Polishing of POME by Chlorella sp. in suspended and immobilized system

International Conference on Chemical and Bioprocess Engineering

地球科学;化学;生物科学

Lahin, F.A.^1 ; Sarbatly, R.^1 ; Suali, E.^1

Faculty of Engineering, Universiti Malaysia Sabah, Sabah, Kota Kinabalu

88400, Malaysia^1

关键词: Biochemical oxygen demands (BOD);    BIofilm reactors;    Immobilized microalgae;    Light penetration;    Membrane filtrations;    Nitrogen and phosphorus;    Separation methods;    Suspended growth systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/36/1/012030/pdf
DOI  :  10.1088/1755-1315/36/1/012030

学科分类：生物科学（综合）

来源: IOP

【 摘 要 】

The effect of using suspended and immobilized growth of Chlorella sp. to treat POME was studied. Cotton and nylon ropes were used as the immobilization material in a rotating microalgae biofilm reactor. The result showed that POME treated in suspended growth system was able to remove 81.9% and 55.5% of the total nitrogen (TN) and total phosphorus (TP) respectively. Whereas the immobilized system showed lower removal of 77.22% and 53.02% for TN and TP. Lower performance of immobilized microalgae is due to the limited light penetration and supply of CO2inside the immobilization materials. The rotating microalgae biofilm reactor was able to reduce the biochemical oxygen demand (BOD) to 90 mg/L and chemical oxygen demand (COD) to 720 mg/L. Higher BOD and COD reading were obtained in suspended growth due to the presence of small number of microalgae cell in the samples. This study shows that suspended growth system is able to remove higher percentages of nitrogen and phosphorus. However, an efficient separation method such as membrane filtration is required to harvest the cultivated microalgae cell to avoid organic matter release into water bodies.