Wastewater Treatment

industrial wastewater
Municipal sewage
domestic sewage

Wastewater can be broadly categorized based on its origin and chemical composition, which dictates the required treatment technology:

Industrial Wastewater

 This refers to water and liquid waste discharged during industrial production processes. It contains raw materials, intermediate products, and by-products lost during manufacturing, along with various pollutants generated throughout the process. Due to its complex chemical makeup, industrial wastewater is a primary driver of environmental degradation, particularly water pollution.

Municipal & Domestic Sewage

Municipal sewage primarily originates from domestic activities and human life. Domestic sewage is the wastewater discharged from residential and public buildings, such as houses, offices, schools, hospitals, and commercial areas. It mainly consists of organic waste and human excreta, including greywater from kitchens, showers, and laundry, as well as blackwater from toilets.

The Challenge: Complex Pollutants & Environmental Risks

Industrial wastewater is a primary driver of water pollution, containing complex mixtures of raw materials and production by-products.

  • High Toxicity: Contains lost production materials and intermediates that are hazardous to ecosystems.
  • Complex Composition: Fluctuating chemical makeup makes standard treatment ineffective.
  • Regulatory Pressure: Stringent discharge standards require advanced technologies to avoid heavy fines.

The Conclusion

“Effective industrial wastewater treatment is not just a compliance requirement—it is a critical safeguard for sustainable production and environmental protection.”

Our Solution: Advanced Industrial Purification

We provide integrated systems designed to remove specific industrial pollutants, ensuring stable discharge and supporting Zero Liquid Discharge (ZLD) goals.

The Challenge: Organic Waste & Pathogen Control

Municipal sewage originates from daily activities in residential and public facilities, carrying a high load of organic waste.

  • Biological Load: High concentrations of household waste and metabolic by-products.
  • Greywater & Blackwater: Complex flows from kitchens, laundries, and sanitation systems.
  • Public Health: Presence of pathogens and bacteria requires high-level disinfection.

The Conclusion

“Transforming urban sewage into reusable water resources is key to solving water scarcity and maintaining public hygiene standards.”

Our Solution: High-Efficiency Biological Treatment

Utilizing high-performance MBR (Membrane Bioreactor) and specialized biological processes to produce high-quality reclaimed water from domestic sources.

The Challenge: Water Scarcity & Resource Waste

Discharging treated wastewater without reuse leads to a significant loss of valuable water resources.

  • High Water Costs: Relying solely on freshwater for industrial cooling or irrigation is increasingly expensive.
  • Environmental Impact: Continuous groundwater extraction causes ecological imbalance.
  • Zero Discharge Demands: More regions now require industrial facilities to recycle water to meet environmental quotas.

The Conclusion

“Wastewater should not be viewed as waste, but as a valuable ‘second source’ of water that is essential for a circular economy.”

Our Solution: Advanced Water Recycling Systems

We implement Ultrafiltration (UF) and Reverse Osmosis (RO) technologies to transform effluent into high-quality reclaimed water for cooling, irrigation, and industrial processes.

Industrial Wastewater Treatment

Industrial Wastewater Treatment System

General Purpose · Physicochemical + Biological Process · Discharge to Standard / Reuse

PRE-TREATMENT PHYSICOCHEMICAL BIOLOGICAL TREATMENT DEEP TREATMENT SLUDGE / OUTPUT INDUSTRIAL Wastewater Inlet BAR SCREEN Coarse Solids Removal EQUALIZATION Tank · Flow/Load Balancing pH Adjustment OIL LAYER OIL/GREASE SEP. API / DAF Separator Oil < 10 mg/L GRIT CHAMBER Sand/Grit Removal Flow velocity control + pH Adjust / NaOH / H₂SO₄ PRIMARY CLARIFIER SS removal 50–70% COAGULATION / FLOCCULATION + Coagulant (PAC/FeCl₃) + Flocculant (PAM) DISSOLVED AIR FLOTATION (DAF) Suspended solids / oils pH 6–9 NEUTRALIZATION pH Correction Tank pH sensor + dosing control PRIMARY SLUDGE ANOXIC TANK Denitrification NO₃⁻ → N₂ ↑ HRT 4–8 h AERATION AEROBIC REACTOR Activated Sludge / MBR BOD / COD / NH₄⁺ removal OXIC / NITRIFICATION Nitrification NH₄⁺ → NO₃⁻ DO 2–4 mg/L SECONDARY CLARIFIER Sludge settling SS < 30 mg/L effluent RETURN ACTIVATED SLUDGE (RAS) EXCESS SLUDGE SAND / MEDIA Filter (Tertiary) SS < 5 mg/L ACTIVATED CARBON + Advanced Oxidation (O₃/Fenton) COD / color / odor removal ADVANCED TREATMENT DISINFECTION UV / NaClO / Cl₂ EFFLUENT TANK Final Holding / Monitoring TREATED EFFLUENT Discharge to Standard OR Reuse COD < 50 mg/L · SS < 10 mg/L NH₄⁺ < 5 mg/L · pH 6–9 SLUDGE THICKENER Gravity / Mechanical DIGESTER Anaerobic · Biogas recovery Optional DEWATERING Belt / Screw / Centrifuge Press SLUDGE CAKE Moisture ≤ 80% Landfill / Incineration Composting / Reuse WATER QUALITY REFERENCE — INDUSTRIAL WW INLET (typical) COD 500–5000 mg/L SS 200–1000 mg/L NH₄⁺-N 20–100 mg/L AFTER BIO TREATMENT COD 60–120 mg/L BOD < 20 mg/L SS < 30 mg/L DISCHARGE TARGET COD < 50 mg/L BOD < 10 mg/L SS < 10 mg/L NH₄⁺-N < 5 mg/L TN < 15 mg/L pH 6–9 Standard: GB 8978 Integrated Wastewater Discharge Standard (Class I / Class II)
Main Process Flow
Sludge Stream
Return Activated Sludge
Chemical Dosing
Final Discharge / Reuse
Municipal Wastewater Treatment

