Urban Waste Management and Environmental Protection | 城市废弃物处理与环境保护

📚 Urban Waste Management and Environmental Protection | 城市废弃物处理与环境保护

Urban waste is one of the most visible and pressing environmental challenges accompanying rapid urbanisation. How a city collects, treats and disposes of its refuse determines not only the cleanliness of its streets but also the quality of its air, water, soil and the health of its residents.

城市废弃物是快速城市化过程中最显而易见且紧迫的环境挑战之一。城市如何收集、处理和处置垃圾，不仅决定街道是否整洁，也决定空气、水、土壤的质量以及居民的健康。

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1. Classification and Sources of Urban Waste | 城市废弃物的分类与来源

Urban waste is generally classified according to its source and composition. The most common category is municipal solid waste (MSW), which includes everyday items discarded by households, shops, offices and public services.

城市废弃物通常按来源和成分分类。最常见的类别是城市固体废弃物，包括家庭、商店、办公室和公共服务部门丢弃的日常物品。

• Household waste: food scraps, packaging, paper, textiles, glass and e-waste.

  家庭废弃物：包括厨余、包装材料、纸张、纺织品、玻璃和电子废弃物。

• Commercial and institutional waste: waste from markets, restaurants, schools and hospitals; medical waste requires special treatment.

  商业与机构废弃物：来自市场、餐馆、学校和医院；其中医疗废弃物需要特殊处理。

• Construction and demolition waste: concrete, bricks, wood and metals generated by building and demolition sites.

  建筑与拆除废弃物：由建筑工地和拆除现场产生的混凝土、砖块、木材和金属。

• Hazardous waste: batteries, paint, solvents and chemicals that are toxic, corrosive or flammable.

  危险废弃物：电池、油漆、溶剂和化学品，具有毒性、腐蚀性或易燃性。

A precise classification is essential because each waste stream requires a different collection system, treatment method and environmental safeguard.

对废弃物进行准确分类至关重要，因为不同类别的废物流需要不同的收集系统、处理方法和环境保护措施。

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2. Drivers of Urban Waste Growth | 城市废弃物增长的驱动因素

The quantity of waste produced in a city depends on three broad factors: population size, per-capita income and the material content of goods. This relationship can be summarised as:

一个城市产生的废弃物总量取决于三个宏观因素：人口规模、人均收入以及商品的材料含量。这一关系可概括为：

Total waste = population × per-capita waste generation

• Population growth directly increases the total amount of residential and commercial waste.

  人口增长直接增加居民和商业废弃物的总量。

• Rising affluence changes consumption patterns, increasing packaging, processed food, single-use products and durable goods.

  富裕程度提高改变了消费模式，增加了包装、加工食品、一次性产品和耐用品的消耗。

• E-commerce and delivery services generate large volumes of cardboard, plastic air-pillows and other packaging waste.

  电子商务和快递服务产生大量纸箱、塑料缓冲袋和其他包装废弃物。

• Planned obsolescence shortens the lifespan of electronic products, producing growing amounts of e-waste.

  计划性淘汰缩短了电子产品的使用寿命，导致电子废弃物不断增多。

• Inadequate waste collection in many low-income cities means waste is dumped illegally, making the visible problem worse than official data suggests.

  垃圾收集不足使许多低收入城市出现非法倾倒，实际可见的废弃物问题比官方数据更为严重。

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3. Environmental Impacts of Unsound Waste Disposal | 不当废弃物处置对环境的影响

When waste is not properly managed, it enters every environmental medium: soil, water and air. The impacts are often cumulative and affect ecosystems far beyond the city boundary.

当废弃物未得到妥善管理时，会进入土壤、水和空气等所有环境介质。这些影响往往具有累积性，其波及范围远超城市边界。

• Leachate pollution: rainwater that filters through decomposing waste dissolves heavy metals and organic toxins, contaminating soil and groundwater.

  渗滤液污染：雨水渗过腐烂的废弃物时，会溶解重金属和有机毒素，污染土壤和地下水。

• Methane emissions: the anaerobic decomposition of organic waste in landfill releases CH₄, a greenhouse gas roughly 28-34 times more powerful than CO₂ over a 100-year period.

