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由55株酵母选育出了2株耐酸性假丝酵母,摇瓶培养24h,味精废水pH从4.0回升至7.2,CODc ww 45000mg/L降至31000mg/L,去去除31%以上,得到生物量6.5克菌体dL废水,干酵母粉蛋白含量49.4%。 相似文献
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味精废水处理酵母的选育 总被引:1,自引:0,他引:1
由55株酵母选育出了2株耐酸性假丝酵母.摇瓶培养24h,味精废水pH从4.0回升至7.2,CODcr从45000mg/L降至31000mg/L,去除31%以上。得到生物量6.5g菌体/dL废水,干酵母粉蛋白含量49.4%。 相似文献
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酵母Candida krusei对合成染料的脱色 总被引:7,自引:1,他引:6
通过筛选实验,从土壤中新分离到1株对活性艳红K-2BP具有明显脱色效果的酵母菌株Y-G-I,经鉴定为克鲁斯假丝酵母Candida krusei.该菌株对含活性艳红K-2BP起始浓度为200mg/L的培养基,最大脱色率为99%,达到最大脱色率的时间是12h.克鲁斯假丝酵母的最佳接种量应不低于5%(体积分数),培养基最适pH在4~9之间,氮源(NH4)2S04浓度不低于0.1%,相对应的碳源葡萄糖浓度不低于0.5%.对脱色机理的研究表明,该菌株对活性艳红K-2BP的去除属于降解脱色.此外,该菌株对另外9种染料(50mg/L)的脱色率在62%~96%之间.其中,对偶氮染料弱酸艳红B、活性黑KN-B和活性红M-3BE的脱色率都达到了90%以上,对三苯甲烷染料(酸性媒介漂蓝B)的脱色率达到了93%.表明克鲁斯假丝酵母在染料废水的处理上可能具有较好地应用潜能. 相似文献
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镜检法测试矿粉颗粒度吴卓敏,徐龙弟上海港环保中心粒度分析方法很多,目前常用有:筛选法,离心沉降测定法,光散射法和显微镜法等.用显微镜测定粉尘的粒度和粒度分布,具有检测粒度范围广、操作简便、计算方法不复一杂、能直接看到粒子表观形状,还可拍照定样,分析结... 相似文献
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催化比色法测定水中微量碘化物 总被引:1,自引:0,他引:1
本文主要对催化比色法测定碘化物进行了研讨。在改进的实验条件下,作校准曲线以碘化物的含量对应logE0/E值,使其相关系数(r)从原来的0.99提高到0.999以上.方法的准确度,精密度大为提高,能满足环境水质分析中微量碘化物的测定要求。 相似文献
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从7个含酚废水生化处理厂的活性污泥或生物膜中分离出39株降解苯酚的酵母,它们均能以苯酚作为生长的唯一碳源,24小时内可将500ppm的苯酚去除90%以上。经鉴定,39株酵母分别属于两属三个种:热带假丝酵母(Candida tropicalis),皮状丝孢酵母(Trichosporon cutaneum)和乳头状丝孢酵母(Trichosporon capitatum)。不经诱导,在44—48小时内,热带假丝酵母314号最高生长的酚浓度和耐酚浓度分别约为1000ppm和1150ppm;皮状丝孢酵母25号约为800ppm和1000ppm;乳头状丝孢酵母115号约为750ppm和1450PPm。三种酵母在苯酚中生长的最适温度依次为30℃、25—30℃和25—36℃。它们生长的最适pH范围均为4.8—7.0。氰化物对这三种酵母的生长有明显的抑制作用。对含酚废水生化处理过程中的优势酵母等向题进行了讨论。 相似文献
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基于信息筛选和拉依达准则识别地下水主要组分水化学异常的方法研究 总被引:3,自引:0,他引:3
地下水水化学组分的异常值识别是获取水化学背景值的重要的一环,以往提出的基于水化学各组分内在联系的计算背景值的水化学图法及Durov图法在柳江盆地的研究中均取得了良好的效果,但是水化学图法的计算步骤繁多,过程复杂,对采样精度要求严格.因此,为简化计算过程,快速识别异常,本文借鉴英国地调局识别异常的方法,以沙颍河流域为研究区,针对该区浅层地下水水质资料,利用信息筛选法替代水化学图法,对研究区内水化学主要组分进行异常识别,并将不同识别方法的识别效果进行对比分析.结果表明,尽管存在两种方法单独识别出的异常数据较多,但是水化学图法+拉依达准则和信息筛选法+拉依达准则对地下水主要组分的异常识别效果均较好,异常识别后的剩余数据的阈值范围较为一致,信息筛选法能够在大尺度区域内精度较低条件下,有效地替代水化学图法快速识别出异常值. 相似文献
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啤酒废酵母的综合利用 总被引:6,自引:0,他引:6
啤酒废酵母含有丰富的营养物质,许多啤酒厂并没有充分利用,而是作为废弃物排入啤酒废水,增加了啤酒废水的处理负荷和难度。针对这种情况,我们利用本厂啤酒废酵母进行了生产酵母抽提物及营养酱油的研究,取得了满意的效果。不仅获得了优质产品,而且大大降低了啤酒酵母的污染负荷。 相似文献
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北京市实时尾气数据收集的探索与实践 总被引:9,自引:0,他引:9
介绍了在利用OEM技术采集北京市道路实时机动车排放数据的过程中总结出的实验方法,以及如何对收集到的尾气数据进行筛选,去冗和分析的过程。同时,对实验中可能会面临的一些问题作了说明并提供了解决途径,最后以数据实例给出了单车排放因子及分布规律。 相似文献
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Since its inception, the 316(b) assessment process has undergone considerable evolution and refinement. In this paper, the authors review and discuss this evolutionary process focusing on several key scientific findings. Among these are that the potential for adverse environmental impact is relatively low for many ecosystem components (e.g., phytoplankton, microzooplankton); that the survival of entrained organisms is often quite high; that the prediction of adverse environmental impact is hampered by the present inability to effectively quantify compensatory processes; and that subsequent monitoring has