發(fā)布時間：2018-06-13 10:15

  本文選題：數(shù)值模擬 + 蠕蟲反應器��； 參考：《內蒙古工業(yè)大學》2017年碩士論文

【摘要】：隨著我國人口的增加和經(jīng)濟的發(fā)展,剩余污泥的產量逐年增加,污泥處理的費用已經(jīng)成為污水處理領域的瓶頸,近年來,基于微型動物捕食作用的污泥減量技術從源頭上減少污泥產量,具有純生態(tài)、無二次污染等優(yōu)點,越來越受到重視。但目前蠕蟲反應器的穩(wěn)定性無法保證,而影響蠕蟲生長的主要因素是反應器內部流場的變化和溶解氧的分布,因此,本文采用數(shù)值模擬與試驗驗證相結合的方法,研究蠕蟲反應器內不同曝氣量及蠕蟲投放位置對污泥減量效果的影響,并與常規(guī)污泥處理處置方法對比,進行經(jīng)濟性分析評價。利用ANSYS FLUENT 16.0提供的歐拉兩相流模型和標準k-ε湍流模型,對蠕蟲反應器內部速度場、含氣率以及湍流強度等分布進行了數(shù)值模擬分析,得到了蠕蟲在反應器內的最優(yōu)投放位置且曝氣量約為0.2m3/h時,污泥減量效果最好。構建以序批式反應器(SBR)為主體工藝并聯(lián)合蠕蟲減量反應器的生活污水處理系統(tǒng),對上述模擬結果進行試驗驗證;試驗結果表明,污泥減量率(以質量計)最高時為23%,此時反應器內蠕蟲投放在最優(yōu)位置且曝氣量約為0.2m3/h,驗證了模擬結果的可靠性;進一步通過響應曲面法(BBD分析法)對蠕蟲減量污泥效果的三個影響因素(曝氣量、蠕蟲投放位置、減量污泥濃度)進行試驗分析,結果與理論最優(yōu)值吻合良好,佐證了數(shù)值模擬結果的可靠性。以最優(yōu)工況(曝氣量0.2m3/h、蠕蟲最優(yōu)投放位置P2)運行SBR-蠕蟲減量污泥反應器系統(tǒng),與SBR-常規(guī)污泥處理工藝系統(tǒng)進行經(jīng)濟性對比分析。蠕蟲攝食污泥釋放的氨氮和總磷回流到SBR反應器導致總氮、總磷增加了4%、12%,相應地造成SBR污水處理系統(tǒng)每日處理費用增加約130.076元/m3水;經(jīng)蠕蟲攝食后的剩余污泥脫水性能提高,后續(xù)常規(guī)污泥處理的消化池、污泥脫水、污泥干化設備費用明顯減少。有蠕蟲減量的污泥處理較無蠕蟲減量的污泥處理總基建費用節(jié)省了約19萬元/t污泥,每日運行費用節(jié)省了4.6元/t污泥;除此之外,每日產生的蠕蟲可創(chuàng)造經(jīng)濟價值約為460元/t污泥,這完全可以抵消掉有蠕蟲減量時SBR污水處理系統(tǒng)所增加的處理費用。因此,利用蠕蟲進行污泥減量從經(jīng)濟上是可行的,更重要的是其可以實現(xiàn)生態(tài)循環(huán),具有良好的應用前景。
[Abstract]:With the increase of population and economic development in China, the output of excess sludge is increasing year by year, and the cost of sludge treatment has become the bottleneck in the field of sewage treatment. Sludge reduction technology based on predation of microfauna has been paid more and more attention because of its advantages of reducing sludge production from source, having the advantages of pure ecology and no secondary pollution. However, the stability of helminth reactor cannot be guaranteed at present, and the main factors affecting worm growth are the variation of flow field and the distribution of dissolved oxygen in the reactor. Therefore, the method of numerical simulation and experimental verification is used in this paper. The effect of different aeration amount and worm position on sludge reduction in helminth reactor was studied, and compared with conventional sludge treatment and disposal methods, economic analysis and evaluation were carried out. Using the Euler two-phase flow model and the standard k- 蔚 turbulence model provided by ANSYS fluent 16.0, the velocity field, gas holdup and turbulence intensity in the helminth reactor were numerically simulated and analyzed. The best sludge reduction effect was obtained when the optimal placement of worm in the reactor and the aeration rate was about 0.2m3/h. A domestic wastewater treatment system with sequencing batch reactor (SBR) as the main process and a worm decrement reactor as the main process was constructed, and the above simulation results were tested and verified. The sludge reduction rate is 23 when the sludge reduction rate is the highest, and the worm in the reactor is placed in the optimal position and the aeration rate is about 0.2 m3 / h, which verifies the reliability of the simulation results. Three factors (aeration rate, worm position, sludge concentration) of worm sludge reduction were analyzed by response surface method (BBD analysis). The results are in good agreement with the theoretical optimal value. The reliability of the numerical simulation results is verified. SBR- worm sludge reduction reactor system was operated under the optimal operating conditions (aeration rate 0.2 m3 / h, worm optimal placement position P2), and compared with SBR- conventional sludge treatment process system. The return of ammonia nitrogen and total phosphorus released by worm feed sludge to SBR reactor led to total nitrogen, total phosphorus increased by 4% and 12%, which resulted in the increase of daily treatment cost of SBR sewage treatment system by about 130.076 yuan / m ~ 3 of water, and the dewatering performance of surplus sludge after worm feeding was improved. The cost of sludge dewatering and sludge drying equipment in the digesting tank of conventional sludge treatment was obviously reduced. The total infrastructure cost of treating sludge with worm reduction is about 190000 yuan / t compared with the total infrastructure cost of non-worm reduction sludge treatment, and the daily operating cost is 4.6 yuan / t sludge savings; in addition, The daily production of worms can create an economic value of about 460 yuan / t of sludge, which can completely offset the increased treatment cost of SBR sewage treatment system with worm reduction. Therefore, it is economically feasible to use worm to reduce sludge, and more importantly, it can realize ecological cycle, which has a good application prospect.
【學位授予單位】：內蒙古工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：X703

