Method utilizing ultrasonic to remove heavy metals (Cu, Zn, and Cd) in pig manure
A technology of heavy metals and pig manure, applied in chemical instruments and methods, applications, water/sludge/sewage treatment, etc., to achieve the effect of low cost, important social and economic significance, and easy industrial production
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example 1
[0016] Example 1: Put the configured pig manure solutions of 40g / L, 100g / L, and 200g / L into conical flasks respectively, put the conical flasks into an ultrasonic box, and ultrasonicate at a frequency of 40KHz for 30min, then filter or Centrifugal dehydration and drying to obtain pig manure from which heavy metals Cu, Zn, and Cd have been removed. It was determined that the removal rates of Cu in three different concentrations (40g / L, 100g / L, 200g / L) of pig manure solutions were 74.2%, 69.1% and 56.7%, respectively; the removal rates of Zn were 55.7%, 48.6% and 40.5%; Cd removal rates were 65.7%, 52.4% and 45.5%.
example 2
[0017] Example 2: Put the prepared 100g / L pig manure solution into conical flasks and divide them into 4 groups. Put the conical flasks into the ultrasonic box. The first group is ultrasonicated at a frequency of 5KHz for 30 minutes, and the second group is in the ultrasonic chamber. Ultrasound at a frequency of 10KHz for 30min, group 3 at a frequency of 20KHz for 30min, and group 4 at a frequency of 40KHz for 30min, then filtered or centrifugally dehydrated and dried to obtain dry pig manure from which heavy metals have been removed. It was determined that the removal rates of Cu in pig manure were 13.3%, 23.6%, 27.1% and 69.1% under the treatment of 4 different ultrasonic frequencies; the removal rates of Zn were 9.4%, 16.7%, 18.9% and 48.5% respectively. ; Cd removal rates were 11.5%, 19.7%, 24.3% and 52.4%.
example 3
[0018] Example 3: Put the prepared 100g / L pig manure solution into conical flasks and divide them into 4 groups. Put the conical flasks into the ultrasonic box. The first group is ultrasonicated at a frequency of 40KHz for 10 minutes, and the second group is in the ultrasonic chamber. Ultrasonic at 40KHz for 30min, group 3 for 60min at 40KHz, and group 4 for 90min at 40KHz, then filtered or centrifugally dehydrated and dried to obtain dry pig manure from which heavy metals have been removed. It was determined that the removal rates of Cu in pig manure were 45.1%, 69.1%, 76.9% and 87.4% under the treatment of different ultrasonic time in 4; the removal rates of Zn were 28.7%, 48.6%, 70.4% and 76.5% respectively. ; Cd removal rates were 38.6%, 62.1%, 74.3% and 85.4%.
[0019] The invention uses the dried feces retrieved from the farm as raw materials, uses ultrapure water as the solvent of pig manure, and adopts an ultrasonic method to remove heavy metals in pig manure, reducing...
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