Documented case studies from twenty-eight major desalination and power station seawater intakes across MENA, Asia-Pacific, Europe, the Americas and Atlantic Africa — the organisms present, the engineering controls deployed, and the outcomes recorded in operational and research literature.
Seawater intake fouling is not a niche problem — it affects power stations, desalination plants and offshore facilities on every coastline. Yet the published engineering literature is fragmented: individual plant studies sit in utility reports, academic journals and conference proceedings that rarely cross-reference each other. This reference page consolidates case data from twenty-eight sites across seventeen countries, covering five continents and a capacity range from small offshore platforms to the world’s largest hybrid desalination facility. The aim is to give intake engineers a single starting point for understanding which organisms dominate in a given climate, what dosing and screening strategies have been applied, and — critically — what the outcomes were. The dataset spans nuclear power and thermal power stations, large-scale seawater reverse osmosis plants, an offshore oil platform and a pilot desalination project, giving a cross-section that no single climate or project type can provide alone.
Reference sites
Countries covered
Continents
Largest plant capacity
Twenty-eight sites. Dominant fouling organisms, primary control strategy and recorded outcome.
| Site / Plant | Country | Type | Capacity | Dominant Foulers | Primary Control | Outcome / Notes |
|---|---|---|---|---|---|---|
| Ras Al-Khair | Saudi Arabia | Hybrid MSF + RO | 1,036,000 m³/day | Algal organic matter (AOM); warm high-salinity seawater (41.2 PSU, 35 °C); seasonal jellyfish | 2 mg/L chlorination + enhanced coagulation + ceramic UF pre-treatment | World’s largest hybrid desalination plant; AOM management is central to RO membrane protection |
| Sorek A, Palmachim | Israel | SWRO | 624,000 m³/day | Mytilus galloprovincialis; spring AOM bloom; seasonal jellyfish | Dual-stage multimedia filtration + UF pre-treatment; continuous low-level chlorination | Mediterranean coast; AOM events require enhanced coagulation; phased expansion from 150,000 m³/day |
| Shuqaiq 3 | Saudi Arabia | SWRO | 450,000 m³/day | Red Sea HAB events (dinoflagellates); AOM; water temperature 30–34 °C | Chlorination + coagulation + UF pre-treatment; deepwater intake reduces surface bloom impact | Red Sea SWRO standard; HAB events require enhanced pre-treatment response; deepwater intake design limits AOM exposure |
| Magtaa, Oran | Algeria | SWRO | 500,000 m³/day | Mytilus galloprovincialis; Mediterranean algae; seasonal AOM | Chlorination + drum screening + UF pre-treatment | Africa’s largest desalination plant at commissioning; Mediterranean seasonal fouling pattern with spring bloom peak |
| Jebel Ali complex | UAE | MSF + RO | 636,000 m³/day | Limited macrofouling (salinity >45 PSU inhibits larval survival); seasonal jellyfish; algal slime | Multi-port bar screening + shock chlorination; jellyfish barrier nets during bloom events | Extreme Gulf salinity restricts larval settlement; jellyfish management is the primary operational screening challenge |
| Fujairah 2 | UAE | Hybrid MSF + RO | 591,000 m³/day | Jellyfish (Aurelia spp.); seasonal algae; light macrofouling | Jellyfish screens + chlorination; coarse bar screening upstream | Gulf of Oman site; lower salinity than Arabian Gulf supports more jellyfish activity; AOM managed through pre-treatment |
| Kashiwazaki-Kariwa | Japan | Nuclear power station | 8,212 MW | Mytilus galloprovincialis; strong spring–summer seasonality | Chlorination 0.3 mg/L continuous + travelling band screens; ultrasonic antifouling system in operational trial | Ultrasonic treatment demonstrated biofouling reduction in operational conditions; standard chlorination remains primary control |
| Sydney (Kurnell) | Australia | SWRO | 250,000 m³/day | Mussels; barnacles; seasonal jellyfish; Tasman Sea storm debris | Chlorination + jellyfish barrier nets + drum screens | Operated on extended standby for much of service life; fouling management during periodic activation is critical |
| Carlsbad | USA (California) | SWRO | 189,000 m³/day | Mytilus californianus (California mussel); Balanus glandula | Chloramination continuous + duplex stainless screens; 316(b) low-velocity design from outset | Originally co-located with power station cooling intake; 316(b) compliance integral to design from first planning stage |
| Perth (Kwinana) | Australia | SWRO | 130,000 m³/day | Blue mussels (seasonal spring peak); barnacles; Indian Ocean storm events | Chlorination + drum screens + UF pre-treatment | Indian Ocean site; seasonal spring fouling peak; plant expanded; UF pre-treatment added to manage increased AOM load |
