| Textile and dyeing trade is one of the industrial departments of useing a lot of freshwater and discharging wastewater. It has the characteristic of much wastewater, complicated water quality, high concentration of organism, much difficult biodegraded matter, heaved chromadark. It belongs to industrial wastewater of difficult treatment. Because of the development of chemical fabric, rising of artificial technology and making progress of technology, which are the reasons of making a amount of the difficult biochemistry degrade of PVA serosity, artificial silk alkali solve matter and new-type auxiliary thing to enter into dyeing wastewater in recent years, and COD rises 2000-3000mg/L. It makes the removal rates of COD of the existing biological process dropped to 50% from 70%, and even lower. The traditional biological disposal process has already been challenged seriously. Therefore the production of the fabrics concerns the environment of people's life. What the fabrics and the production of fabrics should be paid close attention, and the'green fabric'of no poisoning and pollution which become of a kind mainstream of production and consumption. The research shows that traditional SBR is of advantages for simple procedure, low cost, having no sludge refluence device, heavy gradient of organism concentration, heavy reacting impetus, having no sludge expand. The intermissive running must be made some equipment in state of waiting the opportune momenting, therefore the unused rate of equipment is relatively high, energy consumption is great. The dyeing wastewater was regarded as the research object in this experiment. With the purpose of the furthest increasing the oxygen used ratio, disposal efficiency, saving resource and fund. On the basis of design of traditional SBR, this experiment refered to the design-idea of the AB technics and biological embrane method, we had found a kind of more high-efficient SBR, and what is more, we had confirmed the best parameter of every reactor. We could draw following conclusion: (1) The strengthen actived sludge with the special structure of biological iron sludge was formed when the right amount of Fe(OH)3 was added during the process of taming the sludge. The concentration of sludge rised 2-3g/L, COD removal efficiency rised 10%-20% in these conditions. (2)This experiment design had broken the drawback of low efficiency of traditional and mixed biology disposal method, which improved the effluent quality. (3) Hydrolysis acidificated-pool must to be set up as original disposal facility in the front of the whole process, which had fourfold functions of regulating water quality, water quantity, hydrolysis acidification and digesting sludge. (4)During the process of using traditional SBR to dispose dyeing wastewater, according to the change of COD and ORP, we could draw conclusions: The organism was degraded in fast speed at the beginning of the whole process. Utilization of oxygen was relatively heavy, but with the process of reaction, apt disposal organism had been degraded, the microorganism was in the'dormancy'state, COD changed slowly in this course, ORP rised rapidly, which caused the waste of resources. Aiming to the situation, this test was divided traditional SBR into AB compound process of SBR and MSBR, which was regarded as the subject part of the whole disposal test. (5)This compound process drew lessons from the design characteristic of section A loads efficiency high and section B loads efficiency low of AB process. Section A adopted the general active sludge process to train, After taming further, section B came to train a kind of the microorganism of adapting to difficult degrade organism, and then improving the efficiency of reacting. (6) The effluent wastewater of hydrolysis acidificated-pool entered into section A pool directly. This section adopted nonlimit exposed method, which prevented from sludge to be poisonned because the concentration of initial organism is too high. Fully utilizing microorganism in the original sewage, and breeding constantly. It formed an open biodynamics system, which had accelerated organic pollution to be wiped off. The sludge load was 0.6-0.7kgCOD/ (kgMLSS·d). The stay-time of wastewater was short (generally about 3.5h), the sludge age is short too (2-3d). (7)Section B adopted embrane SBR process. This process is that traditional SBR combined with contact oxidize process, and there was a small amount of biomembrane by taking active charcoal as a free state. The concentration of the microorganism was 2-3 times higher than in traditional SBR, food chain long, live time long, resist strike load strong. Therefore it adopted instantaneous inflow to enter into section B from section A. The part wastewater was the difficult degrade organism. The reaction speed was relatively slow, oxygen utilization ratio was relatively low, therefore few expositions could meet the response demand, and saving the energy, reducing the disposal cost.
|
PDF Full Text Request