【摘要】：本文以地下滲濾系統(tǒng)為研究對(duì)象,構(gòu)建一套模擬污水地下滲濾系統(tǒng)的連續(xù)實(shí)驗(yàn)裝置,圍繞系統(tǒng)的再啟動(dòng)及氨氮、有機(jī)氮的去除機(jī)理及其影響因素進(jìn)行研究,為地下滲濾系統(tǒng)強(qiáng)化脫氮技術(shù)的研究和關(guān)鍵運(yùn)行的參數(shù)調(diào)控提供理論基礎(chǔ),研究結(jié)果可指導(dǎo)其在分散生活污水處理中的設(shè)計(jì)與應(yīng)用。主要研究成果如下:(1)地下滲濾系統(tǒng)的再啟動(dòng)周期的研究表明:COD的再啟動(dòng)周期為15 d;NH_4~+-N的再啟動(dòng)周期為17d;TP的再啟動(dòng)周期為16 d。該系統(tǒng)的再啟動(dòng)周期應(yīng)以最長(zhǎng)的啟動(dòng)周期為基準(zhǔn),即17 d。再啟動(dòng)完成后NH_4~+-N、COD、TP去除率達(dá)83%、80%、90%以上。(2)地下滲濾系統(tǒng)對(duì)氨氮的去除機(jī)理及影響因素研究結(jié)果表明:污水地下滲濾系統(tǒng)中NH_4~+-N去除的最適水力負(fù)荷為0.10 m3/(m2·d),最適進(jìn)水有機(jī)物濃度為250-260 mg/L,最適C/N比為3:1,最適干濕比為2:1。此時(shí)系統(tǒng)中NH_4~+-N、COD、TP的去除率達(dá)90.8%、88.1%、87.7%以上。NH_4~+-N去除過(guò)程中,當(dāng)水力負(fù)荷為0.10 m3/(m2·d)時(shí),氨揮發(fā)去除的氮占3.5%,硝化-反硝化作用去除的氮量占70.8%,土壤吸附作用去除的氮占16.5%;當(dāng)進(jìn)水有機(jī)物濃度為250-260 mg/L時(shí),氨揮發(fā)去除的氮占3.6%,硝化-反硝化作用去除的氮量占74.3%,土壤吸附作用去除的氮量占15.9%;當(dāng)C/N比為3:1時(shí),氨揮發(fā)去除的氮占5.7%,硝化-反硝化作用去除的氮占71.6%,土壤吸附作用去除的氮占12.6%;干濕比為2:1時(shí),氨揮發(fā)去除的氮占4.3%,硝化-反硝化作用去除的氮占69.4%,土壤吸附作用去除的氮占17.6%。(3)地下滲濾系統(tǒng)對(duì)有機(jī)氮的去除機(jī)理及影響因素研究結(jié)果表明:污水地下滲濾系統(tǒng)中有機(jī)氮去除的最適水力負(fù)荷為0.10 m3/(m2·d),最適進(jìn)水有機(jī)物濃度為250-260 mg/L,最適C/N比為3:1,最適干濕比為1:2。此時(shí)系統(tǒng)中有機(jī)氮、COD、TP的去除率達(dá)66.3%、87.9%、89.1%以上。有機(jī)氮去除過(guò)程中,當(dāng)水力負(fù)荷為0.10 m3/(m2·d)時(shí),氨揮發(fā)作用去除的氮占4.2%,硝化-反硝化作用去除的氮占55.2%,土壤吸附作用去除的氮占6.9%;當(dāng)進(jìn)水有機(jī)物濃度為250-260 mg/L時(shí),氨揮發(fā)作用去除的氮占4.2%,硝化-反硝化作用去除的氮占57.8%,土壤吸附作用去除的氮占26.6%;當(dāng)C/N比3:1時(shí),氨揮發(fā)作用去除的氮占4.9%,硝化-反硝化作用去除的氮占50.8%,土壤吸附作用去除的氮占11.0%;干濕比為1:2時(shí),氨揮發(fā)作用去除的氮占3.1%,硝化-反硝化作用去除的氮占57.2%,土壤吸附作用去除的氮占9.8%。
[Abstract]:Taking the underground percolation system as the research object, this paper constructs a set of continuous experimental equipment to simulate the underground infiltration system of sewage, and studies the mechanism and influence factors of the restarting of the system, the removal mechanism of ammonia nitrogen, organic nitrogen, and so on. It provides a theoretical basis for the study of enhanced denitrification technology in underground percolation system and the parameter regulation of the key operation. The results of the study can guide the design and application of the technology in the treatment of dispersed domestic sewage. The main results are as follows: (1) the restarting cycle of the underground percolation system shows that the restarting cycle of COD is 15 days, the restart cycle of NH _ 4 ~-N is 17 d ~-N, and the restart cycle of 17 d TP is 16 d. The restart cycle of the system should be based on the longest start-up cycle, that is, 17 d. After the start-up was completed, the removal rate of NH_4~-N, COD, TP was 83%, 80%, (2) the mechanism and influence factors of ammonia nitrogen removal by underground infiltration system were studied. The results show that the optimum hydraulic load of NH_4~-N removal is 0.10m ~ 3 / (m ~ 2 路d),). The optimum