoride content in the water reaches within 1.0 mg/L as specified in the national drinking water hygiene standard (GB5749-2006). When the defluorination ability drops to a certain limit (saturation), the adsorbent's defluorination ability is restored through regeneration with a rejuvenator.

The defluorination equipment consists of a defluorination tank, filter material, regeneration device, pipeline valves, etc. Different sizes of equipment can be selected according to different fluoride content and treatment water volume. The size of the defluoriner depends on the water volume and can be made of steel or fiberglass depending on the purpose. The defluorination device has a fixed bed and a fluidized bed. The water flow in a fixed bed is generally upflow, with a filter layer thickness of 1.1-1.5m and a filtration rate of 3-6m/h. The thickness of the moving bed filter layer is 1.8-2.4m, and the filtration rate is 10-12m/h

Principles and Process Flow

Fluorine containing water passes through a fluoride removal filter material adsorption filtration layer with a larger specific surface area.When the pH is within the range of 5-8, the fluoride removal effect is better, while the adsorption capacity is the highest at pH 5.5. In China, the pH is mostly controlled between 6.5 and 7.0, and the contact time of the fluoride removal device should be at least 15 minutes.Fluoride ions in water are adsorbed to form insoluble fluorides, which are then removed. The reaction equation is: R2SO4+2F -=R2F2+SO42- after the adsorbent fails,When the fluoride content in the effluent exceeds the standard, the operating cycle ends and regeneration is required. During regeneration, the filter column is first backwashed for 10-15 minutes with an expansion rate of 30-50% to remove suspended solids from the filter layer.

Use a rejuvenator solution for regeneration to restore its adsorption capacity. The ratio of its dosage to defluorination is 60:1, with a regeneration concentration of 1% -2%. After cleaning, defluorination water can be used for rinsing for 8-10 minutes. When the pH value of the raw water is greater than 7, carbon dioxide gas is generally used for adjustment.The concentration and dosage of the regeneration solution should be tested, usually using Al₂（SO₄）₂When regenerating, it is 1-2%, and when using NaOH, it is 1.0%. After regeneration, backwash with defluorinated water for 8-10 minutes, and the regeneration time is about 1.0-1.5 hours. When using NaOH solution, the regenerated filter layer is alkaline and needs to be converted back to acidic in order to remove F^-Ions and other anions.

process characteristics

1、Environmentally friendly fluorine removal filter material with high fluorine removal capacity and safe use;

2Low operating costs and low water production costs;

3Easy to operate equipment: Automated and semi automated operation without adjusting pH value;

4The equipment is easy to install and use. It can be directly connected to the variable frequency pump in the deep well, and the water from the equipment can enter the pipe network directly, without the need for a raw water tank and an outlet water tank, and without the need for secondary pressurization;

5The water utilization rate of the new fluoride removal equipment is high, exceeding 98-99%;

6The equipment occupies a small area.

7The effluent quality indicators comply with the requirements of the "Sanitary Standards for Drinking Water Quality" (2006).

8The filter is made of high-strength stainless steel, with food grade anti-corrosion treatment inside and a thick tank wall≧3mm，

9Hourly processing water volume 0- ≥ 100m³Durable and long-lasting;

Application scope

Fluorine removal filters and iron manganese removal filters are applied in the production (domestic) water treatment of industrial and mining enterprises, rural safe drinking water and other industries. They are also used as pre-treatment equipment for ultrafiltration, nanofiltration, reverse osmosis, ion exchange, mixed bed, EDI and other equipment when the fluoride ion and iron ion content in raw water is high.

Drinking water defluorination and arsenic removal filter materials have the characteristics of strong ion exchange capacity, simple operation, easy regeneration, no agglomeration, no excessive dissolved substances, and low operating costs. They are currently the most effective, economical, and safe new defluorination and arsenic removal filter materials.

● Pre treatment of reverse osmosis, ultrafiltration, softening, mixed bed, and EDI.

