仪器法测量水质COD的探讨

1前言 化学需氧量（简称COD）在环境监测中是评介地表水质量与废水排放是否符合排放标准的非常重要指标,是指水体中易被强氧化剂重铬酸钾氧化的还原性物质所消耗的氧化剂的量,以氧的mg／L来表示。由于水体受有机污染很普遍,因此,化学需氧量一般反映水体受有机物污染的程度。水和废水中化学需氧量测定基本分为重铬酸钾法和仪器法,两者都先经过加热消解处理,重铬酸钾法使用硫酸亚铁铵进行滴定测量,仪器法一般使用光度分析法进行测量（也可进行滴定操作）。     

CTL-12型COD测定仪快速测定废水中COD应用研究

采用CTL-12型化学需氧量测定仪测定废水COD,并与传统的重铬酸钾法比较。实验结果表明,该仪器适用于不同浓度废水COD的测定,准确、快速、简便。     

A-A/O法在焦化废水处理运行中的几个影响因素

一、简介A-A/O工艺原理A-A/O工艺,由三段生物处理装置组成,根据微生物存在的不同形式,A-A/O工艺又包含活性污泥法和生物膜法。该工艺将预处理的废水依次经过厌氧,缺氧和好氧三段处理,其特     

剩余污泥与粉煤灰协同处理印染废水实验研究

分析印染废水好氧生物处理工艺的剩余污泥作高浓度印染废水预处理的生物絮凝剂,并与粉煤灰协同作用的机理;对比不同实验条件下影响废水中化学需氧量、色度和悬浮物去除率的作用和因素;为减轻后续生化处理负荷、有效降低高浓度印染废水处理成本,探索废物资源化、以废物治理废水产业化的工艺设计方向和途径,提供合理的实验依据.     

毒死蜱缩合工艺废水中COD与TOC的相关性研究

针对毒死蜱缩合工艺过程的生产废水,采用重铬酸钾法测定其化学需氧量（COD）,采用燃烧氧化—非色散红外吸收法测量总有机碳TOC含量,并分析其相关性和ρ（COD）/ρ（TOC）值。结果表明,对于稳定水质的废水,COD与TOC有显著的相关性,但不同性质的废水,ρ（COD）/ρ（TOC）值差异很大;其值波动的主要原因是废水中有机成分的组成不同、存在还原性的非有机物及COD测定中氧化率不同。     

谈生物脱氮技术在焦化废水中的应用

焦化废水脱氮技术有物理化学法、生物化学法等.生物化学法是较为经济、实效、无污染转移、操作简便易掌握的典型工艺技术.生物脱氮是利用微生物的生物化学作用,将废水中的氨氮经硝化和反硝化反应,转变成为无害的氮气而除去.目前,国内焦化废水处理采用的生物化学脱氮工艺的主要流程有“缺氧一好氧(A—O)”法,以及在此工艺基础上开发的“厌氧-缺氧-好氧(A—A—O)”法.此外,“缺氧-好氧-好氧(A—O—O)”法也是“A-O”工艺的延伸,同属于以“缺氧-好氧”为基本流程的生物脱氮工艺.     

谈生物脱氮技术在焦化废水中的应用

焦化废水脱氮技术有物理化学法、生物化学法等.生物化学法是较为经济、实效、无污染转移、操作简便易掌握的典型工艺技术.生物脱氮是利用微生物的生物化学作用,将废水中的氨氮经硝化和反硝化反应,转变成为无害的氮气而除去.目前,国内焦化废水处理采用的生物化学脱氮工艺的主要流程有“缺氧—好氧(A—O)”法,以及在此工艺基础上开发的“厌氧—缺氧—好氧(A—A—O)”法.此外,“缺氧—好氧—好氧(A—O—O)”法也是“A—O”工艺的延伸,同属于以“缺氧-好氧”为基本流程的生物脱氮工艺.     

剩余污泥与粉煤灰协同处理印染废水实验研究

分析印染废水好氧生物处理工艺的剩余污泥作高浓度印染废水预处理的生物絮凝剂，并与粉煤灰协同作用的机理；对比不同实验条件下影响废水中化学需氧量、色度和悬浮物去除率的作用和因素；为减轻后续生化处理负荷、有效降低高浓度印染废水处理成本，探索废物资源化、以废物治理废水产业化的工艺设计方向和途径，提供合理的实验依据。     

昆钢推行清洁生产现状研究

推行清洁生产是企业实施可持续发展的必由之路,昆钢通过采取淘汰落后生产工艺,引进清洁生产设备等措施,在钢产量增加的情况下,主要污染物如烟粉尘、外排废水、废水中悬浮物、化学耗氧量、酚、氰等排放量分别下降50.17%,63%,79.3%,73.3%,86.3%,24.9%,实现了生产与环保协调发展。     

高浓度印染废水预处理试验及应用研究--利用剩余污泥协同粉煤灰作絮凝剂的试验

利用印染废水好氧生物处理工艺的剩余污泥，作高浓度印染废水预处理的生物絮凝剂，协同粉煤灰预处理高浓度印染废水，使废水中排放监控指标-色度、悬浮物（SS）和化学需氧量（CODcr）显著降低，为降低后续生化处理负荷、有效降低高浓度印染废水处理的运行成本，探索废物资源化、以废治废产业化的工艺设计方向和途径，提供确切的实验依据。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.