Research On The Application Characteristics Of Different Fillers In Bilolgical Contact Oxidation And Proce Improvement

The shortage of water and water pollution situation is very severe in our country. At present, importance has been attached to sewage treatment and measures have been taken as well in many big cities. Because there is no sewage treatment facilities in many small towns, a large amount of domestic sewage, industrial hydrated without treatment has been poored directly into the nearest body of water, which has caused serious pollution of local water, so in order to achieve the sustainable development of man and nature, sewage of small towns must be treated effectively before emission.Biological Contact Oxidation can also be called the "submerged bio-filter ".Filler provides place for the growth and reproduction of microb.Immersed in water, covered with biofilm,filler maks sewage and biofilm contacted . The metabolism of microb on the biofilm is to remove organic pollutants in wastewater, and consequently purify the sewage.Filler is the core of contact oxidation, and the performance of filler has a direct impact on effects of water treatment.Fillers used now are required to be with large surface area, porosity, durability ,great biological stability, low price and the other. The start-up of reactor and attaching biofilm on filler was compared in the study. Better start-up mode and attaching method was chosen to conduct experiments. The method of activated sludge inoculation reached removal requirements firstly, followed by a method of start-up with bacteria,which add in a large amount of bacteria through bacilli at the start-up period. Natural enrichment culture method was the longest. Up to 36 days, COD removal rate reached 62.14%. Good conditions were provided for the following experiments.The characteristics of the filler were studied , including the adsorption of different fillers and the impact of water on the experimental conditions. 3 # filler had the best adsorption characteristics and operating effects in the reactor was also the best, because the surface of 3 # filler was rough, which was beneficial for the growth of attaching micro-organisms. The porosity of 3 # was larger , providing ample space for microbial growth,with lager biomass on the filler surface. It is helpful to compare the best type of filler and evaluate the key factors on the goodness and badness of filler through the above experiments , and then conduct the experiment further, to select the best filler and the best way to start the reactor,and study the removal of pollutants .Improvements were made to the process. Based on the original reactor, the aeration bio-contact oxidation was improved into two aerated bio-contact oxidation. Two aerated bio-contact oxidation achieved a functional area and bio-phase classification. Dominant species cultured in a segment were heterotrophic microorganisms, mainly for the removal of COD; the main advantages of cultured bacteria in B section were autotrophic microorganisms, mainly for removal of ammonia and further removal of organic contaminants, which made two aerated bio-contact oxidation method obtain stable and good water quality.