Studies On Rapid Start-up Of UASB Reactor And Wastewater Treatment Technology On High Concentration Organic Materials By Improved UASB Reactor

Focusing on the defects of long start-up period and low organic loading rate of UASB (Upflow Anaerobic Sludge Blanket) reactor, the effects of adding GAC (Granular Activated Charcoal) and PAC ( Powdered Activated Charcoal ), PAC which pre-filmed by aeration, installating of pre-exhausted apparatus and scutate fibrous filler on the start-up and performance of UASB reactor were studied in this paper. The parameters such as start-up period, organic loading rate, organic removing rate, operating stability, characteristics of sludge in UASB reactor were implored in detail. The mechanisms were also analyzed. The main results are as follows:1. The start-up period of UASB reactor could be shorten by 1/3 for the adding of PAC with the size of 0.16~0.2 mm. It also improved the organic loading rate and the activity of sludge 60% and 50% respectively. The operating stability was also promoted greatly. While the adding GAC with the size of 0.27~0.40 mm had no obvious effect on the start-up of UASB reactor. The major reason was probably the granular size bigger than the PAC. The driving force generated by air flow and water flow was so small that it could not make them act as the secondary nucleus.2. The pre-filmed treatment by aeration on PAC could improve the process of sludge granulated in the UASB reactor. The start-up period could be shorten to 49 d from 57 d. It also had obvious effect on the improving of volume loading rate and sludge activity in early stage, but in later, it did not so obvious. There was no signs showed that it affected the yield of methane.3. Installating pre-exhausted apparatus to UASB reactor could twice the volume loading rate of UASB reactor with enough operating stability. The probably reason was that the reactor' structure could help to hold massive activated sludge in the sludge bed. While it was not suitable to wash out some flocculating sludge which could delay the process of sludge granulated.4. Installating scutate fibrous filler could improve the volume loading rate of UASB reactor by more than 30%. The organic removing rate was high in early stage, but dropped in the later stage. The reason might be the percolating ability of the filler decreased by conglomeration. It also showed the ability to resist shock loading was low.5. In the two months, the activated sludge from the oxidation ditch could be tamed as seed sludge in the UASB reactor. It also could be cultivated anaerobic granular sludge which was excellent in activity and settlement. It revealed the possibility using the activated sludge to cultivate anaerobic granular sludge.