《Table 2 Primary indices of the extracted two kinds of waste water samples》

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《环保性碱液强化萃取剂处理高含酚量的焦化废水（英文）》

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As demonstrated in Table 2，the extracted residual ammonia water as the primary waste water sample for the comparative test is cumbersome.There is an obvious increase of sewage oil content（SOC）in the extracted residual ammonia water.Moreover，contrast to the distilled ammonia waste water，the residual ammonia water needed more acid for the pretreatment before the extraction，which was not convenient.Furthermore，the extracted residual ammonia water contained the oil film of the acid tar oil and precipitation ammonium salt.As shown in Fig.1，that it is advised to choose distilled ammonia waste water as test sample for comparative test of alkali-enhanced extraction and regenerative extraction.Four experimental control groups with modified extractants were prepared in comparison to the earlier test groups containing original BQ complex extractant.Twenty beakers of the distilled ammonia waste water were processed by the same pretreatment procedure as mentioned above.Detailed information about the concentration and volume ratio is important for preparation of modified extractant.