改性硅藻土处理城市污水技术的可行性研究

文章分析了改性硅藻土处理城市污水技术的原理,指出改型硅藻土相对于一般的铝盐、铁盐等污水处理剂具有污水处理的效果稳定、产生二次污染少、可回收利用空间大、价格低廉等优点;并提出该技术的常规工艺流程和改进工艺流程,从而从理论上说明该技术在技术上是可行的。结果表明,该技术对COD和BOD5去除效率分别达到70%和73%左右,对SS和TP的去除率分别>94%和92%,从而进一步验证该技术的技术可行性。参照一般的化学强化一级处理技术的经济费用,分析了该技术在经济上的可行性。     

水体中重金属对人体健康影响的研究现状及对策

介绍水体中重金属对人体健康影响的研究现状，并提出了饮用水安全环境对策。     

好氧颗粒污泥颗粒化研究进展及发展趋势

综述了好氧颗粒污泥颗粒化研究进展，好氧颗粒污泥颗粒化的影响因素，分析了好氧颗粒污泥颗粒化研究中存在的问题，提出了研究的发展趋势。     

福建省沿海赤红壤区生态农业建设途径

通过种草、营林、治水和保土改善生态环境，逐步优化农业生产结构，建立高效种植业，提高耕地持久生产力，保护农业生物生产机能，开发果树生产，增强畜牧业，加工利用农副产品，解决农村生活能源，发展庭院生态经济等，探讨建设持续高效的农业生态系统，使沿海旱地农业得到整体发展。     

我国南方季节性干旱研究

分析了南方季节性干旱的特征、成因和抗旱体系。其特征是干旱出现的频率与强度加大，表土干旱和干热同步。成因是降水量、蒸发量年分布在时间序列上不同步；红壤调控供水力弱、有效水少和生物耗水多、供需矛盾突出。关键对策是建立开源节流为主体、降耗增效为两翼的抗旱技术体系。     

Web数据挖掘技术在远程教育中的应用

使用Web数据挖掘技术发挥网络教育中资源共享以及无时间局限性的优势,达到帮助学习者快速有效地寻找满足其个性需求的教学资源的目的,并且对其学习进程进行准确指导.     

黄铁矿晶体形态模拟实验研究

采用实验方法模拟金矿床成矿作用条件,研究水热体系黄铁矿各种晶体形态生成的物理化学条件,着重阐述黄铁矿的五角十二面体、八面体、立方体等晶形形成环境因素。实验成果有助于找矿矿物学、成因矿物学的发展和金矿的找矿和勘探。     

Rice mill waste as organic manure on a degraded Alfisol

In much of sub-Saharan Africa (SSA), the lack of organic soil amendments constitutes one of the principal causes for declining soil fertility in intensifying farming systems. The challenge, therefore, remains to increase the availability of organic inputs and to develop recommendations for their combination with inorganic fertilizers. An on-farm experiment was conducted in the northern Guinea savanna of Nigeria to evaluate the fertilizer effect of rice (Oryza sativa L.) mill waste (RMW) on a degraded Alfisol. The decomposition and nutrient (N and P) release patterns of RMW were studied using the litterbag technique, and the effect on maize yield and soil properties was determined. The RMW was applied at rates of 0, 5, 10, and 15 Mg DM ha⁻¹ and was applied either unburnt or burnt (farmers’ practice). In both years, compound fertilizer was broadcast during land preparation on all plots at rates of 40 kg N ha⁻¹, 17 kg P ha⁻¹, and 33 kg K ha⁻¹.Results obtained in the litterbag study showed that, at maize harvest, more than 90% of the P had been released from the decomposing RMW. However, around 60% of the organic C and 45% of the N still remained. Compared to the control treatment (0 Mg ha⁻¹ RMW), which yielded 0.55 Mg ha⁻¹, maize (Zea mays L.) grain yields were increased by 95% when 10 Mg ha⁻¹ of unburnt RMW was applied, and by 147% with 15 Mg ha⁻¹ (mean of 2 years). In contrast, burnt RMW did not result in significant yield increases. The cumulative application of 30 Mg ha⁻¹ of unburnt RMW significantly increased the soil organic carbon in the surface soil from 0.7% (0 Mg ha⁻¹ RMW) to 1.3%.The results of this investigation indicate that RMW constitutes a valuable organic input in the Guinea savanna if applied unburnt at rates of 10–15 Mg ha⁻¹ in combination with inorganic fertilizer. The repeated application of unburnt RMW may contribute to the rehabilitation of degraded soils through the buildup of soil organic matter.     

鹤岗市城市污水处理发展现状及对策探讨

从鹤岗市城市污水处理现状出发,依据中国城市污水处理发展目标,结合鹤岗市实际情况,对城市生活污水受到严重污染所带来的问题与危害和鹤岗市污水处理事业发展现状及面临的问题和障碍,进行了分析和论述,提出水污染防治及污水处理工程的必要性,并在此基础上对建设中小型污水处理设施的必要性和紧迫性进行探讨,以此加快城市化进程的全面发展.     

污水处理厂内毒物归宿模型的参数估计及应用

在建立城市污水处理厂毒物归宿模型的基础上，继续探讨了固液相吸附分配系数Ｋｐ，生物降解速率系数Ｋｂ，挥发及吹脱速率系数ＫｖＫｓｔ等模型参数的估计方法，并就模型的检验，模拟及其在风险评价中的应用作了案例研究。