用褐铁矿制备聚硅氯化硫酸铁的研究

通过正交实验研究了用盐酸、硫酸、褐铁矿和硅酸钠制备聚硅氯化硫酸铁（PSFCS）絮凝剂的工艺条件。实验结果表明，浸取时间为2.5～3 h，浸取温度为110℃，硫酸浓度为6 mol/L，盐酸浓度为3 mol/L，质量液固比为4∶1，铁的浸出率可达95.7%～96.3%。溶液中加入少量聚乙烯醇作稳定剂，亚硝酸钠作氧化催化剂。PSFCS的合成条件：Fe/Si摩尔比为2，硅酸活化pH值为2，硅酸活化时间是30～40 min，陈化时间是2～2.5 h。与聚合硫酸铁（PFS）和聚合氯化铝（PAC）比较了处理印染废水的效果，表明PSFCS具有良好的絮凝性能，COD和浊度的去除率分别可达81.4%和96.1%。     

The influence on carbon,nitrogen recycling,and greenhouse gas emissions under different C/N ratios by black soldier fly

Environmental Science and Pollution Research - Currently, sustainable utilization, including recycling and valorization, is becoming increasingly popular in waste management. Black soldier fly...     

基于Logistic回归的林缘计划烧除气象条件判别分析

森林火灾是一种破坏性极强的灾害,它与农事活动以及气象条件密切相关,加强其预防与控制具有十分重要的作用和意义。根据2014年~2015年闽东屏南县进行的60次林缘计划烧除试验观测的主要气象要素数据(天晴日数、温度、湿度、风速),建立基于Logistic二元回归的林缘烧除气象条件判别模型进行检验和分析。结果表明,模型判别计划烧除成功与否的预报准确率高(91.7%),主要气象要素对林缘计划烧除成功与否发挥重要作用,其中连续晴天日数为最大影响因子,其次为风速。模型通过检验和验证结果显著,具有预报服务应用价值。     

改性硅藻土陶瓷生物膜载体的制备及性能研究

主要对硅藻土的烧结改性进行了进一步的研究,并对改性硅藻土用于污水处理系统生物膜的载体制作进行参数研究。通过设置适宜的污水水力学特性、良好的载体挂膜性能表征、实验运行稳定性等多方面进行对比实验,得出最佳生物膜挂膜性能的改性硅藻土陶瓷生物膜载体。     

用褐铁矿制备聚硅氯化硫酸铁的研究

通过正交实验研究了用盐酸、硫酸、褐铁矿和硅酸钠制备聚硅氯化硫酸铁（PSFCS）絮凝剂的工艺条件。实验结果表明,浸取时间为2.5-3 h,浸取温度为110℃,硫酸浓度为6 mol/L,盐酸浓度为3 mol/L,质量液固比为4∶1,铁的浸出率可达95.7%-96.3%。溶液中加入少量聚乙烯醇作稳定剂,亚硝酸钠作氧化催化剂。PSFCS的合成条件：Fe/Si摩尔比为2,硅酸活化pH值为2,硅酸活化时间是30-40 min,陈化时间是2-2.5 h。与聚合硫酸铁（PFS）和聚合氯化铝（PAC）比较了处理印染废水的效果,表明PSFCS具有良好的絮凝性能,COD和浊度的去除率分别可达81.4%和96.1%。     

Factors Influencing Farmers’ Willingness to Participate in the Conversion of Cultivated Land to Wetland Program in Sanjiang National Nature Reserve,China

Sanjiang National Nature Reserve (NNR) is a state-owned natural wetland in China that has suffered severe degradation due to cultivation and wetland reclamation by farmers. As a consequence, the conversion of cultivated land to wetlands (CCW) was proposed by the government of Heilongjiang province and the United Nations Development Programme/Global Environment Facility (UNDP/GEF) project team in 2007. We suggest that voluntary participation in the CCW could be an important tool for accomplishing the integrated objectives of wetland conservation and local development. The purpose of this study was to examine the main factors that influence farmers’ willingness to participate in the CCW through a field investigation and a questionnaire. Based on the data from our questionnaire, which provided an effective sample of 310 households in 11 villages, the influencing factors of farmers’ willingness to participate were analyzed through binary logistic regression analyses. It was concluded that age, education, the amount of cultivated land, geographical location, and the perceived benefits and risks were important factors for participation. Furthermore, suggestions for improving the wetland compensation system and providing alternative livelihoods are proposed to strengthen participation.     

Mechanistic insight into the biofilm formation and process performance of a passive aeration ditch (PAD) for decentralized wastewater treatment

• A Passive Aeration Ditch was developed to treat decentralized wastewater. • A model was developed to describe the process performance. • A high C/N ratio facilitates microbial growth but nitrification deteriorates. • A high salinity decreases both organic and nitrogen contaminants removal. Decentralized wastewater containing elevated salinity is an emerging threat to the local environment and sanitation in remote coastal communities. Regarding the cost and treatment efficiencies, we propose a passive aeration ditch (PAD) using non-woven polyester fabric as a feasible bubbleless aerator and biofilm carrier for wastewater treatment. Consideration has been first given to PAD’s efficacy in treating saline decentralized wastewater, and then to the impact of chemical oxygen demand-to-nitrogen (C/N) ratio and salinity on biofilm formation. A multispecies model incorporating the salinity effect has been developed to depict the system performance and predict the microbial community. Results showed that the PAD system had great capacity for pollutants removal. The biofilm thickness increased at a higher C/N ratio because of the boost of aerobic heterotrophs and denitrifying bacteria, which consequently improved the COD and total nitrogen removal. However, this led to the deterioration of ammonia removal. Moreover, while a higher salinity benefited the biofilm growth, the contaminant removal efficiencies decreased because the salinity inhibited the activity of aerobic heterotrophs and reduced the abundance of nitrifying bacteria inside the biofilm. Based on the model simulation, feed water with salinity below 2% and C/N ratio in a range of 1 to 3 forms a biofilm that can reach relatively high organic matter and ammonia removal. These findings not only show the feasibility of PAD in treatment of saline decentralized wastewater, but also offer a systematic strategy to predict and optimize the process performance.     

合成聚硅酸硼镁硫酸铁的正交实验研究

研究了用硅酸钠、硼砂、硫酸镁和硫酸铁为原料，制备聚硅酸硼镁硫酸铁（PSBMFS）混凝剂的方法及合成条件。通过正交实验，考查了硅酸活化pH值、缩聚反应时间和陈化时间等合成条件；同时考察了B/Si摩尔比、Mg/Si摩尔比和Fe/Si摩尔比等影响因素。结果表明：PSBMFS具有良好的混凝性能和脱色效果，能有效去除印染废水中的色度和COD，2种污染因子的去除率分别可达95.9%和67.9%。     

生态工业的建立和发展

党的十五大把环境保护问题作为基本国策,并强调:“正确处理经济发展同人口、资源、环境的关系”,这表明生态问题已经引起高度重视。建立和发展生态工业已成为当前一项重要任务,本文在介绍生态工业定义的基础上,说明了建立和发展生态工业的必要性及其如何建立和发展生态工业。     

专业大类招生环境下高职环境类专业人才培养模式的探索

在分析专业大类招生的特点及社会对环境类专业人才需求的基础上,提出了高职环境类专业进行专业大类招生的可行性,并以中国环境管理干部学院环境污染治理技术类专业为例,对专业大类招生环境条件下高职环境类专业"大平台教育、分方向培养、模块化管理"的培养模式进行了分析探讨。