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环境工程专业英语(钟理编)英语全文

环境工程专业英语(钟理编)英语全文
环境工程专业英语(钟理编)英语全文

Unit 13

Text: Water Treatment Processes

One of the great achievements of modern technology has been to drastically reduce the incidence of waterborne of diseases such as cholera and typhoid fever. These diseases are no longer the great risks to pubic health that they once were. The key to this advance was the recognition that contamination of pubic water supplies by human wastes was the main source ci infection, and that it could be eliminated by more effective water treatment and better waste disposal.

Tod ay’s water treatment plants are designed to provide water continuously that meets drinking water standards at the tap. There are four main considerations involved in accomplishing this1 source selection, protection of water quality, treatment methods to be used, and prevention of recontamination. Common precautions to prevent groundwater and surface water pollution include prohibiting the discharge of sanitary and storm sewers close to the water reservoir, installing fences to prevent pollution from recreational uses of water, and restrictions on the application of fertilizers and pesticides in areas that drain to the reservoir.

Screening, coagulation/flocculation, sedimentation, filtration. and disinfection are the main unit operations involved in the treatment of surface water. Water treatment operationa fulfill one or more of three key tasks1 removal of particulate substances such aa sand and clay, organic matter, bacteria, and algae; removal of dissolved substances such as those causing color and hardness; and removal or destruction of pathogenic bacteria and viruses. The actual selection of treatment processes depends on the type of water source and the desired water quality.

Occasionally, raw water with low turbidity can be treated by plain sedimentation (no chemicals) to remove larger particles and then filtration to remove the few particles that failed to settle out. Usually, however, particles in the raw water are too small to be removed in a reasonably short time through sedimentation and simple filtration alone. To remedy this, a chemical is added to coagulate/flocculate the small particles, called colloids, into large ones, which can then be settled out in sedimentation tanks or removed directly in filters.

Removal of Particulate Matter

The unit operations employed for the removal of particulate matter from water include screening, sedimentation, coagulation/flocculation, and filtration.

Screening to remove large solids such as logs, branches, rags, and small fish is the first stage in the treatment of water. Allowing such debris into the treatment plant could damage pumps and clog pipes and channels. For the same reasons, water intakes are located below the surface of the lake or river in order to exclude floating objects and minimize physical damage from ice.

Sedimentation, the oldest and moat widely used form of water and wastewater treatment, uses gravity settling to remove particles from water. It is relatively simple and inexpensive and can be implemented in basins that are round, square, or rectangular. As noted earlier, sedimentation may follow coagulation and flocculation (for highly turbid water) or be omitted entirely (with moderately turbid water) .Particulates suspended in surface water can range in size from 10-1 to 10-7mm in diameter, the size of fine sand and small clay particles, respectively. Turbidity or cloudiness in water is caused by those particles larger than 10 mm, while particles smaller than 10 mm contribute to the color and taste.

Coagulation/flocculation is a chemical-physical procedure whereby particles too small for practical removal by plain sedimentation are destabilized sod clustered together for faster settling?. A significant percentage of particulates suspended in water are so small that settling to the bottom of a tank would take days or weeks. These colloidal particles would never settle by plain sedimentation.

Coagulation is s chemical process used to destabilize colloidal particles. The exact mechanism is not well understood, but the general ides is to add a chemical which has positively charged colloids to water containing negatively charged colloids. This will neutralize the negative change on the colloids and thus reduce the tendency for the colloids to repel each other. Rapid mixing for a few seconds is required to disperse the coagulant. Gentle mixing, called flocculation, of the suspension is then undertaken to promote particle contact. This is achieved by mechanical mixing through the use of slowly rotating paddles inside the coagulation/flocculation tank, or by hydraulic mixing which occurs when flow is directed over and around baffles in the tank. Detention time in the coagulation/flocculation tank is usually between 20—40 minutes in tanks 3—4m deep. Through the combined chemical/physical process of coagulation/flocculation, the colloidal particles which would not settle out by plain sedimentation are agglomerated to form larger solids called floe. These appear as fluffy growths of irregular shape that are able to entrap small noncoagulaed particles when settling downward. Aluminum sulfate is the most common coagulant but organic polymers may also be used alone or in combination with alum to improve flocculation. The floe suspension is gently transferred from the coagulation/flocculation tanks to settling tanks, or directly to filters where the floes are removed.

