新加坡如何解决海水淡化与水处理How Singapore Solved Desalination and Water Treatment

新加坡方案Singapore's model

出发点：先天缺水，又要摆脱对外依赖Why: scarce water and a strategic dependency

• 国土约 730 平方公里，没有地下含水层，也没有大河。年降雨约 2,400 毫米，但地方太小，存不住水。
• 历史上靠马来西亚柔佛州供水。1961 年协议已于 2011 年到期，现在只剩 1962 年协议，2061 年到期，每天最多可从柔佛河取水 2.5 亿加仑。
• 供水一直是外交筹码，所以新加坡把到 2061 年实现水源自给定为国家安全目标，技术路线都围绕这个目标定。

• About 730 km² of land, with no aquifers and no large rivers. Rainfall is about 2,400 mm a year, but there is too little land to store it.
• Water has historically come from Johor, Malaysia. The 1961 agreement expired in 2011. The 1962 agreement runs to 2061 and allows up to 250 million gallons a day from the Johor River.
• Water supply has long been a diplomatic lever, so self-sufficiency by 2061 is a national security goal, and the technology choices follow from it.

四种水源（Four National Taps）The Four National Taps

主要海水淡化厂Major desalination plants

为什么 NEWater 比海水淡化更重要Why NEWater matters more than desalination

• 能耗：海水反渗透约 3.5 kWh/m³，NEWater 约 1 kWh/m³。原水含盐量低，所以便宜得多。
• 用途分层：NEWater 主要供应晶圆厂、电子厂和空调冷却等对水质要求极高的工业用户。只有很少一部分在旱季注入水库，与原水混合后再处理成饮用水（间接饮用回用）。这样就把高品质需求和饮用需求分开了。
• 公众接受度：起初叫"污水回用"，后来改名 NEWater，配套建了参观中心，并请国际专家组做独立水质评估，最后被市民接受。

• Energy: seawater RO uses about 3.5 kWh/m³; NEWater uses about 1 kWh/m³. Its feed water is far less salty, so it costs much less to treat.
• Matching use to quality: NEWater mainly supplies wafer fabs, electronics plants and cooling systems that need very pure water. A small share goes into reservoirs in dry periods, where it mixes with raw water and is treated again for drinking (indirect potable reuse). High-purity industrial demand is kept separate from drinking water demand.
• Public acceptance: the product was rebranded from "wastewater reuse" to NEWater, a visitor centre was built, and an international expert panel audited water quality independently. The public accepted it.

污水处理：深层隧道排污系统（DTSS）Used water: the Deep Tunnel Sewerage System (DTSS)

• 全岛 100% 接入污水管网，雨水和污水完全分开排放。雨水进水库，污水进再生水厂。
• 两条深埋 20–55 米的隧道靠重力把全岛污水输送到东、西两个超大型再生水厂，取代了大量分散的污水厂和泵站，腾出土地。
• 一期为樟宜再生水厂（2008 年），厂内直接配套 NEWater 厂。二期为大士再生水厂，与焚烧厂同址建设，称"大士综合体（Tuas Nexus）"。利用污泥与焚烧的协同效应，目标是能源自给，目前分阶段投产。
• 设计思路是让污水变成原水：每一滴水都被收集、处理、再利用，形成闭环。

• 100% sewer coverage, with stormwater and used water kept fully separate. Stormwater goes to reservoirs and used water goes to water reclamation plants.
• Two tunnels, 20–55 m deep, carry used water by gravity to two very large reclamation plants in the east and west. They replaced many scattered treatment plants and pumping stations and freed up land.
• Phase 1 is Changi Water Reclamation Plant (2008), with a NEWater plant on site. Phase 2 is Tuas Water Reclamation Plant, built together with an incinerator as Tuas Nexus. Sludge and waste treatment work together, with the goal of energy self-sufficiency. Phase 2 is coming online in stages.
• The idea is to treat used water as raw water: every drop is collected, treated and reused in a closed loop.

制度安排How it is governed

• 一个机构管全部水循环：2001 年起，公用事业局（PUB）统管集水、供水、排水、污水和再生水；2020 年又增加了海岸防护职能。没有部门之间的推诿。
• 水价按边际成本定：边际水源是海水淡化，水价就按海水淡化成本定，不做补贴，另加节水税和水处理费。2017 年上调 30%，2024 年和 2025 年分两次再涨 0.5 新元/m³。低收入家庭用 U-Save 现金返还补助，不靠压低水价来照顾。
• 需求管理：人均日家庭用水从 2003 年的 165 升降到约 141 升，目标 2030 年降到 130 升。手段包括强制用水效率标签、强制安装节水器具，以及大用户必须提交节水计划。
• 公私合作有得有失：早期海水淡化厂和 NEWater 厂大量采用 DBOO 模式，带出了 Hyflux、胜科、吉宝等企业。2020 年 Hyflux 破产后，PUB 对新增关键产能明显收紧，更多自持或要求更强的履约保障。
• 研发和产业：持续投入水务研发，聚集约 180–200 家水务企业和研究机构。研发重点是降低海水淡化能耗，包括电去离子、仿生膜和压力回收，阶段目标是 2 kWh/m³ 以下。

