本文關(guān)鍵詞： 沼液 SBR A/O 粉末活性炭 芬頓　出處：《北京化工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著畜禽養(yǎng)殖業(yè)的規(guī)�；l(fā)展,養(yǎng)豬場糞污經(jīng)厭氧消化后產(chǎn)生的沼液對(duì)周圍環(huán)境造成了嚴(yán)重污染。沼液具有高氨氮、難生物降解的特點(diǎn),直接采用常規(guī)的生物法,如SBR工藝、A/O工藝,難以達(dá)到穩(wěn)定的去除效果。根據(jù)處理目標(biāo)的差異,本文分別采取了生物法以及物理化學(xué)法對(duì)豬糞沼液的處理進(jìn)行研究。在常規(guī)SBR工藝的基礎(chǔ)上,分別向兩個(gè)SBR反應(yīng)器中投加椰殼粉末活性炭和煤基粉末活性炭,在進(jìn)水條件為COD:1000-1600mg/L氨氮：200-1000mg/L的情況下,運(yùn)行68d,COD的平均去除率為59.09%(1$反應(yīng)器)、53.13%(2#反應(yīng)器),優(yōu)于文獻(xiàn)中直接采取SBR工藝的處理效果；氨氮的平均去除率為36.08%(1#反應(yīng)器)、32.26%(2#反應(yīng)器),兩個(gè)反應(yīng)器對(duì)NH4+-N的去除效果較差,出水硝氮只在運(yùn)行初期和補(bǔ)充污泥時(shí)有較高的積累,主要原因是生物脫氮所需碳源嚴(yán)重不足,體系對(duì)高濃度NH4+-N(進(jìn)水中的平均含量為444mg/L)的進(jìn)水條件并不能適應(yīng),NH4+-N在水中解離生成的游離氨達(dá)到一定濃度時(shí)會(huì)影響硝化細(xì)菌的活性。A/O體系在進(jìn)水量為0.5 L/h,好氧池污泥負(fù)荷0.06 kg COD/(kg MLSS.d)的情況下,加入椰殼粉末活性炭后,好氧池對(duì)有機(jī)物的去除效率得到一定的改善,投加碳源對(duì)氨氮脫除的強(qiáng)化效果不明顯,至運(yùn)行后期去除率跌至20%以下；催化臭氧化預(yù)處理能夠有效改善A/O中好氧池COD去除率,且能在一定程度上穩(wěn)定出水水質(zhì),在80-104d好氧池出水有機(jī)物在1000mg/L上下小范圍波動(dòng),去除率約為50%。通過對(duì)芬頓試劑法降解沼液有機(jī)物的研究,分別進(jìn)行了單因素實(shí)驗(yàn)以及正交實(shí)驗(yàn),得出最佳的實(shí)驗(yàn)條件是H202與Fe2+摩爾比為6,反應(yīng)40min,pH=4。根據(jù)效應(yīng)曲線圖和正交實(shí)驗(yàn),進(jìn)行優(yōu)化驗(yàn)證試驗(yàn),芬頓試劑法對(duì)未經(jīng)絮凝的沼液原水的去除效果為87.43%,處理后COD:491.57mg/L通過靜態(tài)吸附實(shí)驗(yàn),用人造沸石對(duì)模擬廢水(NH4+-N含量1500mg/L)進(jìn)行影響因子的研究,即粒度、投加量、pH及初始NH4+-N含量等。根據(jù)不同濃度NH4+-N廢水的吸附實(shí)驗(yàn)數(shù)據(jù),分別擬合出了Langmuir、 Freundlich等溫吸附方程,兩個(gè)方程的R2均在0.99以上且Langmuir模型更符合人造沸石對(duì)445-1485 mg/L氨氮廢水的吸附規(guī)律,每克人造沸石可吸附28.32 mg NH4+-N;通過考察人造沸石對(duì)實(shí)際豬糞沼液的吸附隨著時(shí)間的變化,對(duì)數(shù)據(jù)進(jìn)行擬合分析后,準(zhǔn)二級(jí)動(dòng)力學(xué)能夠很好的描述人造沸石對(duì)豬糞沼液中NH4+-N的吸附行為(R20.99)。人造沸石吸附可脫除豬糞沼液中79.0%NH4+-N,處理后氨氮含量：333.92 mg/L,平衡吸附量：17.95 mg/g。對(duì)于不同的循環(huán)流速、循環(huán)時(shí)間、天然沸石粒徑以及投加量,在動(dòng)態(tài)條件下,考察了天然斜發(fā)沸石對(duì)豬糞沼液中NH4+-N的脫除情況。得出最佳的實(shí)驗(yàn)條件是循環(huán)反應(yīng)時(shí)間90min、流速18 mL/min、粒徑1-2 mm的天然斜發(fā)沸石250 g(水樣體積100 mL),在此實(shí)驗(yàn)條件下,可脫除豬糞沼液中23.99%的NH4+-N。
[Abstract]:With the large-scale development of livestock and poultry breeding, the biogas liquid produced by the anaerobic digestion of pig manure has caused serious pollution to the surrounding environment. The biogas liquid has the characteristics of high ammonia nitrogen and difficult biodegradation, so it adopts the conventional biological method directly. For example, SBR / A / O process is difficult to achieve stable removal effect. According to the difference of treatment objectives, this paper studies the treatment of pig manure biogas liquor by biological method and physicochemical method respectively. On the basis of the conventional SBR process, the treatment of pig manure biogas liquid is studied in this paper. Coconut shell powdered activated carbon and coal-based powdered activated carbon were added into two SBR reactors, respectively. Under the influent condition of COD:1000-1600mg/L ammonia nitrogen: 200-1000 mg / L, The average removal rate of SBR was 59.09 ~ (1 $) and 53.13 ~ (13) respectively, which was better than that of directly adopting SBR process in the literature, and the average removal rate of ammonia nitrogen was 36.08 ~ (th) ~ (th) ~ (32. 