Disinfection

To ensure that water is free of harmful bacteria it is necessary to disinfect it. Chlorination? is the most common method of disinfecting public water supplies. Sufficient quantities of chlorine from chlorine gas or hypochlorites are added to treated water to kill pathogenic bacteria. Chlorination is a reliable, relatively inexpensive, and easy disinfection method to use. Other disinfectants include chloramines, chlorine dioxide, other halogens, ozone, ultraviolet light, and high temperature. Ozonation, which has been used extensively in France, is now gaining acceptance in North America, especially as an alternative to prechlorination where natural organics are present. Although effective, ozone does not leave a lasting residual for long-term disinfection.

Ozoanation is the disinfection of water by adding ozone, which is a powerful oxidant of inorganic and organic impurities. Its advantages over chlorine are that it leaves no tastes or odors, and unlike chlorine, it apparently does not react with natural organics to form compounds hazardous to humans.

Removal of Dissolved Substances

Aeration is used to remove excessive amounts of iron and manganese from groundwater. These substances cause taste and color problems, interfere with laundering, stain plumbing fixtures, and promote the growth of iron bacteria in water mains. By bubbling air through water, or by creating contact between air and water by spraying, dissolved iron or manganese (Fe2+ , Mn2+) is oxidized to a less soluble form (Fe3+ , Mn4+), which precipitates out and can be removed in s settling tank or filter. Aeration also removes odors caused by hydrogen sulfide (H2S) gas.

Softening of water is a process that removes hardness, caused by the presence of divalent metallic ions, principally Ca2+ and Mg2+. Hardness in water is the result of contact with soil and rock, particularly limestone, in the presence of CO2.

Activated Carbon is an extremely adsorbent material used in water treatment to remove organic contaminants. Activated carbon is produced in a two-stage process. First, a suitable base material such as wood, pest, vegetable matter, or bone is carbonized by heating the material in the absence of air. Then the carbonized material is activated by heating it in the presence of air, CO2 , or steam to burn off any tars it has and to increase its pore size. Adsorption of gases, liquids, and solids by activated carbon is influenced by the temperature and pH of the water as well the complexity of the organics being removed.

In reverse osmosis (RO), fresh water is forced through a semipermeable membrane in the direction opposite to that occurring in natural osmosis. Because the membrane removes dissolved salts, the main application for RO has been in desalination. However, the process also removes organic materials, bacteria, and viruses, and its application in water treatment is growing.

(完整版)环境工程专业英语考试重点词汇

Environmental quality 环境质量Acid rain酸雨 Sulfur dioxide二氧化硫Nitrogen oxide 氧化氮Automobile exhausts汽车尾气Infectious diseases传染病Waterborne diseases通过水传播的疾病 Carbon dioxide二氧化碳Environmental disturbance环境破坏 Aquatic life 水生物 Detection limits 检出限Qualitative 定性的Quantitative定量的Characterization 表征性能描写Unpleasant odors 难闻的气味Trace l level 痕量微量Carbon oxide碳化物 Carbon monoxide 一氧化碳Carbon dioxide 二氧化碳Sulfur oxide 硫化物 Sulfur dioxide二氧化硫 Sulfur trioxide 三氧化硫Nitrogen oxide 氮化物 Nitrous oxide一氧化二氮 Nitric oxide一氧化氮 Nitrogen dioxide 二氧化氮Ethane 乙烷 Propane 丙烷Photochemical oxidants 光氧化剂 Ozone臭氧 Aldehydes 乙醛 Sulfate salts硫酸盐 Hydrogen sulfide 硫化氢Ammonia氨气 Sulfur acids 硫酸 Nitric acid 硝酸 Primary air pollutant一次污染物Second air pollutant二次污染物Biofiltration生物过滤 Volatile organic compounds挥发性化合物Trickling filter滴滤器 Municipal sewage treatment plant市政污水处理厂 Wastewater treatment plant污水 处理厂 Rendering plant 炼油厂 Ethanol 乙醇 Biodegradation 生物降解 Bioremediation 生物治理 Suspended solid(SS)悬浮颗粒 物 Volatile suspended solid(VSS) 挥 发性悬浮颗粒物 Biochemical oxygen demand (BOD)生化需氧量 Heavy mental重金属 Domestic sewage 生活废水 Chemical oxygen demand (COD) 化学需氧量 Sewage 污水、废水 Microorganism微生物 Microbe微生物 Bacteria(复数) Bacterium(单数)细菌 Oxidizer氧化剂 Oxidant氧化剂 Dissolved oxygen溶解氧 Residence time 停留时间 Eutrophic lake富营养化的湖泊 Sanitary sewage 生活污水 Aeration tank 曝气池 Sedimentation tank 沉淀池 Eutrophication 富营养化 Adsorption 吸附 Activated carbon 活性炭 Activated sludge活性污泥 Coagulation 絮凝、凝固 Flocculation 混凝 Sedimentation 沉淀、沉积 Hydrophilic 亲水的、吸水的 Oxidizing agent 氧化剂 Reverse osmosis 反向渗透 Membrane膜 Groundwater地下水 Surface water 地表水 Aluminum sulfate 硫酸铝 Screening (用拦污栅)隔离 Turbidity 浊度,浑浊性 Colloidal胶体 Chlorine dioxide 二氧化氯 Ultraviolet light 紫外线 Limestone 石灰石 Incinerator 焚烧炉 Hazardous waste 危险废物 Refuse垃圾、废物 Environmental protection agency 环保部 Hydrogen sulfide 硫化物 Decontamination 净化,消 除……的污染 Aerobic 需氧的 Anaerobic 厌氧的 Decibel meter 分贝仪 Subsonic 亚声速的 Supersonic 超声速的 Muffler消声器 Ecological disruptions 生态破坏 Aquatic ecosystem 水环境系统 Environmental impact assessments环境影响评价 Kinetics 动力学 Steady-state 稳态的 Point source discharge点源排放 Receiving water收纳水体 Nitrogen oxide 氮氧化物 Photochemical oxidant 光化学氧 化剂 Carbon monoxide一氧化碳 Coliform bacteria 大肠杆菌

