城镇污水处理厂供配电系统分析

污水处理已成为城市建设中必不可少的环节,所以对相应的配套工程也提出了更高的要求,本文将对污水处理厂的供配电系统进行简要的分析。     

Monitoring shrimp growth with control charts in aquaculture

This work proposes a method for the statistical monitoring of the weekly weight of shrimp in a fish farm. The design of control charts for shrimp growth presents several challenges, the main ones being the presence of trend and autocorrelation. Several control charts are proposed, the most efficient being a chart based on the residuals of a second order autoregression whose parameters vary with the week. A control chart with less computational complexity is also provided. It is simply based on growth rates and works well at detecting negative weight changes. Real data from a large shrimp farm has been used for both the design and the evaluation.     

哈密设施桃红蜘蛛的危害与防治

新疆哈密地区特有的环境条件为红蜘蛛的发生创造了强有力的生态环境,经多年的栽种经验,归纳总结了红蜘蛛的发生规律、造成的危害以及综合防治方法,有效的防治红蜘蛛的发生。     

新形势下创新农业科研单位公文处理工作

公文处理工作是农业科研单位行政管理的重要基础性工作,对农业科研单位科技创新和跨越式发展具有重要的现实意义。文章立足于新形势下农业科研单位公文处理工作实际情况,分析了目前公文处理工作存在的问题及主要原因,提出了提高认识、健全制度、强化队伍、严格审核和推进办公自动化建设等创新公文处理工作的建议。     

改性木屑处理含铬废水的研究

采用磷酸改性木屑后用于含铬废水吸附处理,探讨废水pH值、处理时间、木屑投加量、处理温度4个因素对铬去除率的影响;并拟合25℃改性木屑吸附处理含铬废水的动力学、等温线方程,估算热力学数据。结果表明:木屑对含铬废水有较强去除力,改性木屑去除力加强;改性木屑处理20ml浓度为50mg/L含铬废水的适宜条件为pH值=1～4,处理时间90min,木屑投加量1g,处理温度20～30℃;改性木屑吸附处理含铬废水的动力学特性符合颗粒内扩散方程和二级吸附速率方程;吸附等温线方程符合Langmuir吸附;25℃吸附过程ΔH=-20.489kJ/mol,ΔS=-78.426J/(mol.K),ΔG=2.89kJ/mol。     

乡镇污水处理厂运行管理相关问题探讨

乡镇污水处理厂作为环保基础设施建设的重点,普遍存在重建设轻运营的问题。笔者结合重庆市实际情况,重点分析了乡镇污水处理厂运行管理中存在的问题,并有针对性地提出了建议,包括提高收集率、完善末端工艺、专业化运营、改变考核体系、优化污泥处置、加强再生利用和远程在线监控等。     

Practical use of response surface methodology for optimization of veterinary antibiotic removal using UV/H2O2 process

Three of the most commonly used veterinary antibiotics—enrofloxacin (ENR), sulfamethoxazole (SMX), and oxytetracycline (OTC)—were chosen as representative antibiotics for UV/H₂O₂ treatments. The objective was to determine the optimization of UV/H₂O₂ to remove antibiotics from aquaculture discharge water using response surface methodology. The degradation of the antibiotics was investigated under varying UV/H₂O₂ conditions in environments with different levels of pH, water matrices, humic acid, and constituent ions. The degradation results demonstrated that increasing the H₂O₂ dosage facilitated ENR degradation at a neutral pH while facilitating degradation of SMX and OTC at a slightly acidic pH. The optimum removal conditions for ENR, which was used in all influential effect experiments and the contact tank experiments, was obtained at 10 mM H₂O₂, a pretreated COD of 87.51 mg L⁻¹, and an initial pH of 6.15. Among the tested anions, only the presence of Cl^- showed slight positive effects on ENR degradation, due to the generation of secondary active radicals. During the reaction, the hydroxyl radical (OH) was present at a higher pH while singlet oxygen (¹O₂) was slightly present at a lower pH. The experimental results from H₂O₂ sequential addition indicated that freshly added H₂O₂ could quench the recently generated OH and therefore a high H₂O₂ concentration with frequent adding was not necessary. Our contact system reduced the ENR concentration in both the effluent reservoir and in the UV irradiation zone. The overall results supported the use of the UV/H₂O₂ system to treat remnant antibiotics in the discharge water.     

油雾润滑技术在流程企业的应用

油雾润滑作为一种新型的机泵润滑方式，具有改善润滑效果、降低轴承故障率、减少润滑油消耗量和降低运行成本等优点，且已在国内外石油化工行业得到广泛应用。本文对油雾润滑系统的工作原理、油雾润滑与传统润滑的性能比较、油雾润滑系统的配置及油雾润滑技术的发展应用情况进行详细综述，并指出油雾润滑技术对装置规模大、集中程度高、人员配置少的生产装置具有很好的应用价值。     

鄂尔多斯市工业化进程中产业结构的演进分析

鄂尔多斯市是我国重要的能源重化工基地,因其工业经济呈现出超常规的发展态势,被称为鄂尔多斯现象。文中以鄂尔多斯市的工业经济和三次产业为研究对象,利用1949～2009年间的产值与就业结构统计数据,对其工业化进程与产业结构的变动轨迹进行了分析。结果表明:60a来,鄂尔多斯市工业化发展阶段性特征明显,目前其工业经济已进入重工业化的中后期阶段。三次产业中,第一产业的产值与就业比重快速下降,二、三产业比重持续上升,并行发展;就业结构虽逐年优化,但仍相对滞后于产业结构与工业化进程,产业结构与就业结构的协调度较低。近年来工业结构的重化趋势凸显,工业主导型的产业结构与主导产业群已经形成。     

油菜新品种宁杂1818氮肥运筹试验

以油菜(Brassica campestris L.)新品种宁杂1818为试验材料,以秦优7号为对照,研究不同氮肥运筹条件下,宁杂1818的植株长势和产量变化,旨在为深入了解宁杂1818的生长特性,建立宁杂1818高产、高效栽培技术体系提供理论依据。