Reduction of Nitrogen and Phosphorus Nutrient in Retention Effluent Pond from Power Plant by Adsorption and Filter Layer
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Abstract
Utilization of a voluminous industrial boiler effluent was the efficiency useful of water resources and mitigation of water pollution from eutrophication. The water quality analysis results of effluent from power plant retention pond revealed that it was rich of nitrogen nutrient (NH3-N 280.65 mgL-1, NO3- -N 292.96 mgL-1), orthophosphate 0.57 mgL-1 (higher than eutrophication critical value), high alkalinity (pH 10) and chlorophyll A 79.77 mgL-1. So it was not appropriate to reuse or discharge. This research was to investigate the adsorption and filter layers which low cost treatment and friendly to environment. From the batch experiments, it was found that a good efficiency removal of O-phosphate, ammonia and nitrate was obtained from lignite fly ash (LFA), waterworks sludge (WWS), hydrotalcide (HC) and golden apple shell ash extract (GASE). Moreover, WWS could be also decreased alkalinity. For column experiments, which was designed in 2 columns. Both of columns consist of 3 adsorption layers and 3 filter layers. From down to top layers were mixed WWS with coarse sand (1:20 by wt.), mixed stone with coarse sand, mixed HC with coarse sand (1:20 by wt.), mixed stone with coarse sand, mixed LFA with coarse sand (1:20 by wt.) for 1st column and mixed WWS with coarse sand (1:20 by wt.) for 2nd column and stone. After that, the effluent sample (ES) and the effluent sample mixed with GASE were treated by these 2 columns. All of the column treatment experiments revealed that the 2nd column gave the better removal of nitrate (>90%) and ammonia (99.63%) than the 1st column. But the 1st column gave the high phosphate removal at 100%. Finally, the expended scale adsorption and filtration layer was conducted to investigate the treatment efficiency of pH, N, P and chlorophyll A. The results showed that the treated water could be used for watering a tree. But if industries want to discharge, they must replicated treat. Therefore, this research could be applied to treat the high pH, N, P and chlorophyll A content effluent for reuse and discharge.
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References
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