环境工程专业英语汇总

专业英语 环境:environment 环境工程:environmental engineering 环境保护:environmental protection 环境意识:environmental consciousness/awareness 环境问题:environmental issue/problem 环境效应:environmental effect 环境污染:environmental pollution 环境要素:environmental elements 环境因子:environmental factors 环境化学:environmental chemistry 环境生态学:environmental ecology 环境质量:environmental quality 环境自净作用:environmental self-purification/self-cleansing 水环境:watershed 水体:water body 流域:watershed 水质:water quality 水资源:water resources 供水:water supply 废水:waste water 水处理:water treatment 物理性水质指标:physical indicate of water quality 水污染物:water pollutant 生物性水质指标:biological water-quality index 水质标准:water quality standard 化学性水质指标:chemical water-quality index DS:dissolved solids BOD:biochemical oxygen demand TDS:total dissolved solids COD:chemical oxygen demand TSS:total suspended solids DO:dissolved oxygen TOC:total organic carbon PH值: TN:总氮total nitrogen TP:总磷phosphorus Zn:zinc Cu:Copper As:arsenic Cd:Cadmium Cr:chromium Ni:Nickel Hg:mercury Pb:plumbum 物理处理:physical treatment 过滤:screening 生物处理:biological treatment 沉淀:sedimentation 化学处理:chemical treatment 气浮:flotation 物理化学处理:physical-chemical treatment 蒸发:evaporation 稀释:dilution 扩散:dispersion 吹脱:stripping 好氧处理:aerobic treatment 生物膜法:bio-membrane process 厌氧处理:anaerobic treatment 生物滤池:trickling filters 活性污泥法:activated sludge process 生物接触氧化:biological contact SBR:苯乙烯-丁二烯Styrene Butadiene Rubber UASB(流式厌氧污泥床):Upflow anaerobic sludge blanket 活性污泥:activated sludge 改进型:modification 一级处理:primary treatment 二级处理:secondary treatment 三级处理:tertiary treatment 高级氧化处理:advanced treatment 生活污水:domestic wastewater 生产废水:industrial wastewater 城市生活污水:municipal wastewater 电镀废水:metalplating plants 印染废水:pulp and paper industries wastewater 浊度:turbidity 硬度:hardness 水质净化:water quality purifies 混凝沉淀:coagulate flocculating agent 活性炭吸附:activated carbon adsorption

