Comprehensive wastewater solutions for dairy processors. Australian AS 1210 & European PED/IED compliant systems with fat separation, protein recovery, and biogas production. Turn waste into value.
Nordic dairy wastewater standards. Norwegian, Swedish, Danish and Finnish effluent limits for milk and cheese processing.
Wastewater treatment for fluid milk processing plants. Handle CIP chemical consumption, spill milk and packaging residues.
Specialised wastewater treatment for dairy wastewater standards.
Australian dairy wastewater standards including AS 1210, AS/NZS 4020 and state EPA requirements for milk processing equipment.
Dairy wastewater is 5-10x stronger than domestic sewage. A single litre of milk lost to drain equals the organic load of 50-100 people, creating significant treatment challenges and costs.
The Problem: Dairy wastewater contains 2,000-50,000 mg/L BOD from milk solids, whey, and cleaning residues. A single litre of milk lost to drain equals the organic load of 50-100 people. This creates shock loads that overwhelm conventional treatment systems.
Impact: Sewer surcharge penalties (-12/kg BOD), treatment plant upsets, compliance violations, and potential production shutdowns.
Sources: Product spills, equipment washdown, CIP cycles, whey disposal, rejected batches, start-up/shutdown losses.
View BOD SolutionsThe Problem: Milk fats (200-1,000 mg/L) form stable emulsions with proteins and cleaning chemicals that resist gravity separation. Hot water cleaning (60-80°C) keeps fats liquid but they solidify in cooler sewers, causing blockages.
Impact: Pipe blockages, pump failures, fatbergs in sewer systems, trade waste violations, and expensive emergency callouts.
Sources: Butter, cream, cheese production, milk separation, equipment lubrication, floor washdown with hot water.
View Fat SeparationThe Problem: CIP (Clean-in-Place) cycles alternate between caustic soda (pH 12-14) for protein removal and acid (pH 1-3) for mineral scale. This creates pH shock that kills advanced biological treatment organisms.
Impact: Biological treatment failure, chemical requirements for neutralisation, compliance violations, and system downtime.
Sources: Caustic CIP (NaOH 1-2%), acid CIP (HNO3/H3PO4 0.5-1%), sanitizer rinse (peracetic acid), equipment cleaning.
View pH SolutionsThe Problem: Pasteurisation (72°C), CIP cycles (60-80°C), and hot water washdown create thermal shock. Hot wastewater (>40°C) damages advanced biological treatment and creates odour problems.
Impact: Biological treatment failure, excessive energy requirements for cooling, steam/odour emissions, and worker safety issues.
Sources: HTST pasteurizer blowdown, CIP final rinse, evaporator condensate, hot water sanitizing, boiler blowdown.
View Temperature SolutionsThe Problem: Cheese production generates 9 kg whey per 1 kg cheese. Whey has BOD 35,000-50,000 mg/L and cannot be discharged directly. Traditional disposal to sewer is increasingly restricted.
Impact: Massive disposal requirements, lost output opportunity, treatment plant overload, and environmental compliance issues.
Sources: Cheese making (curd separation), casein production, whey processing, Greek yogurt production (acid whey).
View Cheese WastewaterThe Problem: Milk proteins contain 5.7% nitrogen. Dairy wastewater can have 100-300 mg/L total nitrogen, causing eutrophication in receiving waters. Phosphorus from cleaning chemicals adds to the problem.
Impact: Nutrient enrichment of water bodies, algal blooms, strict discharge limits, and expensive nutrient removal requirements.
Sources: Milk proteins, whey, cleaning chemicals (phosphates), equipment corrosion inhibitors.
View Nutrient RemovalThe Problem: Dairy processing is seasonal (spring flush) with daily/weekly batch cycles. Weekend shutdowns, product changeovers, and seasonal milk supply create highly variable flows and loads.
Impact: Treatment system instability, poor performance during peak loads, oversized equipment for average conditions, and compliance challenges.
