土壤有机质分组方法研究进展

土壤有机质(Soil Organic Matter,SOM)是陆地生态系统的重要组成成分,在陆地碳循环研究中有着重要作用。SOM与土壤物理、化学和生物性质密不可分,其组成、性质和转化一直受到人们的重视。由于SOM的组成、结构、存在方式的复杂性,对SOM的研究一直与其分组技术相联系。根据SOM分组技术所采用的原理和方法不同,主要分为化学分级、物理分级和生物学分级。最后指出土壤活性有机碳的物理分级将是今后研究的主要方向。

P3实验室的洁净空调设计问题及实例介绍

本文对P3级生物危险实验室的洁净和空调设计中存在的问题进行探讨。根据国际上有关国家的标准,结合中国国情对P3实验室的负压度、洁净度、回风型式及换气次数诸指标推荐了实用合理的设计参数范围并对—P3实验室的设计实例进行了介绍。本文对今后国内生物学危险实验室的洁净和空调设计将起到参考、借鉴的作用。

Degradation analysis of A^2/O combined with AgNO3 + K2FeO4 on coking wastewater

In this work, a coking wastewater was selected and a biochemical Az/O treatment device for fractional degradation was designed and employed. After each stage of the treatment, the products were analyzed through gas chromatography-mass spectroscopy （GC-MS） to determine their composition. Finally, AgNO3 ＋ K2FeO4 was used as an advanced deep catalytic oxidation treatment. It was concluded from the analysis that cyclic organics could be degraded and the chemical oxygen demand （COD） was controlled within 50 mg. L-1, in line with the target value, Meanwhile, the spectra obtained from the GC-MS were in accordance with the conclusions reached based on the COD. The research results showed that all hard-degradable organics in coking wastewater could be eliminated through the A2/O bio-membrane treatment and the advanced treatment of making use of K2FeO4 as an oxidant and Ag＋ as a catalyst, the catalytic efficiency with Ag＋ as a catalyst of K2FeO4 was very high. Ag＋ could evidently improve the oxidation capacity of K2FeO4 to wastewater in its short stability time, and this is an important innovation.

P3实验室洁净空调设计的若干问题

本文从我国实际状况入手,对我国试验室的负压率、洁净率、回风型、换气次数等主要技术指标进行了解析,并参照实际中合理的设计参数,结合实验室的工程设计案例,对我国生物危险试验室在空气洁净、空调设计等方面的主要问题进行了解析,并根据国内外相关国家的设计规范,加以了探讨。对未来中国生物危险实验室的空气洁净性与空调设计,有着一定的参考价值。