The wastewater generated in swine farm and semiconductor manufacturing industry contain high strength of ammonium-nitrogen and phosphate, which could be used as nutrient-fertilizers. In order to recovery NH4+-N and PO43--P from the wastewater, struvite precipitation was applied. The result showed th...
The wastewater generated in swine farm and semiconductor manufacturing industry contain high strength of ammonium-nitrogen and phosphate, which could be used as nutrient-fertilizers. In order to recovery NH4+-N and PO43--P from the wastewater, struvite precipitation was applied. The result showed that the removal range of NH4+-N and PO43--P was 70-75 % and 65-85 % at optimum conditions, respectively. The precipitated matters were sampled and analyzed by XRD. The X-ray diffractograms were exhibited several peaks indicative of the struvite presence. To evaluate the struvite as a fertilizer, a set of pot trial tests were conducted with commercial fertilizers, i.e., complex, organic and compost fertilizers by cultivating lettuce and Chinese cabbage. The cultivation results indicate that struvite was superior to commercial fertilizers in growing lettuce. However, in cultivating Chinese cabbage, the fertilizer capacity of struvite was less than that of complex fertilizer. Also, it was observed that the amount of heavy metals, such as Cd, Cu, As, Hg, Pb, Cr6+, Zn, and Ni, contained in lettuce and Chinese cabbage, which was cultivated by struvite, was not higher compared to them cultivated by commercial fertilizers. In test for determination of optimum dosage of struvite in cultivating lettuce and Chinese cabbage, as the dosage of struvite increased, the biomass of lettuce and Chinese cabbage tended to increase. Lab-scale column test also showed that struvite has slow-release property even though the release rate of ammonium ion from struvite was faster than complex fertilizer. The thermal heating of recovered struvite not only caused breaking down of crystal structure, but also suppression of growing lettuce and Chinese cabbage. Consequently, it was revealed that struvite obtained from swine and semiconductor wastewater was effective as a fertilizer in cultivating lettuce and Chinese cabbage.
The wastewater generated in swine farm and semiconductor manufacturing industry contain high strength of ammonium-nitrogen and phosphate, which could be used as nutrient-fertilizers. In order to recovery NH4+-N and PO43--P from the wastewater, struvite precipitation was applied. The result showed that the removal range of NH4+-N and PO43--P was 70-75 % and 65-85 % at optimum conditions, respectively. The precipitated matters were sampled and analyzed by XRD. The X-ray diffractograms were exhibited several peaks indicative of the struvite presence. To evaluate the struvite as a fertilizer, a set of pot trial tests were conducted with commercial fertilizers, i.e., complex, organic and compost fertilizers by cultivating lettuce and Chinese cabbage. The cultivation results indicate that struvite was superior to commercial fertilizers in growing lettuce. However, in cultivating Chinese cabbage, the fertilizer capacity of struvite was less than that of complex fertilizer. Also, it was observed that the amount of heavy metals, such as Cd, Cu, As, Hg, Pb, Cr6+, Zn, and Ni, contained in lettuce and Chinese cabbage, which was cultivated by struvite, was not higher compared to them cultivated by commercial fertilizers. In test for determination of optimum dosage of struvite in cultivating lettuce and Chinese cabbage, as the dosage of struvite increased, the biomass of lettuce and Chinese cabbage tended to increase. Lab-scale column test also showed that struvite has slow-release property even though the release rate of ammonium ion from struvite was faster than complex fertilizer. The thermal heating of recovered struvite not only caused breaking down of crystal structure, but also suppression of growing lettuce and Chinese cabbage. Consequently, it was revealed that struvite obtained from swine and semiconductor wastewater was effective as a fertilizer in cultivating lettuce and Chinese cabbage.
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