• One agency for the whole loop: since 2001, PUB has run catchment, supply, drainage, used water and reclamation. Coastal protection was added in 2020. No gaps between agencies.
• Prices at marginal cost: desalination is the marginal source, so tariffs reflect its cost with no subsidy, plus a water conservation tax and a waterborne fee. Prices rose 30% in 2017 and by a further S$0.50/m³ over two steps in 2024 and 2025. Low-income households get U-Save rebates instead of cheaper water.
• Demand management: household use per person fell from 165 litres a day in 2003 to about 141, with a target of 130 by 2030. Tools include mandatory water efficiency labels, mandatory water-saving fittings and water efficiency plans for large users.
• Mixed results from public-private partnerships: early desalination and NEWater plants were mostly DBOO projects, which grew firms such as Hyflux, Sembcorp and Keppel. After Hyflux collapsed in 2020, PUB tightened its approach to new critical capacity, owning more itself or demanding stronger performance guarantees.
• R&D and industry: sustained water R&D funding has drawn about 180–200 water companies and research centres. The main goal is cutting desalination energy use through electro-deionisation, biomimetic membranes and pressure recovery, with a near-term target below 2 kWh/m³.

主要挑战Challenges ahead

• 能源和碳排放：海水淡化和 NEWater 规模越大越耗电，而电力几乎全靠进口天然气，与碳中和目标存在冲突。
• 气候变化：海平面上升威胁地势低的集水区和滨海堤坝。
• 需求翻倍：总用水量约每天 4.3 亿加仑，预计到 2065 年翻一倍，主要来自半导体和数据中心等工业。
• 2061 年之后：柔佛协议到期后，缺口全靠 NEWater 和海水淡化填补。

• Energy and carbon: more desalination and NEWater means more electricity, which comes almost entirely from imported natural gas. This conflicts with net-zero goals.
• Climate change: rising sea levels threaten low-lying catchments and Marina Barrage.
• Demand doubling: total use is about 430 million gallons a day and is expected to double by 2065, driven by industry such as semiconductors and data centres.
• After 2061: once the Johor agreement ends, NEWater and desalination must cover the gap.

全球企业排名Global company ranking

排名看五项：大型反渗透海水淡化工程业绩；再生水回用能力；投资持有和长期运营能力；膜、能量回收装置等核心技术；财务稳健性。下表列出能交付"新加坡式完整解决方案"的企业。

The ranking weighs five factors: large seawater RO project record; water reuse capability; ability to invest in and operate plants long term; core technology such as membranes and energy recovery devices; and financial strength. The table lists companies that can deliver a complete Singapore-style solution.

其他值得关注：Sacyr Water（2024–2025 年中标产能全球第 9）、Metito（阿联酋）、VA Tech Wabag（印度）、Suez（2022 年拆分后的新 Suez）、Cox（原 Abengoa 水务）。

Also worth watching: Sacyr Water (9th by 2024–2025 awarded capacity), Metito (UAE), VA Tech Wabag (India), Suez (the post-2022 company) and Cox (formerly Abengoa's water business).

核心部件与技术Key components and technology

这一层决定海水淡化的能耗和成本，也就是新加坡最关心的问题。

This layer sets the energy use and cost of desalination, which is Singapore's main concern.

反渗透膜Reverse osmosis membranes

借鉴与选型Takeaways and partner selection

按需求选企业Matching the need to the company

对其他地区的借鉴Lessons for other regions

• 中东海湾国家：海水淡化是当地主力水源，规模远大于新加坡，但再生水回用率普遍偏低。最值得学的不是海水淡化，而是把污水当原水用，以及一个机构统管、按成本定价。
• 中国沿海城市和工业园区：最直接可用的是"高品质再生水供给半导体和电子工业"的模式，以及"雨污分流 + 集中式再生水厂 + 与固废处理同址协同"的大士综合体模式。
• 项目层面：水厂的公私合作项目要防范 Hyflux 式风险，合同里需要设计政府回收资产的条款。

• Gulf states: desalination is the main source and far larger than in Singapore, but water reuse rates are generally low. The lesson is less about desalination and more about treating used water as a source, plus single-agency management and cost-based pricing.
• Chinese coastal cities and industrial parks: the most transferable ideas are supplying high-purity recycled water to semiconductor and electronics plants, and the Tuas Nexus model of separate sewers, centralised reclamation plants and co-location with waste treatment.
• At project level: water PPPs must guard against Hyflux-type risk, with contract terms that let the government take back the asset.

