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Two different cutting-oils from H and B companies which are sold as an eco-friendly cutting-oils were selected and the biodegradability of these commercially available cutting-oils was evaluated by the sequencing batch reactor (SBR) processes. The cutting-oil wastes (H1) pre-treated by coagulation/flocculation was used as an influent to SBR. When the F/M ratio was operated 0.04 to 0.08kgCOD/kgMLSSㆍd, removals of BOD5 and CODCr were above 97% and 91%, respectively. T-N and T-P removals were above 76% and 81%, respectively. If the diluted cutting-oil wastes (B1) was used as an influent of the SBR, CODCr removals were above 77% at the F/M ratio of 0.01-0.02kgCOD/kgMLSSㆍd. After the cutting-oil wastes was treated by coagulation/ flocculation (B2), CODCr removals was above 85%. If the pre-treated cutting-oil wastes were mixed with a synthetic wastewater (B3) and fed into the SBR in order to mimic the real wastewater treatment plant situation, BOD5 and CODCr removals were above 97%, 91%, respectively. T-N and T-P removals were above 79% and 76%. The ratio between BOD5 and CODCr, (CODCr-BOD5)/CODCr, indicating the biodegradability of effluent of the SBR, was calculated to 85% and 61%. This means that significant amounts of non-readily-biodegradable organic compounds in the effluent of H1, B3 are still present.

Evaluation of biological treatment of cutting-oil wastes using sequencing batch reactor (SBR) process