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Recycling of Casts as an Adsorbent for Phosphorous Removal

The technology of removing phosphorous, considered as one of the most important control nutrients causing eutrophication in various water bodies, have been investigated by many researchers. In this study, casts which can be obtained from the vermicomposting of mixing sewage sludge and cow manure, were used as an adsorbent, and their effects of several physical/chemical factors on the efficiencies of phosphorous adsorption were examined by batch tests. Generally, it could be showed that the efficiencies of phosphorous adsorption were very influenced by cast dosage, temperature and agitation speed. If we reflected the adsorption capacity(k) and adsorption intensity(1/n) of Freundlich isotherm, we couldn't consider casts as a good adsorbent for removing phosphorous. But, because casts were relatively excellent in cation exchange, in point of waste recycling, we could know that they were capable of removing phosphorous. The SEM observation revealed that the evident variations were hardly seen, but particle sizes of cast were relatively bigger and showed forms of smaller plate than before.