SCR脱硝的原理是什么？为什么催化剂活性温度窗口很关键？
What is the principle of selective catalytic reduction (SCR) for denitration, and why is the catalyst temperature window critical?
SCR向烟气中喷入氨（或尿素水解的氨），在催化剂表面把氮氧化物选择性还原成氮气和水，反应温度通常在300至420摄氏度，常用钒钛类催化剂。温度低于窗口时反应速率骤降且氨盐析出堵塞催化剂，温度过高则催化剂烧结失活并可能产生更多一氧化二氮。因此锅炉负荷变化导致烟温波动时，常需调节喷氨量或采用省煤器旁路，避免催化剂失效并控制氨逃逸。
SCR injects ammonia (or ammonia from urea hydrolysis) into the flue gas and, on the catalyst surface, selectively reduces nitrogen oxides to nitrogen and water, typically at 300 to 420 degrees Celsius over vanadia-titania catalysts. Below the window the reaction slows sharply and ammonium salts deposit on and plug the catalyst; above it the catalyst sinters and deactivates and more nitrous oxide may form. Because boiler load swings move the flue-gas temperature, operators adjust ammonia injection or use economiser bypasses to protect the catalyst and control ammonia slip.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：本题原挂出处与答案内容不符，已撤回；具体书目待补，暂不展示来源。
本题原挂出处与答案内容不符，已撤回；具体书目待补。
Previous citation withdrawn as unsupported for this answer; a specific source is pending.
#SCR #脱硝 #催化剂
什么是“碳中和”？实现路径依赖哪些关键技术？
What is carbon neutrality, and what key technologies does the pathway rely on?
碳中和指一定时期内人为二氧化碳排放与清除量相抵、净排放为零。实现路径依赖可再生能源、终端电气化、碳捕集利用与封存（CCUS）、植树造林与绿氢等技术。
Carbon neutrality means that over a period, human CO2 emissions are balanced by removals, giving net-zero emissions. The pathway relies on renewable energy, electrification, carbon capture utilization and storage (CCUS), reforestation, and green hydrogen.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Davis & Cornwell，《环境工程导论》（McGraw-Hill）
Davis & Cornwell, 'Introduction to Environmental Engineering' (McGraw-Hill)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL2680544W：Introduction to environ
#碳中和 #碳捕集 #CCUS #绿氢 #可再生能源
什么是“生命周期评价”（LCA）？ISO 14040 如何规定其框架？
What is life cycle assessment (LCA), and how does ISO 14040 define its framework?
LCA 量化产品从原料获取、制造、使用到废弃全过程的环境影响。ISO 14040/14044 规定四个阶段：目标与范围定义、清单分析（LCI）、影响评价（LCIA）与结果解释。
LCA quantifies a product's environmental impacts across its whole life, from raw materials through manufacturing, use, and disposal. ISO 14040/14044 define four phases: goal and scope definition, inventory analysis (LCI), impact assessment (LCIA), and interpretation.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
国际标准化组织（ISO）ISO 14040:2006 与 ISO 14044:2006
International Organization for Standardization (ISO) ISO 14040:2006 and ISO 14044:2006
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787502623746（豆瓣书目条目: 国际标准化组织ISO）
#生命周期评价 #LCA #ISO 14040 #环境影响
『循环经济』和传统的『线性经济』有何不同？
How does a 'circular economy' differ from the traditional linear one?
线性经济是『开采—制造—丢弃』，循环经济强调减量化、再利用、再循环，让材料和产品在设计上可循环，延长使用寿命、减少废物和原生资源消耗。
Linear economy is take–make–dump; circular economy stresses reduce, reuse, recycle so materials loop back by design, extending life and cutting waste and virgin resource use.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Davis & Cornwell，《环境工程导论》（McGraw-Hill）
Davis & Cornwell, 'Introduction to Environmental Engineering' (McGraw-Hill)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL2680544W：Introduction to environ
#循环经济 #回收 #减量化
人工湿地为什么能净化污水？
Why can constructed wetlands purify wastewater?
人工湿地模拟自然湿地，污水流经基质、植物和附着微生物，靠物理拦截、植物吸收与微生物降解共同去除氮磷和有机物，运行能耗低、景观好。
Constructed wetlands mimic nature: water passes through substrate, plants, and biofilms where physical trapping, plant uptake, and microbial breakdown remove nitrogen, phosphorus, and organics at low energy.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
NFPA 消防与给水排水规范（NFPA 13/14/25/101）；Metcalf & Eddy《废水工程：处理与回用》
NFPA fire/plumbing codes (NFPA 13/14/25/101); Metcalf & Eddy, Wastewater Engineering: Treatment and Reuse
独立核验依据 · Independent verification: 核验依据 1 ARCHIVE 标识 MetcalfEddyWastewaterEngineeringTreatmentAndR
#人工湿地 #净化 #氮磷
厌氧消化处理污泥或厨余时发生了什么？
What happens in anaerobic digestion of sludge or food waste?
