Treatment Of Dyeing Wastewater Using Moving Bed Biofilm Reactor Process

Dying wastewater charactered by intense colour, high organic pollution load and exterme variable and recalcitrant nature is a kind of typical non-biodegradation wasterwater.The dissertation mainly studies the efficiency and mechanism of A/O MBBR(Moving Biological Bed Reactor) process reactor for Dyeing wastewater treatment, aiming at searching for an effective biological treatment method and lowing costs of treatment,.The influence of temperature,hydraulic retention time (HRT) and organic loading rate (OLR) on the purification performance of MBBR by using Acid Red B as target degradation product were observed to obtain the optimal parameters. The results showed that the optimal condition in Aerobic MBBR process was OLR 4.2kgCOD/(m3·d), HRT 8h and temperature of influent 30℃, while in anaerobic process MBBR reactor the optimal parameters were OLR 0.35kgCOD/(m3·d), HRT 30h and the temperature of influent 35℃.The experimental treatment of dying wastwater using modified bio-carrier was studied. Two kinds of methods, chemical oxidation-surface covered with iron ion and chemical oxidation-surface grafting of gelatin, were used to modify the surface perporty of bio-carrier, and the improvement of surface properties of bio-carrier was characterized by contact angle, scanning electron microscope and X-ray photoelectron spectroscopy, respectively. Denaturing gradient gel electronphoresis (DGGE) analysis were also conducted to gain microbial species in biofilm formed on the modified bio-carrier surface.To further improve the treatment efficiency of MBBR, strain L10 that has chracterristics of high decolorization and degradation for acid red B was selected from the aerobic MBBR under laboratory conditions.The strain was identified as Lysinibacillus fusiformis (same alias Bacillus fusiformis), Finally, through intermittent operation of the moving bed biofilm reactor, the biochemical dynamics of industrial wastewater anaerobic treatment was investigated and the new kinetic model was built:S=(S0-Sn)exp(-K2Xt)＋Sn.