| Because of residual antibiotics in the biopharmaceutical wastewater have strong inhibitory effect on microorganisms, making it difficult to directly on the biochemical treatment, therefore, it is essential to take effective pretreatment to damage or degradation of residual drug molecules and antibiotic activity for this wastewater, and improve the wastewater biodegradability, which favored the followed biochemical treatment. In this study, taking lincomycin production wastewater as the research object, in view of its specific characteristics and the engineering application, the pretreatment method of hydrolysis acidification was raised by the author. Observe the feasibility of hydrolytic acidification pretreatment of lincomycin wastewater and the effect of different factors on the wastewater hydrolytic acidification treatment, and targeted economic harmless material to strengthen the effect of hydrolysis acidification of the waste water treatment, at the same time, the effect of different biochemical treatment after pretreatment are studied, in order to provide certain theory for the practical engineering application and practical guidance.Hydrolytic acidification can be pretreatment of high-concentration lincomycin production wastewater. The experiment control reactor p H of 6, 7.5 and 9. Results show that the stable operation period, combined with the actual engineering application, the best removal efficiency of lincomycin wastewater hydrolytic acidification can be obtained when p H = 7.5, p H = 9 times, p H = 6 is the worst. The average COD removal rate is 11.5%, and the highest is 11.65%, under the condition of optimum p H(p H=7.5). The volatile acid(VFA) concentration of effluent and the acidification degree(AD) respectively stable tendency in 148.3~148.3 mmol/L and 148.3~12.6%, ORP stability around-200 m V, the B/C of the wastewater increased from 0.34 to 0.6. The COD removal efficiency of the subsequent biochemical treatment after hydrolysis acidification under the conditions of p H = 7.5 and 9 is better than p H = 6. However, because the quantity of adjusting p H is big when the effluent of p H = 9 hydrolytic acidification into the subsequent biochemical treatment. And the reagent consumption increases, higher cost, so comprehensive consideration, selecting the best p H = 7.5 in engineering application. And the best biochemical treatment process after hydrolysis acidification pretreatment for the lincomycin wastewater is anaerobic + aerobic stage, The total removal rate of COD is 83.63%.The COD removal efficiency of different influent COD concentration and reaction time on the hydrolysis acidification are studied. Results show that under the condition of optimum p H(7.5), early reactor operation, with the increase of influent COD concentration increase(17000~20748.8~24681.2mg/L), COD removal rate show a trend of falling after rising first(13~33.6~29.3%). But because of the accumulation of pharmaceutical wastewater toxicity, as well as the operation of the high concentration(23000mg/L above), COD removal rate decreased. Eventually the COD removal rate steady at around 11% when the microbes is balanced with the accumulation of toxic material in the reactor. With the increase of reaction time, because of the early adsorption effect, the COD removal rate increased rapidly in the reaction of the first 4 h, then increase slowly. The maximum COD removal rate is 14.9% when the hydraulic reaction time is 24 h. Therefore, optimal reaction time is 24 h.Zero-valent iron(ZVI) and biological fillers were added to strengthen the result of hydrolysis acidification of lincomycin wastewater treatment. The experiments are carried out in three reactors parallel in parallel: adding the zero-valent iron in the reactor(R1), adding the filler of bioreactors(R2), and a ordinary reactor(R0). According to the results of ZVI and biological fillers were added, which can improve the ability of the reactor anti water shock loading, and can significantly improve the processing effect of hydrolysis acidification reactor. During the period of stable operation, the COD removal rate, AD and the B/C of effluent of the reactor R1 and R2 are significantly higher than that of R0, ORP below R0. The B/C increase rate of R1 and R2 effluent is 68.38% and 57.83%, respectively, were significantly higher than that of R0(48.38%). The COD removal efficiency of the subsequent biochemical treatment after R1 and R2 stage are better than that of R0. And the best biochemical treatment process after hydrolysis acidification pretreatment for the lincomycin wastewater is anaerobic + aerobic stage, The total removal rate of COD is: R1, 98.69%; R2, 93.37%. Therefore, the ZVI and biological packing enhanced hydrolysis acidification, respectively, improved the wastewater biodegradability, to provide good conditions for the subsequent biochemical treatment, and improve the subsequent processing effect obviously. |
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