Опреснение методом обратного осмоса на полимерных мембранах

Получение пресной воды из океана с помощью химии полимерных мембран

Environmental & Water Treatment Global Industrial Scale $17 billion

Обзор

Reverse osmosis (RO) desalination forces seawater or brackish water through semi-permeable thin-film composite (TFC) polyamide membranes at high pressure to remove dissolved salts. RO now provides drinking water for over 300 million people globally, with the largest plant (Sorek B, Israel) producing 627,000 m3/day. The polyamide membrane chemistry developed in the 1970s-80s enabled the energy-efficient desalination revolution. Modern RO operates at 3-5 kWh/m3, approaching the thermodynamic minimum.

Химический процесс

Seawater (35,000 mg/L TDS) is pretreated by multimedia filtration and ultrafiltration, then pressurized to 55-70 bar using high-pressure pumps. Water molecules permeate through the TFC polyamide membrane while dissolved salts are rejected (>99.5% rejection). Energy recovery devices capture hydraulic energy from the reject brine, recovering 50-60% of input energy. Product water is remineralized and disinfected.

m-Phenylenediamine (MPD) + Trimesoyl chloride (TMC) -> Cross-linked polyamide thin film (interfacial polymerization, membrane formation)
Desalination is physical -- osmotic pressure overcome by applied pressure (DeltaP > Deltapi)

Сырьё

  • Seawater or brackish water — Ocean or groundwater (Feed water)
  • TFC polyamide RO membranes — Interfacial polymerization of MPD and TMC (Semi-permeable barrier)
  • Antiscalant chemicals (phosphonates, polycarboxylates) — Specialty chemical suppliers (Scale prevention on membrane surfaces)

Конечные продукты

  • Desalinated water (permeate) — Drinking water, irrigation, industrial process water (<500 mg/L TDS from seawater feed)
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Environmental Impact

Brine discharge (concentrated reject, 60,000-70,000 mg/L TDS) can harm marine ecosystems at the discharge point. Energy consumption, while greatly improved, still contributes to CO2 emissions unless powered by renewables. Membrane cleaning chemicals are discharged to wastewater. However, RO provides water security in arid regions with no viable alternative.

Соображения безопасности

Последние инновации

Thin-film nanocomposite (TFN) membranes incorporating aquaporin proteins or nanotubes promise higher flux at lower pressure.
Forward osmosis draws water through a membrane using osmotic gradient, potentially reducing energy.
Solar-powered RO enables off-grid desalination for remote communities.

Больше в Environmental & Water Treatment

Адсорбция активированным углём для очистки воды и воздуха

Global Industrial Scale

Биоремедиация нефтезагрязнённых почв

Commercial Production

Десульфуризация дымовых газов (мокрый известняковый скруббер)

Global Industrial Scale

Озонирование воды и расширенное окисление

Commercial Production

Осаждение тяжёлых металлов из промышленных сточных вод

Global Industrial Scale

Умягчение и деионизация воды ионным обменом

Global Industrial Scale

Хлорирование и дезинфекция городской воды

Global Industrial Scale

Frequently Asked Questions

What industry uses Опреснение методом обратного осмоса на полимерных мембранах?
Опреснение методом обратного осмоса на полимерных мембранах is used in the environmental & water treatment sector at global industrial scale scale.
What process is involved in Опреснение методом обратного осмоса на полимерных мембранах?
Seawater (35,000 mg/L TDS) is pretreated by multimedia filtration and ultrafiltration, then pressurized to 55-70 bar using high-pressure pumps. Water molecules permeate through the TFC polyamide membrane while dissolved salts are rejected (>99.5% rejection). Energy recovery devices capture hydraulic
What is the economic significance of Опреснение методом обратного осмоса на полимерных мембранах?
Опреснение методом обратного осмоса на полимерных мембранах has a market value of $17 billion.
What is the environmental impact of Опреснение методом обратного осмоса на полимерных мембранах?
Brine discharge (concentrated reject, 60,000-70,000 mg/L TDS) can harm marine ecosystems at the discharge point. Energy consumption, while greatly improved, still contributes to CO2 emissions unless powered by renewables. Membrane cleaning chemicals are discharged to wastewater. However, RO provides
What raw materials are used in Опреснение методом обратного осмоса на полимерных мембранах?
The main raw materials include: Seawater or brackish water, TFC polyamide RO membranes, Antiscalant chemicals (phosphonates, polycarboxylates).