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

【摘要】：隨著我國(guó)人口的增加和經(jīng)濟(jì)的發(fā)展,剩余污泥的產(chǎn)量逐年增加,污泥處理的費(fèi)用已經(jīng)成為污水處理領(lǐng)域的瓶頸,近年來(lái),基于微型動(dòng)物捕食作用的污泥減量技術(shù)從源頭上減少污泥產(chǎn)量,具有純生態(tài)、無(wú)二次污染等優(yōu)點(diǎn),越來(lái)越受到重視。但目前蠕蟲反應(yīng)器的穩(wěn)定性無(wú)法保證,而影響蠕蟲生長(zhǎng)的主要因素是反應(yīng)器內(nèi)部流場(chǎng)的變化和溶解氧的分布,因此,本文采用數(shù)值模擬與試驗(yàn)驗(yàn)證相結(jié)合的方法,研究蠕蟲反應(yīng)器內(nèi)不同曝氣量及蠕蟲投放位置對(duì)污泥減量效果的影響,并與常規(guī)污泥處理處置方法對(duì)比,進(jìn)行經(jīng)濟(jì)性分析評(píng)價(jià)。利用ANSYS FLUENT 16.0提供的歐拉兩相流模型和標(biāo)準(zhǔn)k-ε湍流模型,對(duì)蠕蟲反應(yīng)器內(nèi)部速度場(chǎng)、含氣率以及湍流強(qiáng)度等分布進(jìn)行了數(shù)值模擬分析,得到了蠕蟲在反應(yīng)器內(nèi)的最優(yōu)投放位置且曝氣量約為0.2m3/h時(shí),污泥減量效果最好。構(gòu)建以序批式反應(yīng)器(SBR)為主體工藝并聯(lián)合蠕蟲減量反應(yīng)器的生活污水處理系統(tǒng),對(duì)上述模擬結(jié)果進(jìn)行試驗(yàn)驗(yàn)證;試驗(yàn)結(jié)果表明,污泥減量率(以質(zhì)量計(jì))最高時(shí)為23%,此時(shí)反應(yīng)器內(nèi)蠕蟲投放在最優(yōu)位置且曝氣量約為0.2m3/h,驗(yàn)證了模擬結(jié)果的可靠性;進(jìn)一步通過(guò)響應(yīng)曲面法(BBD分析法)對(duì)蠕蟲減量污泥效果的三個(gè)影響因素(曝氣量、蠕蟲投放位置、減量污泥濃度)進(jìn)行試驗(yàn)分析,結(jié)果與理論最優(yōu)值吻合良好,佐證了數(shù)值模擬結(jié)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(yùn)行SBR-蠕蟲減量污泥反應(yīng)器系統(tǒng),與SBR-常規(guī)污泥處理工藝系統(tǒng)進(jìn)行經(jīng)濟(jì)性對(duì)比分析。蠕蟲攝食污泥釋放的氨氮和總磷回流到SBR反應(yīng)器導(dǎo)致總氮、總磷增加了4%、12%,相應(yīng)地造成SBR污水處理系統(tǒng)每日處理費(fèi)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(shè)備費(fèi)用明顯減少。有蠕蟲減量的污泥處理較無(wú)蠕蟲減量的污泥處理總基建費(fèi)用節(jié)省了約19萬(wàn)元/t污泥,每日運(yùn)行費(fèi)用節(jié)省了4.6元/t污泥;除此之外,每日產(chǎn)生的蠕蟲可創(chuàng)造經(jīng)濟(jì)價(jià)值約為460元/t污泥,這完全可以抵消掉有蠕蟲減量時(shí)SBR污水處理系統(tǒng)所增加的處理費(fèi)用。因此,利用蠕蟲進(jìn)行污泥減量從經(jīng)濟(jì)上是可行的,更重要的是其可以實(shí)現(xiàn)生態(tài)循環(huán),具有良好的應(yīng)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(xué)位授予單位】：內(nèi)蒙古工業(yè)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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