Effect of Surfactant on Degradation of Polycyclic Aromatic Hydrocarbons (pahs) in Thermophilic Anaerobic Co-Digestion of Sludge from Kim-Ngưu River and Organic Waste

Abstract

Abstract: The aim of this study was evaluate the effect of nonionic surfactant (Tween 80) on degradability of PAH compounds in thermophilic anaerobic co-digestion of sludge from Kim Nguu river and organic waste. The simulation on laboratory scale was use for testing with 3/1 ratio of organic waste and sludge. During experiment, the concentration of PAHs was measured by GC FID method and its variation was paid more attention to evaluate its degradability.

The results showed that removal efficiency of 2-3 rings, 4 rings, 5 rings, 6 rings and total PAHs compounds in the case of (Sludge + Organic waste) were 65.34%, 47.93%, 35.43%, 21.35% and 22.83% respectively. The degradability of 2-3 rings compounds was higher over two times than the 5 rings compounds and three times than the 6 rings compounds.

When using nonionic surfactant agent (Tween 80) with 0.5 g/l of concentration, the rate and degradability of PAHs compounds increased significantly except 4 rings of PAHs which had not identified in the influent of (SL + OW + Tween 80). Degradability of 2-3 rings PAHs compounds increased from 65.34% to 83.98%, 5 rings compounds increased from 35.43% to 53.71%, 6 rings compounds increased from 21.35% to 67.06% and total PAHs increased from 22.83% to 67.22%.  

This result is basic for implement to study deeply enhancing degradability of PAHs compounds in the sludge of Kim Nguu river to remove them from initial substrate in effort applying end product for agricultural soil.