中东如何解决用水问题，尤其是沙漠地区How the Middle East solves water, especially in the desert

中东的路线和新加坡几乎相反。新加坡缺地不缺雨，靠闭环回用；中东缺雨不缺能源，靠用能源换水，也就是大规模海水淡化加长距离输水。剩下的缺口靠抽取不可再生的化石地下水，以及从国外进口粮食来填补。这条路线解决了城市用水，但带来能耗高、地下水快被抽干、浓盐水排回海湾三个问题。所以近十年中东在往低碳淡化、污水回用、节水农业和战略储水方向转型。

The Middle East took almost the opposite route to Singapore. Singapore is short of land but not rain, so it closes the loop. The Middle East is short of rain but not energy, so it turns energy into water through large-scale desalination and long pipelines. It fills the rest of the gap by pumping non-renewable fossil groundwater and by importing food. This solved urban supply but created three problems: high energy use, depleted aquifers and brine discharged into the Gulf. Over the past decade the region has shifted toward low-carbon desalination, water reuse, water-efficient farming and strategic storage.

水从哪里来Where the water comes from

海水淡化怎么做到规模化How desalination reached scale

• 从联产转向反渗透：过去淡化厂和燃气电厂绑在一起，用余热蒸馏海水，水和电互相牵制。现在单独建反渗透厂，能耗从热法的十几 kWh/m³ 降到约 3 kWh/m³。
• 独立水务项目（IWP）模式：政府或国有购水方签 20–30 年购水协议，私营开发商负责融资、建设和运营。沙特由水务合伙公司 SWPC 招标，阿联酋由各酋长国电力水务局招标。
• 光伏降本：海湾光伏电价已降到全球最低一档，"光伏 + 反渗透"让淡化水的边际成本明显下降。沙特 NEOM 新城计划完全用可再生能源淡化海水。
• 长距离输水：沙特把东海岸朱拜勒的淡化水通过 400 多公里管线送到利雅得，红海沿岸的淡化水送往麦加、麦地那。沙漠城市其实是靠管线接到海边的。

• From co-generation to RO: desalination plants used to be tied to gas power stations and used their waste heat, so water and power output constrained each other. Stand-alone RO plants cut energy use from over 10 kWh/m³ for thermal to about 3 kWh/m³.
• Independent water projects (IWP): a government or state offtaker signs a 20–30 year water purchase agreement and a private developer finances, builds and runs the plant. SWPC tenders in Saudi Arabia; each emirate's utility tenders in the UAE.
• Cheaper with solar: Gulf solar power is among the cheapest in the world, and solar plus RO has cut the marginal cost of desalinated water. Saudi Arabia's NEOM plans fully renewable desalination.
• Long pipelines: water from Jubail on the east coast travels over 400 km to Riyadh, and Red Sea water goes to Mecca and Medina. Desert cities are effectively piped to the sea.

沙漠内陆的特殊做法What works deep in the desert

需求侧：中东最大的短板Demand: the region's weakest point

• 人均用水量极高：阿联酋、沙特人均日生活用水长期在 250–500 升，是新加坡（约 141 升）的两到三倍。
• 水价补贴深：长期低于成本供水。2016 年起沙特大幅调价，阿联酋对本国和外籍居民分层定价，但整体仍远低于新加坡的水平。
• 管网漏损：部分国家漏损率在 20–30%。

• Very high use per person: household use in the UAE and Saudi Arabia has long been 250–500 litres a day, two to three times Singapore's 141.
• Deep subsidies: water has long been sold below cost. Saudi Arabia raised tariffs sharply from 2016 and the UAE charges nationals and expatriates different rates, but prices remain far below Singapore's.
• Network losses: 20–30% in some countries.

主要风险Main risks

• 浓盐水排放：海湾是半封闭海域，大量浓盐水排回后局部盐度和水温上升，影响生态，也让取水更难处理。
• 淡化厂集中在海湾沿岸：漏油或军事冲突会直接威胁取水口，新产能正分散到红海（沙特）和阿曼湾（阿联酋富查伊拉）沿岸。
• 供应链：反渗透膜、高压泵、能量回收装置和药剂高度依赖进口，海湾航运受阻会影响备件和药剂补给。
• 地下水枯竭：化石地下水抽完就没有了，内陆农业不可持续。
• 能源和碳排放：淡化耗能与碳中和目标冲突，必须转向光伏供电。

• Brine: the Gulf is semi-enclosed, so brine discharge raises local salinity and temperature, harming ecosystems and making intake water harder to treat.
• Plants concentrated on the Gulf coast: oil spills or conflict threaten intakes directly, so new capacity is moving to the Red Sea (Saudi Arabia) and the Gulf of Oman (Fujairah, UAE).
• Supply chain: membranes, pumps, energy recovery devices and chemicals are largely imported, so disruption to Gulf shipping hits spares and chemical supply.
• Depleting aquifers: once fossil groundwater is gone it does not come back; inland farming is unsustainable.
• Energy and carbon: desalination's energy use conflicts with net-zero goals, so a shift to solar is required.

与新加坡对照Compared with Singapore

中东可以向新加坡借鉴：提高污水回用率，按成本定价，由一个机构统管水循环。新加坡可以向中东借鉴：大规模独立水务项目的招标和融资模式，以及光伏加淡化的降本路径。

The Middle East can learn from Singapore: more water reuse, cost-based pricing and one agency for the whole loop. Singapore can learn from the Middle East: tendering and financing large independent water projects, and cutting costs with solar-powered desalination.

市场机会Market opportunities