The effect of the natural bentonite to reduce COD in palm oil mill effluent by using a hybrid adsorption-flotation method

International Technical Postgraduate Conference

Dewi, Ratni^1 ; Sari, Ratna^1 ; Syafruddin^1

Department of Chemical Engineering, Lhokseumawe State of Polytechnic, Indonesia^1

关键词: Activated adsorbents;    Adsorption columns;    Adsorption materials;    Adsorption process;    Condensate waters;    Flotation process;    Natural bentonite;    Palm oil mill effluents;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/210/1/012016/pdf
DOI  :  10.1088/1757-899X/210/1/012016

来源: IOP

【 摘 要 】

Palm oil mill effluent is waste produced from palm oil processing activities. This waste are comingfrom condensate water, process water and hydrocyclone water. The high levels of contaminants in the palm oil mill effluent causes the waste becomes inappropriate to be discharged to water body before processing, one of the most major contaminants in wastewater is fats, oils and COD.This study investigated the effectiveness of chemically activated bentonite that serves as an alternative to reduce the COD in adsorption and floatation based palm oil effluent waste processing. Natural bentonite was activated by using nitrit acid and benzene. In the existing adsorption material to improve COD reduction capability whereas the flotation method was used to further remove residual effluent which is still remain after the adsorption process. An adsorption columns which operated in batch was used in the present study. By varying the circulation time and adsorbent treatment (activated and non-activated), it was shown that percentage of COD reduction reached 75% at the circulation time of 180 minutes for non activated adsorbent. On the other hand the percentof COD reduction in adsorption and flotation process using activated bentonite reached as high as 88% and 93% at the circulation time of 180 minutes.