According to the guidelines for the use of activated carbon in water treatment in thermal power plants, we know that fruit shell activated carbon is the main type of activated carbon used in water treatment in thermal power plants. Among the numerous shell activated carbons, coconut shell activated carbon is the preferred choice. Compared to other shell activated carbons, coconut shell activated carbon has good adsorption and high strength.
Physical performance indicators of activated carbon for water treatment in thermal power plants. The physical performance indicators of activated carbon for water treatment in thermal power plants should meet the requirements.
1. Activated carbon indicators
Intensity ≥ 90% (used before ion exchange); ≥ 95 (used before reverse osmosis)
Iodine adsorption value ≥ 900mg/g
Particle size mesh (mm) 10-28 (1.651-0.589)
Apparent density 0.38-0.50g/cm
Floating loss <5%
Moisture content ≤ 10%
pH 5.5～11.0
Ash content ≤ 6%
2. Height of activated carbon filter layer
The loading height h of the activated carbon filter for adsorbing organic matter in water shall not be less than 2m, and the operating cycle shall not be less than 2160h; the loading height h of the activated carbon filter for removing residual chlorine in water shall not be less than 1.5m, and the operating cycle shall not be less than 7000h.
3. Treatment of activated carbon before use
After loading the activated carbon in the activated carbon filter, backwash it with clean water (filter effluent) until the effluent becomes clear, and then discharge the water to a surface of 10cm to 15cm on the carbon layer. After soaking in 3% to 5% industrial hydrochloric acid for 12 to 24 hours, the waste acid solution is discharged, and the water is washed with an activated carbon filter until the alkalinity of the inlet and outlet water is equal. The activated carbon filter located after the cation exchanger is washed forward until the hardness difference between the inlet and outlet water is less than 2 μ mol/L.
4. Inlet and outlet water quality and operation monitoring
Inlet water quality: turbidity less than 5NTU;
Operation monitoring: Monitor the concentration of organic matter (or residual chlorine) in the inlet and outlet water of the activated carbon filter 1-2 times a week.
5. Methods and precautions for adding activated carbon
When adding activated carbon, the first thing to ensure is that the amount added is appropriate. The size of the dosage is related to the characteristics of the water source, the level of water pollution, and the treatment objectives, and should be accurately calculated under the guidance of professionals.
Secondly, the method of addition should be carried out according to the process requirements. Common methods include bottom addition, top spraying, static addition, dynamic addition, etc. During this process, attention should also be paid to the uniformity of the carbon particles and subsequent processes.
https://www.naturecarbon.com/wood-based-activated-carbon/wood-based-powdered-activated-carbon.html
