A Study And Practice On Quantitative Theoretical Calculation For Adsorption Of Ammonium Ions By Medium

China not only has few amount water resource of per person, but also has been polluted quite badly, and behindhand water treatment facilities and low efficiency of sewage disposal. In this developing country, the important approach to solve problem of water pollution is seeking and developing a suitable innovative process which must provide multi-benefit including high efficiency, low energy, and low operational cost.In the field of wastewater treatment, energy-intensive and highly mechanized technologies are giving way to nature-based technologies that utilize solar energy and living organisms. Constructed wetland (CW) technology has played an important role in bringing about the change, meanwhile it can grant the demands to our country wastewater treatment. In CW's phosphors and nitrogen removal process, the choice of fillings is key technology, and the concentration of the one important design basis. However, most influences of removal rate by adsorption resulted in the concentration of contamination in water phase and the medium dosage were appraised by lab survey which can not solve the relation of gross equilibrium Q_e with initial solution NH₄⁺-N concentration (Co) and sorbent quantity (Wo) and determining the relevant parameters as well. So the ration of filling has great blindness and the error bringed by calculation will influence fabricative and operatational cost calculated for CW and treated quality directly. Therefore,seeking a kind of scientific quantitative way of filling has become the researchful focal point of this subject.Aiming at this subject, this paper integrated captive and dynamic test studying about vermiculite,synthetic zeolite and 732 cation exchange resin,and further verified the suitability to get rid of NH₄⁺-N and COD by vermiculite.The main results show:1.Base on the following assumptions that l):gross sorption quantity Q_e is in direct proportion to the NH₄⁺-N concentration (C_e) and adsorption potential (P) at equilibrium;2): if sorbent quantity (W₀) is tended to infinitely greatly, the sorption quantity per unit sorbent q_e trends towards zero and the maximum sorption quantity Q_m trends towards the initial concentration (C₀);if C₀ is tended to infinitely greatly,q_e trends towards the maximum sorption quantity per unit sorbent (q_m) and Q_m trendstowards Woqm.This paper established a general thermal sorption equation Qe = Wo qm C(/[ qmKw + Wo (qm -qe)+ Co] which gave high levels of accuracy in describing the thermal sorption processes of NH/-N adsorption by sorbents.2.The general thermal sorption equation contains two essential feature parameters: Saturated Adsorption capacity qm and medium coefficient Kw\ Kw represents medium to the affinity absorbing ion. Adopting the curve to simulate the general thermal sorption equation ,the Saturated Adsorption capacity qm and the medium coefficient Kw were found to be respectively 22 mg/g and 15.5 g/L for vermiculite, 45 mg/g and 8 g/L for synthetic zeolite and 60 mg/g and 6 g/L for 732 cation exchange resin.3.This paper putted forward the C(/qm(Kw + Wo)