| The widespread source and its own characteristics of the Molasses alcohol wastewater decide the necessity of its governance. Among the many management methods, the anaerobic biological method not only reduce the pollution but also generate a certain amount of energy-biogas, getting certain economic benefits. So its on of the most widely used method at present.Molasses alcohol wastewater normarlly contains high quantity of SO42- which can restrain the production of the biogas. This paper analyzed the desulfurization effect of the physical, chemical and biological treatment of molasses alcohol wastewater and the influence on the biogas production performance.For the physical and chemical treatment method, the processing time is fast, this paper uses the activated carbon, BaCl2·2H2O, Ca(OH)2 and iron carbon micro cell to pretreat the molasses alcohol wastewater and research the change of the SO42- and COD. Results showed that:added 8.0 g activated carbon in 500.0 g molasses alcohol wastewater, the sulfate removal rate reachs 80% and the gas production performance best which can reach 437.3 ml·g-1 VS. According to the content of S element and BaSO4 molecules, in the 500 g molasses alcohol wastewater added 70% of BaCl2·2H2O can removes all the sulfuric acid root, the cumulative production rate can reach 483.2 ml·g-1VS which is the relatively best. In the same way, added 70% of Ca(OH)2 can removes all the sulfuric acid root, the cumulative production rate can reach 436.6 ml·g-1VS. Using the Iron carbon micro cell method to handle the molasses alcohol wastewater Can effectively suppress the influence of sulfate and improve the wastewater can be biochemical, the cumulative production rate can reach 451.0 ml·g-1 VS.But the physical and chemical treatment method has its own shortcomings:First the activated carbon adsorption is not only the aulfuric acid root but also the COD in wastewater and trace elements. The BaCl2·2H2O, Ca(OH)2 precipitate the sulfuric acid root directly, but it will also introduce new ions which has a potential impact on anaerobic fermentation. The speed of the Iron carbon micro cell reaction is quickly, but should control the iron carbon additive ratio and reaction time strictly. Therefore, based on the physical and chemical processing method, the disadvantages of its own and then explores the molasses alcohol wastewater biological desulfurization process, dicided into the constant temperature of desulphurization and continuous desulphurization.For the constant temperature batch type biological desulfurization. The removal rate of COD was 36.1%, SO42- removal rate can reach 77.7%; The experimental group of the accumulative gas production rate is 317.4 ml·g-1VS compared with the control group of the accumulative gas production 293.1 ml·g-1VS have no obvious improvement. But from the gas composition, The H2S content of experimental group is lower than the control group. But its processing cycle is long and the prosessing wastewater quantity is not large.For continuous biological desulfurization in flow control in 1～8ml/min, The SO42-removal rate have no obvious change, Only in a small range fluctuations; In 10 ml/min due to high COD volume load of anaerobic acidification of desulfurization system, The SO42- removal rate declines linearly. The preservation of the COD increases with the increase of traffic state of preservation. Control flow under 8 ml/min, The preservation condition of COD can be up to 84.6%, at the same time, the removal of SO42- can reach 91.4% which is the best treatment effect. For the constant temperature instructions for continuous biological treatment of molasses alcohol wastewater by anaerobic fermentation. The cumulative gas production rate reaches 442.4 ml·g-1VS; Although the continuous anaerobic biological treatment for the continuous fermentation of molasses alcohol wastewater gas production rate only 407 ml·g-1VS, But it could dispose the large quantity of wastewater. |
PDF Full Text Request