厌氧消化在无氧条件下靠厌氧微生物把有机物分解成甲烷和二氧化碳为主的沼气，同时减量污泥。沼气可作能源，是废物资源化的常用技术。
Anaerobic digestion lets microbes break organics into biogas—mainly methane and CO2—without oxygen, while reducing sludge. The biogas is usable energy, a common waste-to-resource route.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《水污染控制工程》（高等教育出版社）
Metcalf and Eddy Wastewater Engineering
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040209037（豆瓣书目条目: 水污染控制工程）
#厌氧 #沼气 #消化
垃圾焚烧发电是如何实现减量化和资源化的？二噁英如何控制？
How does waste-to-energy incineration achieve volume reduction and resource recovery, and how are dioxins controlled?
焚烧使垃圾体积减少约85%至90%、质量减少约70%，燃烧释放的热量通过余热锅炉产生蒸汽推动汽轮发电机发电，炉渣经处理后还可作为建材，实现了减量与资源化。二噁英的控制核心是三T加E原则（温度、停留时间、湍流和过量空气）：保持炉温850摄氏度以上、烟气在高温区停留2秒以上、加强湍流混合并保证足够过量空气，再配合活性炭吸附和布袋除尘，把二噁英排放降到极低水平。
Incineration shrinks waste volume by roughly 85 to 90 percent and mass by about 70 percent; the combustion heat raises steam in a waste-heat boiler to drive a turbine generator, and treated bottom ash is reused in construction, achieving both reduction and resource recovery. Dioxin control follows the 3T plus E rule (temperature, time, turbulence and excess air): furnace temperatures above 850 degrees Celsius, gas residence above 2 seconds at high temperature, strong turbulent mixing and sufficient excess air, together with activated-carbon injection and bag filters that cut dioxin emissions to extremely low levels.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Davis & Cornwell，《环境工程导论》（McGraw-Hill）
Davis & Cornwell, 'Introduction to Environmental Engineering' (McGraw-Hill)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL2680544W：Introduction to environ
#垃圾焚烧 #余热发电 #二噁英
生物膜法处理污水和活性污泥法有何不同？
How does biofilm treatment differ from activated sludge?
生物膜法是让微生物附着在填料或转盘表面形成膜，污水流过时膜上菌群降解污染物，无需大量回流悬浮污泥，抗冲击负荷较强、剩余污泥较少。
Biofilm processes grow microbes on fixed media; water flowing past is cleaned by the attached film, needing no return of suspended sludge—more shock-resistant with less excess sludge.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《水污染控制工程》（高等教育出版社）
Metcalf and Eddy Wastewater Engineering
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787040209037（豆瓣书目条目: 水污染控制工程）
#生物膜 #填料 #降解
石灰石石膏湿法脱硫的基本原理是什么？为什么脱硫效率能高达95%以上？
What is the basic principle of limestone-gypsum wet flue-gas desulfurization, and why can removal efficiency exceed 95 percent?
脱硫塔内用石灰石浆液从上喷淋，烟气从下上升，二氧化硫溶于水生成亚硫酸，与浆液中的碳酸钙反应生成亚硫酸钙，再经氧化空气强制氧化成硫酸钙（石膏）析出。气液两相逆流接触、浆液循环量大、塔内停留时间长，且石灰石价格便宜来源广，因此该工艺成为燃煤电厂主流，配合高效喷嘴和除雾器可稳定达到95%以上的脱硫率。
In the absorber tower limestone slurry is sprayed downward while flue gas rises; SO2 dissolves in water to form sulphurous acid, which reacts with calcium carbonate to give calcium sulphite, and forced-oxidation air converts it to calcium sulphate (gypsum) that crystallises out. Countercurrent gas-liquid contact, high slurry circulation and long residence time make this the mainstream choice for coal-fired plants, and with efficient nozzles and mist eliminators removal efficiency is stably above 95 percent, aided by the cheap, abundant limestone reagent.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
Crittenden 等，《水处理：原理与设计》（第3版）
Crittenden et al., 'Water Treatment: Principles and Design' (3rd ed.)