revealed that the dire population consequences originally predicted for several aquatic populations have not been borne out. While this evolution has resulted in less divergence in the estimates of cooling water-related losses between the regulatory and regulated communities, accurate determination of the population level consequences of such losses remains elusive. This uncertainty makes final resolution of 316(b)-related issues difficult. To address these difficult issues, we propose an assessment approach based on an ecological risk framework coupled with adaptive resource management. This approach begins with a screening process which helps to focus the assessment on the key resources at risk, followed by a “weight-of-evidence” evaluation of all relevant predictive and retrospective information, and concludes with an evaluation of the relative cost and benefits of intake alternatives and the need for additional monitoring. Such an approach has been successfully employed at several large-scale 316(b) assessments completed in recent years and provides a mechanism for dealing with uncertainties in the assessment process, while at the same time ensuring reasonable protection of the environment. 相似文献
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针对制糖生产用水存在的问题,提出了制糖生产零取水零排放的技术方案及工艺组成。其核心技术经试验和工程实践证明是合理、有效的,具有技术先进性和推广性。 相似文献
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Maryam Ghiasi Christine Armour Mark Walker Nicole Shaver Alexandria Bennett Julian Little 《黑龙江环境通报》2023,43(1):62-71
In recent years, as the implementation and use of Non-Invasive Prenatal Testing (NIPT) have increased, the cost of the test has been decreasing. The cost of NIPT is expected to fall further in the upcoming years. As a result of the decreasing cost of NIPT, many jurisdictions may change their prenatal screening policies toward abandoning serum-based screening and instead, implement and support NIPT as the first-tier screening for all women. There are several concerns in replacing first-trimester screening with NIPT. In this scoping review, we aimed to map the existing knowledge about possible issues in the systematic implementation of NIPT as the primary method of first-tier screening and to assess if any jurisdiction has altered its policy and discontinued serum-based prenatal screening in exchange for NIPT. The Medline database (Ovid) and Google Scholar was searched and all the studies discussing, investigating, or reporting on the systematic implementation of NIPT as the primary method of first-tier screening were included. All the studies went through a two-stage screening process and included full-text articles were reviewed. We did not find any articles indicating a country or region that replaced traditional prenatal screening by NIPT. The included articles were charted, and the data about the possible issues in the systematic implementation of NIPT as the primary method of first-tier screening are summarized narratively and presented in tables in four categories. The findings of this scoping review may be informative for stakeholders and policymakers regarding recent changes in NIPT implementation policies around the world and may aid with developing policy for NIPT implementation with a broader perspective. 相似文献