Treatment of Surfactant Phosphate and Nano – Silver in Laundry Detergent Solution by Adsorption Process of Filter Layer

Abstract

The effective prevention and mitigation of water pollution and ecological degradation from eutrophication was the minimization of organic substance and N and P nutrients to the standard set out before discharging into bodies of water. Particularly, discharging the laundry wastewater directly into public water resource had widely effects on aquatic environment. The objectives of this research was to treat surfactant, phosphate and nano-silver in laundry wastewater by using adsorbents such as lignite fly ash (LFA), waterworks sludge (WWS) and chitosan (CS) from shrimp shell. The batch experiments were performed in laundry detergent solution (LDS) (35 g/60 L of water) to determine the removal efficiency of COD, phosphate and nano-silver. The results revealed that COD, phosphate and nano-silver were removed by LFA (91.30, 70.25 and 82.61% respectively), WWS (56.52, 66.67 and 82.61% respectively) and CS (65.22, 68.82 and 91.30% respectively). For column treatment, which was designed in 5 treatments: 1^st column consist of 5 filter layers (stone, gravel, mixed LFA with coarse sand 1:40, mixed WWS with coarse sand 1:40 and chitosan 1g) 2^nd column consist of 4 filter layers (stone, mixed WWS with coarse sand 1:40, gravel and chitosan 1g)
3^rd column consist of 4 filter layers (stone, mixed LFA  with coarse sand 1:40, gravel and chitosan 1g) 4^th column consist of 3 filter layers (stone, spherical ceramic fly ash and chitosan 1g) and 5^th column consist of 3 filter layers (stone, spherical ceramic WWS and chitosan 1g). In each treatment time of 5 columns with using 250 mL of LDS, the experimental results showed that the highest removal efficiency of COD (>67%), phosphate (>76%) and nano-silver (>50%) could be achieved from the 4^th column by effluent was agree with the water quality of the standard. Moreover, the 4^th column had a long duration time than the other column. Furthermore, the 5^th column was the 2^nd of a good removal efficiency but had a short time to use than the 4^th column. Therefore, this research could be applied to set a expanded scale filter tank for available support a large amount of laundry wastewater.