26) ~ (2) ~ (2) ~ (18) ~ (2) ~ (2) ~ (2). Nitrate in effluent only accumulated in the initial stage of operation and when the sludge was replenished, mainly due to the serious shortage of carbon sources required for biological denitrification. The influent condition of high concentration NH4 -N (the average content in influent is 444mg / L) can not adapt to the concentration of free ammonia produced by dissociation of NH _ 4-N in water, which will affect the activity of nitrifying bacteria. A- / O system can affect the activity of nitrifying bacteria at the influent rate of 0.5L / h, aerobic. Under the condition of sludge loading of 0.06 kg COD/(kg MLSS. D), After adding powdered activated carbon from coconut shell, the removal efficiency of organic matter in aerobic tank was improved to a certain extent, but the enhancement effect of adding carbon source to ammonia nitrogen removal was not obvious, and the removal rate dropped to below 20% at the later stage of operation. Catalytic ozonation pretreatment can effectively improve the COD removal rate of aerobic tank in A / O, and stabilize the effluent quality to a certain extent. The effluent organic matter fluctuates in a small range of 1000 mg / L at 80-104 d. The removal rate is about 50. Through the study on the degradation of organic matter in biogas liquid by Fenton reagent method, single factor experiment and orthogonal experiment were carried out. The optimum experimental conditions were as follows: the molar ratio of H 202 to Fe2 was 6, and the reaction time was 40 min, pH 4. According to the effect curve and orthogonal experiment, The optimal verification test was carried out. The removal efficiency of raw water from unflocculated biogas was 87.43 by Fenton reagent method. After treatment, COD:491.57mg/L was used to study the influence factors of NH _ 4-N content in simulated wastewater by static adsorption experiment with artificial zeolite, I. E. particle size. According to the experimental data of adsorption of NH4 -N wastewater with different concentrations, the isothermal adsorption equations of Langmuir and Freundlich were fitted respectively. The R2 of the two equations is above 0.99 and the Langmuir model is more consistent with the adsorption law of synthetic zeolite for 445-1485 mg/L ammonia-nitrogen wastewater, which can adsorb 28.32 mg NH4 -N per gram of artificial zeolite. After fitting and analyzing the data, The quasi-second-order kinetics can well describe the adsorption behavior of artificial zeolite for NH4 -N in pig manure biogas. The adsorption of artificial zeolite can remove 79.0 NH _ 4-N from pig manure biogas. After treatment, ammonia nitrogen content: 333.92 mg / L, equilibrium adsorption capacity: 17.95 mg / g 路g. Cycle time, particle size and dosage of natural zeolite, under dynamic conditions, The removal of NH4-N from pig manure biogas by natural clinoptilolite was investigated. The optimum experimental conditions were as follows: reaction time 90 min, flow rate 18 mL / min, diameter 1-2 mm, water volume 100mL ~ (-1). The NH4-N of 23.99% in pig manure biogas can be removed.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X713

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