活性污泥法处理污水的核心生化过程是什么，污泥龄如何影响其脱氮？
What is the core biochemical process of the activated sludge process, and how does sludge age affect nitrogen removal?
活性污泥依靠曝气池中混合菌群吸附氧化有机物，并在二沉池分离回流污泥。较长的污泥龄富集硝化菌完成氨氮氧化为硝酸盐；配合缺氧段反硝化可实现生物脱氮，泥龄过短则硝化不稳。
Activated sludge uses aerated mixed cultures to adsorb and oxidize organics, with sludge separated and returned in a secondary clarifier. A longer sludge age enriches nitrifiers to oxidize ammonia to nitrate; with an anoxic zone denitrification achieves biological nitrogen removal, while too short an age destabilizes nitrification.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-11-02
来源 · Source
《排水工程》（中国建筑工业出版社）
Metcalf and Eddy Wastewater Engineering
独立核验依据 · Independent verification: 核验依据 1 ISBN 9787112038954（豆瓣书目条目: 排水工程）
#活性污泥 #污泥龄 #生物脱氮
膜生物反应器（MBR）相比传统活性污泥法有何工程优势与代价？
What engineering advantages and costs does a membrane bioreactor (MBR) have over conventional activated sludge?
MBR 用微滤或超滤膜取代二沉池，出水悬浮物近零、可直接回用，且污泥浓度高、占地小。代价是膜污染需频繁清洗、能耗与换膜成本高，且对运行维护要求更严。
MBR replaces the secondary clarifier with micro- or ultrafiltration membranes, giving near-zero suspended solids effluent for direct reuse, high biomass concentration, and small footprint. The cost is membrane fouling needing frequent cleaning, higher energy and replacement cost, and stricter operation.
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：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 #膜污染
人工湿地的污水处理机理主要涉及哪些过程？
What processes mainly underlie wastewater treatment in constructed wetlands?
人工湿地通过基质过滤截留悬浮物，植物根系供氧营造好氧-厌氧微区，依附于根与填料的生物膜降解有机物并进行硝化和反硝化脱氮。磷则主要靠基质吸附与沉淀去除，有饱和寿命。
Constructed wetlands filter suspended solids by substrate, while plant roots create oxic-anoxic microzones where biofilms degrade organics and perform nitrification-denitrification. Phosphorus is mainly removed by substrate adsorption and precipitation, which has a finite capacity.
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）
Kadlec & Wallace, Treatment Wetlands, 2nd ed., CRC Press
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）
#人工湿地 #生物膜 #脱氮除磷
什么是水体的富营养化，它与污水处理有何关联？
What is eutrophication of water bodies, and how is it linked to wastewater treatment?
富营养化是氮磷等营养盐过量导致藻类等暴发性繁殖、耗氧缺氧的现象。生活污水与农业径流携带的氮磷若未经充分脱除排入水体，会直接加剧富营养化，因此污水厂需强化脱氮除磷。
Eutrophication is the explosive growth of algae from excess nitrogen and phosphorus, causing oxygen depletion. Nitrogen and phosphorus in sewage and runoff, if discharged without adequate removal, directly worsen it, so plants must enhance nutrient removal.
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）
#富营养化 #脱氮除磷 #水体污染
饮用水常规处理工艺通常包括哪几个主要单元？
What are the main units in conventional drinking-water treatment?
常规工艺为混凝、沉淀（或澄清）、过滤与消毒四步。混凝使细小颗粒脱稳絮凝，沉淀与过滤去除悬浮物，最后消毒杀灭病原微生物，保障微生物安全。
Conventional treatment has four steps: coagulation, sedimentation (or clarification), filtration, and disinfection. Coagulation destabilizes fine particles into flocs; sedimentation and filtration remove suspended matter; disinfection kills pathogens for microbial safety.
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）
#给水处理 #混凝 #消毒
为什么饮用水常采用氯消毒，它存在什么主要副产物问题？
Why is chlorine commonly used in drinking water, and what is its main byproduct issue?
氯价廉、持续抑菌（余氯）且操作简便，是最普及的消毒剂。但它与水中天然有机物反应生成三卤甲烷等消毒副产物，长期摄入有健康风险，因此需控制投量与前置去除有机物。
Chlorine is cheap, leaves a residual (free chlorine) that inhibits regrowth, and is easy to apply, making it the most common disinfectant. But it reacts with natural organic matter to form trihalomethanes and other disinfection byproducts, a long-term health concern, so dosage and precursor removal are controlled.
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）
#氯消毒 #消毒副产物 #三卤甲烷
反渗透膜技术淡化海水的基本原理是什么？
What is the basic principle of reverse osmosis for seawater desalination?
反渗透在高于海水渗透压的外压下，迫使水分子透过半透膜而截留盐分与杂质，实现淡水和浓盐水的分离。其能耗主要取决于进水盐度与回收率，是主流的海水淡化方法。
Reverse osmosis applies pressure above seawater's osmotic pressure to drive water through a semipermeable membrane while rejecting salts and impurities, separating permeate from brine. Energy use depends mainly on salinity and recovery, making it the dominant desalination method.
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：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）
Baker, Membrane Technology and Applications, Wiley
#反渗透 #膜分离 #海水淡化