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11.
在调查了河北省多个观光农业园和参考相关资料的基础上,根据观光农业园的功能和景观特点,将河北省的观光农业园主要分为高科技综合型观光农业园、生态休闲度假型观光农业园和特色主题型观光农业园。并针对各观光农业园规划的现状,分析了存在的定位不合理、选址盲目、缺乏景观特色、环境污染严重、服务设施匮乏以及开放时间短等问题,并针对以上问题,提出了规划应合理定位、因地制宜、突出特色、建立节约型观光农业园等相应的对策。 相似文献
12.
A novel joint method of bioleaching with Fenton oxidation was applied to condition sewage sludge. The specific resistance to filtration (SRF) and moisture of sludge cake (MSC) were adopted to evaluate the improvement of sludge dewaterability. After 2-day bioleaching, the sludge pH dropped to about 2.5 which satisfied the acidic condition for Fenton oxidation. Meanwhile, the SRF declined from 6.45 × 1010 to 2.07 × 1010 s2/g, and MSC decreased from 91.42% to 87.66%. The bioleached sludge was further conditionedwith Fenton oxidation. From an economical point of view, the optimal dosages of H2O2 and Fe2+ were 0.12 and 0.036 mol/L, respectively, and the optimal reaction time was 60 min. Under optimal conditions, SRF, volatile solids reduction, and MSC were 3.43 × 108 s2/g, 36.93%, and 79.58%, respectively. The stability and settleability of sewage sludge were both improved significantly. Besides, the results indicated that bioleaching-Fenton oxidation was more efficient in dewatering the sewage sludge than traditional Fenton oxidation. The sludge conditioningmechanisms by bioleaching-Fenton oxidationmight mainly include the flocculation effects and the releases of extracellular polymeric substances-bound water and intercellular water. 相似文献
13.
Zhou Botian Shang Mingsheng Wang Guoyin Feng Li Shan Kun Liu Xiangnan Wu Ling Zhang Xuerui 《Environmental science and pollution research international》2017,24(23):19044-19056
Environmental Science and Pollution Research - Harmful cyanobacterial blooms are exemplified as a major environmental concern due to producing toxin, and have generated a serious threat to public... 相似文献
14.
野大豆为国家Ⅱ级重点保护野生植物,主要分布在东亚北回归线以北,多为零散分布,在育种、药用和食用、饲用等方面具有重要的应用价值。在中国环境管理干部学院北戴河新校区建设工地发现了连续分布面积达1 384 m2的野大豆种群,在国内尚属少见。为此,在综合分析的基础上建议在新校区内建立野大豆自然保护区,在保护这一宝贵植物资源的同时,也开创校园内建立自然保护区的先河。 相似文献
15.
简要介绍了废弃电器电子产品概况、相关法律法规以及基金补贴过程中审核产品数量的现实做法,指出了现有审核机制中存在的一些问题,并根据废弃电器电子产品资源化过程中对主要污染产物的重点监控,提出一种多级比对的处理数量审核方法。 相似文献
16.
秦皇岛海滨森林公园森林景观改造探讨 总被引:1,自引:0,他引:1
秦皇岛海滨森林公园是秦皇岛沿海防护林的重要组成部分,也是秦皇岛重要的城市森林公园之一。针对秦皇岛海滨森林公园阔叶树多、针叶树少、树种单一、林龄老化、景观单调的现状.探讨了森林公园景观改造的原则、措施和技术,并描绘了景观改造后的效果。 相似文献
17.
采用新型高效湿式脱硫除尘装置——螺旋式雾化脱硫除尘装置代替传统水沐式脱硫除尘装置,解决了某油田燃煤锅炉尾气中烟尘及SO2含量难以满足GB13271-2001《锅炉大气污染物排放标准》的问题。并在推广应用中不断摸索改进,引入钙-钠双碱法替代钠碱法,提出用锅炉废水替代清水加碱法方式,以废治废,有效节约成本的同时也大大减少了污水排放。 相似文献
18.
Changgeng Liu Panyue Zhang Chenghua Zeng Guangming Zeng Guoyin Xu Yi Huang 《环境科学学报(英文版)》2015,28(2):37-42
A novel joint method of bioleaching with Fenton oxidation was applied to condition sewage sludge. The specific resistance to filtration(SRF) and moisture of sludge cake(MSC) were adopted to evaluate the improvement of sludge dewaterability. After 2-day bioleaching, the sludge p H dropped to about 2.5 which satisfied the acidic condition for Fenton oxidation.Meanwhile, the SRF declined from 6.45 × 1010 to 2.07 × 1010s2/g, and MSC decreased from91.42% to 87.66%. The bioleached sludge was further conditioned with Fenton oxidation. From an economical point of view, the optimal dosages of H2O2 and Fe2+were 0.12 and 0.036 mol/L,respectively, and the optimal reaction time was 60 min. Under optimal conditions, SRF,volatile solids reduction, and MSC were 3.43 × 108s2/g, 36.93%, and 79.58%, respectively. The stability and settleability of sewage sludge were both improved significantly. Besides,the results indicated that bioleaching-Fenton oxidation was more efficient in dewatering the sewage sludge than traditional Fenton oxidation. The sludge conditioning mechanisms by bioleaching-Fenton oxidation might mainly include the flocculation effects and the releases of extracellular polymeric substances–bound water and intercellular water. 相似文献
19.
秦皇岛滨海地区可食用盐生植物存在蛋白质类、淀粉和糖类、油脂类、维生素类、菜用类5种主要类型,为秦皇岛地区盐生植物资源的开发利用创造了有利条件。影响盐生植物食用安全性的主要因素为盐生植物本身的化学成分危害、环境因素、销售环节的因素,通过分析介绍常见毒性的简易鉴别法和常用的除毒方法,提出选择合适的地点、不同类型盐生植物区分对待、食用要科学卫生、过敏体质宜食或不食等盐生植物的安全食用的可行性建议。 相似文献
20.
魏国印 《中国环境管理干部学院学报》2001,(2)
森林是生态系统的主体,森林资源是人类的宝贵财富和社会发展的基础。本文论述了森林可持续发展的重要意义,分析了秦皇岛森林资源现状,以及开发利用中存在的问题,探讨了秦皇岛森林资源可持续发展的对策。 相似文献