Study On Anaerobic Baffled Reactor For Treating Desizing Wastewater

As the development of weave industry, it's destroy of environment is badly. Treating desizing water becomes a problem in the textile industry wastewater, because it has a little water and much contamination. Because the anaerobic baffled reactor (ABR) has some advantages in treating organic wastewater, the study on ABR for treating high strength desizing wastewater was conducted in this work. Some aspects were analyzed: starting-up an anaerobic baffled reactor, working on the efficiency by some parameters through orthogonal experiment at the steady-going time, analyzing the makeup of sludge, static removing of PVA (polyvinyl alcohol )and the process ,and the dynamics model of ABR treating desizing wastewater.(1) Study on ABR treating simulative desizing wastewater, the stable COD removal rate is above 45% at medium temperature(32-34℃), the up-flow velocity is 8m/h, the hydraulic retention time is 6 day and the volume load is 1.80 kgCOD/(m³Â·d). SS,VSS and SS/VSS is larger and larger from 1^#to 4^# of ABR. The sludge in front compartments is made of acidogenic bacterium and the sludge in back compartments is made of methanogenic bacteria. The separating of all kinds of microbe is marked. The pH fluctuates greatly at early days of the start-up, so the control of pH is an important key of the start-up. Volatile Fat Acid (VFA) concentration in each compartment becomes identical. The B/C of the wastewater through the ABR becomes high, so it proves that ABR for treating desizing wastewater beforehand is doable.(2) At the steady-going time, the influence for the remove ratio of COD is: circumfluence flux> pH of inpouring water> alkalinity of inpouring water> inpouring flux. The pH of inpouring water and circumfluence flux influence the remove ratio of COD markedly when the marked levelαis 0.01. The influence for the remove ratio of PVA is: pH of inpouring water> inpouring flux> circumfluence flux> alkalinity of inpouring water. While the marked levelαis 0.05, pH of inpouring water influence the remove ratio of COD markedly.By the double guideline intuitionistic analyse, the optimization project comes into being: pH of inpouring water 7.0, alkalinity of inpouring water 1000mg/L, circumfluence flux 1.25L/min and inpouring flux 8.0ml/min. The remove ratio of COD and PVA is 33.466% and 32.697%. The better project is that: pH of inpouring water 7.0, alkalinity of inpouring water 500mg/L, circumfluence flux 1.25L/min and inpouring flux 8.0ml/min. The remove ratio of COD and PVA is 38.269%% and 30.890%%. By validating the projects, the difference of experiment and analyse is weeny.(3) The sludge in four compartments of ABR is granular. there are filaceous bacteria and bacilli in 1 part, and it didn't come into being preponderant bacterium group; In 2 part, we found some bacilli and a few cocci, and bacterium groups are complex; Cocci and bacilli are preponderant clearly in 3^# part, bacteria got together, and there are methanogenic bacteria; In 4^# part, there are many bacilli and spirality filaceous bacteria, and preponderant bacterium group is obvious. The PVA breaks down and becomes other substance, so the COD becomes low. But PVA doesn't breaks down completely and becomes CH₄ and CO₂ by the anaerobic sludge. The amylum goes against the breaking down of PVA. While pH is between 5.5-8.0, the remove ratio of PVA is become up first and down then. The best remove ratio is 58.4% when pH is 6.5. When the alkalinity is between 500 to 2000mg/L, it's infection for removal efficiency of PVA is imperceptibly. The result of infrared scan indicates: some new kinds of substances come into being. There are numerous scarboxylic acid substances and a few aether substances produced in the system, maybe also aldehyde or ketone of carbonylic.(4) By Monod model and substance conservation elements, the dynamics model of ABR treating desizing wastewater comes about: (?) Using the experiment datum, we can getμ_max=0.075d^-1,K_s=13.2g/L.