液哨超生在循環(huán)水殺菌的應用

第28卷第1期化學(xué)反應工程與工藝Vol 28, No 12012年02月Reaction Engineering and Technologyeb.2012文情號:10761(212液哨超聲在循環(huán)水殺菌的應用張陳成,呂效平,韓萍芳(南京工業(yè)大學(xué)化學(xué)化工學(xué)院,超聲化學(xué)工程研究所,江蘇南京210009搞要:研究了一種新型液哨式超聲發(fā)生器以循環(huán)水作為動(dòng)力源,進(jìn)行循環(huán)水的殺菌處理,同時(shí)探討了簧片哨結構循環(huán)水水壓以及溫度對殺菌效果的影響,簧片唷較好結構為簧片厚度(m)x簧片長(cháng)度(mm)x噴距(mm)04x12x2,聲強325Wm2,入口壓力07MP,流量24mh,水溫25℃,經(jīng)過(guò)60min的處理,殺菌率最高84%。該系統有結構簡(jiǎn)單、堅固耐用、處理量大、耗能小等優(yōu)點(diǎn),具有工業(yè)化大規模的水處理的應用前景關(guān)解調:哨超聲殺富圖分類(lèi)號:TQ854文冪識碼:A在工業(yè)循環(huán)水系統中,由于水的不斷蒸發(fā)濃縮、物料泄露和適宜的水溫,造成了細菌的大量繁殖,而生物黏泥在設備上的附著(zhù)會(huì )嚴重影響設備運行效率,增加了設備能耗。目前國內通用的微生物控制方法主要是投加工業(yè)殺菌劑,這對人類(lèi)和環(huán)境水生物都有不同程度的毒性,因此環(huán)境友好型的殺菌方法成為目前究的熱點(diǎn)超聲殺菌是一種新型水處理技術(shù),根據超聲發(fā)生源的不同,目前主要有電功率超聲和機械式超聲田張帆等叫初步研究了電功率超聲處理循環(huán)冷卻水,通過(guò)實(shí)驗驗證了利用超聲殺菌有較好的滅菌效果。本研究主要探討機械式超聲滅菌方法,由于機械式超聲發(fā)生器結構簡(jiǎn)單、堅固耐用、處理量大、利用流程中的工業(yè)水泵提供超聲能量、耗能小和設備成本低等優(yōu)點(diǎn)國,適合工業(yè)上大規模運用作為超聲殺菌的方法1液哨結構液哨超聲發(fā)生器,又稱(chēng)簧片哨。液哨主要由噴嘴、噴距調節管和簧片組成,剖面結構圖見(jiàn)圖1。該發(fā)生器是通過(guò)噴嘴的高壓水流沖擊簧片,使得簧片產(chǎn)生振動(dòng),產(chǎn)生超聲波噴嘴截面圖噴嘴簧片噴距調節管簧片檐固定爆栓水流圖1液哨剖面圖Fig 1 Section iew of Reed wH中國煤化工CNMHG牧第日2011-209靠訂日舞201201-19作者筒介張陳成(1985),男,碩士研究生:呂效平(1950),男,教授,博士生導師,通訊聯(lián)系人, E-maiExpla@地dcm第28卷第1張陳成等.液哨超聲在循環(huán)水殺菌的應用2液哨殺菌機理當超聲波能量足夠大時(shí),就會(huì )產(chǎn)生“超聲空化”現象,主要是液體中的微小氣核在超聲波的作用下被激活,表現在泡核的振蕩、生長(cháng)、收縮、崩潰等一系列動(dòng)力學(xué)過(guò)程η。液體中的微小氣泡在超聲的作用下振動(dòng)、生長(cháng)并不斷聚集聲場(chǎng)能量,當能量達到某個(gè)值時(shí),空化氣泡急劇崩潰閉合,這時(shí)會(huì )釋放出巨大的能量,并產(chǎn)生高速強勁的微射流,使碰撞密度極高?？栈瘹馀菰诩眲”罎⒌乃查g產(chǎn)生局部高溫高壓(5000K1800MPa)。這些超聲波所攜帶的能量足以打開(kāi)結合強勁的化學(xué)鍵1明另外由于液哨中水流速度極快,也會(huì )產(chǎn)生“水力空化”現象ω,即水流內部形成空穴、空洞或空腔,當液體快速流動(dòng)時(shí),氣泡就會(huì )不斷的產(chǎn)生和潰滅,從而釋放能量,產(chǎn)生局部高溫高壓?？栈F象所產(chǎn)生的能量,可以對微生物細胞物質(zhì)產(chǎn)生損傷,破壞其細胞質(zhì)膜,從而導致細胞死亡12因而也就能達到殺菌的效果。3實(shí)驗部分31實(shí)驗條件氯化鈉(NaC):分析純,西隴化工股份有限公司;營(yíng)養肉湯:國藥集團化學(xué)試劑有限公司:污水:取自城市河流;精密電子天平:天津市天馬儀器廠(chǎng);液哨超聲發(fā)生器:自制;高壓滅菌鍋:浙江新豐醫療器械有限公司;水聽(tīng)器:型號CS3,中科院聲學(xué)研究所;示波器:江蘇揚中電子儀器廠(chǎng),型號SR8;菌落總數測試片:廣州綠洲生化科技有限公司。實(shí)驗使用自制的由液哨式超聲發(fā)生器組成的循環(huán)冷卻水殺菌系統,見(jiàn)圖2。其中簧片的主要幾何尺寸見(jiàn)表2,材料均為不銹鋼。測定表明,該液哨超聲發(fā)生器的入口水壓為08MPa時(shí),其流量最高為28mh殺菌實(shí)驗在盛有100L污水的水槽中進(jìn)行壓力長(cháng)片明]3泵循冷卻水中國煤化工CNMHG圖2循環(huán)冷卻水殺蔭系統Fig. 2 Cooling water disinfection system化學(xué)反應工程與工藝2012年02月裹2餐片的結構參數Table Smctural parameters of Reed whistleLength/mm22222024oooooooo032液哨性能參數測定選取表2中的各種簧片,通過(guò)調節閥門(mén)改變出水口處的壓力,將CS-3水聽(tīng)器直接放入液哨附近,另一端與示波器相連,讀取各個(gè)壓力下的振幅,利用下面公式求出聲強:isle/my式中:z為聲強,Wcm2;e為示波器顯示電壓幅值,V;m為換算系數,316,與探頭本身的物理性質(zhì)有關(guān);p為媒質(zhì)的密度,kgm3;c為媒質(zhì)中的聲速,m/s33殺菌實(shí)驗取一定量在一定條件下培養好的細菡倒入水槽中,加生理鹽水稀釋,水溫為26℃,調節液哨的性能參數3國,根據性能測試的結果,使其達到最佳狀態(tài),開(kāi)啟水泵,調節閥門(mén),使其水壓維持在07MPa運行60min。