环境科学与工程专业英语翻译第三版钟理

环境科学与工程专业英语翻译第三版钟理

第二单元环境工程 这本书主要关于什么? 这本书的目标是使工程和科学的学生了解学科间的研究环境问题:它们的起因,为什么它们被关注,我们怎么控制它们。这本书包括: ●描述环境和环境系统意味着什么 ●关于环境破坏基础原因的信息 ●理解环境问题本质和能够定量计算它们所必要的基本科学知识 ●目前运用在水,空气,污染问题的环境控制技术的状况 ●我们目前在很多关于理解和控制人类活动、自然之间复杂相互作用的科学知识上存在着相当大的空白 ●很多环境问题能运用目前的技术消除或减少,但因为社会缺少意愿这么做或在很多例子中因为缺乏资源去这样做,这些环境问题没有被处理一些重要的定义: 在这本书中,它们第一次被使用,定义被以大写或印刷成黑体字的形式展示 环境是围绕在我们周围的物质生命的栖息地,

在这儿我们能看到,听到,触摸,闻到,和品尝到系统依据韦氏字典,被定义为“一组或一系列能形成一个整体或者有机整体的相互关联的事物”,例如,太阳系统,灌溉系统,供应系统,世界和宇宙。 污染被定义为“在大气,水或土地中的物质的,化学的或生物的特性的不合意的改变,这一改变有害地影响人类或其它生物的健康,生存,或活动”。 当改进环境质量的目标被用来改进人类福利,“环境”一词扩展成包括所有的社会,经济和文化方面的内容。这一扩展在许多真实情况下是不可行的以及在一本被设计为一学期课程的教科书中也是不实际的。我们对环境问题的考察因此限于我们对“环境”的定义。 系统的相互作用 许多不同的环境问题都与水,空气或土地系统有关联。许多这些问题都只适用于这些系统中的一个,这为这些种类中的细目分类提供了充分的理由。这样的分类也更有用于及易于理解一个系统内的相关问题。而且,这样做是明智的,这是因为由于管理上的和行政上的原因,这些有关空

环境保护常用词汇短句中英文对照

环境保护常用词汇短句中英文对照 世界环境日World Environment Day (June 5th) 环境千年——行动起来吧!(2000)The Environment Millennium - Time to Act!拯救地球就是拯救未来!(1999)Our Earth - Our Future - Just Save It! 为了地球上的生命—拯救我们的海洋!(1998)For Life on Earth - Save Our Seas! 为了地球上的生命(1997)For Life on Earth 我们的地球、居住地、家园(1996)Our Earth, Our Habitat, Our Home 国际生物多样性日International Biodiversity Day (29 December) 世界水日World Water Day (22 March) 世界气象日World Meteorological Day(23 March) 世界海洋日World Oceans Day (8 June ) 国家环境保护总局State Environmental Protection Administration (SEPA) 生态示范区eco-demonstration region; environment-friendly region 国家级生态示范区(珠海)Nationally Designated Eco-Demonstration Region 国家级园林城市Nationally Designated Garden City 对水质和空气质量的影响impact on the quality of the water and the air 治理环境污染curb environmental pollution; bring the pollution under control 海藻mostly in polluted waters) 工业固体废物industrial solid wastes 白色污染white pollution (by using and littering of non-degradable white plastics) 可降解一次性塑料袋throwaway bio-degradable plastic bags 放射性废料积存accumulation of radioactive waste 有机污染物organic pollutants 城市垃圾无害化处理率decontamination rate of urban refuse 垃圾填埋场refuse landfill 垃圾焚化厂refuse incinerator 防止过度利用森林protect forests from overexploitation 森林砍伐率rate of deforestation 水土流失water and soil erosion 土壤盐碱化soil alkalization 农药残留pesticide residue 水土保持conservation of water and soil 生态农业environment-friendly agriculture; eco-agriculture 水资源保护区water resource conservation zone 海水淡化sea water desalinization 保护珊瑚礁、红树林和渔业资源protect coral reefs, mangrove and fishing resource 绿化祖国turn the country green 矿物燃料(煤、石油、天然气)fossil fuels: coal, oil, and natural gas 清洁能源clean energy 汽车尾气排放motor vehicle exhaust 尾气净化器exhaust purifier 无铅汽油lead-free gasoline 天然气汽车gas-fueled vehicles 电动汽车cell-driven vehicles; battery cars 氯氟烃CFCs 温室效应greenhouse effect 厄尔尼诺南徊ENSO (El Nino Southern Oscillation)

