Treatment Of Synthetic Wastewater By A Pilot-scale Aerobically Moving Bed Biofilm Reactor

Aimed at a pilot-scale moving bed bioreactor (MBBR) used to treat domestic wastewater,the startup strategy and its operating parameters as well as the rule of biomass growth werefirstly investigated in this thesis. Secondly, the key factors affecting the treatment efficiency ofMBBR were involved. Finally, a kinetic model for MBBR system was established. The mainobject was to provide useful information for MBBR application in the field of wastewatertreatment. The main results were as follows.1. The MBBR was started up with and without adding inoculate sludge respectively. TheMBBR could be rapidly started up within two weeks. The final biofilm concentration was 1.2g/Lfor the former and 1.0g/L for the other.2. With the increase of the biofilm concentration, the OUR of the biomass was decreased.While the COD removal rate obtained the maximum with 47mgCOD/gVSS·h when the biofilmconcentration was 17.0-18.0gVSS/m2.3. The aeration and COD concentration in influent had great effect on the biofilmdevelopment. In general, the optimum aeration was 3.0m3/h with the ratio of air to water 10:1.4. Under the aeration of 3.5m3/h, HRT of 4h and the temperature of about 18℃, the CODremoval in the MBBR system was the highest.5. The treatment efficiency of two-stage MBBR was better than that of one-stage MBBR.The COD and NH3-N removal were 90% and 40% respectively for two-stage MBBR, but theywere 82% and 10% for one-stage MBBR system.6. The yield of sludge in MBBR was 0.12-0.23gSS/gCOD, which was lower than thetraditional activated sludge process. It showed that the biofilm development in MBBR washelpful for the reduction of sludge.7. The kinetic model of substrate degradation in MBBR used to treat the domesticwastewater was established as follows:...