【參考文獻】

相關期刊論文 前10條

1 王蒙;孫楠;王穎;程文;;曝氣池中氣液兩相流速度場分布的實驗研究與數(shù)值模擬[J];水利學報;2016年10期

2 何強;吉芳英;李家杰;;污泥處理處置及資源化途徑與新技術[J];給水排水;2016年02期

3 魏文禮;李盼盼;白朝偉;劉玉玲;;曝氣池內氣液混合液兩相流力學特性的數(shù)值模擬[J];水資源與水工程學報;2015年06期

4 初里冰;邢新會;;污泥減量化污水處理技術進展[J];生物產業(yè)技術;2015年03期

5 艾翠玲;何新宇;雷英杰;;不同填料負載水蚯蚓的污泥減量研究[J];環(huán)境工程;2014年08期

6 黃偉飛;舒英鋼;蔡璐;斯f亮;金建華;黃鐵鋒;;不同曝氣能耗對水蚯蚓原位消解污泥的影響[J];環(huán)境工程;2013年03期

7 劉云興;遲曉德;;污泥減量化技術研究進展與發(fā)展趨勢[J];環(huán)境科學與管理;2013年06期

8 趙陸海波;廖波;王小泉;劉小浩;孫予罕;;不同分布器對鼓泡塔氣液兩相流影響的CFD模擬[J];現(xiàn)代化工;2012年11期

9 肖柏青;張法星;戎貴文;;氣泡尺寸對曝氣池內氣液兩相流數(shù)值模擬的影響[J];中國環(huán)境科學;2012年11期

10 白潤英;宋蕾;宋虹葦;;寡毛類蠕蟲污泥減量技術的穩(wěn)定性研究進展[J];環(huán)境工程;2011年S1期

相關博士學位論文 前1條

1 陳群;階梯溢流壩紊流數(shù)值模擬及實驗研究[D];四川大學;2001年

相關碩士學位論文 前6條

1 孟錦;城鎮(zhèn)污泥處理處置方案綜合評價研究[D];西安建筑科技大學;2015年

2 鄭許浩翔;基于CFD的水噴射泵的數(shù)值模擬研究[D];東北大學;2013年

3 黃嘉;附著型蠕蟲床流場數(shù)值模擬[D];哈爾濱工業(yè)大學;2010年

4 盧耀斌;SBR+附著型蠕蟲床聯(lián)合工藝研究[D];哈爾濱工業(yè)大學;2009年

5 齊洪波;流化床氣液兩相流流場數(shù)值模擬研究[D];哈爾濱工業(yè)大學;2008年

6 汪禮;常用湍流模型適用性分析及翼型VOF數(shù)值模擬[D];華中科技大學;2007年

，

本文編號：2013686