环境科学与工程专业英语翻译

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晓庄学院期末考试试卷 ( 07 级 环境工程 专业2010 ~2011 学年度 第 一 学期) 课程名称 环境工程专业英语 A 卷 考试形式 闭卷 考核类型 考试 本试卷共 六 大题,卷面满分100分,答题时间120分钟。 一、 请根据缩写写出单词全称:(本题共5小题,每小题2分,共10分) 1. VOC :Volatile Organic Compounds 2. APC :Air Pollution Control 3. SS :Suspended Solids 4. COD :Chemical Oxygen Demand 5. EIA : Environmental Impact Assessment (评分标准:每小题中单词全部写对,不论大小写,得2分;错一个单词得1分;错两个及以上单词,得0分。) 二、 请写出下列术语的英文表达:(本题共5小题,每小题2分,共10分) 1. 城市污水:municipal wastewater 2. 废水处理:wastewater disposal 3. 沉降池:sedimentation tank 4. 消毒:disinfection

5. 絮凝作用:flocculation (评分标准:每小题中所用单词意思基本吻合,单词拼写正确,且单词词态正确,得2分;错一个单词得1分;错两个及以上单词,得0分。) 三、 请根据下列英文解释写出相应的英文词汇:(本题共4小题,每题2分,共10分) 1. The physical and biotic habitat which surrounds us. Environment 2. A natural gas which is formed from decaying matter and burns easily, sometimes causes explosions in mines. Methane 3. Too many people in a given area, too high a population density. Overpopulation 4. The process by which water passes through a membrane that is impermeable to dissolved ions. Osmosis 5. A kind of chemical which can speed up/down a chemical reaction rate. Catalyst (评分标准:每小题中所用单词意思基本吻合,单词拼写正确,且单词词态正确,得2分;否则得0分。) 四、阅读理解:(本题共20分,每小题2分) Passage1 A growing number of these attractions now allow customers to print e-tickets at home with large discounts off the gate price, in part to spur attendance that has declined in recent years. After boom times in the late 1990s, theme park attendance began to decrease, with an overall decline of about 4% over the past few years at North America’s 50 most- visited establishments, says James Zola, editor of Amusement

环境科学与工程专业英语第三版钟理课文翻译1.3【精品文档】

环境工程专业英语钟理翻译 第一部分环境科学和工程的介绍 第三单元什么是废物回收/废物最少化 在美国,讨论术语花了很长时间,这些术语例如源头减量,废物最少化,循环和污染防治。美国环境保护署提供了以下定义。 源头减量:任何能减少废物量存在的行动过程,这些包括,例如,工艺调整,原料改变,提高操作或管理,和过程回收。 废物最少化:尽可能最大程度减少产生的废物,然后处理,储存,或者处置。它包括一些由一个管理者承担的源头减量或回收行为,这些行为会导致总体积、废物数量、废物毒性(或都有)的减少,只要减少废物与以下两点一致:现在减量化的目标和未来对人体健康和环境的威胁。 循环:一个废物的使用和再使用,是一商业产品的替代,或是代替工业生产过程中的原料。这个包括在或不在现场回收废物中的有用部分,或者去除废物中的污染物以达到允许再用的要求。 污染防治:污染可能在工业生产中产生,或当某个产品被商用或消费者使用。这个可能在三个方面防治:改变原料/减少对有毒有害原材料的依赖;改变工艺/更有效率/改善维护(例如改进设备),更好的管理,闭环的过程回收;或调整产品/减少对有毒有害产品的依赖。 随着1984年《关于资源保护和恢复的有害固废的法案》的通过,美国国会建立了一个全国的保护政策,这项政策说明了回收或消除有害废物产生的重要性。

国会拟草宣布了它是美国的一个全国性政策,这一政策无论在那里都可行的,有害废物的产生是要尽可能迅速地被减少或消灭。然而产生的废物还是应该被处理、储存、或处置,进而减少现在和将来对人类健康和环境的威胁。 在1990年,国会通过了《污染防治法案》,建立了一个全国的废物分级管理政策:第一,在任何可行的地方,一次污染是要防治或减少的;第二,废物应该以一种环境安全的方式回收;第三,废物应该被处理;最后一点,废物应该被处置或释放到环境。有了这些法案的通过和其他的环境法律,废物最少化已经在美国成为一个重要的工作理念。 废物回收/废物最少化技术 当对于一些特定的工厂,废物最少化无疑是工厂或现场的特性,这些使用的技术可分为一些大类。 ●产品改变 ●工艺改变 ●设备改造 ●操作训练 ●循环再用 在操作中,废物最少化的机会是有限的,只有被有关植物的人员的智慧利用。这种技术已经被运用最大工业行列和工业化生产过程,和能将运用于有害废物和无害废物。 产品改变 通常地,一种无毒物质能代替一种有毒的。这种例子是众多的。 洛克希德成功地把一种碱性氰化物镉电镀槽转换为酸性非氰化物电镀槽。交换板质量是相等的,总花费可以减少因为简化废物处理的要求,尽管这种交换板在化学上的花费是很高的。