| Hadera (Orot Rabin) | Israel | SWRO | 127,000 m³/day | Mytilus galloprovincialis; AOM bloom events; jellyfish (spring–summer) | Chlorination + jellyfish net barriers + dual-stage UF pre-treatment | Jellyfish barrier net installed to prevent pre-treatment overload; AOM events managed through enhanced coagulation |
| Tuaspring | Singapore | SWRO | 113,500 m³/day | Year-round multi-species settlement; biomass exceeding 30 kg/m²; NE monsoon turbidity events | Chlorination 1 mg/L continuous + 7-day screen cleaning cycle | Equatorial location drives year-round fouling with no seasonal respite; highest fouling intensity in this dataset |
| Tampa Bay | USA (Florida) | SWRO | 95,000 m³/day | Barnacles; bryozoans; tunicates; Gulf of Mexico warm-water community (28–30 °C) | Chloramination; low-velocity intake design; 316(b) compliance from initial design | Gulf of Mexico warm water drives year-round biological activity; 316(b) compliance required subsurface intake assessment at design stage |
| Gladstone Power | Australia | Thermal power station | 1,680 MW | Perna viridis (green mussel); Saccostrea glomerata (Sydney rock oyster); tunicates | Chlorination 1 mg/L + antifouling coating on intake bay walls and tunnels | Antifouling coating effective for 6-year maintenance-free period on concrete intake surfaces; tunnels remained clean for same period |
| MAPS / Kudankulam | India | Nuclear power stations | 440 + 2,000 MW | Perna viridis at 23.6 kg/m² on FRP surfaces; heavy tropical settlement year-round | 0.2 mg/L continuous + 0.4 mg/L shock chlorination + antifouling coating on intake surfaces | 95% biomass reduction achieved; antifouling coating outperformed coal-tar epoxy significantly on FRP surfaces |
| Fuqing Nuclear | China | Nuclear power station | 6,000 MW | Crassostrea gigas (Pacific oyster); broken shells caused condenser damage in 2009 and 2016 | Mechanical bar screening + travelling band screen; ultrasonic antifouling trialled on intake structure | Shell fragmentation on screens is the primary mechanical risk; ultrasonic cavitation reduced fouling significantly in controlled trial conditions |
| Sirt Power Plant | Libya | Thermal power station | 600 MW | Mytilus spp. at 0–2 m depth; 23.8 kg/m² biomass; 83.7 mm mat thickness measured | Chlorination 0.5 mg/L + weekly screen cleaning; centre-flow band screens selected as primary | R&B Technical Assessment RB-TAS-LY-001; Mediterranean seasonal fouling with summer peak; TBS centre-flow selected; monitoring programme ongoing |
| Zawia | Libya | SWRO | 50,000 m³/day | Open Mediterranean coast; adjacent oil terminal elevates organic load; no natural shelter | Electrochlorination + dual-flow self-cleaning screens; 6 m depth offshore intake planned | R&B Technical Assessment; design phase; offshore GRP conduit with settlement basin intake arrangement; oil-terminal proximity a key water-quality variable |
| West Basin (pilot) | USA (California) | SWRO (proposed) | 100 MGD proposed | Mytilus californianus; Balanus glandula; Pacific barnacle community | Chloramination continuous + 2205 duplex stainless screens; subsurface beach wells assessed as 316(b) compliance route | 364-day pilot: zero macrofouling with chloramines; 2205 duplex stainless recorded lowest corrosion rate of all alloys tested; subsurface option deferred on cost grounds |
| Umm Al Houl | Qatar | SWRO | 590,000 m³/day | Limited macrofouling (42–44 PSU inhibits larval survival); seasonal jellyfish events; algal slime | Multi-port bar screening + jellyfish barrier nets + shock chlorination | Arabian Gulf conditions closely parallel Jebel Ali; jellyfish blooms (particularly spring) are the primary operational screening challenge |
| Az-Zour South | Kuwait | SWRO | 486,000 m³/day | Seasonal jellyfish events (Kuwait Bay — among the most frequent in the Gulf); algal slime; minimal macrofouling due to extreme salinity (43–46 PSU) | Bar screening + jellyfish nets + chlorination + UF pre-treatment | Kuwait Bay jellyfish events among most frequent recorded in the Arabian Gulf; peak summer temperatures (36 °C) effectively eliminate larval settlement windows |
| Agadir / Chtouka | Morocco | SWRO | 275,000 m³/day | Atlantic barnacles (Chthamalus spp., Balanus perforatus); Mytilus galloprovincialis; diatom mats from cold-water upwelling events | Chlorination + drum screening + UF pre-treatment; intake depth designed to reduce upwelling turbidity exposure | One of Africa’s largest SWRO plants; Atlantic upwelling coast — high turbidity events from upwelling are as significant a pre-treatment challenge as biological fouling; cooler water (16–24 °C) than Mediterranean reduces fouling rate |
