本文關(guān)鍵詞：氨吹脫—混凝處理奶牛養(yǎng)殖廢水厭氧出水的試驗(yàn)研究　出處：《安徽工業(yè)大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 奶牛養(yǎng)殖 沼液 UASB 氨吹脫 混凝

【摘要】：奶牛場(chǎng)廢水氨氮、有機(jī)物濃度高,經(jīng)過(guò)厭氧處理后,雖然大部分有機(jī)物得以去除,但氨氮濃度不降反升,碳氮比失調(diào),給后續(xù)好氧處理帶來(lái)困難,處理效果差,往往難以達(dá)標(biāo)排放,探索高效、適用的厭氧出水后續(xù)處理工藝具有重大的現(xiàn)實(shí)意義。本文針對(duì)奶牛場(chǎng)廢水厭氧出水的后續(xù)處理問(wèn)題,以馬鞍山蒙�，F(xiàn)代牧場(chǎng)廢水處理中的UASB出水為研究對(duì)象,進(jìn)行氨吹脫和混凝試驗(yàn)處理,試驗(yàn)過(guò)程中,采用單因素試驗(yàn)、響應(yīng)曲面試驗(yàn),分析了運(yùn)行參數(shù)對(duì)氨吹脫和混凝工藝對(duì)奶牛養(yǎng)殖場(chǎng)厭氧出水的處理的影響,以及各工藝參數(shù)之間的交互作用,確定了氨吹脫和混凝的最佳工藝條件,分別得出了以氨氮、CODCr以及SS去除率為響應(yīng)值的二次多項(xiàng)式回歸模型,為該組合工藝處理奶牛養(yǎng)殖廢水提供理論依據(jù)和基礎(chǔ)數(shù)據(jù),主要研究結(jié)論如下:(1)試驗(yàn)首先對(duì)UASB厭氧出水進(jìn)行氨吹脫處理單因素試驗(yàn),隨著吹脫時(shí)間的增加,氨氮去除率逐漸增加,5h以后變化均趨于平緩,且吹脫時(shí)間5-6h之間不存在顯著差異(P0.05),試驗(yàn)確定較佳的吹脫時(shí)間范圍為5-6h;氨氮去除率隨著pH值的增大逐漸升高,pH值大于11以后變化趨勢(shì)減緩,且pH值為11與12之間不存在顯著差異(P0.05),試驗(yàn)確定氨吹脫的較佳pH值范圍為11-12;氨氮去除率隨氣液比的增大而增大,當(dāng)氣液比為1000-3000時(shí),氨氮去除率較顯著增加(P0.01),而當(dāng)氣液比大于3000時(shí),氨氮去除率變化趨于平緩,試驗(yàn)確定的較佳氣液比范圍為3000-4000;氨氮去除率隨著溫度的升高而逐漸增加,溫度為10℃-30℃時(shí),氨氮去除率變化較顯著(P0.01),溫度繼續(xù)升高,氨氮去除率變化不大,試驗(yàn)確定適宜的吹脫水溫為30℃。(2)氨吹脫響應(yīng)曲面試驗(yàn)采用Box-Behnken設(shè)計(jì),建立了以氨氮去除率為響應(yīng)值的二次多項(xiàng)式回歸模型方程。對(duì)氨吹脫工藝參數(shù)的交互作用分析得出:pH值和吹脫時(shí)間以及吹脫時(shí)間和溫度的交互作用不顯著,pH值和溫度的交互作用顯著。對(duì)氨吹脫工藝進(jìn)行了優(yōu)化,得出優(yōu)化參數(shù):pH值為11.5,吹脫時(shí)間為5.3h,溫度為32.5℃。其對(duì)應(yīng)的響應(yīng)值所能取到的最大值為92.8%。(3)對(duì)氨吹脫出水進(jìn)行混凝單因素試驗(yàn),確定PFS為較優(yōu)的試驗(yàn)用絮凝劑。隨著PFS投加量的逐漸增加,CODCr和SS去除率呈現(xiàn)先升高后降低的趨勢(shì),具有顯著差異(P0.05);隨著攪拌速率的增大,CODCr和SS去除率呈先增大后減小的趨勢(shì),且有顯著差異(P0.05);隨著攪拌時(shí)間的增加,CODCr和SS去除率呈現(xiàn)先升高后逐漸降低的趨勢(shì),差異顯著(P0.05),當(dāng)攪拌時(shí)間為4、5min時(shí),其對(duì)應(yīng)的SS去除率相差不大;沉淀時(shí)間在5-20min,隨著沉降時(shí)間的延長(zhǎng),CODCr和SS去除率迅速增大,有顯著差異(P0.05),20min以后增幅明顯變小,無(wú)顯著差異(P0.05)。試驗(yàn)確定的PFS投加量、攪拌速率、攪拌時(shí)間、沉降時(shí)間分別為2.85g·L-1、180r·min-1、4-5min、20-25min。(4)采用Box-Behnken設(shè)計(jì)對(duì)混凝工藝進(jìn)行了響應(yīng)曲面試驗(yàn),分別以CODCr去除率和SS去除率為響應(yīng)值,建立了二次多項(xiàng)式回歸模型。并評(píng)價(jià)了混凝參數(shù)對(duì)響應(yīng)值的交互作用:對(duì)CODCr去除率,PFS投加量、攪拌速率、攪拌時(shí)間、沉降時(shí)間兩兩交互作用不顯著;對(duì)SS去除率,攪拌速率和沉降時(shí)間的交互作用顯著,其它參數(shù)之間的兩兩交互作用均不顯著。優(yōu)化試驗(yàn)得出混凝的優(yōu)化參數(shù):PFS投加量為2.75g·L-1,攪拌速率為180r·min-1,攪拌時(shí)間為4.4min,沉降時(shí)間為22.8min。此優(yōu)化參數(shù)下,CODCr去除率可達(dá)79.8%,SS去除率可達(dá)73.6%。(5)奶牛養(yǎng)殖廢水UASB出水經(jīng)吹脫和混凝處理后,出水CODCr、BOD5、SS、氨氮濃度達(dá)到《畜禽養(yǎng)殖業(yè)污染物排放標(biāo)準(zhǔn)》(GB18596-2001)。對(duì)組合工藝進(jìn)行經(jīng)濟(jì)可行性分析,吹脫和混凝水處理成本約為5.6元·(m3)-1。
[Abstract]:Dairy wastewater, high concentration of organic compounds, by anaerobic treatment, although removal can be most organic compounds, but the ammonia concentration did not fall but rise, carbon and nitrogen ratio, bring difficulties to the subsequent aerobic treatment, the treatment effect is poor, often difficult to discharge, to explore efficient, has great realistic significance for subsequent treatment of anaerobic effluent suitable for the process. The dairy processing wastewater anaerobic effluent, Ma'anshan Mengniu modern ranch in wastewater treatment UASB water as the research object, ammonia stripping and coagulation test, during the test, the single factor experiment, response surface test, analysis of the operation parameters on ammonia stripping and the coagulation process of dairy farm anaerobic effluent treatment effect, and interaction between various process parameters, to determine the optimum conditions of ammonia removal and coagulation, were obtained by ammonia nitrogen, CODCr And the SS removal rate as the response value of two order polynomial regression model, and provide a theoretical basis and basic data for the combined process for treatment of dairy wastewater, the main conclusions are as follows: (1) the first test of UASB anaerobic effluent ammonia stripping process of single factor test, with the increase of the time of blowing off, ammonia nitrogen removal rate increased gradually after the change, 5h tended to be stable, and there is no significant difference between