本文關(guān)鍵詞： 人工濕地 城鎮(zhèn)污水廠尾水 脫氮除磷　出處：《鄭州大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本研究采用偶聯(lián)式人工濕地處理城鎮(zhèn)污水廠尾水,提高人工濕地內(nèi)部組成環(huán)境,形成高效互利的脫氮除磷系統(tǒng)。偶聯(lián)式濕地由垂直潛流—水平潛流組成,試驗(yàn)選用羊肝石、礫石、砂礫作為基質(zhì)填料,蘆葦、茭白、菖蒲為試驗(yàn)植物。實(shí)驗(yàn)進(jìn)行了48 h靜態(tài)吸附實(shí)驗(yàn),對(duì)氮、磷在基質(zhì)中的吸附效果進(jìn)行分析。利用三種常用的吸附動(dòng)力學(xué)模型對(duì)靜態(tài)吸附試驗(yàn)結(jié)果進(jìn)行分析。本試驗(yàn)主要從兩方面研究偶聯(lián)式人工濕地處理污水廠尾水的效果:(1)分析氨氮、TN、TP、COD等主要污染物的去除率;(2)在溫度和pH變化時(shí),污染物的去除率所受到的影響,確定人工濕地的最佳控制條件。通過(guò)上述方法,試驗(yàn)得出以下結(jié)論:(1)基質(zhì)經(jīng)過(guò)48h的靜態(tài)吸附試驗(yàn),分為四組:羊肝石、砂礫、礫石、按一定配比各組,TP去除率分別為25.17%、68.88%、52.35%、61.56%,TN去除率分別為17.26%、31.07%、23.11%、26.80%。砂礫組對(duì)磷和氮的吸附作用效果強(qiáng)于羊肝石和礫石,按一定配比組,中和了砂礫與礫石的優(yōu)點(diǎn),脫氮除磷效果相比較好,同時(shí)與砂礫組相比,更加穩(wěn)定。(2)選用3種吸附動(dòng)力學(xué)模型對(duì)TN、TP去除效果進(jìn)行擬合。根據(jù)相關(guān)系數(shù),TP均達(dá)到顯著水平,可以判斷出磷的吸附過(guò)程中,存在影響因子反應(yīng)速率、擴(kuò)散因子等因素。TN的相關(guān)系數(shù)值較小,顯著性水平均較低,結(jié)合人工濕地中氮的去除原理,主要通過(guò)微生物作用去除,基質(zhì)的吸附作用脫氮的比率很低,靜態(tài)吸附試驗(yàn)結(jié)果說(shuō)明在TN的去除過(guò)程中,基質(zhì)吸附去除作用進(jìn)行脫氮的比重較小。(3)經(jīng)人工濕地處理后的出水中各污染物濃度為COD 5~12 mg/L、氨氮0.1~0.5 mg/L、TN 7.5~20 mg/L、TP 0.3~0.7 mg/L,出水各污染物平均值為COD 8mg/L、氨氮0.3 mg/L、TN 11 mg/L、TP 0.54 mg/L。除TP基本可以達(dá)到一級(jí)A標(biāo)準(zhǔn)外,其他指標(biāo)均可穩(wěn)定達(dá)到一級(jí)A標(biāo)準(zhǔn)。(4)溫度變化對(duì)人工濕地中各污染物去除率有一定影響,呈現(xiàn)正相關(guān)關(guān)系,各個(gè)污染物最適處理溫度為:COD 15~25℃,氨氮17~22℃,TN 20~25℃,TP17~22℃;pH變化對(duì)脫氮除磷影響分析,氨氮、TN去除率與pH呈負(fù)相關(guān),規(guī)律較明顯,pH先降低后增高,氨氮、TN去除率呈現(xiàn)先增高后降低。TP去除率整體呈現(xiàn)與pH值正相關(guān),特別是9~10月,pH值出現(xiàn)拐點(diǎn)處,TP去除率出現(xiàn)同樣拐點(diǎn),但規(guī)律并不明顯。
[Abstract]:In this study, the coupling constructed wetland was used to treat the tail water of the municipal wastewater treatment plant, to improve the internal composition environment of the constructed wetland and to form a highly efficient and mutually beneficial nitrogen and phosphorus removal system. The coupling wetland was composed of vertical subsurface flow and horizontal subsurface flow, and the sheep liver stone was selected in the experiment. Gravel, sand gravel as substrate filler, Reed, Zizania latifolia and Acorus calamus as experimental plants. The adsorption effect of phosphorus in substrate was analyzed. The results of static adsorption test were analyzed by using three kinds of commonly used adsorption kinetic models. The effect of coupling constructed wetland on the tail water of sewage treatment plant was studied from two aspects. The removal rate of the main pollutants, such as ammonia nitrogen, TNN, TPN, COD and so on, was analyzed when the temperature and pH changed. The influence of the removal rate of pollutants and the determination of the optimal control conditions of the constructed wetland. Through the above method, the following conclusions can be drawn: 1) the matrix is divided into four groups after 48 h static adsorption test: sheep liver stone, sand gravel, gravel, and gravel. The removal rates of TP in each group were 25.17 and 68.88, respectively, and the removal rates of TN were 17.26267.31.07and 23.110.26.80.The adsorption effect of sand gravel group on phosphorus and nitrogen was stronger than that of sheep liver stone and gravel. According to a certain ratio, the advantages of sand gravel and gravel were neutralized, and the effect of nitrogen and phosphorus removal was better than that of sand gravel. At the same time, compared with grit group, it is more stable. 2) three kinds of adsorption kinetic models are used to fit the removal efficiency of TNT TP. According to the significant level of correlation coefficient of TP, it can be determined that the reaction rate of influencing factors exists in the process of phosphorus adsorption. The correlation coefficient of diffusion factor, TN and other factors were smaller, and the significant level was lower. Combined with the principle of nitrogen removal in constructed wetland, the removal rate of nitrogen was very low by the removal of nitrogen by microorganism, and the ratio of nitrogen removal by substrate adsorption was very low. The static adsorption test results show that in the process of TN removal, The concentration of pollutants in effluent treated by artificial wetland was COD 5g / L, ammonia nitrogen 0.1 mg / L 0.5 mg / L, ammonia nitrogen 0.1 mg / L 0.5 mg / L, 20 mg / L TP 0.30.7 mg / L, the average value of each pollutant in effluent was COD 8 mg / L, ammonia nitrogen 0.3 mg / L, ammonia nitrogen 0.3 mg / LTN 11 mg / L, TP 0.54 mg / L. Basically up to the A-level A standard, The other indexes can reach the first class A standard.) the change of temperature has a certain influence on the removal rate of pollutants in constructed wetland, showing a positive correlation. The optimum treatment temperature of each pollutant is 25 鈩，

本文編號(hào)：1529788