By Coagulation-uasb-sbr Combined Process Of Chemical Paste Cleaning Wastewater Pilot Study

The performances of laboratory simulation the chemistry adhesive cleaning wastewater which came from a factory in shanghai in biochemical treatment and treatment methodology of this wastewater were studied for solving the question of engineering project in fact.The chemistry adhesive cleaning wastewater and the desizing wastewater are difficult to solve because their removal of organic substance. There are two main kinds of ingredients in the sample. They are modified starch and PVA.PVA has poor biodegradability. There are less microorganisms in nature are useful in removal of PVA. They are found in the polluted water of PVA. Solving is so difficult. Basing on the characteristic of cleaning wastewater, a three-step method to treat cleaning wastewater was proposed, that is coagulate-UASB-SBR. The results from experiments indicated that CODcr containted in the cleaning wastewater can be eliminated with the help of deposit, the waste water in biochemical treatment had changed for the better. The treatment effect can reach the secondary standards of GB8978-1996.The CODcr is a good chemistry index to analysis the effects.The result of coagulate treatment showed that the best pH was 2.0,the best coagulant were sodium sulfate 2g,boracic acid 0.3g and potassium hydroxide 3g.As a result, the removal rate of CODcr reached 70.0%,the treatment effect can not reach the secondary standards of GB8978-1996. Through the result of coagulate treatment, B/C rose from 0.28 to 0.34. The waste water in biochemical treatment had changed for the better.The key place of this article is the biochemistry method, and uses the anaerobic granular sludge to optimize UASB emphatically to enhance to the waste water handling ability and the efficiency. Using the granular sludge through the 1st reactor to take the vaccination sludge separately,and the 2nd reactor vaccination sludge inspects reactor's elimination effect for the ordinary anaerobic digestion sludge, explained that granulation of anaerobic granular sludge obviously enhances regarding the UASB stabilizing treatment cleaning wastewater's efficiency.The greatest capacity carries VLR up to 9.11kgCOD/m³·d, the removal rate of CODcr above 90%, pH is 7.5, water leakage SS is 135 mg/L, the volume of producing gases is 3.37m³/m³·d, the water leakage water quality belongs may the biochemistry good waste water. Research on the processing effect of the next treatment methodology-SBR reactor is conducted, the greatest capacity carries up to 9.6kgCOD/m3·d, the effluent CODcr concentration stabilized under 100mg/L,the effluent water quality had lowered the National Standard Level of China.In the experiment of using the anaerobic granular sludge to optimize UASB reactor, this paper studies inoculate sludge, V_up, pH, the temperature reactor, HRT and VLR load to the water leakage water quality influence. In conclusion ,the three-step method used to deal with the chemistry adhesive cleaning wastewater, show it to be feasible in technique.The paper findings use the anaerobic granular sludge in UASB reactor to raise the processing efficiency, has the theory and the practice significance.