Fishery WWTP serves fish processing, canning, fishmeal production and aquaculture packaging plants. Characterized by high organic load and salt tolerance challenges.
Fish wastewater: BOD 1,500-5,000 mg/L, COD 3,000-12,000 mg/L, FOG 500-3,000 mg/L, salinity 5,000-30,000 mg/L (seawater use), total nitrogen 200-800 mg/L from protein.
Arsistek fishery solutions: DAF, anaerobic UASB/EGSB, halophilic activated sludge and odor control. Recovered fish oil and protein become animal feed or fertilizer.
Fish Processing Wastewater
Four main streams: thawing, cutting/cleaning, cooking/evaporation, equipment/floor wash. Total flow 5-15 m³/ton product.
Defining feature is salinity — TDS reaches 30,000 mg/L in marine fish plants. Standard biology fails. Requires halophilic culture or freshwater dilution.
High protein causes ammonia release and severe odor. Plant air at -50 Pa with biofilter or chemical scrubbing.
Halophilic Biological System
Halophilic bacteria culture for high salinity. Halobacterium and halophilic Pseudomonas strains thrive at 30,000 mg/L TDS.
Adaptation 4-8 weeks. MBR design boosts efficiency via high MLSS.
Protein and Oil Recovery
DAF float has 30-50% oil + 20-30% protein. Centrifuged for separation.
Oil: fish oil for omega-3 if food-grade, biodiesel otherwise. Protein: animal feed or organic fertilizer.
Odor Management
Odor is a regulatory and public-relations priority. Turkish Odor Control Regulation applies.
Three-layer strategy:
- Source isolation: Sealed sewers, no aeration in equalization
- Air collection: Plant at -30 to -50 Pa, exhaust manifold
- Air treatment: Biofilter (wood chips + peat) or chemical scrubber (NaOCl/H2SO4) — 95%+ odor removal
Targets: H2S <0.5 ppm, NH3 <5 ppm.
Fishery Sector Advantages
Fishery Industry References
8 images coming soon — stay tuned for our reference projects and facility photos.
Frequently Asked Questions
Above 5,000 mg/L standard bacteria undergo osmotic shock — cell contents leak. Halophiles have intracellular salt-balancing mechanisms, working up to 30,000 mg/L.
Yes. Recovered fish oil sells at 200-800 USD/ton. If not food-grade, biodiesel/soap. ROI 2-3 years.
Plant at negative pressure (-30 to -50 Pa); all air routed to biofilter/scrubber. Closed systems at sources (sinks, sewers, tanks). Reduces complaints by 95%+.
Canning: hot, low fat, balanced pH. Fishmeal: very high COD (15,000+ mg/L), volatile fatty acids, severe odor. Fishmeal needs additional anaerobic stage.
Aquaculture effluent has lower COD (200-800 mg/L) but high volume. RAS (recirculating aquaculture) common. Antibiotic residues must be monitored.
Requires deep-sea outfall permit. Standard limits: COD <250, BOD <50, TSS <40 mg/L. Stricter near sensitive coastal zones.