Dissertation > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization

The Study on Organic Matter Removal Degradation and Dynamic Model in Humified Media Filter

Author WangJuan
Tutor WuJun;ZhengJianZhong
School Nanjing University
Course Environmental Engineering
Keywords Humic media filter Microstructure Permeability coefficient Organic matter degradation characteristics Kinetic model
CLC X703
Type Master's thesis
Year 2011
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The humic packing the biofilter (Humified media Filter, namely the HF process) in humic filler to build, the range between the the inorganic sand filter and the biofilter new wastewater treatment technology. The HF process has been put into rural sewage distributed processing engineering applications, but in the actual operation of the process, the total nitrogen removal rate is not high, and covers an area of ??large problem still exists. To solve the above problem, the system of organic matter degradation behavior characteristics of a study to understand the nature of humic filler surface, combined with the difference of the mechanical properties of humic filler macro water preliminary exploration of the combined evaluation system the humic filler macro and micro indicators establish combined organic matter removal of of various humic packing biofilter, the biological populations within the system, and the difference of the total biomass, analysis of humic filler biofilter COD degradation characteristics. Lay the foundation for the to build the humic packing biofilter theory system run by humic media filter and attached to the growth of a completely mixed system, the establishment of a kinetic model of humic packing biofilter services in the the system filler modified and process optimization, improve process performance. Humic packing biofilter organic degradation behavior research from the filler microstructure, macroscopic the water mechanical properties investigated, COD degradation characteristics of humic filler biological filter dynamics model to establish four parts to expand. The main findings are as follows: (1) observation of the four filler scanning electron micrographs rough surface of the sand and coal and to a lesser extent, mainly composed of particulate matter; peat and humic garbage tables and rough constitute a similar way, are reunited structure of the main body of the three-dimensional space. X-ray photoelectron spectroscopy (XPS) analysis of the filler found four types of filler have the presence of elements such as Si, C, O and V;, humic garbage K elements on the surface of Al, Zn, sand, coal surface surface is the presence of Zn, K. Four types of filler performs Fourier transform infrared spectroscopy, and found that four filler surface hydroxyl group-containing class, the presence of a vinyl-based compound, have an Si-O-Si group of; peat and coal may also contain aliphatic class and five-membered ring heterocyclic compound having two double bonds. The four filler than the order of the size of the surface area for peat gt; humic garbage gt; Coal gt; river sand, cation exchange capacity in the order of humic garbage gt; peat gt; Coal gt; riversand. (2) under the conditions of the water and analog sewage, each filter is saturated hydraulic permeability coefficient of the size of the order are peat gt; humic garbage gt; river sand gt; coal. Under clear water conditions, the permeability coefficient of the biofilter, water becomes dropped significantly after the analog sewage, except coal the biofilter hydraulic permeability coefficient is still considerable. (3) combined with of various humic packing biofilter organic removal efficiency of biological populations and biomass differences, analysis of the characteristics of the biofilter degradation of organic matter. The dilution plate coating method isolated microorganisms play a major role in the biofilter total of three, the number of colonies of each system are different, but the same kind of. The three humic filler biofilter influent concentration of organic matter for organics removal efficiency of 500mg / L and 1000mg / L, are ideal. Humic peat build the filler in the the three humic packing biofilter biofilter organic matter than the degradation rate of the smallest, and thus microorganisms than the minimum growth rate of microbial growth and oxidation tends to be most vulnerable to the dynamic equilibrium, the corresponding saturated hydraulic permeability coefficient filter clogging the most difficult and most conducive to the humic packing biofilter long-term stable operation that peat is an excellent biological media. (4) the use of peat as a processing structures in peat concentration of 10g / L of complete mixing system, according to the Monod mode calculated half rate constant KS = 178.6mg / L, the maximum degradation rate Vmax = 1.29 × 10-4d-1 combined removal efficiency under different COD concentration of the trickling filter system, eventually to the establishment of of peat humic filler biofilter dynamics model: Se / So = exp (-2.04 × 10-9C / F), and verified through experiments.

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