Streptomyces sp. WJS-825产谷氨酰胺转胺酶发酵条件优化及中试

应用五因子二次正交旋转回归试验设计,建立了微生物谷氨酰胺转胺酶 (TG)发酵生产过程中以酶活力和菌体细胞生长量作为目标函数的数学模型,并以此模型对链霉菌 (Streptomycessp. )WJS-825菌株发酵生产TG的培养条件进行优化,确定了影响TG生产的主要因子及其最适取值为多价胨 2. 1%、可溶性淀粉 1. 5%、初始pH 7. 0及培养温度 30℃.以该优化工艺条件进行了 5L发酵罐小试和 200L发酵规模的中试生产.结果表明,在中试发酵生产中使用以豆饼粉部分替代多价胨的经济性发酵优化培养基,以及发酵过程中在线监控pH、溶氧系数等多项发酵调控参数,并分段控制pH、温度、通气量和搅拌转速以及进行适时的流加补充碳源,该菌株生长繁殖能力强、产酶效果好,TG活性达 3. 2u/mL,而且连续重复的中试发酵生产试验的TG产量均稳定在 3. 2u/mL以上. 图 2表 3参 15     

新型聚铝硅复合絮凝剂的制备及性能研究

本文初步制备了两种新型聚铝硅复合絮凝剂：聚铝硅（含活化硅酸聚合铝，ＰＡＣＳｉ）和聚硅铝（聚硅酸硫酸铝，ＰＳｉＡＳ），研究对比了ＰＡＣＳｉ，ＰＳｉＡＳ与ＰＡＣ的絮凝性能。考察了硅酸聚合程度，硅、铝含量对其絮凝性能的影响，结果表明，提高硅酸聚合程度或硅、铝含量的增加均有利于增强絮凝性能，且随（Ｓｉ）／（Ａｌ）比值的提高，其絮凝性能也明显增加，在铝含量相同情况下，聚铝硅和聚硅铝的絮凝性能均优于聚合氯化铝     

桩基施工的安全隐患及预防控制措施

分析了目前全国桩基机械施工的现状、特点以及施工中一般常见的安全事故，并结合工作实际，从人、物、环境三个方面详细阐述了在桩基施工中存在的安全隐患。提出了应该采取的预防控制措施。     

建设项目环评中的清洁生产分析与评价

对清洁生产分析在建设项目环境影响评价中的作用进行评论述，提出七项清洁生产分析的内容、清洁生产评价的指标体系和定量评价方法。     

高效植物炭化炉是构筑循环经济的技术装备之一

高效植物炭化炉是将现代生物质资源通过热解,使资源得到充分利用,做到了清洁生产,实现了物质的反复循环,通过对副产品的进一步深加工,高效植物炭化炉成为制炭工业的最佳实用技术,是构成乡镇循环经济的技术装备之一.     

造纸行业环境影响评价中清洁生产评价的实践与思考

造纸行业是资金密集型、技术密集型产业，企业能耗、水耗、资源消耗很大。随着产品产量的增加，行业污染物排放重势必存在增长趋势，造纸行业清洁生产潜力巨大，造纸项目环境影响评价中的清洁生产水平评价变得越来越重要。就造纸行业环境影响评价中清洁生产水平评价的评价指标、评价方法、评价工作中遇到的实际问题以及当前形势对环境影响评价的更高要求以及应对办法等进行了论述。     

焦化生产中的清洁生产工艺与污染控制

本文阐述了焦化生产工艺的现状，指出目前焦化生产中污染治理技术存在的问题，探讨焦化清洁生产和污染物治理新技术。     

Cleaner industrial production practice in Ethiopia: problems and prospects

In this article, cleaner industrial production (CIP) from the Ethiopian perception, the conditions for implementation, the barriers encountered during implementation and the strategies used are discussed. In addition, the outcome of the project is highlighted.The barriers related to the implementation of Industrial CIP in Ethiopia are mainly due to:

• the lack of awareness on the part of the industrial sector;

• the lack of commitments from the high level management;

• the nature of the existing factories.

Cleaner production as a concept is not yet fully understood in Ethiopia and for this a vigorous awareness campaign has to continuously be conducted through all possible media. So far, awareness seminars, workshops and demonstration projects have been held and proved to be effective in facilitating the implementation of National Cleaner Industrial Production Project of Ethiopia (NACIPPE 1 and 2). It was, however, sad to note that at the time of the campaign, government promulgated a decree to the effect that state-owned factories were going to be privatized any time, which, to a considerable extent lowered the management's commitment towards the CIP projects.The first and second phases of NACIPPE 1 and 2 were implemented in 1997 and 1998 respectively. Forty industries from public and private sectors participated in the training and waste audit exercises and a total of 61 audit experts and 156 audit assistants were trained. The package was divided into three technical training components and three waste audit practices. The technical support was extended by hiring a private enterprise, Chem. Tech. Center Sh. Co.     

建设项目清洁生产能力评估方法

清洁生产能力评估将清洁生产概念引入建设项目环境影响评价，对实现经济与环境可持续发展具有重要意义。探讨清洁生产能力评估的必要性，可能性及方法，并对前景进行展望。