园林绿化废弃物在污泥好氧发酵上的应用

园林绿化废弃物是一种绿色废弃物,由于其组成及结构的特殊性,园林绿化废弃物是作为污泥好氧发酵的良好结构剂调理剂,有着一定的优缺点,能够很好地提高堆肥效率。同时经过二次发酵堆肥腐熟后的物料,其品质优良,是作为生产有机肥的良好原材料,能够更好地提高作物产量与品质。     

Nitrification of fertilizer wastewaters in a biofilm reactor

The nitrification characteristics of fertilizer wastes were investigated in a biofilm system using a submerged aerated filter. The attachment of biomass on packing media was studied. Supplement of organic carbon in the form of glucose and yeast extract enhanced biofilm formation although the nitrifiers did not require organic carbon for growth. After an attachment period, continuous operation of the reactor at different loading rates and dissolved oxygen levels was investigated. The maximum achievable nitrification rate was strongly dependent on the dissolved oxygen. In the dissolved oxygen range of 3·2–3·5 mg dm⁻³, the maximum ammonia removal rate was about 0·17 kg NH₄ N m⁻³ day⁻¹. When the dissolved oxygen was increased to 4·9 mg dm⁻³, removal rates as high as 0·41 kg NH₄ N m⁻³ day⁻¹ could be obtained. Nitrite accumulation depended on the bulk nitrogen and dissolved oxygen concentrations.     

电气系统内部过电压引起低厂变烧坏事故解析

对某发电厂10kV电气系统在进行高压附机启停过程中,产生操作过电压,先后3次造成10kV/0.4kV的低厂变烧坏事故的原因进行了分析,并采取了相应的防范措施.     

影响复合酶去污力的因素

为研究复合酶对无磷洗衣粉去污力的影响,针对加酶浓度、洗涤温度、洗涤时间、水质硬度和pH值等不同条件进行了反复实验,不但得出了酶制剂对洗衣粉去污力具有明显影响的结论,还确定了影响复合酶去污力的几个具体因素,以用于指导加酶洗衣粉的生产实践.     

浅淡磷石膏的综合利用

简单介绍了磷石膏综合利用的几条途径．如制硫酸联产水泥、生产硫酸铵和硫酸钾、生产元素硫以及在农业上用作土壤改良剂、硫肥和钙肥等。指出生产厂应结合本厂和当地条件因地制宜地选择利用途径。     

Thermodynamics of metal reactants for ammonia synthesis from steam,nitrogen and biomass at atmospheric pressure

Catalytic ammonia synthesis at approximately 30 MPa and 800 K consumes about 5% of the global annual natural gas production causing significant CO₂ emissions. A conceptual solar thermochemical reaction cycle to produce NH₃ at near atmospheric pressure without natural gas is explored here and compared to solar thermochemical steam/air reforming to provide H₂ used in the Haber‐Bosch process for NH₃ synthesis. Mapping of Gibbs free energy planes quantifies the tradeoff between the yield of N₂ reduction via metal nitridation, and NH₃ liberation via steam hydrolysis vs. the temperatures required for reactant recovery from undesirably stable metal oxides. Equilibrium composition simulations suggest that reactants combining an ionic nitride‐forming element (e.g., Mg or Ce) with a transition metal (e.g., MgCr₂O₄, MgFe₂O₄, or MgMoO₄) may enable the concept near 0.1 MPa (at maximum 64 mol % yield of Mg₃N₂ through nitridation of MgFe₂O₄ at 1,300 K, and 72 mol % of the nitrogen in Mg₃N₂ as NH₃ during hydrolysis at 500 K). © 2011 American Institute of Chemical Engineers AIChE J, 58: 3203–3213, 2012     

平衡施肥理论与肥料高效利用

结合施肥实践阐述了平衡施肥原理中静态的横向平衡和动态的纵向平衡概念,并提出具有纵向平衡特点的速度复合型控释肥,其养分释放速度能与作物的养分需求基本一致,可显著提高肥料利用率和作物产量。     

中小型湿法磷酸和磷复肥装置技术进步综述

近16年来，我国的中小型湿法磷酸和磷复肥装置发展很快，针对湿法磷酸和磷复肥装置国产化技术，从工艺、单元操作及设备，以及粉状MAP、硫基NPK、尿基NPK和硝基NPK等方面进行了回顾，并对这些国产化技术的推广前景提出看法。     

微量元素的诊断与合理施用

介绍农作物缺乏微量元素的诊断方法以及微量元素肥料合理施用的措施。