Zhu Hong, Chen Ji-hua
School of Environmental Science and Engineering, Donghua University, Shanghai, PR China.
J Hazard Mater. 2005 Dec 9;127(1-3):221-7. doi: 10.1016/j.jhazmat.2005.07.022. Epub 2005 Aug 29.
In this paper, a new wastewater treatment process has been presented to minimize excess biomass production in which both excess sludge digestion and wastewater treatment are conducted simultaneously in the system. The process is modification of conventional activated sludge process with insertion of two facultative basins in the sludge return line. The excess biomass in the aeration tank is recirculated to the first facultative tank. It was observed that: (1) The amount of excess biomass is reduced to nearly aero when 5.95 g/day excess sludge is recirculated from the aeration tank to the first facultative tank at COD(Cr) loading of 2.31 kg/m(3)day. A biomass experiment of 1000 mg/L was maintained at 2.31 kg-COD(Cr)/m(3)day without drawing excess sludge for 6 months of experiment period. Inert organic substances did not seem to accumulate. The effluent quality has been well below the discharge limit. (2) On the basis of infrared spectroscopy proved that dye molecule in wastewater were firstly absorbed on the sludge, and then the bond energy of was gradually weakened and decomposed and eliminated lastly.
本文提出了一种新的废水处理工艺，以尽量减少剩余生物质的产生，该工艺可在系统中同时进行剩余污泥消化和废水处理。该工艺是对传统活性污泥工艺的改进，在污泥回流管中插入了两个兼性池。曝气池中的剩余生物质被再循环到第一个兼性池。观察到：（1）当在2.31 kg/m³·天的COD（Cr）负荷下，每天有5.95克剩余污泥从曝气池再循环到第一个兼性池时，剩余生物质的量减少到几乎为零。在2.31 kg-COD（Cr）/m³·天的条件下维持1000 mg/L的生物质实验，在6个月的实验期内未排出剩余污泥。惰性有机物质似乎没有积累。出水水质远低于排放限值。（2）基于红外光谱证明，废水中的染料分子首先吸附在污泥上，然后其键能逐渐减弱并分解，最终被去除。
