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黄姜皂素废水是强酸性高浓度有机废水,它富含黄姜淀粉水解成的糖类.废水的直接排放严重污染附近的水源、影响水质,其环境污染问题在很大程度上已经制约了皂素产业的健康发展.本文对黄姜皂素的清洁生产工艺进行了系统的介绍,该工艺可变废为宝,减少环境污染.同时,指出清洁生产工艺存在的问题和今后的发展趋势. 相似文献
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为了对黄姜皂素产业主要生产工艺进行综合分析,找出最优生产工艺,建立了基于博弈论组合赋权的多准则妥协解排序(VIKOR)黄姜皂素生产工艺评价模型.首先,利用熵值法对原始数据进行分析,确定各评估准则的客观权重;然后,通过博弈论模型对主客观权重进行科学化组合,得到综合权重;最后,将该模型运用在黄姜皂素产业主要生产工艺的评价上,得到了4种生产工艺的综合排序.研究结果表明:博弈论组合赋权的VIKOR模型对4种生产工艺的评估结果与利用其他评估模型所得结果一致,该模型能全面考虑各项评估准则及评估对象与最优工艺和最劣工艺的关系,评估过程更为科学、完整;同时,其计算过程简洁,提高了评估效率. 相似文献
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《安全与环境工程》2018,(6)
以江苏省常州市某市政污水处理厂的污泥为原料,将十二烷基硫酸钠(SDS)作为添加剂,研究其对复合酶(碱性蛋白酶∶木瓜蛋白酶=4∶1)水解法提取剩余污泥蛋白质的促进作用,并根据前期试验结果,在确定液固比为5∶1和复合酶加酶量为5.23%的条件下,以剩余污泥蛋白质的提取率为指标,通过对SDS投加量、反应温度、初始pH值和反应时间因素进行单因素试验和响应面优化试验,确定SDS促进复合酶水解法提取剩余污泥蛋白质的最佳提取条件和各因素对SDS促进复合酶水解法提取剩余污泥蛋白质提取率的影响显著性大小。结果表明:最佳提取条件为液固比5∶1、复合酶加酶量5.23%、初始pH值7.4、反应温度56.9℃、反应时间2.6h、SDS投加量8.16%;在最佳提取条件下剩余污泥蛋白质提取率的最大值可达69.12%,比仅使用复合酶的提取率(60.83%)提高了8.29%;各因素对SDS促进复合酶水解法提取剩余污泥蛋白质的影响显著性由强至弱表现为反应温度初始pH值SDS添加量反应时间。 相似文献
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黄姜皂素清洁生产工艺污染物削减过程分析 总被引:4,自引:1,他引:3
采用黄姜皂素清洁生产新工艺可将吨皂素洗姜耗水量由传统工艺的800~900t降至90~100t,洗姜废水随之降低;采用多酶水解分离淀粉糖及水解原液回收盐酸与淀粉糖技术可将酸性废水发生量由传统工艺的400t酸性废水/t皂素、50~100kgCOD/t废水削减至110~120t废水/t皂素、20~30kgCOD/t废水,且废水的可生化性提高;分析整个工艺过程中酸性废水削减主要发生在多酶水解预分离淀粉过程;新工艺对抽余物进行资源化利用制备有型燃料,消除了抽余物任意堆放造成的污染,同时实现了资源的综合利用。 相似文献
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运用层次分析-灰色关联分析法评价了6种黄姜皂素生产工艺. 用层次分析法确定了12项指标〔酸耗系数、水耗系数、能耗系数、单位产品废水CODCr产生量、废气产生量、固体废物产生量、污染物处理效果、环保成本(年环境代价/产品年产量)、环境系数(年环境代价/年产值)、成本投资、运行费用和资源综合利用收益)〕的权重,其中水耗系数、废水CODCr产生量、酸耗系数的权重分别为0.216、0.189、0.167,排在前三位,对评价结果影响较大. 通过专家打分、构造决策矩阵等步骤计算不同工艺指标列与最优指标集数据列的关联度,得到6种生产工艺的综合排序. 微波破壁-甲醇提取法的关联度为0.879,为最优工艺;直接分离法、直接分离-板框压滤法、糖化-膜分离回收-酸水解法的关联度分别为0.874、0.803、0.701,依次位列微波破壁-甲醇提取法之后. 直接酸水解法、自然发酵-酸水解法的关联度分别为0.530、0.410,排在最后,建议淘汰. 评价结果可望为黄姜皂素行业的健康发展、水污染防治等方面提供一定依据. 相似文献
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《Journal of Cleaner Production》2008,16(10):1133-1137
Diosgenin (CAS number 512-04-9) production from Dioscorea zingiberensis is a very important industry in central-western China. However, treatment of the wastewater with COD up to 50,000 mg/L has been a formidable challenge for the sustainable development of diosgenin industry. A cleaner production process, called the saccharification–membrane retrieval–hydrolysis (SMRH) process, was proposed and pilot-tested by us. The new process combines traditional acid hydrolysis with enzyme hydrolysis and UF/NF technologies. It has two major advantages. (1) The starch in D. zingiberensis is degraded into low molecular weight soluble sugar which is separated and removed before acid hydrolysis of the residue. This prevents the soluble sugar from entering the wastewater; instead it can be utilized as a carbon source in the fermentation industries. (2) UF/NF membrane equipment separates the acid hydrolysis solution into three parts: (a) the colloid phase, (b) the acid solution and (c) the water. All of which can be used in this or in another industry. In this way, the new production process dramatically reduces the wastewater discharge and uses the sugar, acid, water and solid waste in other processes. 相似文献
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This study proposes a new approach for diosgenin production from Dioscorea zingiberensis C. H. Wright tubers with respect to resources utilization and clean production. This process consisted of two successive parts, i.e., recovery of starch from raw material, and microbial hydrolysis of the residue to produce diosgenin by Trichoderma reesei. In the first step, about 75.4% of hemicellulose and 98.0% of starch were removed from the tubers. In the second step, about 90.2% of diosgenin was released from saponins by T. reesei at 30 °C, at an aeration of 0.80 vvm and agitation rate of 300 rpm in a 5.0 L bioreactor. Significant reduction of pollutant production was detected by replacing the traditional approach with the proposed new method. About 99.2% of reducing sugar, 99.4% of chemical oxygen demand, 99.2% of total organic carbon, 100% of SO42?, and 100% of acid was reduced in the new processing wastewater. 相似文献
