本文選題：黑臭河道 + 曝氣復(fù)氧　； 參考：《東南大學(xué)》2016年碩士論文

【摘要】：傳統(tǒng)河道曝氣技術(shù)能在短時間內(nèi)提高水體溶解氧濃度、消除河道黑臭狀態(tài),在河道水質(zhì)改善方面具有一定的可行性和優(yōu)越性。本文嘗試將投加微生物工程菌、礫間接觸氧化法與河道曝氣技術(shù)有機結(jié)合,研發(fā)長期效果更好的組合工藝。主要研究內(nèi)容及結(jié)論如下：(1)0.33m3/m2·h、1.66m3/m2·h、3.33m3/m2·h三種曝氣強度的比較表明,曝氣強度大水質(zhì)改善效果更顯著,考慮到經(jīng)濟成本后選擇的曝氣量為1.66m3/m2·h。該曝氣強度下,78h連續(xù)曝氣后CODMn、NH3-N分別從16.6mg/L、11.8 mg/L降低到11.2mg/L和8.37mg/L：綜合比較水質(zhì)改善效果和經(jīng)濟性后,確定工程菌投加量為500mL/t,投加7d后CODMn、NH3-N分別從18.2 mg/L、8.03 mg/L下降到10.1 mg/L和5.69 mg/L;而間歇曝氣條件下投加工程菌,7d后CODMn、NH3-N 從17.3 mg/L、8.29 mg/L下降至6.6 mg/L和5.63 mg/L。(2)投加工程菌掛膜后,30cm、50cm、80cm三種高度礫石床的比較表明,礫石填料越高水質(zhì)改善效果越好。80cm厚礫石填料,靜水7d后CODMn、NH3-N從18.6mg/L、9.37mg/L下降到10.3mg/L、6.09mg/L; 0.5m/h、0.25m/h、0.125m/h三種不同流速比較表明,流速慢時效果更好,曝氣條件下工程菌強化礫石河床的工藝適用于緩流水體,流速為0.125m/h時,CODMn、NH3-N從17.8mg/L、8.77mg/L分別下降到11.9mg/L和6.88mg/L。(3)模擬河道的連續(xù)運行結(jié)果表明：一次投加工程菌種礫石(50em)掛膜成功后,水流流速0.125m/h、每天曝氣2h,水質(zhì)改善效果可至少維持25天,CODMn、NH3-N去除率為27.3%-47%和10.9%～33.4%。低溫條件下(最低氣溫.3℃-8℃),各種措施的效果都有下降,單純曝氣對CODMn和NH3-N的去除率都為約20%,投加工程菌對CODMn幾乎沒有效果,而對NH3-N仍有25%的去除率,曝氣加工程菌對CODMn、NH3-N去除率約40%和30%,而投加工程菌掛膜后的礫石床對CODMn、NH3-N的去除率僅有約10%。(4)以宜興市和橋鎮(zhèn)的公園河為例,按照礫石河床(50cm)、間歇曝氣(2h/d)、投加工程菌(一次性投加500mL/t)的組合工藝,進行了工程設(shè)計計算,總需氧量為7.6kgO2/d,工程投資約9.2萬元、運行費用為73.08元/d,同類型河道的修復(fù)工程投資費用為80萬元/km、運行費為635元／(d·km)。
[Abstract]:The traditional aeration technology can improve the dissolved oxygen concentration in the water in a short time, eliminate the black-smelling state of the river, and have certain feasibility and superiority in improving the water quality of the river. This paper attempts to develop a better long-term effect combination process by adding microbial engineering bacteria, contact oxidation between gravel and river aeration technology. The main research contents and conclusions are as follows: (1) the comparison of three aeration intensities of 1.66m3mm3 / m2h and 3.33m3m2h shows that the effect of improving water quality with high aeration intensity is more remarkable, and the aeration rate chosen after considering the economic cost is 1.66m3/m2 h. After continuous aeration for 78 h, the NH3-N of CODMnn decreased from 16.6 mg / L to 11.8mg / L to 11.2 mg / L and 8.37 mg / L, respectively. It was determined that the dosage of engineering bacteria was 500mL / t, and the NH3-N of CODMnn decreased from 18.2 mg / L 8.03 mg / L to 10.1 mg / L and 5.69 mg / L respectively after 7 days of addition, while after 7 days of intermittent aeration, CODMnNH3-N decreased from 17.3 mg / L to 6.6 mg / L and 5.63 mg / L respectively. (2) the three heights of CODMnNH3-N were decreased from 17.3 mg / L to 6.6 mg / L and 5.63 mg / L respectively. (2) the three heights of CODMnNH3-N were decreased from 17.3 mg / L to 6.6 mg / L and 5.63 mg / L respectively under intermittent aeration. A comparison of gravel beds shows that The higher the gravel packing, the better the effect of improving the water quality. The better. 80 cm thick gravel packing. After 7 days of static water, the NH3-N of CODMnn decreased from 18.6 mg / L 9.37 mg / L to 10.3 mg / L 6.09 mg / L; 0.5 mg / h 0.25 m / h / 0.125 m/ h; three different flow rates showed that the effect was better when the flow rate was slow. Under aeration condition, the process of strengthening gravel bed by engineering bacteria is suitable for the slow flow water. When the flow rate is 0.125m/h, the NH3-N of CODMnN decreases from 17.8mg / L to 11.9mg / L and 6.88mg / L respectively. When the flow velocity is 0.125 m / h and aeration is 2 h per day, the effect of water quality improvement can be maintained for at least 25 days. The removal rate of NH3-N of CODMnU is 27.3- 47% and 10.9% respectively. At low temperature (minimum temperature of 3 鈩，

本文編號：2090911