Study on efficiency of refractory linear alkyl-benzene sulfonates(LAS) removal from synthetic detergent wastewater by novel up-flow biological aerated filter
To improve the efficiency of up-flow biological aerated filter, fixed bio-cord in clarifying region was proposed and the novel system named NUBAF was applied on laboratory scale. Through study the effects of hydraulic loading, ratio of air to liquid, pollution load, media height and DO on linear alkyl-benzene sulfonates (LAS) treatment performance using this new process and the results indicated that the hydraulic loading, ratio of air to liquid and media height were the main factors to the NUBAF performance, but the effect of the pollution load on the NUBAF performance was unremarkable. The removal efficiency of LAS could be up to 80 % under the optimal conditions:the hydraulic loading of 1.1 m3/ (m2·h), ratio of air to liquid of 3∶[KG-*3]1~4∶[KG-*3]1 (based on 3.3 m3/ (m2·h):1.1 m3/ (m2·h)), besides, there was an exponential relationship between the concentration of LAS and media height expressed as Ch=C0ekh. After treated by NUBAF, effluent was greatly improved to reach the discharge standards of China.