Large consumption of flocculants and chemical disinfectants resulted in excess chemical sludge and high O&M cost
2. Raw Water & Discharge Standard
2.1 Influent Water Quality (Biochemical Effluent)
|
Parameter
|
Value Range
|
Average
|
|
CODcr
|
80–120 mg/L
|
105 mg/L
|
|
BOD₅
|
15–25 mg/L
|
20 mg/L
|
|
SS
|
15–25 mg/L
|
20 mg/L
|
|
Colority
|
30–50 times
|
42 times
|
|
Fecal Coliform
|
1.2×10⁴ CFU/L
|
—
|
|
pH
|
7.0–8.2
|
7.6
|
2.2 Discharge & Reuse Standard
Meet GB 19821-2005 Brewery Water Pollutant Discharge Standard and industrial intermediate water reuse standard for cooling tower makeup, site rinsing and auxiliary CIP water.
Target Effluent: COD ≤50 mg/L, Colority ≤10 times, Fecal Coliform undetected, no residual ozone.
3. Process Flow & Ozone System Technical Parameters
3.1 Overall Process Flow
Biochemical Effluent → Precision Sand Filter → Ozone Catalytic Oxidation Reactor → Activated Carbon Polishing Tank → Reuse Water Tank
3.2 Core Ozone System Technical Specifications
-
Ozone Generator Type: Oxygen-fed, water-cooled industrial ozone generator
-
Raw Oxygen Purity: ≥90% vol, dew point ≤-40 ℃
-
Ozone Gas Concentration: 120 g/m³ (standard industrial grade)
-
Total Ozone Output: 850 g/h (matched for 2,000 m³/day throughput)
-
Applied Ozone Dosage: 42 mg/L (catalytic oxidation mode)
-
Ozone Utilization Efficiency: ≥82% (venturi jet + titanium micro-pore aeration)
-
Reactor HRT: 40 min (2-stage plug-flow contact tank to avoid short circuit)
-
Optimal pH Range: 7.0–9.0 (inlet water natural pH without adjustment)
-
ORP Automatic Control: Maintain 280–380 mV linkage for dynamic ozone dosing
-
Tail Gas Treatment: Thermal decomposition destructor, residual ozone emission ＜0.1 ppm
-
Power Supply: 380V/50Hz, total power consumption: 1.15 kWh/m³ wastewater
3.3 Catalyst & Post-treatment
Composite metal oxide catalyst filling rate 60%; activated carbon filter empty bed contact time 15 min for residual ozone decomposition and trace organic adsorption.
4. Treatment Performance & Operational Data
4.1 Stable Effluent Quality (12-month Average Data)
|
Parameter
|
Influent
|
Effluent
|
Removal Rate
|
|
CODcr
|
105 mg/L
|
42 mg/L
|
60.0%
|
|
Colority
|
42 times
|
6 times
|
85.7%
|
|
SS
|
20 mg/L
|
≤5 mg/L
|
75.0%
|
|
Fecal Coliform
|
1.2×10⁴ CFU/L
|
Not Detected
|
99.99%
|
|
Odor
|
Obvious fermentation odor
|
Odor-free
|
—
|
4.2 Key Field Performance
-
Complete degradation of melanoidin and polyphenolic chromophores, eliminating tailwater yellowing and plant area odor
-
Effective decomposition of surfactants, eliminating foam overflow in biochemical system
-
No residual chlorine compounds, safe for food-grade factory water reuse
-
Real-time ORP linkage dosing realizes unmanned automatic operation
5. Core Advantages of Ozone Technology in Brewery Wastewater
5.1 Oxidation & Water Quality Upgrade
Ozone (2.07 V oxidation potential) and hydroxyl radicals (2.80 V) non-selectively break refractory aromatic organics, realizing high-efficiency decolorization and deep COD reduction. It solves the bottleneck that traditional biochemistry and coagulation cannot remove residual recalcitrant pollutants.
5.2 Zero Chemical Sludge & Low Maintenance
On-site ozone generation, no storage and transportation of chemicals. It reduces flocculant and disinfectant consumption by over 90%, produces no additional chemical sludge, and cuts sludge disposal costs significantly compared with Fenton and coagulation processes.
5.3 Food Industry Safety Compliance
No disinfection by-products (trihalomethanes). Residual ozone self-decomposes into oxygen without secondary pollution, avoiding stainless steel equipment corrosion caused by chlorine-based agents, fully compliant with food and beverage production safety regulations.
5.4 Biochemical System Optimization
Ozone pre-oxidation breaks macromolecular organics into small molecules, raises B/C ratio by 0.15–0.3, enhances anti-shock load capacity of biochemical tanks, and inhibits filamentous bacteria sludge bulking.
5.5 Water Reuse & Energy Saving
Polished effluent can be stably reused for cooling water makeup, bottle pre-rinsing and site cleaning, reducing municipal water intake by 28% for the brewery.
6. Economic Benefit Analysis
-
Total O&M Cost: USD 0.18 per cubic meter (including oxygen, power and catalyst depreciation)
-
Water Saving Benefit: Annual tap water cost reduction: USD 32,600
-
Sludge Disposal Saving: 35% reduction in total sludge output, annual cost saving: USD 14,200
-
Chemical Agent Saving: Cancelation of decolorant and peracetic acid disinfection, annual saving: USD 18,500
-
Payback Period: Full system investment recovered within 2.1 years
7. Conclusion
The oxygen-fed ozone catalytic oxidation system perfectly matches the characteristics of high-color, recalcitrant brewery wastewater. With stable effluent reaching reuse standards, zero chemical sludge, food-grade safety and outstanding economic returns, it becomes the optimal tertiary treatment upgrade solution for medium and large-scale breweries to achieve discharge standard compliance, water resource recycling and low-carbon operation.
