這里以水溶性強(qiáng)的多環(huán)芳烴——萘為研究對象，得出了萘的揮發(fā)模型和好氧微生物對萘的吸附模型。并對取自污泥進(jìn)行好氧培養(yǎng)和馴化，研究馴化后的好氧微生物對萘的降解動(dòng)力學(xué)。進(jìn)一步對馴化后的好氧微生物進(jìn)行分離，得到能夠高效降解萘的菌株，并對得到的純菌體進(jìn)行細(xì)胞固定化的研究。

Here, the highly water-soluble polycyclic aromatic hydrocarbon naphthalene is taken as the research object, and the volatilization model of naphthalene and the adsorption model of aerobic microorganisms on naphthalene have been obtained. And aerobic cultivation and domestication were conducted on sludge to study the degradation kinetics of naphthalene by domesticated aerobic microorganisms. Further isolation of domesticated aerobic microorganisms was carried out to obtain strains capable of efficiently degrading naphthalene, and cell immobilization of the obtained pure bacterial bodies was studied.

在本研究中，精萘廠家研究了萘在水中的揮發(fā)模型(無VSS存在)，結(jié)合試驗(yàn)數(shù)據(jù)和理論公式(Fick第一定律)得出水溶液中萘的傳質(zhì)系數(shù)k值為2.49×10-7m/s，而完全由經(jīng)驗(yàn)公式計(jì)算出的k值為2.538×10-6m/s，通過比較得出所使用模型的有效性;進(jìn)一步研究得出，當(dāng)萘溶液中VSS濃度為500mg/L時(shí)，水溶液中萘的傳質(zhì)系數(shù)k值為2.18×10-7m/s。

In this study, the refined naphthalene manufacturer studied the volatilization model of naphthalene in water (without the presence of VSS), and combined experimental data and theoretical formula (Fick's first law), obtained a mass transfer coefficient k value of 2.49 for naphthalene in aqueous solution × 10-7m/s, while the k value calculated entirely from empirical formulas is 2.538 × 10-6m/s, the effectiveness of the model used is determined through comparison; Further research has shown that when the concentration of VSS in naphthalene solution is 500mg/L, the mass transfer coefficient k value of naphthalene in aqueous solution is 2.18 × 10-7m/s.

通過吸附試驗(yàn)可知，馴化后的好氧活性污泥對水溶性萘的吸附在10分鐘即達(dá)到大吸附量，在60分鐘時(shí)達(dá)到吸附-解吸平衡。馴化后的微生物對萘的吸附等溫曲線符合langmuir吸附等溫式，同時(shí)也符合Frendlich吸附等溫式。

Through adsorption experiments, it can be seen that the domesticated aerobic activated sludge reaches a large adsorption capacity for water-soluble naphthalene in 10 minutes, and reaches an adsorption desorption equilibrium at 60 minutes. The adsorption isotherm curve of domesticated microorganisms for naphthalene follows the Langmuir adsorption isotherm equation and also conforms to the Frendlich adsorption isotherm equation.

進(jìn)一步研究可知，在酸性條件下，活性污泥對萘的吸附量較大，且pH值的變化對吸附量的影響不大;當(dāng)pH大于7時(shí)，活性污泥對萘的平衡吸附量隨著pH值的升高迅速降低。馴化后的好氧微生物對萘的降解符合一級反應(yīng)動(dòng)力學(xué)。

Further research shows that under acidic conditions, activated sludge has a larger adsorption capacity for naphthalene, and the change in pH value has little effect on the adsorption capacity; When the pH is greater than 7, the equilibrium adsorption capacity of naphthalene by activated sludge rapidly decreases with the increase of pH value. The degradation of naphthalene by domesticated aerobic microorganisms follows a first-order reaction kinetics.

在VSS=100mg/L和VSS=200mg/L兩種情況下，反應(yīng)速率常數(shù)分別為:0.0824h-1和0.1302h-1。對馴化后的活性污泥中的微生物進(jìn)行分離，得到兩株細(xì)菌，革蘭氏染色均呈陽性。

Under the conditions of VSS=100mg/L and VSS=200mg/L, the reaction Reaction rate constant are 0.0824h-1 and 0.1302h-1, respectively. Two strains of bacteria were isolated from the acclimated activated sludge and Gram stain was positive.

分別使用PVA-硼酸凝膠小球和PVA-硼酸-紗布復(fù)合載體兩種方法對微生物細(xì)胞進(jìn)行固定化的研究，按照它們對萘的降解速率由大到小的順序排列:自由菌紗布固定化細(xì)胞凝膠小球固定化細(xì)胞。

Two methods, PVA boric acid gel beads and PVA boric acid gauze composite carrier, were used to immobilize microbial cells. According to their degradation rate of naphthalene, they were arranged from high to low: free bacteria gauze immobilized cells gel beads immobilized cells.

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