Research Of The Hydrolytic Sludge Character And The Hydrolysis Mechanism

According to the inquisition and the test of some local medium-sized or pilot-scale hydrolytic equipment's work condition, some equipments' actual ability differ from the designed ability obviously, because of designing being depended on the experience. For the water distributing device particularly, lacking of quantitative experiment leading( either the qualitative or the semi-quantitative), even the critic condition of qualitative result isn't quite clear and consistent by the authors, as a result, the designed device work unsteady, the problem can induce several aspects as follows:1.The relationship between power consuming of distributing device and the distributing effection.2.The relationship between the power for the distributing device and the behaviour of sludge.3.The relationship between the power for the distributing device and the biochemical process of hydrolysis.This research analyzes these relationships from the aspects of the fluid mechanics and put forward the elementary solution.Research purpose: hydrolytic device operation condition, physics processes of anaerobic sludge and the relationship between sludge physics movement and biochemical function is researched by the hydrodynamics method, in order to estimate the influence of the hydraulic loading to sludge staying and operating condition, and to carry out the quantitative resultsfor the design of up-flowing hydrolytic device. Research method:1.In continues flowing condition, the sludge inflation characteristics is researched corresponding to the different hydraulic loading by dynamics methods.2.In particular hydraulic condition, the relationship between the biochemical parameter and the hydraulic loading is researched. The experiments:1.Sludge inflation experiment under different flow rate (the influence of flow rate, flow velocity out of the water distributing device ,the distance between water distributing pipe and reactor bottom and the dynamics condition for the restarting of hydrolytic device are researched)2.The starch hydrolysis experiments in static and dynamic state (the relation between starch adsorption and hydrolysis process and hydraulic loading is researched) The results:1, Along with the increment of the current velocity, the flux drawing in increases, and flux is 4-7.7 times volume of the column.2.the flux drawing in is related with the distance from the nozzle to the bottom of the column, the distance is longer, the flux drawn into is bigger, but when the distance is 10 times nozzle diameter, because the radial speed decreases quickly, the actual function of the drawn into is not meaningful already.3.When water distributing nozzle's caliber is 1mm, Reynoldscount is ranged 4000 -7600 approximately, being onflow, having high exit velocity with scour ability. The distance between the nozzle and bottom is 40mm, agitation state is better. In the projects, the proper distance between the nozzle and bottom is very important.4.The main parameter of the fluid mechanics is Reynolds count, the basic condition of sludge dispersing Reynolds count is in onflow. When Reynolds count is larger than 5000, the sludge behavior is more stable.5.Distance between the nozzle and the bottom also is a factor to influence sludge dispersing. When sludge concentrated over 48 hours, such as in the experiment condition, the distance between the nozzle and the bottom is 40mm, can satisfying sludge dispersions. The hydrodynamics symbolizing parameter of this condition is the maximum speed along the axis, the speed at the bottom is 0. 45~0.65 m/sec.6.In static state experiments of starch hydrolysis, the process of starch concentration changing along with time means for adsorption process, the coefficient of first order reaction equation is k= ?0.0049, and the coefficient of regressionr=0.971.7.According to static and dynamic experiment data of starch hydrolysis, the author puts forward a new loading parameter, starch concentration /the volume of sludge.