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《Journal of Cleaner Production》2008,16(5):591-597
The leather industry is a heavy pollution industry and looking for clean technology. The utilization of enzyme and ultrasound in the industry are potential eco-friendly technologies.Enzymes can degrade the untanned solid leather waste. According to our investigation, ultrasound (40 kHz, 0.64 W/cm2) has little effect on the activity of one alkaline protease from Bacillus licheniformis. It is the first time to use ultrasound to accelerate the enzymatic hydrolysis of the untanned solid leather waste. With the application of ultrasound, the value of kA for the enzymatic hydrolysis of the untanned solid leather waste increases 18% and KM is almost unchanged, compared with that obtained without ultrasound. Ultrasound improves the ultimate conversion ratio from 57.6% to 84.1%. The reason is that ultrasound can facilitate the protease through the pores of skin and impair the integrity of collagen. Amino acid analysis indicated that ultrasound can promote the breakdown of helical regions of collagen which are difficult to attack by proteases.In view of environment protection, the use of enzyme and ultrasound in combination is a promising clean technology for the disposal of the untanned solid leather waste. 相似文献
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采用络合萃取法处理金刚烷胺制药废水,考察了初始pH、络合剂种类、稀释剂配比、油/水相比和反应温度等对废水中金刚烷胺萃取效率的影响,并对萃取剂中金刚烷胺进行了反萃取分离回收. 结果表明:采用V(P204)〔P204为二(2-乙基己基磷酸)〕∶V(正辛醇)为3∶2的复配萃取剂处理金刚烷胺制药废水,在初始pH为8.0、油/水相比为1∶1和温度为25 ℃的条件下,能够去除废水中99.7%以上的金刚烷胺;在反萃取过程中,V(P204)∶V(正辛醇)为1∶4的复配萃取剂可以获得更高的反萃取效率,以1.0 mol/L的HCl溶液为反萃取剂,当油/水相比为1∶1时,可将51.7%的金刚烷胺从萃取剂中反萃分离,回收得到的金刚烷胺盐酸盐溶液可以回用到生产工艺中,P204-正辛醇复配萃取剂可在萃取和反萃取过程中多次重复使用. 相似文献
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Kinetics of enzymatic unhairing by protease in leather industry 总被引:2,自引:0,他引:2
In leather industry, unhairing is a heavy pollution operation. The conventional lime-sulfide process produces a large amount of sulfide which is toxic to health and difficult to dispose. Moreover, conventional lime-sulfide process leads to the destruction of the hair causing increased COD, BOD and TDS loads in the effluent. As an alternative method, enzymatic unhairing is a promising clean technology. The main utilized enzyme preparations are proteases.There are many reports about enzymatic unhairing, most of which are qualitative. The kinetics of enzymatic unhairing by protease was discussed in this article. It will provide useful information to enzymatic unhairing. In our research, by analysis of the concentrations of released total protein in enzyme bath during protease unhairing, the good linearity between released total protein and square root of time (min1/2) was obtained at the initial stage. The good linearity suggests that enzymatic unhairing by protease is a diffusion-controlled process at the initial stage. The analysis of kinetics of released saccharides also confirms the same conclusion. On the other hand, the same characteristics between the kinetics of released saccharides and that of released total protein further confirms that it is the hydrolysis of core protein by protease that leads to the degradation of proteoglycans and the release of protein and saccharides. However, in our tests, the kinetics of released collagen indicates that the injury to skin took place in 3-6 h. Therefore, it’s necessary to control the time of protease unhairing within an appropriate limit. 相似文献