|
With the accelerated process of China's economic development and urbanization, the urban population continue to focus its wastewater emissions increasing the towns water pollution problems have become increasingly exacerbated a serious impact on China's water environment. Artificial wetland treatment technologies and conventional compared with investment, low running costs, low management requirements, handling and high efficiency, suitable for handling the sewage of the small towns and rural non-point source pollution. But the cold northern regions using the traditional artificial wetland wastewater treatment technology there are difficult winter in the northern region. Cold Northeast climate, choose natural soil, zeolite, slag decontamination of the effect is good, cheap and easy to get packing by building different matrix matrix proportion vertical undercurrent biofilter, solving artificial wet winter in the northern region run problems are discussed, explore the low-temperature decontamination of the degree of influence as well as the system to deal with the effect of different types of packed bed mechanism, designed to favorable technical support for the application of wetland technology cold climate of the northern region. Static experimental study of the adsorption properties of the filler, including the study of adsorption kinetics and adsorption characteristics, the data fit to the experimental results obtained theoretical saturated adsorption capacity, equilibrium time, adsorption stability indicative indicators, adsorption performance of the filler is to evaluate and explore the filler adsorption principle. Building size 35cm × 25cm × 20cm vertical undercurrent packed bed during operation of the reactor plant case run state simulation of artificial wetlands in winter, were run under low-temperature conditions of room temperature and outdoor study of turbidity, organic matter, nitrogen and phosphorus such pollutants removal performance, compared to the differences in the ability of the filler bed decontamination of different fillers, as well as under different temperature conditions, and to reflect the characteristics of the reactor indicators such as dissolved oxygen, pH, oxidation-reduction potential, microbiological indicators were analyzed . Research results show that the zeolite good adsorption capacity of ammonia, natural soil, slag, nitrogen, phosphorus, have better adsorption; zeolite, slag, zeolite / slag mixed packed bed of sewage purification capacity, which zeolite bed denitrification better, on average total nitrogen removal rate of 82.7%, and low temperatures, but also to maintain good nitrogen removal efficiency; slag bed phosphorus removal, better degradation of organic matter, total phosphorus and TOC the average removal rates were 94.1%, 80.8%; packed bed low temperatures decrease the removal rate of ammonia nitrogen, phosphorus, suspended solids removal is less affected by temperature, slag bed and mixed bed in Low total nitrogen removal decreased; reactor a large number of microorganisms accumulate, overall, the soil surface microbial biomass and biological activity are higher than the lower filler, the microbial activity within the reactor can be a certain degree reveal its decontamination mechanism.
|