Abstract

Palm oil mill effluent (POME) has high chemical oxygen demand (COD), thus requires effective treatments to environmentally benign levels before discharge. In this study, immobilized microalgae cells are used for removing pollutants in treated palm oil mill effluent (TPOME). Different ratios of microalgae beads to TPOME concentration were examined at 1:2.5, 1:5, and 1:10. The biomass concentration and COD removal were measured through a standard method. The color of the cultivated microalgae beads changed from light green to darker green after the POME treatment for 9 days, hence demonstrating that microalgae cells were successfully grown inside the beads with pH up to 9.84. The immobilized cells cultivated in the POME at 1:10 achieved a higher biomass concentration of 1.268 g/L and a COD removal percentage of 72% than other treatment ratios. The increment of the ratio of microalgae cells beads to POME concentration did not cause any improvement in COD removal efficiency. This was due to the inhibitory effect of self-shading resulting in the slow growth rate of microalgae cells which responsible for low COD removal. Therefore, this system could be a viable technology for simultaneous biomass production and POME treatment. This will contribute to research efforts toward the development of new and improved technologies in treating POME.

抽象的

棕榈油厂废水（POME）具有很高的化学需氧量（COD），因此在排放前需要对环境有益水平进行有效处理。在这项研究中，固定的微藻细胞用于去除处理过的棕榈油厂废水（TPOME）中的污染物。以1：2.5、1：5和1:10检查了微藻珠与TPOME浓度的不同比例。通过标准方法测量生物质浓度和COD去除。经过POME处理9天后，培养的微藻珠的颜色从浅绿色变为深绿色，因此表明微藻细胞已成功在pH高达9.84的珠内生长。与其他处理比例相比，在POME中以1:10培养的固定化细胞实现了更高的生物质浓度1.268 g / L和COD去除率72％。微藻细胞珠粒与POME浓度之比的增加并未导致COD去除效率的任何提高。这是由于自遮蔽的抑制作用导致了导致藻类细胞COD去除率较低的微藻细胞的缓慢生长。因此，该系统可能是同时进行生物质生产和POME处理的可行技术。这将有助于研究工作，以开发治疗POME的新技术和改进技术。该系统可能是同时进行生物质生产和POME处理的可行技术。这将有助于研究工作，以开发治疗POME的新技术和改进技术。该系统可能是同时进行生物质生产和POME处理的可行技术。这将有助于研究工作，以开发治疗POME的新技术和改进技术。