Sources: Seasonal milk supply, production scheduling, CIP frequency changes, product mix variations.
View Flexible SystemsThe Problem: Surfactants, sequestrants, and sanitizers in CIP chemical consumption can interfere with wastewater treatment. Quaternary ammonium compounds (quats) are particularly toxic to biological systems.
Impact: Biological treatment toxicity, poor solids separation, foam generation, and increased chemical consumption.
Sources: Detergents, sanitizers (quats, chlorine), defoamers, scale inhibitors, corrosion protection chemicals.
View Chemical TreatmentSolution: Dissolved Air Flotation (DAF) is the proven primary treatment for dairy wastewater. Reynolds & Bauhm systems achieve 95-99% fat removal and 70-85% TSS removal with optimised polymer chemistry.
Key Features:
Performance: Inlet FOG 500 mg/L → Outlet < 15 mg/L
View DAF SystemsSolution: Turn waste into output with ultrafiltration (UF) systems that concentrate whey proteins into valuable WPC (Whey Protein Concentrate) products.
Key Features:
project benefits: WPC 35 @ = -500,000/year for medium cheese plant
View Whey RecoverySolution: High-strength dairy wastewater (COD > 4,000 mg/L) is ideal for anaerobic treatment. UASB or EGSB reactors produce biogas while achieving 80-90% COD removal.
Key Features:
project benefits: Energy benefits -200,000/year; carbon credits available
View Anaerobic SystemsSolution: Automated pH control with equalization tanks buffers CIP cycles and prevents advanced biological treatment shock.
Key Features:
Performance: pH 2-12 inlet → pH 6.5-8.5 outlet consistently
View pH ControlSolution: Moving Bed Biofilm Reactors provide robust aerobic treatment for dairy wastewater with high biomass inventory and shock load resistance.
Key Features:
Performance: BOD removal 90-95%; TSS < 30 mg/L
View MBBR SystemsSolution: Concentrate DAF float and biological sludge for disposal requirement reduction or resource recovery (animal feed, composting).
Key Features:
Efficiency: 70-80% reduction in disposal requirements and costs
View Screw PressesRemove large solids, curd particles, and debris
Buffer flow and load variations; initial pH adjustment
Remove fats, oils, and suspended solids
UASB/EGSB for high-COD streams; biogas production
Biological oxidation of remaining organics
Lamella clarifier or DAF for solids separation
Meet discharge limits or polish for reuse
| Stage | BOD (mg/L) | COD (mg/L) | TSS (mg/L) | FOG (mg/L) | Removal |
|---|---|---|---|---|---|
| Raw Wastewater | 2,000 - 10,000 | 4,000 - 20,000 | 500 - 2,000 | 200 - 1,000 | - |
| After Screening | 1,800 - 9,500 | 3,800 - 19,000 | 400 - 1,800 | 200 - 1,000 | 10-15% TSS |
| After DAF | 1,500 - 7,000 | 3,000 - 14,000 | 100 - 400 | < 15 | 95-99% FOG |
| After Anaerobic | 300 - 1,400 | 600 - 2,800 | 150 - 500 | < 10 | 80-85% COD |
| After Aerobic MBBR | < 50 - 100 | < 100 - 200 | < 50 - 100 | < 5 | 90-95% BOD |
| Final Discharge | < 30 | < 125 | < 35 | < 10 | 98-99% overall |
Primary screening to remove curd, cheese particles, and large solids. Fine screening: 0.5-3 mm perforations. Stainless steel 316L construction with internal spray wash system.
Compliance: EU 1935/2004 AS 1210
View ScreensFat, oil, and suspended solids removal from dairy wastewater. Recycled pressurised flow: 10-30%. Saturation pressure: 4-6 bar. Capacity: 1-200 m³/hr.
Compliance: PED 2014/68/EU AS 1210
View DAF SystemsAutomated polymer preparation and dosing for DAF optimisation. Two or three-chamber systems with 30-60 minute aging time. Flow-paced or load-based control.
