| Disperesed swine wastewater had characteristics of high organic matter, riching in nitrogen and phosphorus. It was important to bulid a treatment process of less investment, less consumpution, easy operation, and excellent performance of nitrogen and phosphorus removal. Based on the understanding of source separation technology, ABR-Functional Zoning Type Artifical Wetland were built to treat dispersed swine wastewater and the operating characteristics of ABR and Functional Zoning Type Enhanced TN removal Artifical Wetland, the processes of nitrogen and phosphorus removing and transforming in the wetland were studied along with the analyzing with 16 S rRNA sequence analysis of microbial community structure. At last the reason and measures of wetland clogging were analysiced. The conclusions of this research were as follows:(1) The inffluent of ABR was disperesed swine wastewater effluent after source separation, while the concentrations of COD inffluent was 2000mg/L, the volumetric load of COD influent was 1.0 kgCOD/(m3·d). Removal rate of COD in the ABR was 70 ~ 80 % with intermittent operation mode, the concentrations of COD effluent was 340 ~ 450 mg/L after the treatment of ABR. The concentrations of COD and SS degraded over time and flow path, that the pH and alkalinity decreased first before increased again. The influent of tyrosine-like, tryptophan-like, and humic-like were all degraded over time and flow path. ABR had a certain impact resistance to hydraulic loading, but poor impact resistance to organic loading. Removal rate of COD had a dramatic decline in winter, that the average removal rate is 65.82 % along with the rising of SS effluent.(2)The wetland showed a significant function division that the aerobic zone with zeolite layer for the adsorption of ammonia nitrogen and its bio-regeneration as well as the adsorption and interception of most organic matter, the anoxic zone with slag brick layer for denitrification and the adsorption of total phosphorus. The ORP measurement results demonstrated that the reinforced oxygen pipe could enhance the ability of reoxygenation. The nitrification rate of unit zeolite layer had not decreased with the increasing of zeolite thickness thus the thickness of zeolite layer could still be appropriately increased. The total removal rate of COD, NH4+-N, TN and TP were 84.75 %, 61.66 %, 56.76 % and 65.89 % under the tidal flow operation mode, that the concentration of inlet COD and ammonia nitrogen was respectively 1000 mg/L, 250 mg/L with total inflow of 50 L/d.(3)The adsorption of zeolite to COD, NH4+-N, TP was a rapid process that removal rates of COD, NH4+-N, TP and the concentration of total oxidation nitrogen were largest among 0 ~ 15 min and slow down afterwards. The COD, NH4+-N, TP and total oxidation nitrogen were removed over time and flow path in the slag brick layer. The influent of tryptophan-like, humic-like and soluble microbial by-products were degraded through the zeolite and slag brick layers.(4)The processes of nitrogen and phosphorus removing and transforming in the wetland were studied and the results showed that the main way of nitrogen removal was nitrification/denitrification accounting for 85.55 %. Stromal adsorption was the primary mode of phosphorus removel in the artificial wetland, accounting for 98.30 %.(5) The result of scanning electron microscope showed that the biofilm on the surface of zeolite and slag brick were thick because of their rough surface that were easy for biofilm formation. The results of 16 S rRNA turned out that the dominant bacterias on the three compartment sludge of ABR all were Firmicutes while the dominant bacterias on the surface of zeolite and slag brick were Proteobacteria and Firmicutes at the division level, respectively.(6)The wetland clogged and gone wrong with short-circuiting because of the collector pipe clogged, and not happened again after the restoration. |
PDF Full Text Request