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787562845584（豆瓣书目条目: 水处理原理与设计）
#脱硫 #烟气处理 #石灰石石膏法
膜生物反应器（MBR）与传统活性污泥法相比有什么优势？膜污染如何缓解？
What advantages does a membrane bioreactor (MBR) have over conventional activated sludge, and how is membrane fouling mitigated?
MBR把膜分离组件直接浸在或置于生物反应器中，用膜代替二沉池实现泥水分离，出水中悬浮物和细菌几乎为零，容积负荷高、占地小，污泥浓度可提高数倍。膜污染是主要运行难题，污染物在膜表面堆积使通量下降，缓解手段包括曝气冲刷膜面、定期反洗、化学清洗以及控制污泥浓度和运行通量。
An MBR places a membrane module directly in the bioreactor and replaces the secondary clarifier with membrane separation, giving effluent almost free of suspended solids and bacteria, high volumetric load, small footprint, and several-fold higher mixed-liquor concentration. Membrane fouling is the main operational challenge: deposited foulants cut the permeate flux. Countermeasures include air scouring of the membrane surface, periodic backwashing, chemical cleaning, and controlling sludge concentration and operating flux.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录含书名，但缺版次 / 出版社 / 年份中的一部分，需编辑补全后才能做独立比对。
《膜分离技术》（化学工业出版社）
Judd, The MBR Book, 2nd ed., Elsevier
#MBR #膜生物反应器 #污水处理
海绵城市的核心理念是什么？透水铺装、绿色屋顶等设施如何发挥作用？
What is the core concept of sponge city, and how do permeable pavements and green roofs work?
海绵城市强调把雨水就地渗、滞、蓄、净、用、排，通过源头分散控制减少城市内涝并补充地下水。透水铺装让雨水直接下渗回补土壤，绿色屋顶截留并蒸发部分雨水、减缓屋面径流，下沉式绿地、雨水花园和蓄水池则临时储存径流并自然净化，最后超出能力的雨水再进入管网。这一体系把灰色管网与绿色基础设施结合，削减洪峰、净化水质。
A sponge city manages stormwater locally through infiltration, retention, storage, purification, reuse and controlled discharge, cutting urban flooding at the source and recharging groundwater. Permeable pavement lets rain soak back into the soil, green roofs retain and evaporate rainfall while delaying roof runoff, and sunken green spaces, rain gardens and storage tanks temporarily hold and naturally treat runoff, with excess draining into pipes. This system couples grey pipe networks with green infrastructure to shave flood peaks and improve water quality.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
NFPA 消防与给水排水规范（NFPA 13/14/25/101）；Metcalf & Eddy《废水工程：处理与回用》
NFPA fire/plumbing codes (NFPA 13/14/25/101); Metcalf & Eddy, Wastewater Engineering: Treatment and Reuse
独立核验依据 · Independent verification: 核验依据 1 ARCHIVE 标识 MetcalfEddyWastewaterEngineeringTreatmentAndR
#海绵城市 #雨水管理 #绿色基础设施
雨水花园是怎样帮助城市排水的？
How do rain gardens help urban drainage?
雨水花园是下凹并种有耐涝植物的浅坑，承接屋顶和路面的雨水，通过土壤渗透和植物蒸腾滞蓄径流、过滤污染物，减轻市政管网和河道压力。
A rain garden is a shallow planted depression that catches roof and street runoff, letting soil infiltrate and plants transpire it while filtering pollutants, easing storm sewers and streams.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
ASHRAE Standard 90.1；被动房研究所（Passivhaus Institut）；EPA 绿色建筑与雨洪管理
ASHRAE Standard 90.1; Passive House Institute (Passivhaus Institut); EPA green building and stormwater guidance
#雨水花园 #径流 #渗透
活性污泥法处理污水的原理是什么？曝气池为什么必须供氧？
What is the principle of the activated sludge process, and why must the aeration tank be supplied with oxygen?
活性污泥由大量好氧微生物（细菌、原生动物等）组成，微生物在有氧条件下把污水中的有机污染物氧化分解为二氧化碳、水和新的微生物细胞，同时部分污染物被吸附去除。曝气既为微生物提供溶解氧维持好氧代谢，又搅拌混合使污泥与污水充分接触并防止沉淀。处理后混合液进入二沉池，污泥沉降分离，上清液排出，部分污泥回流保持系统浓度。
Activated sludge is a culture of aerobic microorganisms (bacteria, protozoa and more) that, in the presence of oxygen, oxidise the organic pollutants in wastewater into carbon dioxide, water and new biomass while also adsorbing a portion of the pollutants. Aeration supplies dissolved oxygen for aerobic metabolism and mixes the sludge with the wastewater, preventing settlement. The mixed liquor then flows to a secondary clarifier where sludge settles out, the supernatant is discharged, and part of the sludge is returned to keep the system concentration stable.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
美国水环境联合会（WEF）
WEF (Water Environment Federation)
#活性污泥 #污水处理 #曝气
活性污泥法如何处理城市污水？其核心微生物过程是什么？
How does the activated sludge process treat municipal wastewater, and what is its core microbial process?
