Enhancing Phosphorous Recovery in a Novel Biofilter System

Developing new techniques to remove and recover phosphorous simultaneously from wastewaters is very important for sustainable utilization of phosphorous resource and prevention of eutrophication. The feasibility of phosphorus bioaccumulation in a novel continuous alternating anaerobic /aerobic biofilter and benefits of such accumulation for its further recovery as magnesium ammonia phosphate （MAP） were studied. The system was operated for seven months and employed the atomic absorption spectrophotometer （AAS） method to analyze the distribution change of magnesium and calcium with phosphate in the biofilter during that period. The benefits of utilizing the biofilter system to accumulate phosphorous ＆ magnesium and suppress calcium simultaneously to phosphorous recovery as MAP were explained with the aid of chemical equilibrium models. The improved phosphorus recovery from 42% to 82% was approved in the recovery experiments and the recovery products mainly as MAP were evidenced and characterized with scanning electron microscopy （SEM） . The study provides references for designing and operating the novel alternating anaerobic /aerobic biofilter for phosphorus bioaccumulation and recovery.     

干旱对鄱阳湖流域植被生态系统GEP的影响

总生态系统生产力GEP(gross ecosystem productivity),是生态系统固定的碳总量,作为碳循环研究的重要组成部分,有着不可估量的生态价值和极为重要的人文社会意义.在全球气候变暖背景下,干旱对陆地生态系统GEP造成了一定影响.该文以鄱阳湖流域为研究区,利用生态耦合模型估算2000—2016年间每月GEP,计算干旱指数SPI( standard precipitation index)探究干旱在时间和空间分布上对GEP的影响.通过对模型模拟的GEP与MODIS的GEP产品进行对比分析,发现两者具有较好的相关性,且在GEP低值区间两者表现几乎完全一致.研究结果表明,干旱对鄱阳湖流域植被生态系统GEP存在抑制效应,随着干旱程度的加剧,GEP显著减少;两者不仅在时间上存在一致协同变化趋势,在空间分布上也表现出强烈的一致性.通过该研究,有助于管理部门了解干旱对GEP产生影响的作用机制,为流域生态环境保护提供科学支撑.     

神经网络在非线性系统控制中的应用

以一个工程中实际的问题为例，具体介绍了MATLAB环境下神经网络技术在控制系统中的应用，并进行榜真实验，与采用其它控制器的仿真系统控制效果进行对比。     

Advanced Treatment of Wastewater and Slightly Deteriorated Raw Water by Biological Activated Carbon Method under Rich Oxygen Condition

Rich oxygen-biological activated carbon(RO-BAC)method developed from traditional BAC method is a sys-tem in which high pressure is applied to improve the oxy-gen concentration of the influent.Experiment withwastewater and the slightly deteriorated raw water showsthe system is an effective option for advanced treatmentof industry wastewater and pretreatment of slightly dete-riorated raw water.The experiment results and the in-fluential factors are discussed in this paper.     

Microbiological Characteristics of Anaerobic Granular Sludge in Hybrid Anaerobic Baffled Reactor

Anaerobic granular sludge is of key importance for highly effective operation of hybrid anaerobic baffled reactor (HABR).An observation and analysis on the composition of anaerobic granular sludge in each separation compartment of HABR was conducted by using scanning electron microscope (SEM)and molecular biotechnology,and specific methanogenic activity(SMA) and coenzyme F420 content were determined. It was indicated that the disparity of microbial composition was significant among these separation compartments of HABR,and the HABR encouraged phase separation.The results show the understanding of microbiological characteristics of anaerobic granular sludge in HABR is helpful for cultivating granular sludge, which ensures the effective operation of the reactor.     

成人网络教学中工科专业课程的教学设计——以“过程检测与仪表”为例

在成人教育中,网络教学可以帮助学习者解决工作与学习的矛盾,对于保障学习进程具有其独特的优势。网络化课程体系建设成为成人教育教学的有效途径。作为工科类专业课程的＂过程检测与仪表＂,是一门理论性和应用性相结合的课程。经过教学策略设计,利用网络平台和多媒体技术,采用启发式教学方法,可以把抽象的基本概念和原理等转化为直观、生动的多媒体信息,使复杂内容简单化、静态内容动态化,抽象内容形象化,从而改善了教学效果,提高了教学质量。     

基于共同作用的筏板基础分析

上部结构-基础-地基共同作用分析是一种基础结构设计方法，其理论与工程实践尚处在初级阶段。本文重点研究了空间框架-筏板-地基共同作用时筏板基础的受力和变形性能。并利用有限元方法完成三维模型的数值分析，结果表明。该方法是切实可行的，其运算结果令人满意，具有一定的实用价值。     

A Combined System for Biological Removal of Nitrogen and Carbon from Nylon-6 Production Wastewater

A combined system consisting of hydrolysisacidification, denitrification and nitrification reactors wasused to remove carbon and nitrogen from the nylon - 6production wastewater, which was characterized by goodbiodegradability and high nitrogen concentration. Theinfluences of Chemical Oxygen Demand(COD) in theinfluent, recirculation ratio, Hydraulic Residence Time(HRT) and Dissolved Oxygen(DO) concentration on thesystem performances were investigated. From results itcould be seen that good performances have been achievedduring the overall experiments periods, and COD, TotalNitrogen(TN), NH -N and Suspended Solids(SS) in theeffluent were 53, 16, 2 and 24 mg·L-1, respectively,which has satisfied the first standard of wastewaterdischarge established by Environmental Protection Agency(EPA) of China. Furthermore, results showed thatoperation factors, viz. COD in the influent, recirculationratio, HRT and DO concentration, all had importantinfluences on the system performances.     

Enriched Oxygen BAC Method in Advanced Treatment of Textile Dyeing-printing & Alkali-peeling Wastewater

IntroductionWith increasing application of polyester deweightingtechniques in Chinese textile plants , a great deal of alkali-peeling waste streams containing high strength recalcitrantorganic matters and waste alkali are discharged . Thesealkali-peeling waste streams are normally mixly treated withdying-printing wastewater by physi-chemical pretreat mentcombined with anaerobic-aerobic bio-treat ment processes .But effluents emitted by most textile plants in China areal ways beyond dischargin…     

玉米酒精糟毒素的微生物降解研究

研究旨在降解酒精糟中几种毒素(呕吐毒素、伏马菌素、黄曲霉毒素),为酒精糟制成饲料奠定基础。利用实验得到的一株能够很好降解玉米酒糟毒素菌种酵母19-1,以酒精糟和麸皮为发酵底物进行固态发酵,通过正交试验对固态发酵过程中添加的营养条件进行研究,测得发酵物毒素的含量,并通过重复最佳配方实验对结果进行验证。综合3种毒素测得情况,确定酵母19-1降解玉米酒精糟毒素的最优搭配组合为硫酸铵0%、水12 m L、硫酸镁0.015%、磷酸二氢钾0.05%、葡萄糖0%。