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个人收集整理仅供参考学习 环境工程专业英语术语 A/O 厌氧—好氧法anaerobic / Aerobic (Oxic) A/A/O 厌氧—厌氧—好氧法 AB (Acid-formation bacteria )产酸菌 ABR ( Anaerobic Baffled Reactor )厌氧折流板反应器 Acid step 产酸步骤 Acinetobacter 不动杆菌属 Activated sludge 活性污泥 Activated sludge plant 活性污泥系统 Active bionmass 活性生物量 Adsorption 吸附 Aeration 曝气 Aeration tank 曝气池 Aerobic sludge age 好养泥龄 Aerobic zone 好氧区 AF( Anaerobic Filter )厌氧滤池 AFBR ( Anaerobic Fluidized Bed ) 厌氧流化床反应器 Alkalinity 碱度 Alternating process 交替工艺 Ammonia 氨 Ammonium 铵盐(氨氮) Anaerobic digestion 厌氧消化 Anaerobic filter 厌氧滤池 Anaerobic sludge age 厌氧泥龄 Anoxic zone 缺氧区 ASBR ( Anaerobic Sequencing Batch Reactor ) 厌氧序批式反应器Backwashing 反冲洗 Biofilms生物膜 Biofilters生物滤池 Biofilters for denitrification 反硝化生物滤池 BOD 20 二十日生化需氧量 BOD 5 ( Biochemical Oxygen Demand ) 五日生化需氧量 BODn 总生化需氧量 Bubble formation 气泡形成 Calcium precipitation 钙的沉淀 Carbohydrate 碳水化合物 CASS(Cyclic Activated Sludge System ) 循环式活性污泥法CAST( Cyclic Activated Sludge Technology ) 循环式活性污泥法CFS (Continous Flow System) 连续流系统 CODcr ( Chemical oxygen demand )化学需氧量 Chemical precipitation 化学沉淀 Clogging 堵塞 Combination precipitation 混合沉淀

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术语“活性污泥”是被应用于工序和在处理单元中生物固体两步的。混合液悬浮固体或活性污泥,包含各种各样异养的微生物,例如细菌、原生动物、真菌和更大的微生物。特殊微生物种的主导优势取决于被处理的废物及操作过程中的方法。 活性污泥法是当前最广泛使用的生物处理法。这部分是基于生物质循环这一结果,生物质循环是整个工艺的一部分,它可以使微生物在相对较短的驯化时间内适应废水组分的变化,并能在较大程度上控制驯化菌的数量。 活性污泥系统包括调节池、沉淀池、曝气池,澄清池、和污泥回流过程。污水在调节池均质化,以减少来水的变化,来水的变化也许导致微生物过程的混乱和降低处理的效率。可沉淀的固体在沉淀池中被除去。 接着,污水进入曝气池,使好氧菌维持在悬浮状态,并提供氧气和营养物。水池内的物质被称为混合液。氧气由机械或扩散曝气提供,以增加保持在悬浮状态的微生物数量。混合液从曝气池连续被排入到澄清池,在这里分离被处理的污水中的生物质。生物质的一部分循环到曝气池,以保持曝气池中驯化微生物的最佳浓度。分离剩下的生物质被排放掉,或者说,废弃掉。生物质也许进一步在污泥干燥层脱水,或污泥过滤处置。澄清后的废水被排放掉。 可循环的生物质被称为活性污泥。使用“活性”这个术语,是因为生物质含有活着的驯化微生物,当回流到曝气池的时候,这些微生物以更高的速度代谢转化和吸收有机物。发生的原因是因为来自澄清池的污泥中,食物与微生物的比率较低。 对于工业废水的处理,经常需要补充营养来源,以提供足够的氮和磷。在大多数情况下,氨作为氮源加入,而磷酸作为磷源加入。在曝气池中,必须要保持一个适当的pH范围(6至8)和一个足够的溶解氧浓度(最小值为1至2mg/L),来维持一个健康的活性系统。 曝气池中水力停留时间(HRT)和污泥停留时间(SRT)是重要的操作参数。HRT被定义为曝气池体积与进水流率的比值,而SRT是系统中总污泥量除以污泥

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