本文選題：人工濕地　切入點(diǎn)：浮橋技術(shù)　出處：《西南科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本課題實(shí)驗(yàn)在了解人工濕地文獻(xiàn)資料和現(xiàn)有研究成果的基礎(chǔ)上,對傳統(tǒng)人工濕地技術(shù)進(jìn)行改進(jìn),通過引進(jìn)浮橋技術(shù),在同一濕地單元中采用浮游植物搭配沉水植物聯(lián)合對污水進(jìn)行處理,并與兩級傳統(tǒng)下行潛流式濕地單元進(jìn)行組合,設(shè)計(jì)出一組復(fù)合型人工濕地處理系統(tǒng),研究該系統(tǒng)對生活污水中COD、NH3-N、TN、TP的凈化效果。研究結(jié)果表明:(1)在整個(gè)實(shí)驗(yàn)運(yùn)行期內(nèi),系統(tǒng)COD進(jìn)水濃度在125.7~186.1mg/L之間,出水濃度在21.3~41.7mg/L之間,去除率維持在71.0%~83.7%;NH3-N進(jìn)水濃度在21.2~26.2mg/L之間,出水濃度在6.1~10.2mg/L之間,去除率維持在53.9~71.4%;TN進(jìn)水濃度在26.4~31.3mg/L之間,出水濃度在9.9~15.3mg/L之間,去除率維持在44.8~63.3%;TP進(jìn)水濃度在1.62~2.71mg/L之間,出水濃度在0.32~0.87mg/L之間,去除率維持在68.0~80.3%。(2)濕地系統(tǒng)二級浮橋平流式濕地單元對COD的去除效果較另外兩級傳統(tǒng)潛流式濕地單元差,但對NH3-N、TN和TP的去除效果突出。整個(gè)系統(tǒng)COD、TN出水濃度可以達(dá)到《城鎮(zhèn)污水處理廠污染物排放標(biāo)準(zhǔn)》(GB 18918~2002)中的一級A標(biāo)準(zhǔn),NH3-N和TP出水濃度可以達(dá)到一級B標(biāo)準(zhǔn)。(3)濕地單元內(nèi)各指標(biāo)去除率的Pearson相關(guān)性分析顯示,系統(tǒng)HVF1中COD-NH3-N、COD-TN和NH3-N-TN的去除率之間存在一定的相關(guān)性;HF2中NH3-N-TN、COD-NH3-N和NH3-N-TP的去除率具有較好的相關(guān)性;HVF3中由于受進(jìn)水濃度較低的影響,除TN-TP的去除率之間存在一定的線性相關(guān)外,其他各指標(biāo)間不存在明顯相關(guān)性。(4)濕地系統(tǒng)內(nèi)水力學(xué)特征分析表明,各級濕地單元中污水流動(dòng)過程中均存在一定的返混現(xiàn)象,HVF1和HVF3兩級潛流式濕地單元的返混程度較小,流態(tài)也較為穩(wěn)定,HF2平流式濕地單元的返混程度較為嚴(yán)重。系統(tǒng)運(yùn)行后期濕地滲透系數(shù)開始呈現(xiàn)不均性分布,對污染物的去處效果也有所下降。
[Abstract]:On the basis of understanding the literature and existing research results of artificial wetland, this paper improves the traditional constructed wetland technology and introduces floating bridge technology. In the same wetland unit, a composite constructed wetland treatment system was designed by using the combination of phytoplankton and submerged plants, and combined with two levels of traditional downlink subsurface flow wetland unit. The results showed that the influent concentration of COD was between 125.7 mg / L and 186.1 mg / L, the effluent concentration was between 21.3N and 41.7 mg / L, and the removal rate was maintained at 71.083.7U NH3-N between 21.2mg/ L and 26.2mg/ L during the whole operating period of the experiment, and the removal rate of NH3-N was between 21.2mg / L and 26.2 mg / L, respectively, and the removal rate of NH3-N was between 21.2mg / L and 26.2mg/ L, and the removal rate of NH3-N was between 21.2mg / L and 26.2mg / L, respectively. The effluent concentration was in the range of 6.1 ~ 10.2 mg / L, the removal rate was maintained at 53.9 ~ 71.4 mg / L, the influent concentration of TN was 26.44.31. 3 mg / L, the effluent concentration was between 9.9 ~ 15.3 mg / L, the removal rate was maintained in the range of 1.622.71 mg / L, the effluent concentration was between 0.32 and 0.87 mg / L, the removal rate was maintained in the range of 44.8 ~ 10.2 mg / L, and the effluent concentration was between 0.32 and 0.87 mg / L, respectively. The removal rate of COD was maintained at 68.0% 80.3%. 2) the COD removal efficiency of the secondary floating bridge advection wetland unit in the wetland system was lower than that of the other two subsurface flow wetland units. However, the removal effect of NH3-NN and TP is outstanding. The effluent concentration of CODN in the whole system can reach the first class A standard (NH _ 3-N) and the effluent concentration of TP can be up to the first class B standard. 3) the effluent concentration of COD _ (TN) in the whole system can reach the first class A standard (GB 1891818 ~ 2002), and the effluent concentration of TP can reach the first class B standard. The Pearson correlation analysis of the removal rate of each index within the unit showed that, There is a certain correlation between the removal rate of COD-NH _ 3-N and NH3-N-TN in system HVF1. The removal efficiency of NH _ 3-N-TNN _ (COD-NH _ 3-N) and NH3-N-TP in HF2 has a good correlation. In HVF3, there is a linear correlation between the removal rate of TN-TP and the removal rate of TN-TP due to the low influent concentration. There is no obvious correlation among other indexes. (4) the analysis of hydraulic characteristics in wetland system shows that there is a certain phenomenon of backmixing in the process of sewage flow in all levels of wetland units. The degree of backmixing of HVF1 and HVF3 subsurface flow wetland units is relatively small. The backmixing degree of HF2 advection wetland unit is more serious, and the wetland permeability coefficient begins to show uneven distribution in the later stage of the system operation, and the effect on the location of pollutants is also decreased.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X799.3

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