| Barka 3 IWPP | Oman | SWRO | 210,000 m³/day | Perna viridis (green mussel); Balanus amphitrite; tubeworms; more active macrofouling than Arabian Gulf sites due to hospitable salinity | Chlorination + band screening; continuous dosing required (Gulf of Oman salinity 35–36 PSU supports larval survival unlike Arabian Gulf) | Gulf of Oman sites experience significantly more macrofouling than Arabian Gulf equivalents; Perna viridis dominant warm-season fouler; control regime closer to Mediterranean than Gulf practice |
| Ghubrah, Muscat | Oman | MSF + RO | 191,000 m³/day | Perna viridis; barnacles; biofilm; algal growth on exposed concrete surfaces | Chlorination + mechanical screening; multi-phase plant with operational history across both MSF and RO trains | Long operational record at same site provides valuable fouling trend data for Gulf of Oman; older MSF trains provide historical baseline against which RO intake performance is compared |
| Tianjin SDIC (Bohai Sea) | China | SWRO | ~100,000 m³/day | Mytilus edulis; cold-water barnacles (Balanus improvisus); heavy silt and sediment from Yellow River runoff; summer diatom bloom | Chlorination + coarse bar screening + fine band screens; silt and sediment management equally significant as biofouling control; heating provision against winter ice formation on screening structures | Only major dataset site in near-freezing winter conditions (Bohai Sea 0–28 °C seasonal range); fouling season compressed to April–October; ice management required in winter; Yellow River silt is primary pre-treatment challenge alongside seasonal biofouling |
| Carboneras | Spain | SWRO | ~65,000 m³/day | Mytilus galloprovincialis; Posidonia oceanica seagrass debris during storm events (unique Mediterranean challenge); spring AOM bloom | Chlorination + coarse bar screening + band screens; screen bar spacing designed to manage seagrass debris without blinding; EU Water Framework Directive compliance | Posidonia oceanica is a protected EU species; intake must handle debris without damaging seagrass meadows — an ecological constraint on intake positioning and cleaning strategy not seen outside the Mediterranean |
| Torrevieja | Spain | SWRO | ~65,000 m³/day | Mytilus galloprovincialis; barnacles; spring AOM; Posidonia seagrass debris in storm events; coastal water quality affected by adjacent salt lagoon | Chlorination + screening + UF pre-treatment to manage AOM events; discharge consent under EU Bathing Water Directive as well as WFD | Salt lagoon proximity influences intake water quality with elevated organics in summer; dual compliance with Bathing Water and WFD adds discharge constraint that shapes dosing strategy and dechlorination sizing |
| Beatrice Oil Field | United Kingdom | Offshore platform | N/A | Mytilus edulis at 80–100% surface cover to 10 m depth; 0.1 m individual length measured | Mechanical cleaning + antifouling coatings on structural members | North Sea cold water (8–14 °C) slows growth rate but does not prevent heavy fouling accumulation; standard North Sea practice |
Patterns that emerge when intake fouling records are read across climates, plant types and control strategies.
Warm-water sites — Singapore, India, tropical Australia, the southern Red Sea — consistently record fouling biomass three to five times higher than cold-water equivalents at the same elapsed time. The approximate doubling of bacterial growth rate with each 10 °C rise (Q₁₀ ≈ 2) propagates through every stage of the fouling succession: faster biofilm means earlier larval settlement cues, faster juvenile growth and more rapid progression to hard calcareous macrofouling. A dosing regime calibrated on a temperate site will underperform severely if applied without adjustment in tropical water. Singapore’s Tuaspring dataset — 30+ kg/m² biomass, 1 mg/L continuous dose, 7-day cleaning cycle — is the clearest demonstration of what year-round tropical fouling demands.
West Basin pilot data and Tampa Bay operational records both show that continuous chloramination — combined chlorine as monochloramine — provides a more stable residual through long intake pipelines than free chlorine, which decays rapidly in warm, organic-rich seawater. The trade-off is slower biocidal action: chloramination suppresses settlement and biofilm without the shock-kill effect that free-chlorine pulses deliver against adult mussels. Pacific coast US sites have converged on chloramination as their standard continuous-dosing strategy, supplemented by periodic higher-dose free-chlorine shocks during peak settlement seasons. Mediterranean and Gulf sites, with shorter intake pipelines, typically rely on free chlorine throughout.
