Study On The Biodegradation Of Dye Wastewater And The Treatment Techniques

Dye manufacturing wastewater and textile effluent possess great proportion in the industrial wastewater. It is difficult to be treated because of its complicated component, high concentration and difficulty capability of degradation. It has important meaning and wider prospects to the development of environment protection and dyestuff and the correlate industry to study the method of dyeing wastewater treatment and put forward an effective project.In this paper, to improve the biodegradation, the effective method of dye manufacturing wastewater treatment is discussed, which aims to the characteristics of dye manufacturing wastewater. It can help us estimate the degradation degree by microorganism and the biodegradation by determine the biodegradation respiration graph. The infection on the biodegradation by uncultured activated sludge and cultured activated sludge in different degrees is studied. The results indicated: (1) the biodegradation degree of dye manufacturing wastewater is low, so it is pivotal to change the biodegradation; (2)increase the culturing time to sludge will improve the biodegradation of dye manufacturing wastewater and the endure capacity of organic load; (3)the settling to determine the biodegradation respiration graph is simple and speedy,effective and intuitive, the traditional BOD₅/COD ratio is replaced by DO, the compare of the biodegradation respiration graph and the endogenous respiration graph is the estimation of the biodegradation.On the base of research of the biodegradation, we investigate the biological treatment of the dye manufacturing wastewater by the numbers, and make a settling named Upflow Anaerobic Sludge Blanket (UASB). The settling is used in the simulated service test of the dye manufacturing wastewater. The results indicated: (1)residence time and volume loading has great infection on the clearance of COD, when the flux of inflow is 0.95 to 1.05 L/h, the volume loading is 0.5 Kg COD/(m³.d), the best residence time is 40h. It is propitious to improve the clearance of COD by augmenting the residence time; (2)experiments on the effect of pH show that it will interfere with biological decomposition when pH of wastewater is too low or too high. In the condition of this experiment, if we control the pH between 6.0 and 9.0, it will be betterfor the bacteria in sludge to metabolize; ?temperature can also affect COD clearance, when the water temperature is 33 to 38 °C, the clearance of COD is the best. The result of this test tallies to the formula of the infection on the reaction rate of the temperature; ?the infection on the clearance of COD by five kinds of adsorbent (activated char, loess resim diatom earth> cinder and bentonite) and flocculation also be studied. The results disclose that the wastewater can be purified better when adsorbent are used when it is treated by the adsorbent. On the test condition, the clearance rate of COD is between 28.63 to 44.35%. Of all the kinds of adsorbent that are elected, the activated char is the best. But the clearance of COD by the flocculation is not distinct. It indicates that the remains in the treated wastewater exist in conditions of minor dissolved molecules after biological treatment, which are very difficult to be removed by flocculation.A project which aims to dye manufacturing wastewater treatment is put forward on the basis of results above, and used to treat the mixed wastewater in certain dye plant. On the condition of parameter by optimizing choice, by the treatment of treatment unit of UASB-anaerobic-aerobic-adsorb, the total clearance of COD can be 89.8%. If we increase the culturing time of sludge, the clearance rate of COD will increase obviously. The treatment unit also applied in Lingshanwei Sewage Treatment Plant in Jiaonan, and run with its biological treatment. The results indicate that the techniques are predominant than its present techniques. The elevated clearance rate of each contamination is: COD 12.06%, BOD5 9.60%, SS 3.09%, color 13.44%. Because the UASB is used in the system, the techniques we select obtain good infection. The biodegradation degree of wastewater increases by culturing sludge. The design and application of UASB reactor provide an effective approach to dye manufacturing wastewater treatment.