實(shí)驗前后每10min取一次水樣測其菌落總數通過(guò)菌落總數測試片測試實(shí)驗前后污水的細菌總數,殺菌率計數方法按下式w-w-×100%式中:所殺菌率;M,處理前菌落總數:M,處理后菌落總數。4結果與討論41簧片結構優(yōu)化4.1入口水壓、簧片厚度與聲強的關(guān)系對表2中9組簧片進(jìn)行逐測試,得出入口水壓、簧片厚度刈聲強的影響,見(jiàn)圖3(圖中結構參數表示為簧片厚度(mm)x簧片長(cháng)度(m)x噴距(mm))。取液哨簧片長(cháng)度為12mm,噴距為4mm,改變入口壓力,考察簧片厚度對液哨聲強的影響實(shí)驗過(guò)程中,當入口水壓為0IMPa和02MPa時(shí),未聽(tīng)見(jiàn)明顯的哨聲。這是因為入口壓力較小時(shí),水流沖擊簧片的力度很小,簧片的振動(dòng)很弱,幾乎沒(méi)有明顯的線(xiàn)狀譜。從04MPa開(kāi)始,開(kāi)始有一種較為尖銳的聲音。從實(shí)驗數據可以看出,隨著(zhù)水壓的增大,聲強逐漸變強,并在07MPa時(shí)達到最大。同時(shí)可以看出,簧片厚度為04mm和0.5mm時(shí),所得的聲強是比較大的,可以看出簧片的厚度會(huì )影響簧片的振動(dòng)快慢和振幅大小4.1.2入口水壓、簧片長(cháng)度與聲強的關(guān)系中國煤化工保持液哨簧片厚度以及噴距不變,改變液哨入口壓力,CNMHG的影響從圖4實(shí)驗數據可以看出,簧片長(cháng)度為12mm時(shí),所得到時(shí)強是比牧人時(shí),到25Wm2左右?？梢?jiàn)并不一定是長(cháng)度越長(cháng)或越短,產(chǎn)生的聲強越大,而是存在一個(gè)最佳點(diǎn)第28卷第1期張陳成等.液哨超聲在循環(huán)水殺菌的應用-01mnxmmx l4 emmx45m×1BmX40001020304050.070B00010203040506070809Hydraulic pressure/MPa圖3簧片厚度對聲強的彯響圖4簧片長(cháng)度對產(chǎn)強的影響Fig 3 Relationship between thickness and sound intensitFig 4 Relationship between length and sound intensity4.13入口水壓、噴距與聲強的關(guān)系保持液哨簧片厚度和長(cháng)度不變,逐步增加入口壓I mmx12 mmx力,考察噴距不同時(shí)對液哨聲強的影響。從實(shí)驗數據可以看出,隨若噴距改變,得到的聲強數據明顯變化,所以噴距對空化強度有一定的影量響。并且簧片到噴口之間距離達到2mm時(shí),所得的a5聲強數據是最大的。這主要是因為簧片越靠近噴口時(shí),水流沖擊簧片的力度就越大,簧片的振幅也就越大,振動(dòng)速度也越快。由圖5結果可知簧片結構參數圖5簧片到噴口的距離對聲強的影響為04mm×12mm×2mm時(shí)聲強最大。Fig5 Relationship between distance and sound intensity42殺菌實(shí)驗結果與討論421處理時(shí)間對殺菌效果的影響根據液哨最佳結構參數優(yōu)化的結果,選取兩種簧片,一種性能最好的簧片04mmx12mm×2mm,另外一種性能次好的簧片尺寸為05mmx12mmx2mm,進(jìn)行循環(huán)水殺菌實(shí)驗,其中被處理的污水量為80此時(shí)入口流量24mh、水壓07MPa,。實(shí)驗結果如圖6。從圖6中可以看出,液哨對循環(huán)冷卻水滅菌是有效的,滅菌率分別達到了70%和84%可以看出,結構參數最優(yōu)的液哨對循環(huán)水起到較好的滅菌效果5號蘇圖6處理時(shí)間對殺菌效果的能響Fig. 6 The effect of processing time on sterilization rate Fig.7 ThYH中國煤化工42.2溫度對滅菌效果的影響CNMHG考察溫度對滅菌效果的影響設置15、20、25以及30℃四種溫度選取結構參數為04mmx12mm×2mm7化學(xué)反應工程與工藝2012年02月的簧片,其中被處理的污水量為80L?？疾觳煌瑴囟葪l件下的滅菌效果,結果見(jiàn)圖7。圖中結果表明,溫度升高對細菌的滅菌效果都有明顯的提高實(shí)驗數據表明,溫度越高,滅菌率越高。當溫度分別為15、20、25和30℃時(shí),90min內,滅菌率分別為7%、82%、85%和83%。這主要是由于溫度升高將使液體的表面張力系數和粘滯系數下降,從而導致空化域值下降,使空化易于發(fā)生,但是并不是溫度越高越好,這是因為溫度升高,蒸汽壓將增大,使空化強度減弱。5結論a)根據液哨性能測試實(shí)驗的結果,液哨本身尺寸簧片長(cháng)度(mm)x簧片厚度(mm)×噴距(mm)為12mm×04mm×2mm時(shí),所得到的聲強是最高的,為325Wcm2。此時(shí)入口壓力07MPa,流量24m3hb)循環(huán)水最佳水溫為25℃,選取兩組簧片,其中一組簧片經(jīng)過(guò)性能測試,效果是最好的。殺菌處理60min,殺菌率分別是70%和84%。參考文獻應崇福超聲學(xué)0M北京科學(xué)出版社,1990495506團張帆呂效平韓萍芳,等超聲用于循環(huán)冷卻水火菌化工進(jìn)展20113071431-1434Zhang Fan, Lu Xiaoping, Han Pingfang, et al. 