  甲烷排放：垃圾填埋场内有机废弃物厌氧分解会释放CH₄，其百年尺度温室效应约为CO₂的28至34倍。

• Air pollution from open burning: informal burning of plastics and cables releases dioxins, furans, fine particulate matter and toxic smoke.

  露天焚烧造成空气污染：非正规焚烧塑料和电缆会释放二噁英、呋喃、细颗粒物和有毒烟气。

• Marine plastic debris: rivers carry litter from cities to oceans, forming accumulation zones and harming marine life through ingestion and entanglement.

  海洋塑料垃圾：河流将城市垃圾带入海洋，形成聚集区，并通过吞食和缠绕危害海洋生物。

These pathways show that waste disposal is not simply a technical issue; it is also an environmental justice issue because poorer communities often live closest to the most polluting facilities.

这些途径表明，废弃物处置不仅是技术问题，也是环境正义问题，因为较贫困的社区往往居住在污染最严重的设施附近。

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4. The Waste Hierarchy | 废弃物管理层级

The waste hierarchy is a widely accepted framework for prioritising management options from most to least environmentally desirable. It underpins many national and local waste strategies.

废弃物管理层级是一个被广泛接受的框架，用于按环境友好程度从高到低排列管理方式。它是许多国家和地方废弃物战略的基础。

Tier	Strategy	Example
1. Reduce 减少	Prevent waste before it is created 在废弃物产生之前加以预防	Lightweight packaging, reusable containers 轻量化包装、可重复使用容器
2. Reuse 再利用	Use a product again without processing 不经处理再次使用产品	Refillable bottles, second-hand markets 可再填充瓶、二手市场
3. Recycle 回收再生	Convert waste into new materials 将废弃物转化为新材料	Paper, glass and metal recovery 纸张、玻璃和金属回收
4. Recover 能源回收	Extract energy from non-recyclable waste 从不可回收废弃物中提取能源	Incineration with electricity or heat generation 焚烧并发电或供热
5. Dispose 末端处置	Final treatment with the least benefit 最终处理，环境效益最低	Landfill without energy capture 无能源回收的填埋

The hierarchy encourages policy-makers to design systems that minimise the amount of material reaching landfill, while acknowledging that some residual waste will always require safe disposal.

该层级鼓励政策制定者设计尽量减少进入填埋场的物料量的系统，同时也承认部分残余废弃物始终需要安全处置。

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5. Landfill: Convenience with Long-Term Costs | 填埋：便捷但需付出长期代价

Landfill remains the most common disposal method in the world because it is relatively cheap, simple and accepts nearly all waste types. However, its environmental and social costs are long-lasting.

填埋仍是全球最常见的处置方式，因为它相对便宜、操作简单且几乎能接受所有废弃物类型。但其环境和社会成本十分持久。

• Land consumption: large sites remain unavailable for other uses for decades, and finding new sites is difficult in densely populated urban regions.

  土地消耗：大型填埋场数十年内无法另作他用，在人口稠密的城市地区寻找新场地十分困难。

• Greenhouse gas production: if landfill gas is not captured, CH₄ seeps into the atmosphere for up to 30 years after closure.

  温室气体产生：如果填埋气体未被收集，CH₄会在封场后长达30年内持续逸散到大气中。

• Groundwater risk: despite liners and capping, leakage of leachate remains a technical challenge, especially in older sites.

  地下水风险：尽管设置了防渗膜和封盖系统，渗滤液泄漏仍是技术难题，尤其是在老旧填埋场中。

• NIMBY conflicts: residents object to landfill siting near homes, schools and water sources, creating planning delays.

  邻避冲突：居民反对将填埋场选址于住宅、学校和取水点附近，导致规划审批拖延。

Modern sanitary landfills can reduce these problems by using composite liners, leachate collection systems, gas capture wells and regular monitoring. Yet they cannot solve the root problem of excessive material consumption.

现代卫生填埋场可通过复合防渗层、渗滤液收集系统、气体收集井和定期监测来减轻这些问题。但仍无法解决过度物质消耗这一根本问题。

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6. Incineration and Energy Recovery | 焚烧与能源回收

Incineration burns waste at high temperatures, greatly reducing its volume and mass while producing heat that can generate electricity or provide district heating.

焚烧是在高温下燃烧废弃物，大幅减小其体积和质量，同时产生可用于发电或区域供热的热能。

Modern incinerators can reduce waste volume by up to 90% and mass by roughly 70-75%. This makes them attractive where land is scarce, such as in Japan, Singapore and parts of Europe.

