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首页> 外文会议>Water Environment Federation 75th annual technical exhibition amp; conference (WEFTEC 2002) >CALIBRATION OF BIODEGRADATION RATE COEFFICIENTS FOR HAZARDOUS AIR POLLUTANTS IN AN INDUSTRIAL ROUGHING FILTER
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CALIBRATION OF BIODEGRADATION RATE COEFFICIENTS FOR HAZARDOUS AIR POLLUTANTS IN AN INDUSTRIAL ROUGHING FILTER

机译：工业粗滤器中有害空气污染物的生物降解率系数的标定

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Roughing trickling filters are used to reduce organic loadings ahead of the activated sludgernprocess at a Merck & Co. Inc. manufacturing site. The site is subject to the PharmaceuticalrnMACT (Maximum Achievable Control Technology) Rule, and must demonstrate requiredrnreductions of hazardous air pollutants (HAPs). TOXCHEM+ predictive fate software is used atrnthe site to estimate the reduction and removal of the HAPs during wastewater treatment. Sitespecificrnbiodegradation rates of the HAPs can be demonstrated as part of an overall strategy torndevise the best approach for achieving compliance with the MACT Rule. An experimentalrnsampling program of filter influent and effluent and exhaust air was completed over 2 days tornassess the fate of the HAPs in the process, and to estimate site-specific biodegradation raterncoefficients for the HAPs for use in the fate modeling software.rnIn each of 6 tests, mass balances for the organic compounds were constructed around therntrickling filter. The difference between calculated mass inputs and outputs was considered to bernthe mass of compound removed by biodegradation. Following tabulation of the removal of therncompounds by the principal fate mechanisms of stripping, effluent pass-through andrnbiodegradation, biodegradation rate coefficients were estimated using TOXCHEM+ for each test.rnThe estimated biorate coefficients were compared to those used in the software database. Thernbiorate coefficients of certain of the compounds were very similar in magnitude to the modelrndefaults (ethanol, acetonitrile, methyl ethyl ketone, hexane), while methanol was substantiallyrnlower, and toluene, triethylamine and i-propanol generally higher. The redox environment of therntrickling filter may be one reason why some estimated biorate coefficients deviate from therndefault aerobic biorate coefficient in the software database.rnUsing TOXCHEM+, the emission rates from the wastewater facility using only a single defaultrnbiodegradation rate for each compound, and using two biodegradation rate coefficientsrn(calibrated coefficient for the roughing filter, model default coefficient for the activated sludgernunit) were compared. The results showed that estimated emission rates were substantially lowerrn(e.g. 73 kg/d (161 lb/d)) using the dual biodegradation rate coefficient model, mostly due tornreduced emissions of toluene. The model also showed that the majority of the compound loadrnwas removed by the trickling filters, before the activated sludge tanks had any opportunity forrnremoval. The study indicated that model accuracy can be improved by calibration ofrnbiodegradation rates for HAPs and VOCs, and in using the dual biodegradation rate coefficientrnmodel for estimating emissions. Greater accuracy of emissions predictions makes the model a
机译：在Merck＆Co. Inc.制造基地，在活性污泥处理之前，使用粗滴滤池来减少有机负荷。该地点必须遵守《药品MACT（最大可实现控制技术）规则》，并且必须证明必须减少有害空气污染物（HAP）。现场使用TOXCHEM +预测性命运软件来估计废水处理过程中HAP的减少和去除。 HAPs的特定地点生物降解率可以证明是制定最佳方法以实现对MACT规则合规性的总体策略的一部分。在2天之内完成了一项过滤器进水，流出物和废气的实验性采样程序，以评估过程中HAP的命运，并估计用于命运模型软件的HAP的特定现场生物降解率rn。 ，在滴滤池周围建立了有机化合物的质量平衡。计算的质量输入和输出之间的差异被认为是通过生物降解去除的化合物的质量。在通过剥离，废水通过和生物降解的主要结局机制对有机化合物的去除进行制表之后，使用TOXCHEM +估算每个测试的生物降解率系数。将估计的生物率系数与软件数据库中使用的系数进行比较。某些化合物的生物速率系数与默认模型（乙醇，乙腈，甲乙酮，己烷）的值非常相似，而甲醇的值更低，而甲苯，三乙胺和异丙醇的值更高。滴滤过滤器的氧化还原环境可能是某些估算的生物速率系数与软件数据库中默认的有氧生物速率系数不同的原因之一。使用TOXCHEM +，废水设施的排放率仅对每种化合物使用单一的默认生物降解率，并使用两种生物降解比较速率系数rn（粗滤器的校准系数，活性污泥单元的模型默认系数）。结果表明，使用双重生物降解速率系数模型估算的排放速率大大降低（例如73 kg / d（161 lb / d）），这主要是由于甲苯排放量的减少。该模型还显示，在活性污泥罐有任何机会被去除之前，大多数复合负载物已由滴滤器去除。研究表明，通过校准HAP和VOC的生物降解率并使用双重生物降解率系数模型估算排放量可以提高模型的准确性。排放预测的更高准确性使该模型成为

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