發(fā)布時間：2018-01-24 17:35

  本文關(guān)鍵詞： 微藻 電絮凝 凈油機(jī) 城市污水　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：面對能源危機(jī)和環(huán)境污染的雙重威脅,利用城市污水培養(yǎng)微藻既能緩解能源危機(jī),又能為水處理提供新途徑。微藻能夠利用城市污水中的碳、氮、磷等有機(jī)污染物作為自身生長所必需的營養(yǎng)物質(zhì),從而達(dá)到去除水中污染物的目的;同時培養(yǎng)出來的微藻因?yàn)楹胸S富的油脂,可以作為生物柴油的原材料,又能起到緩解能源危機(jī)的目的。微藻收獲作為整個微藻生物柴油工藝中的關(guān)鍵環(huán)節(jié),卻因?yàn)槲⒃逯睆叫�、藻液濃度�?現(xiàn)有方法很難大規(guī)模應(yīng)用,成為整個工藝的限制步驟。本論文希望通過對電絮凝結(jié)合凈油機(jī)的新工藝進(jìn)行參數(shù)優(yōu)化,以期解決微藻收獲方法難以工業(yè)化應(yīng)用的難題。通過文獻(xiàn)調(diào)研和對課題組前期工作的總結(jié),確定了論文各部分的影響因素和考察指標(biāo)。論文第一部分對凈油機(jī)單獨(dú)收獲微藻工藝進(jìn)行單因子、多因子優(yōu)化;第二部分對電絮凝收獲微藻工藝進(jìn)行單因子、多因子優(yōu)化;最后再對組合工藝的采收效果和工業(yè)化前景進(jìn)行探索。電絮凝結(jié)合凈油機(jī)收獲微藻的方法是可行的,并優(yōu)化得到最佳工藝參數(shù),該工藝參數(shù)下的采收速率為0.7645 g/min、采收率為84.13%、濃縮倍數(shù)高達(dá)337.12倍,效果明顯。電絮凝結(jié)合凈油機(jī)收獲微藻工藝的最佳參數(shù)為:電絮凝部分—電極間距1 cm、電流密度0.0300 A/cm2、電解時間10 min、p H 5.5;凈油機(jī)部分—轉(zhuǎn)速28000 r/min、進(jìn)水流速57 L/h、藻液濃度1.2 g/L、p H 6.0。電絮凝結(jié)合凈油機(jī)收獲微藻工藝對油脂提取和所提取出的油脂成分均不會產(chǎn)生影響,證明該工藝在技術(shù)上可行。同時,成本分析也驗(yàn)證了組合工藝大規(guī)模工業(yè)化應(yīng)用的可能性。電絮凝結(jié)合凈油收獲微藻工藝每階段的出水水質(zhì)均達(dá)到《城鎮(zhèn)污水處理廠污染物排放標(biāo)準(zhǔn)》(GB18918-2002)一級排放標(biāo)準(zhǔn),部分指標(biāo)達(dá)到一級A排放標(biāo)準(zhǔn),證明微藻生物柴油工藝在緩解能源危機(jī)的同時可以為污水處理提供新的途徑。理論計算得到電絮凝的陽極(鋁電極)使用壽命為13.27 h,可以在最優(yōu)條件下進(jìn)行的電絮凝實(shí)驗(yàn)次數(shù)為80次。
[Abstract]:In the face of the dual threat of energy crisis and environmental pollution, using municipal sewage to cultivate microalgae can not only alleviate the energy crisis, but also provide a new way for water treatment. Microalgae can utilize carbon and nitrogen in municipal sewage. Phosphorus and other organic pollutants as the necessary nutrients for their own growth, so as to achieve the purpose of removing pollutants in water; The microalgae can be used as the raw material of biodiesel and can alleviate the energy crisis because of its rich oil. The microalgae harvest is the key link in the whole microalgae biodiesel process. However, because of the small diameter of microalgae and the low concentration of algae liquid, the existing methods are difficult to be applied on a large scale and become the limiting steps of the whole process. This paper hopes to optimize the parameters of the new process of electroflocculation combined with oil purifier. In order to solve the problem that microalgae harvesting method is difficult to be applied in industrialization. Through literature research and summary of the previous work of the research group. In the first part of the paper, the single factor and multi-factor optimization of microalgae harvesting process of oil purifier was carried out. In the second part, the single factor and multi-factor optimization of electroflocculation and harvesting of microalgae were carried out. Finally, the effect of the combined process and the prospect of industrialization were explored. The method of electroflocculation combined with oil purifier for microalgae harvesting was feasible, and the optimum technological parameters were obtained. The recovery rate is 0.7645 g / min, the recovery factor is 84.13 and the concentration multiple is 337.12 times. The optimum parameters of electrocoagulation combined with oil purifying machine for microalgae harvesting were as follows: electroflocculation part-electrode spacing 1 cm, current density 0.0300 A / cm 2, electrolysis time 10 min. PH5.5; Oil purifier part-rotational speed 28000 r / min, influent velocity 57 L / h, algae concentration 1.2 g / L. PH6.0. electroflocculation combined with oil purifying machine harvest microalgae process will not affect the oil extraction and extract oil components, it is proved that this process is technically feasible. At the same time. Cost analysis also verifies the possibility of large-scale industrial application of the combined process. The effluent quality of microalgae in each stage of electroflocculation combined with oil purification process is up to the pollutant discharge standard for municipal wastewater treatment plants (. First class emission standard (GB18918-2002). Some of the indicators meet the first A emission standard. It is proved that the microalgae biodiesel process can provide a new way for wastewater treatment while alleviating the energy crisis. The service life of the electroflocculating anode (aluminum electrode) is 13.27 h by theoretical calculation. The number of times of electroflocculation can be 80 times under the optimum conditions.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X703.1

【共引文獻(xiàn)】

相關(guān)期刊論文 前2條

1 張海陽;匡亞莉;林U，

本文編號：1460600