the blow off time of 5-6h (P0.05), the test to determine the better stripping time range is 5-6h; the removal rate of ammonia nitrogen increased gradually with the increase of pH value, pH value is greater than 11 after the trend slowed down, for 11 and 12 and there is no significant difference between the value of pH (P0.05), the ammonia stripping test to determine the optimal pH value range is 11-12; the removal rate of ammonia nitrogen with the gas-liquid ratio increases when the gas-liquid ratio was 1000-3000, the removal rate of ammonia nitrogen was significantly increased (P0.01), and when the gas-liquid ratio is greater than 3000, The removal rate of ammonia nitrogen changes slowly, test the optimum gas-liquid ratio is in the range of 3000-4000; the removal rate of ammonia nitrogen increased gradually with increasing temperature, the temperature of 10 DEG -30 DEG C, the ammonia removal rate changes significantly (P0.01), the temperature continues to rise, the removal rate of ammonia nitrogen stripping test to determine the changes a little, the water temperature is 30 C is suitable. (2) ammonia stripping using Box-Behnken design response surface test, established on the ammonia nitrogen removal rate as the response value of the two polynomial regression equation. The interaction of ammonia removal process parameters obtained: pH value and stripping time and blow off the interaction of time and temperature is not significant. The interaction of temperature and pH value significantly. The ammonia stripping process was optimized, the optimized parameters are: pH value is 11.5, the stripping time is 5.3h, the temperature of 32.5 DEG. The corresponding response value of the maximum can reach to 92.8%. (3) of ammonia stripping The single factor test of mixed coagulation, PFS was determined to test the better with flocculant. With increasing dosage of PFS, CODCr and SS removal rate increased firstly and then decreased, with significant difference (P0.05); with the increase of stirring rate, CODCr and SS removal rate of the first increased and then decreased. The trend, and there is significant difference (P0.05); with the increase of stirring time, CODCr and SS removal rate increased firstly and then decreased gradually, significant difference (P0.05), when the stirring time was 4,5min, the removal rate of SS had little difference; precipitation in 5-20min, with prolonging the settling time. CODCr and SS removal rate increased rapidly, there was significant difference (P0.05), 20min increase significantly smaller, no significant difference (P0.05). Experimental determination of PFS dosage, stirring rate, stirring time and settling time were 2.85g, L-1180r, min-1,4-5min, 20-25min. (4) by Box-B The ehnken design of the response surface test of coagulation process, respectively, with CODCr removal rate and SS removal rate as the response value, established two polynomial regression model. And to evaluate the coagulation parameters on interaction response values: the removal rates of CODCr, PFS dosage, stirring rate, stirring time, settlement 22 there was no significant interaction; the removal rate of SS, the interaction of stirring rate and settling time was 22, the interaction between other parameters were not significant. The optimized parameters of the optimized coagulation test: PFS dosage was 2.75g - L-1, 180r - min-1 stirring rate, stirring time is 4.4min. The settlement time is 22.8min. the optimization parameters, the removal rate of CODCr was 79.8%, SS removal rate of 73.6%. (5) of cattle farm wastewater by air stripping and UASB effluent after coagulation treatment, the effluent CODCr, BOD5, SS, ammonia nitrogen concentration reached the "discharge standard of pollutants (> GB18596-2001). Economic feasibility analysis of combined process, the cost of stripping and coagulating water treatment is about 5.6 yuan (M3) -1..

【學(xué)位授予單位】：安徽工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：X713

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