共查询到18条相似文献,搜索用时 62 毫秒
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中国磨芋胶资源丰富,在国产的27种磨芋中,有10种具有较大开发利用前景。磨芋可在我国大部分地区栽培,产量很高,磨芋胶被广泛应用于食品、纺织工业和其它行业中。本文对我国可作胶用的几种磨芋资源、分布和应用进行了报导。 相似文献
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珠江三角洲地区大气污染最明显的特点就是臭氧浓度的升高导致大气氧化性增强,而挥发性有机化合物(VOCs)和氮氧化物是大气臭氧生成的重要前体物。珠三角地区工业体系发达,VOCs的生产及使用企业众多,由于VOCs的种类繁多,性质各异,排放条件多样,目前已经形成了一系列的VOCs废气实用治理技术。 相似文献
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1前言我国沿海各省蕴藏着丰富的珊瑚资源,目前主要用于制作工艺品,尚有大量珊瑚未被充分利用。如能将珊瑚资源开发成一种新型钙质强化剂,必能造福于民。珊瑚是由腔肠动物珊瑚虫分泌的外骨骼沉积而成,其主要成分是碳酸钙,含量高达95%左右[1]。由于珊瑚来自生物体,因此不同于化学产品的纯碳酸钙,它还含有生命活动不可缺少的许多微量元素,其中含Na0.29%、Mg2.18%、K0.07%、P0.047%,而重金属As和Pb分别为1.4ppm和0.3ppm,均低于食品标准[2];此外,珊瑚还含有多种维生素(A、B、C、D、E、F等)和糖类(葡萄糖、果糖、… 相似文献
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简要介绍了清洁发展机制(CDM)及我国政府对推进CDM项目的要求,对国内外开展CDM项目的现状进行了简述。根据《京都议定书》要求及新疆的具体情况,分析了CDM在新疆的潜力,认为新疆开展CDM项目优先领域为:煤田灭火、提高能源效率、建筑节能、可再生能源利用、造林,以减排CO2为主;预计2008—2012年CO2减排量为1 785×104t,可带来8.9亿元~12.5亿元人民币的CERs收益,CDM项目潜力较大。在减排CO2同时,SO2、TSP排放量相应减少,从而促进大气环境质量的改善。 相似文献
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毛叶山桐子的人工培育困难,至今没有人工林地。本研究通过小型试验、扩大试验和工程化试验,对毛叶山桐子的育苗方法进行了系统研究,得出了毛叶山桐子育苗的最佳条件。 相似文献
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Md. Rezaul Karim Habibur Rahman Bejoy Khan Amimul Ahsan Md. Rahadujjaman Shadman Alam Rakibul Hasan Tabriz Tajwar Sharif Saad Farooq 《环境质量管理》2023,32(4):53-63
Potable and equitable drinking water (DW) is a fundamental human right and essential for human health. This study is conducted to assess the groundwater and jar water quality of the roadside restaurants and tea stalls used for drinking by the local people around the Gazipur City area in Bangladesh. Water samples from 173 restaurants and tea stalls are collected. The physico-chemical and biological parameters are analyzed according to the guidelines and standards. The results illustrate that the color, EC, and Mn of 41%, 80%, and 62% of the samples, respectively, exceed the WHO and Environmental Conservation Rules (ECR) standards. In addition, E. coli and total coliform exceeding the threshold standards are found in 47% and 64% of the water samples, respectively. The contamination of DW by fecal coliforms is confirmed and supported by prior studies, which indicates that the DW supplied in restaurants and tea stalls are unsafe because of the possible presence of pathogens. These may cause potential health hazards to consumers from various water-borne diseases. Poor sanitation, unhygienic practices, and improper disposal of wastewater are responsible for the microbial contamination of DW. So, the authorities in charge of these places should take the right regulatory steps, such as regular sanitation inspections, DW quality monitoring, hand-washing practices, and better sanitation in these places. 相似文献
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应用PE管微孔压滤技术,并辅以自然沉降、曝气、生物滤池等技术手段治理中药废水,出水达GB8978-88中的一级排放标准,并回收了约70%的水资源,文中的油污给PE管微孔压液技术带来的影响作了介绍。 相似文献
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The ability of free and polysulphone immobilized biomass of Arthrobacter sp. to remove Cu2+ ions from aqueous solution was studied in batch and continuous systems. The Langmuir and Freundlich isotherm models were applied to the data. The Langmuir isotherm model was found to fit the sorption data indicating that sorption was monolayer and uptake capacity (Qo) was 175.87 and 158.7 mg/g for free and immobilized biomass respectively at pH 5.0 and 30 °C temperature, which was also confirmed by a high correlation coefficient, a low RMSE and a low Chi-square value. A kinetic study was carried out with pseudo-first-order reaction and pseudo-second-order reaction equations and it was found that the Cu2+ uptake process followed the pseudo-second-order rate expression. The diffusivity of Cu2+ on immobilized beads increased (0.402 × 10−4 to 0.435 × 10−4 cm2/s) with increasing concentration from 50 to 150 mg/L. The maximum percentage Cu2+ removal (89.56%) and uptake (32.64 mg/g) were found at 3.5 mL/min and 20 cm bed height. In addition to this the Bed Depth Service Time (BDST) model was in good agreement with the experimental data with a high correlation coefficient (>0.995). Furthermore, sorption and desorption studies were also carried out which showed that polysulphone immobilized biomass could be reused for up to six sorption–desorption cycles. 相似文献