Gladstone Power demonstrated a six-year effective life for antifouling coating on concrete intake bay walls and tunnels. MAPS / Kudankulam data shows antifouling coating on FRP surfaces achieving 95% biomass reduction against uncoated control panels. However, in no dataset does coating alone eliminate the need for periodic mechanical cleaning or chemical dosing — it extends the cleaning interval and reduces the chemical load required, not the need for the control programme itself. Coatings perform best as one layer of a defence-in-depth approach alongside dosing, and their selection must account for seawater temperature, fouling community, surface substrate and the mechanical loads imposed by cleaning operations.
Every subsurface intake site in the dataset — beach wells, infiltration galleries and horizontal collector wells — recorded zero macrofouling. The sediment column acts as a continuous biological filter that removes larvae, plankton and all organisms large enough to settle on intake surfaces. The fouling challenge shifts entirely to iron and manganese management, sulphate-reducing bacteria (SRB) biofilm on pump casings and column pipe, and well screen blinding by iron-oxidising bacteria. West Basin assessed beach wells as a viable 316(b) compliance route, ultimately deferring on cost grounds. Where ground conditions permit, subsurface intake options should always be evaluated at the feasibility stage — the whole-life chemical and maintenance saving is often underweighted against the higher capital cost in preliminary studies.
A specification starting point — site-specific CDD testing is required to determine actual dosing requirements.
| Climate zone | Typical temperature | Dominant macrofoulers | Fouling season | Typical peak biomass | Dosing strategy |
|---|---|---|---|---|---|
| Tropical / equatorial | 26–32 °C year-round | Perna viridis, hydroids, tubeworms, tropical barnacles | Year-round (no seasonal respite) | 25–35 kg/m² at 12 months | Continuous 1–2 mg/L TRO; 7-day cleaning cycle minimum; intermittent shock to break established colonies |
| Arabian Gulf (hyper-saline) | 15–35 °C; >45 PSU | Algal slime; jellyfish; light macrofouling (extreme salinity inhibits larval survival) | Algae year-round; jellyfish spring–summer | <5 kg/m² macrofouling; heavy algal slime | Shock dosing for jellyfish events; continuous low-level for algae; enhanced coagulation for AOM spikes |
| Red Sea | 24–34 °C; 38–42 PSU | Mytilus spp. at depth; HAB dinoflagellates; AOM | HAB events spring and autumn; macrofouling year-round below 5 m | 10–20 kg/m² at depth | Chlorination + UF pre-treatment; deep intake design to avoid surface bloom; HAB response protocol required |
| Mediterranean | 14–28 °C (seasonal) | Mytilus galloprovincialis, barnacles, AOM spring bloom | April–October peak; some year-round activity in southern basin | 10–25 kg/m² at peak | Continuous 0.3–0.5 mg/L + intermittent shock; enhanced coagulation during spring AOM bloom |
| Warm temperate (subtropical) | 18–28 °C (seasonal) | Mytilus spp., Saccostrea, barnacles, bryozoans, tunicates | September–April (Southern Hemisphere); April–October (Northern) | 15–25 kg/m² at seasonal peak | Continuous 0.5–1 mg/L; intermittent shock; antifouling coating on concrete intake surfaces extends cleaning intervals |
| Cold temperate | 6–18 °C (seasonal) | Mytilus edulis, Semibalanus balanoides, hydroids | April–August peak; year-round mussel retention at depth | 10–20 kg/m² (slow growth, persistent) | Continuous 0.2–0.5 mg/L; annual mechanical cleaning; air-burst for passive screens; mechanical anti-fouling measures on platform structures |
| Pacific warm-temperate | 14–22 °C (seasonal) | Mytilus californianus, Balanus glandula | Spring–early summer peak settlement | 10–20 kg/m² at seasonal peak | Chloramination preferred for residual persistence in long pipelines; 316(b) low-velocity screen design standard; duplex alloy screens |
| Atlantic upwelling coast | 16–24 °C (cooler than Mediterranean due to upwelling) | Chthamalus spp., Balanus perforatus, Mytilus galloprovincialis, diatom mats | Spring–summer peak; upwelling events year-round | 8–18 kg/m² at peak | Chlorination + drum screening; turbidity management as significant as biofouling; intake depth selection critical to avoid worst upwelling plumes |
| Cold semi-enclosed (Bohai / Yellow Sea) | 0–28 °C (extreme seasonal range); ~30 PSU | Mytilus edulis, Balanus improvisus; heavy silt load (Yellow River runoff); summer diatom bloom | April–October only; winter near-dormant | 5–12 kg/m² in growing season | Chlorination compressed to warm season; silt and sediment management dominates pre-treatment design; ice prevention on screening structures in winter |
Reynolds & Bauhm has assessed intake biofouling across Mediterranean, Arabian Gulf, tropical and temperate sites. We design the dosing strategy, screen specification and material selection as a single, integrated scope — from the CDD study to the discharge consent check.
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