Options: ATEX Available
View Polymer SystemsAnaerobic treatment of high-COD dairy streams with biogas recovery. Granular sludge bed technology. COD loading: 5-15 kg/m³/day. 3-phase separator design.
Compliance: PED 2014/68/EU ATEX
View Anaerobic SystemsAerobic advanced biological treatment with moving bed biofilm technology. HDPE carriers: 500 m²/m³ surface. Fill ratio: 50-70%. No sludge recirculation required.
Compliance: EU 1935/2004 Food-Grade
View MBBR SystemsSolids separation after advanced biological treatment. 60° plate inclination. Surface loading: 1-3 m/hr. Stainless steel or FRP construction with integrated sludge hopper.
Compliance: AS 1210 PED 2014/68/EU
View ClarifiersDewatering of DAF float and biological sludge. Multi-disc design achieving 18-22% dry solids. Low energy: 0.5-2 kW. 24/7 unattended operation.
Compliance: EU 1935/2004 Food-Grade
View Screw PressesFlow balancing and pH neutralisation. Retention: 8-24 hours. Stainless steel 316L or epoxy-coated steel with submersible mixers and pH monitoring/control.
Compliance: AS 1210 PED 2014/68/EU
View TanksCapacity: 50,000 L milk/day
Whey Production: 450,000 L/day
Challenge: Whey disposal requirements ; high BOD sewer charges
Solution:
Results:
AS 1210 Compliant
Capacity: 300,000 L milk/day
Wastewater: 1,500 m³/day
Challenge: High FOG causing sewer blockages; water scarcity for cooling
Solution:
Results:
PED 2014/68/EU, IED 2010/75/EU Compliant
Our dairy wastewater treatment systems are designed and manufactured to meet the strictest Australian and European standards for pressure equipment, food contact materials, and environmental compliance.
Related Dairy Resources
Overview of dairy wastewater treatment solutions for milk processing, cheese production, yogurt, and ice cream.
View OverviewAustralian AS 1210, AS/NZS 4020 and European PED, IED, EU 1935/2004 compliance for dairy wastewater equipment.
View StandardsNordic regulations for Norway, Sweden, Denmark, Finland, and Iceland dairy wastewater operations.
View Nordic StandardsEqualisation, CIP and neutralisation tanks for dairy wastewater management.
Equalization TanksCIP TanksFrom CIP shock to consent — the unit-process chain matched to dairy chemistry.
Required residence time 6–24 hours to dampen CIP spikes. Volume = 0.5–1.5x daily flow. Mixers at 5–10 W/m³ prevent solids settling and FOG layering.
Two-stage: coarse acid/alkali (NaOH or H₂SO₄) for >1 pH unit error, fine CO₂ trim. See pH correction hub, food & beverage pH and the comparative oil-gas pH case study for shared dosing infrastructure.
Coagulant FeCl₃ 100–400 mg/L + cationic polymer 1–5 mg/L. A/S ratio 0.02–0.04. Achievable: 95–99% FOG removal, 90–95% TSS removal. Skim sludge to rendering.
For COD >3,000 mg/L, anaerobic recovers methane. OLR 5–15 kg COD/m³·d; HRT 6–24 h. Biogas yield 0.30–0.40 m³ CH₄ / kg COD removed; useful CHP feed.
MBBR or activated sludge after anaerobic. F/M 0.15–0.30; MLSS 3,000–5,000. Achieves BOD <25 mg/L, COD <125 mg/L. SRT 12–20 days enables nitrification.
Sand filter + UV (or chlorine) for solids and pathogen reduction before discharge. Tertiary P precipitation with ferric (1.5–3.0 mol Fe/mol P) for <1 mg/L consent.
Our dairy specialists understand the unique challenges of milk processing wastewater. From fat separation to whey recovery and biogas production, we'll design a system that meets your regulatory requirements while maximising value recovery.
Our expertise spans multiple industries with sector-specific water treatment solutions.