| An experiment was conducted to evaluate the treatability of the refractory organic substances contained in secondary sewage effluent. Synthetic secondary sewage effluent was used as a model treated wastwater which contains mainly refractory organic matters. The composition of the synthetic one was humin, tannin, lignin and Arabic gum powder as high molecular carbohydrate. Besides beef extract, pepton and lauryle sulphate was added as a portion of protein and anionic surfactants based on the composition of real secondary sewage effluent. The adsorption isotherm test of each substance was done using powdered activated carbon with nominal particle size 44 ㎛, Tannin, lauryle and beef extract were strongly adsorbable. Pepton and ligin were also good in adsorption but himin and Arabic gum showed poor adsorbaility. In the Biodegradablility test, tannin, ligin, humin and Arabis gum, which are known to be non-biodegradable, were also decomposed by microorganims during the extended period of contact. Althongh the data were fluctuated, the decomposition of such organics was occured by almost first order reaction. |
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