Purification treatment of hot water for bathing, underground hot springs, and condensed hot water, with no reduction in exchange and adsorption capacity below 100 ℃.

3.0 Design water quality and water treatment level

Water source: self provided well water

Raw water quality: Fluorine less than 5mg/L

Inlet turbidity:<5FTU

Alkalinity: ≤ 2mg/L

Effluent quality: fluoride less than 1mg/LMeet or exceed the National Drinking Water Standard GB5749-2006

4.0 Processing principle and process flowchart

Principle: Fluorine containing water passes through a fluoride removal filter material with a larger specific surface area to adsorb and filter layers. Fluorine ions in the water are adsorbed to form insoluble fluorides, which are removed. After adsorption failure, a regeneration solution is used for regeneration to restore its adsorption capacity.

5.0 Process plan and equipment description

Adsorption and ion exchange of defluorination filtration purification device

Our company produces a fluoride removal filtration and purification device. When groundwater with a fluoride content of less than 5mg/L passes through the filtration and purification device, fluoride and fluoride are adsorbed on the surface of the active special fluoride removal filter material, generating insoluble fluoride, and making the fluoride content in the effluent ≤ 1.0mg/L, meeting the standard for drinking water.

regeneration

When the effluent reaches a certain amount, the dedicated defluorination filter material in the defluorination filtration and purification device becomes saturated due to the retention of excessive impurities and loses its exchange capacity, and must be shut down for regeneration. At this time, the effluent is provided by other tanks to ensure continuous effluent.

During regeneration, backwashing can be used for cleaning to remove suspended solids and other impurities that may be intercepted. At the same time, the active special fluorine removal filter material should be loosened, and then the liquid medicine should be introduced from the top of the tank. The regenerated waste liquid should be discharged through the drain valve. After the drug washing is completed, the final step is to perform a positive washing process to thoroughly remove the residual drug solution in the active special defluorination filter layer.

Technical Parameter

Working mode: pressure based;

Operation mode: Water flow from bottom to top, in series or parallel

Filter particle size: 0.5-2.5mm

Filtration rate: 2-6m/h (the larger the pH value and filter diameter of the filter material, the lower the filtration rate),

Operating cycle: Depending on the quality of the raw water, the minimum duration should not be less than 8 hours

Backwashing method: water washing, or a combination of air and water backwashing

Backwash time: 10-15 minutes

Backwash water consumption: 1-3%

Backwash strength: 18-25l/sm2

Backwash expansion rate: 30-50%

Regeneration solution: 1% -2% sodium hydroxide solution

Regeneration time: 1-2 hours,

Regeneration strength: 8-10L/m2s

Washing time: 8-10 minutes

7Equipment advantages:

01 Stable defluorination performance

Add fluoride removal filter material based on the fluoride content of the raw water to ensure that the fluoride content in the effluent remains stable at 0.5-1.0mg/L.

02 Short regeneration time

HAP-FThe technology is based on the fluoride concentration of the raw water and removes fluoride through the use of fluoride removal filter media. There is no need for regeneration during the fluoride removal process, ensuring the long-term use of the fluoride removal equipment.

03 Safe effluent quality

The effluent quality is stable during the defluorination process, and there is no problem of declining defluorination ability.

04 Low processing cost

The direct operating cost for removing 1.0mg/L of fluoride is approximately 0.3 yuan per ton of water.

05 PLCSimple control, operation, management, and maintenance

Fully automatic operation is achieved through PLC control system, improving the reliability and maintainability of the system, and making it easy to operate.

Company Profile:

Shijiazhuang Jieao Environmental Protection Equipment Co., Ltd., with a registered capital of 11.8 million yuan, has a hygiene license for water related products in Hebei Province, a testing report from the Hebei Health Testing Center, a product record from the Hebei Quality Supervision and Inspection Bureau, and has passed ISO9001 quality system certification, 14000 environmental system certification, occupational health system certification. It is also a member of the Hebei Small and Medium Enterprises Association.

Phone: Zhao Binjie