Municipal & Domestic Wastewater Treatment

A²/O Biological Nutrient Removal Process · Discharge Class 1A / Reuse Standard

PRELIMINARY PRIMARY TREATMENT A²/O BIOLOGICAL (BNR) TERTIARY TREATMENT SLUDGE / OUTPUT SEWAGE INLET Domestic / Municipal COARSE SCREEN ≥ 20 mm solids FINE SCREEN 1–6 mm solids GRIT & GREASE Removal Chamber Aerated grit tank PUMP STATION Influent Lift Pumps PRIMARY CLARIFIER SS removal 50–60% PRIMARY SLUDGE FLOW EQUALIZATION Buffer / Surge Tank Flow smoothing INFLUENT BOD ~200 mg/L SS ~220 mg/L CHARACTERISTICS TN ~40 · TP ~5 mg/L ANAEROBIC Phosphorus Release PO₄³⁻ release HRT 1–2 h ANOXIC Denitrification NO₃⁻ → N₂ ↑ HRT 2–4 h AERATION · DO 2–4 mg/L AEROBIC ZONE Nitrification + P-uptake NH₄⁺→NO₃⁻ · PO₄³⁻ uptake SECONDARY CLARIFIER Biomass separation INTERNAL RECYCLE (MLSS) RETURN ACTIVATED SLUDGE (RAS) EXCESS SLUDGE SAND FILTER Tertiary Filtration SS < 5 mg/L Turbidity < 1 NTU CHEMICAL P-REMOVAL FeSO₄ / AlCl₃ dosing TP < 0.5 mg/L ADVANCED NUTRIENT + UV DISINFECTION E. coli < 1000 /L ONLINE MONITORING COD · NH₃-N · TN · TP Flow · pH · DO · Turbidity EFFLUENT MONITORING Real-time discharge control TREATED EFFLUENT Class 1A Discharge Standard COD < 50 · BOD < 10 · SS < 10 mg/L NH₄⁺ < 5 · TN < 15 · TP < 0.5 mg/L River / Reclaimed Water Reuse SLUDGE THICKENER Gravity thickening ANAEROBIC DIGESTER Biogas (CH₄) recovery VS reduction ≥ 40% DEWATERING Centrifuge / Belt Press BIOSOLIDS CAKE Moisture ≤ 80% Land Application Composting / Incineration WATER QUALITY REFERENCE — MUNICIPAL WW RAW SEWAGE (typical) BOD 150–250 mg/L COD 300–600 mg/L SS 150–250 mg/L TN 30–60 mg/L TP 4–10 mg/L CLASS 1A TARGET (GB 18918) COD < 50 mg/L BOD < 10 mg/L SS < 10 mg/L NH₄⁺-N < 5 mg/L TN < 15 mg/L TP < 0.5 mg/L E. coli < 1000 /L Standard: GB 18918-2002 Municipal WWTP Pollutant Discharge Standard Class 1A — Highest Grade Suitable for reuse / sensitive water body discharge
Main Process Flow
Sludge Stream
RAS / Internal Recycle
Chemical Dosing
Final Effluent (Class 1A)

Pure Water No.1 is a premier ultrapure water equipment manufacturer dedicated to supporting Design Firms and EPCs with cutting-edge water treatment solutions. We bridge the gap between complex engineering requirements and sustainable industrial performance.

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  • Ultrapure Water Systems (UPW)
  • EDI & Ion Exchange Systems
  • Reverse Osmosis (RO) Technology
  • Industrial Wastewater Recycling
  • Modular Water Treatment Plants

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📍14/F, Bldg C, Taohuayuan Innovation Park, Songgang, Baoan, Shenzhen, China

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