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Effect of hydrothermal treatment on the acidity and catEffects of the Impurities in LPG on H-ZSM-5 Catalyst for MTP ProcessGao Xiujuan, Chen Aiping?, Tong Shan, Li Debing2, Chen Yuanying Sun Xuguang, Mei Changsong'(1. Datang Inner Mongolia Duolun Coal Chemical Co, Ltd. Inner Mongolia 027300, China; 2. Datang Intemational ChemicalTechnology Research Institute Co, Ltd, Beijing 100070, China)Abstract: The homemade LPG contains trace amounts of impurities. Apparently, due to the contents of theies much higher than those of the impurities restricted by the Lurgi mTP(methanol to propylene)technology, the LPG can not be used as the substitute for the cycling hydrocarbons without any experimentalinvestigation. In this paper, the effects of the impurities in LPG on the structure and performance of H-ZSM-5catalyst for MTP process were investigated. The results of the performance test of H-ZSM-5 catalyst showed thatthe mTP catalyst exhibited a high activity, anti-coking capability, and regeneration property under the condition ofco-feeding with methanol and LPG ICP measurements showed that the deposition of impurities did not occur onthe catalysts. XRD tests suggested that the framework structure of the catalyst maintained well after repeatedreaction or regeneration. NHy-tpD characterizations showed that the amount of weak acid sites of the catalyst dnot change after reaction or regeneration. Therefore the homemade LPG can be verified as the substitute forcycling hydrocarbon of MTP process.Key words: Lurgi MTP process; H-ZSM-5 catalyst; LPG impurity; regeneration上接74頁(yè)Application of Liquid Whistle Ultrasonic Generatorfor Circulation Water SterilizationZhang Chencheng, Lu Xiaoping, Han PingfangNanjing University of Technology. College of Chemistry and Chemical Engineering Institute of Sonochemical Engineering.Nanjing 210009, China)Abstract: A new liquid whistle ultrasonic generator is studied. The sterilization experiments have been carried outwith this liquid whistle device, which use high-speed circulation water as a power source. We studied the effectsof different parameters, such as structure of reed whistle and the pressure of the circulating water, on sterilizationrate. The preferable structure of the reed whistle is 0.4 mmx12 mmx2 mm. The reed whistle operating conditionsshow as follows: 3.25 W/cm2sound intensity, 0.7 MPa water inlet pressure, 25 t water temperature and 2.4m /h water flow-rate for 60 min. Under these conditions the st中國煤化工‰ The generatorhas various advantages such as simple structure, fine sturdiness,CNMHGpacity as well aslow power consuming. Moreover, it is suitable for industrial applicauKey words: liquid whistle; ultrasound; sterilization