Application of in drinking water treatment
Modified activated alumina was used as an efficient method to remove trace phosphorus from water. A12 (SO4) 3 or Na2SO4 were modified and used to simulate the adsorption phosphorus removal of phosphorus containing drinking water (PO) with 4-P content of 200 (g / L). The results show that its adsorption performance is effectively improved by the modification of A12 (SO4) 3 or Na2SO4. When the dosage is 20mg / L, the phosphorus adsorption rates of unmodified activated alumina, A12 (SO4) 3 and Na2SO4 are 46.05%, 64.58% and 60.39% respectively. It is found that the adsorption of modified phosphorus is mainly physical adsorption. With the increase of temperature and pH value, the phosphorus removal effect shows a downward trend. Turbidity in water has a great influence on the effect of adsorption phosphorus removal. Activated alumina can be used for deep phosphorus removal of filtered drinking water. The effects of seven common filter materials (coal columnar carbon, activated zeolite, ceramsite, coconut shell carbon, quartz sand, biological shale ceramsite and quartz sea sand) and activated alumina on the mass concentration of DTP (dissolved total phosphorus) were compared when pH value was 7, filtration rate was 8m / h and continuous filtration time was 3H μ The mass concentration of g / L simulated water sample and particulate total phosphorus (PP) is 50 μ The adsorption of phosphorus in g / L simulated water sample shows that it has obvious removal effect on DTP when the thickness of filter material is the same, the particle size range is the same, pH value and filtration rate are the same
The average removal rate of DTP was 82.19%. The removal effect of PP and turbidity is similar, and there is no advantage in the removal of PP and turbidity. An adsorption bed with a daily treatment capacity of 500m3 was built with 19.8t alumina for the water of a fish pond, so that the phosphorus content was reduced from 0.5 mg / L to 0.05 mg / L, and the filtration rate was improved
1 ~ 2 m / h. The unit has operated continuously for 900D without regenerating the adsorbent, and can still meet the design effluent requirements. They also plan to scale up the treatment unit to reduce the phosphorus content of a 116000m3 lake water from 0.16mg/l to less than 0.03mg/l.