Different research show aloe properties for flocculation in water treatment.
In different researches, the results indicate that aloe has excellent flocculation effects, and the removal ratio of turbidity is 99.08%, when the optimal dosage of aloe gel is used.
The influence of different factors on flocculation effect of aloe gel were studied.
One research –Study on the Natural Macromolecular Flocculant of Aloe– demonstrated that aloe gel has an extensive applicable pH range, the removal ratio of turbidity reach up to 92% when the pH of water sample is between 3 and 11, and the flocculation effect of aloe to high turbidity sample is better than to low turbidity sample.
Compared with Fe_2(SO_4)_3, PFS and PAM, the results indicate that aloe has a good flocculation effect, with characteristics of low dosage, high sedimentation velocity of flocs, thick floes.
Compounded with Fe_2(SO_4)_3, PFS and PAM separately, the results indicate that aloe compounded with Fe_2(SO_4)_3 has the best effect, the removal ratio of turbidity is 99.12%, the optimum dosage of aloe is 1.68mg/L, and that of Fe_2(SO_4)_3 is 20mg/L.
Practical application of aloe was studied preliminarily, and the waste water of the YouYi River in Nanjing University of Science and Technology was treated. The results indicate that aloe has a good effect to the turbidity removal,and COD is also decreased.
Other research –Flocculant effect of Aloe vera L. in removing pollutants from raw and treated dye industry effluent– demonstrated the good results of aloe. While the effluents from dye industry are the most polluting of all industrial effluents, the use of aloe vera remarkably reduced the TDS, COD, BOD and chloride in all effluent concentrations of both raw and treated dye industry effluent.
In conclusion, the biological treatment seems to be the most reliable method for the disposal of pollutants in many industries.
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