A Study On General Treatment Technology And Start-Up Of Full-Scale Plant Of Alcoholic Wastewater

Nowadays it is one of the difficult problems in our country and abroad wastewater treatment fields, that how to treat the alcoholic mill wastewater economically and efficiently. The alcoholic wastewater treatment project in alcohol factory of Xinxiang City was studied in this paper. The process technics and characteristics of alcoholic wastewater were simply discussed, and the theory and technology of anaerobic fermentation, the Upflow Blanket Filter (UBF) reactor, the Cyclic Activated Sludge System (CASS) technology were simply analysed through quantities of literature. A high efficiency and low cost technics route was explored which can steadily run and bring considerable economic profits. The technical parameters of the entire engineering were mentioned and which was successfully started-up at last. The paper mainly studied the start-up performance of the full-scale UBF reactors treating high strength alcoholic wastes, and established an influent model on organic loads and space loads, and found out the model parameters fit for alcoholic wastewater. At the same time the paper also investigated the change of the activated sludge concentration, the forming of the granular sludge, the influence of the feed's PH, and the effect of the padding inside the UBF reactors, moreover analyzed the economic problems. The experimental results demonstrated:1. After solid-liquid separating through board frame percolators, the high strength alcoholic wastes could be treated effectively by UBF+CASS. It was a high efficiency and low consumption way of technology. The total removal rate exceeded 99%, which could notably reduce the quantity of organic waste in effluent. With it substituting for conventional technology would be very promising.2. Effective pretreatment was necessary to treating alcoholic effluent by biochemical technology. Because it could almost eliminate all the Suspended Solids in the wastewater and therefore reduce the difficulty of the posterior treatment process which was very important to keep the steady of the anaerobic system. Furthermore considerable economic profits can be produced.3. Inoculated with aerobic sludge that its concentration was 20kgSS/m3, the UBF reactors also formed granular sludge through long domestication and cultivation. The diameter ofthe granular sludge was below 1 .0mm and its vigor was the same as the anaerobic sludge.4. Quantity and quality of inoculating sludge was very important to the start-up of anaerobic system. Considerable anaerobic digestive sludge inoculated in the UBF reactors were washed out by waterpower load in early start-up. lOkgSS/ anaerobic sludge was an appropriate quantity to UBF reactors treating alcoholic wastes.5. Basing on the connection of the organism degradation and cellular compose in the UBF, an influent model on organic loads Mn=(1+k)n-1M1 and space loads Nn=(1+k)n-1N1 were established. And the right parameter k was determined as 0.03 which should be reliable.6. Basing on the growth character of the bacteria and feeds loading model inside the UBF, a scheme of the influent was designed.7. The full-scale UBF reactors were triumphantly started-up according to the feed loading model and scheme, and the granular sludge came into being in all reactors. The result of the start-up indicated that the model was correct and the scheme was reliable.8. The acidity of the alcoholic wastewater was very high, but the UBF reactors were still favorably started-up under the circumstances of the influent without putting any antalkali. The PH of the reactors was smaller than that practically determined, and along with the height, the PH was increased at first and then reduced.9. The granular sludge in UBF was black and spherical, with smooth edge and high density.