活性污泥法在曝气池中让混合的微生物絮体吸附并氧化分解有机物（降低 BOD），随后在二沉池中泥水分离，部分污泥作为回流污泥（RAS）返回。核心是有氧生物降解与硝化过程。
The activated sludge process aerates a tank where mixed microbial flocs adsorb and oxidize organic matter (reducing BOD), then a clarifier separates biomass, part of which is returned as return activated sludge (RAS). The core is aerobic biodegradation and nitrification.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
水环境联合会（WEF）；Metcalf & Eddy《废水工程：处理与资源回收》
Water Environment Federation (WEF); Metcalf & Eddy, 'Wastewater Engineering: Treatment and Resource Recovery'
#活性污泥法 #污水处理 #BOD #硝化 #回流污泥
自来水厂净水时为什么要加絮凝剂？
Why do water plants add coagulants/flocculants?
水中细小悬浮颗粒难以自然沉淀，加入铝盐或铁盐等絮凝剂后，颗粒脱稳聚集形成较大絮体，更容易沉降或被滤掉，从而去除浊度和部分污染物。
Tiny suspended particles won't settle easily; adding aluminum or iron salts destabilizes and clumps them into larger flocs that settle or filter out, removing turbidity and some pollutants.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《给水工程》（中国建筑工业出版社）
Water Treatment Principles and Design, AWWA/MWH
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787112038787（豆瓣书目条目: 给水工程）
#絮凝 #混凝 #沉淀
常规饮用水处理工艺包括哪几个步骤？每一步分别去除什么？
What are the steps of a conventional drinking-water treatment train, and what does each remove?
常规工艺为混凝、沉淀、过滤、消毒。混凝投加铝盐或铁盐使细小颗粒脱稳聚集成大絮体，沉淀池让絮体沉降分离，快滤池用石英砂等滤料截留剩余悬浮物和部分微生物，最后加氯或臭氧等消毒剂灭活病原体。必要时还辅以活性炭吸附去除有机物、臭氧氧化等深度处理。
The conventional train is coagulation, sedimentation, filtration and disinfection. Coagulation adds aluminium or iron salts to destabilise fine particles so they aggregate into flocs; the sedimentation basin settles the flocs out; rapid sand filters trap residual suspended solids and many microbes; and finally a disinfectant such as chlorine or ozone inactivates pathogens. Advanced steps such as activated-carbon adsorption for organics or ozonation are added as needed.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《给水工程》（中国建筑工业出版社）
Water Treatment Principles and Design, AWWA/MWH
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787112038787（豆瓣书目条目: 给水工程）
#饮用水 #水处理工艺 #消毒
什么是『碳足迹』？
What is a 'carbon footprint'?
碳足迹是一个人、产品或活动在整个生命周期中直接和间接排放的温室气体总量，通常用二氧化碳当量表示。它能帮助比较不同选择对气候的影响。
A carbon footprint is the total greenhouse gases emitted directly and indirectly by a person, product, or activity, usually in CO2 equivalents, helping compare climate impacts of choices.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Davis & Cornwell，《环境工程导论》（McGraw-Hill）
Davis & Cornwell, 'Introduction to Environmental Engineering' (McGraw-Hill)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL2680544W：Introduction to environ
#碳足迹 #温室气体 #二氧化碳
PM2.5指的是什么，为什么要注意它？
What does PM2.5 refer to, and why care about it?
PM2.5是空气中直径不超过2.5微米的细颗粒物，能深入肺部甚至进入血液，关联哮喘、心肺疾病。它来自燃烧、扬尘和二次反应生成，是空气质量核心指标。
PM2.5 are fine particles up to 2.5 micrometers that penetrate deep into lungs and blood, linked to asthma and heart/lung disease. From combustion, dust, and reactions, it is a key air-quality metric.
难度 入门 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Davis & Cornwell，《环境工程导论》（McGraw-Hill）
Davis & Cornwell, 'Introduction to Environmental Engineering' (McGraw-Hill)
独立核验依据 · Independent verification: 核验依据 1 OPENLIBRARY 标识 /works/OL2680544W：Introduction to environ
#PM2.5 #颗粒物 #空气质量