Restaurant Waste-water Treatment Using Moving Bed Biofilm Reactor

As the restaurant wastewater which contains much fiber, protein and fat residues has induced the deteriation and waste of natural water, much attention has been paid to the problem. To alleviate the load of the urban sewage system, and promote the development of reclaimed water reuse in water-scare regions, the paper used a moving bed biofilm reactor (MBBR) to carry out laboratory-scale experimental studies aiming at the wastewater in school canteen whose waste water features on relative consenration, large emission and the stabilization of water quality. The paper also explored the effective treatment and recycling of catering waste water reuse technology process which laid the foundation in theoretral and experimental basis on the development and spread of the reclaimed water reuse technology in China.During the process of the MBBR experimental research, we took the concentration of COD, ammonia nitrogen (NH3-N), total phosphorus (TP) at the inflow and outflow as the main objectives of inspection, carried out the effect evaluation experiment of the operating conditions. Besides, an effluent deep treatment has been operated. The relationships between the biochemical degradation process and operating conditions have been analyzed by combining with the kinetic theory. Finally the best conditions of the system operation process have been summed up:1. It was appropriate to use the hollow ball and bio-ball as the carriers when treating wastewater by using the combination of the moving bed biological filter anaerobic-anoxic-aerobic sewage treatment system, as it can not only complete the growth of biofilm quickly and easily, but also obtain good effects.2. The aeration quantity and hydraulic retention time (HRT) played a decisive impact on the removal efficiency of pollutants (COD, NH3-N and TP) in many impact factors. The removal rates of the pollutants significantly improved with the increase of aeration quantity when the aeration quantity was less than0.4m3·h-1, and the removal efficiency of the pollutants were inhibited when the aeration quantity was more than0.4m3·h-1, especially the removal rate of TP. The removal rate of TP deteriorated significantly with the extension of treatment time. Similarly, the removal rates of pollutants significantly improved with the increase of HRT when the HRT was less than7.5h, and then the removal rate of TP deteriorated significantly when the HRT was more than7.5h.3. The pH, reflux ratio and the temperature had little effects on COD removal rate, but had significant effects on the removal rate of NH3-N and TP. The NH3-N and TP removal rate significantly improved when the temperature rose from15℃to30℃It was favorable to remove NH3-N at pH>7, and it would be inhibited to remove NH3-N at pH<7.4. The MBBR technology possessed stronger resist impact load capability about organic pollutants5. The effluent met the aesthetic environment use standard in reclaimed water quality of municipal wastewater for scenic environment use, made the reclaimed water reuse come true.