现代焚烧炉可使废弃物体积减少最高达90%，质量减少约70%至75%。在土地稀缺的地区，如日本、新加坡和欧洲部分地区，焚烧因此具有很大吸引力。

• Air pollution control: scrubbers, filters and catalytic converters remove NOₓ, SO₂, dioxins and heavy metals from flue gas before it is released.

  空气污染控制：洗涤塔、过滤器和催化转化装置在烟气排放前去除NOₓ、SO₂、二噁英和重金属。

• Residue management: bottom ash can be reused as aggregate in construction, while fly ash must be treated as hazardous waste because it contains concentrated heavy metals.

  残渣管理：底灰可作为骨料用于建筑，而飞灰因富集重金属，必须作为危险废弃物处理。

• Energy offset: waste-to-energy plants reduce reliance on fossil fuels, but may discourage recycling if set as the default disposal route.

  能源替代：垃圾焚烧发电厂可减少对化石燃料的依赖，但如果将其设为默认处置方式，可能会抑制回收利用。

From a geographical perspective, incineration alters the urban metabolism by turning waste into an energy input. However, the siting of plants still raises equity and spatial planning issues.

从地理角度看，焚烧通过将废弃物转化为能源输入，改变了城市的新陈代谢。然而，焚烧厂的选址仍会引发公平性和空间规划问题。

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7. Recycling and Composting | 回收利用与堆肥

Recycling converts waste materials into new products, reducing the demand for virgin resources and saving energy. Composting is a biological treatment that transforms organic waste into nutrient-rich soil conditioner.

回收利用将废弃物转化为新产品，减少对原生资源的需求并节约能源。堆肥是一种生物处理方法，将有机废弃物转化为富含养分的土壤改良剂。

• Energy savings: recycling aluminium cans saves about 95% of the energy required to produce new cans from bauxite.

  节能效益：回收铝罐可节约约95%的能耗，而用铝土矿生产新罐的能耗要高得多。

• Resource conservation: recycling paper reduces tree felling, and recycling plastics reduces crude oil extraction.

  资源保护：回收纸张减少树木砍伐，回收塑料减少原油开采。

• Methane avoidance: diverting food waste to composting lowers CH₄ emissions from landfill and returns carbon to the soil.

  减少甲烷：将厨余垃圾转向堆肥可降低填埋场CH₄排放，并把碳归还土壤。

• Challenges: contamination, odour, market volatility and the cost of separate collection can make recycling programmes difficult to sustain.

  挑战：污染混杂、气味、市场波动和分类收集成本，可能使回收项目难以持续。

Recycling rates vary greatly between cities. A high rate usually depends on clear labelling, convenient collection infrastructure, public trust and stable markets for secondary materials.

各城市回收率差异很大。高回收率通常依赖于清晰的标识、便捷的收集设施、公众信任以及再生材料的稳定市场。

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8. Contrasts Between Developed and Developing Cities | 发达与发展中城市的差异

Waste problems are universal, but their character differs markedly between high-income and low-income cities. Understanding these contrasts helps explain why there is no single global solution.

废弃物问题是全球性的，但在高收入和低收入城市之间，其特征存在显著差异。理解这些差异有助于解释为何不存在单一的全球解决方案。

Aspect	High-income city	Low-income city
Waste per person 人均废弃物量	High, typically above 1.5 kg per day 较高，通常超过每天1.5千克	Lower, but growing quickly 较低，但增长迅速
Organic share 有机占比	Relatively small (30-40%) 相对较小，约30%至40%	Often over 50-60% 通常超过50%至60%
Collection coverage 收集覆盖率	Nearly universal 几乎全覆盖	Often below 50% in informal settlements 在非正规住区常低于50%
Main disposal method 主要处置方式	Sanitary landfill, recycling, waste-to-energy 卫生填埋、回收利用、垃圾焚烧发电	Open dumping and uncontrolled burning 露天倾倒和无控焚烧
Informal sector 非正规部门	Marginal or regulated 边缘化或受监管	Important; waste pickers recover materials for income 作用重要；拾荒者通过回收材料获取收入

In many developing cities, the informal waste sector is not simply a problem to be eliminated.

Published by TutorHao | Geography Revision Series | aleveler.com

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