concentration of organic matter in the influent is 250 ~ 260 mg/L, the optimum C / N ratio is 3 ~ 1, and the optimum dry / wet ratio is 2 ~ 1. When the hydraulic load is 0.10m3 / (m2 路d), the removal rate of NH_4~-N, COD and TP in the system is 90.8%, 88.1%, 87.7% and more than 87.7%, respectively, when the hydraulic load is 0.10m3 / (m2 路d) in the removal process of NH _ 4 ~-N. Ammonia volatilization nitrogen accounted for 3.5%, nitrification-denitrification nitrogen removal accounted for 70.8%, soil adsorption removal of nitrogen accounted for 16.5%. When the influent organic matter concentration was 250 ~ 260 mg/L, the nitrogen removed by ammonia volatilization, nitrification-denitrification and soil adsorption accounted for 3.6%, 74.3% and 15.9%, respectively. When the C / N ratio was 3: 1, the nitrogen removed by ammonia volatilization accounted for 5.7%, the nitrogen removed by nitrification-denitrification accounted for 71.6%, and the nitrogen removed by soil adsorption accounted for 12.6%. When the ratio of dry to wet was 2: 1, the nitrogen removed by ammonia volatilization and nitrification-denitrification accounted for 4.3% and 69.4%, respectively. The removal of organic nitrogen by soil adsorption accounted for 17.6%. (3) the mechanism of organic nitrogen removal by underground infiltration system and its influencing factors were studied. The results showed that the optimal hydraulic load for organic nitrogen removal was 0 in the underground sewerage system. 10 m3 / (m2 路d),) The optimum influent concentration of organic matter is 250 ~ 260 mg/L, the optimum C / N ratio is 3 ~ 1, and the optimum dry / wet ratio is 1 ~ (2) 路h ~ (- 1). The removal rate of organic nitrogen and COD,TP in the system was 66.3%, 87.9% and 89.1% respectively. When the hydraulic loading was 0.10 m3 / (m2 路d), the nitrogen removed by ammonia volatilization accounted for 4.2%, the nitrogen removed by nitrification-denitrification accounted for 55.2%, and the nitrogen removed by soil adsorption accounted for 6.9%. When the influent organic matter concentration was 250 ~ 260 mg/L, the nitrogen removed by ammonia volatilization accounted for 4.2%, the nitrogen removed by nitrification-denitrification accounted for 57.8%, and the nitrogen removed by soil adsorption accounted for 26.6%. When C / N ratio was 3: 1, the nitrogen removed by ammonia volatilization accounted for 4.9%, the nitrogen removed by nitrification-denitrification accounted for 50.8%, and the nitrogen removed by soil adsorption accounted for 11.0%. When the ratio of dry to wet was 1: 2, the nitrogen removed by ammonia volatilization accounted for 3.1%, the nitrogen removed by nitrification-denitrification accounted for 57.2%, and the nitrogen removed by soil adsorption accounted for 9.8%.
【學(xué)位授予單位】：沈陽(yáng)師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X703

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