Customization Residential Wastewater Treatment Systems Sewage Treatment Systems

Introduction to Wastewater Treatment Equipment and General Process Flow

I. Classification of Wastewater Treatment Equipment

1. By Wastewater Source

• Domestic Wastewater Treatment Equipment:
  Processes household sewage (e.g., toilet, kitchen, and laundry wastewater), focusing on organic matter (COD, BOD₅) and suspended solids (SS) removal.
• Industrial Wastewater Treatment Equipment:
  Customized for specific industries (e.g., chemical, textile, food processing), addressing contaminants like heavy metals, oils, and high-concentration organics.
• Municipal Wastewater Treatment Equipment:
  Handles large-scale urban sewage, integrating pretreatment, biological treatment, and sludge management to meet stringent discharge standards.

2. By Treatment Process

• Physical Treatment Equipment:
  Grilles, sedimentation tanks, clarifiers, filters (sand/activated carbon), and membrane systems (UF, MF) for solid-liquid separation.
• Chemical Treatment Equipment:
  Dosing systems (coagulants, flocculants, disinfectants), pH adjustment tanks, and advanced oxidation processes (e.g., ozone generators).
• Biological Treatment Equipment:
  Activated sludge reactors (e.g., aeration tanks, SBR, MBR), anaerobic digesters, and biofilm systems (trickling filters, moving bed biofilm reactors).
• Advanced Treatment Equipment:
  Reverse osmosis (RO) units, ion exchange columns, UV disinfection systems, and evaporation crystallizers for high-purity water production.

II. General Process Flow

1. Pretreatment

• Screening & Grit Removal:
  • Bar Screens: Remove large debris (e.g., sticks, plastics) to protect downstream equipment.
  • Grit Chambers: Sediment heavy inorganic particles (sand, gravel) through gravity separation.
• Equalization Tanks:
  Buffer flow and concentration fluctuations to stabilize subsequent treatment processes.

2. Primary Treatment

• Sedimentation Tanks:
  Remove settleable solids through gravity, reducing SS by 50-70% and organic load by 30-40%.
• Optional Processes:
  • Dissolved Air Flotation (DAF): For oily wastewater or low-density solids removal.
  • Chemical Coagulation: Enhances particle aggregation for better sedimentation.

3. Secondary Treatment (Biological)

• Activated Sludge Process:
  • Aeration Tanks: Microorganisms degrade organic matter into CO₂ and water under aerobic conditions.
  • Secondary Clarifiers: Separate biomass (activated sludge) from treated water; sludge is partially recycled.
• Variants:
  • A/O (Anaerobic-Oxic) Process: Removes nitrogen and phosphorus through sequential anaerobic and aerobic zones.
  • MBR (Membrane Bioreactor): Combines biological treatment with membrane filtration for superior effluent quality (SS < 10 mg/L).

4. Tertiary Treatment (Advanced Purification)

• Filtration:
  Sand/anthracite filters or membrane systems (UF/RO) remove residual solids and dissolved contaminants.
• Disinfection:
  Chlorination, UV irradiation, or ozone treatment to inactivate pathogens (e.g., E. coli, viruses).
• Nutrient Removal:
  Chemical precipitation (for phosphorus) or biological processes (nitrification-denitrification).

5. Sludge Treatment

• Thickening & Dewatering:
  Reduce sludge volume via gravity thickeners, belt filter presses, or centrifuges (moisture content from 99% to 75-85%).
• Stabilization:
  • Anaerobic Digestion: Convert organic sludge to biogas (methane) for energy recovery.
  • Composting: Aerobic decomposition with bulking agents (e.g., wood chips) to produce biofertilizer.
• Final Disposal:
  Landfill, incineration, or land application (if meeting regulatory standards).

III. Typical Applications & Process Selection

IV. Key Considerations for Equipment Selection

1. Water Quality & Flow:
   Analyze contaminants (COD, heavy metals, pH) and design capacity (e.g., 1,000 m³/day).
2. Regulatory Compliance:
   Adhere to national (e.g., GB standards) or local discharge limits (e.g., coastal areas stricter for nitrogen).
3. Cost-Benefit Analysis:
   • Capital Cost: MBR systems are costlier but save space; conventional activated sludge is more affordable.
   • Operational Cost: Energy (aeration ~50% of total cost), chemical dosing, and sludge disposal.
4. Footprint & Automation:
   • Modular/containerized systems for limited space (e.g., mobile wastewater treatment units).
   • PLC/DCS control for real-time monitoring and remote operation.

                                                                                             Shenzhen Hongjie Water Technology Co., LTD 

Shenzhen Hongjie Water Technology Co., Ltd. is a high - tech enterprise specializing in water treatment and environmental protection, dedicated to providing customers with comprehensive engineering solutions in the fields of pure water preparation, wastewater treatment and waste gas treatment. Headquartered in Shenzhen, relying on the innovative resources and technological advantages of the Guangdong - Hong Kong - Macao Greater Bay Area, the company has been deeply engaged in the environmental protection industry, driving green development with technology and contributing to the harmonious win - win of ecology and economy.

Core Business Areas 

Pure Water Systems: Offering customized solutions for industrial ultrapure water, pharmaceutical purified water, and electronic-grade high-purity water, applied in industries such as electronics semiconductors, biopharmaceuticals, and food & beverages. The solutions ensure water quality safety and stability, meeting demanding production needs.

Wastewater Treatment: Providing treatment technologies for industrial wastewater (including difficult-to-treat wastewater), domestic sewage, and reclaimed water, using membrane separation, biochemical treatment, advanced oxidation, and other processes to achieve compliance with discharge standards and resource recovery.

Waste Gas Treatment: Designing efficient purification systems for pollutants such as VOCs (volatile organic compounds), acidic and alkaline gases, and dust, combining adsorption, catalytic combustion, and biological degradation technologies. These systems help enterprises comply with environmental regulations and achieve clean production.

Technological Advantages

The company takes innovation as the engine, gathers senior environmental protection engineers and scientific research team, has a number of independent intellectual property rights of patented technology, and we have established strategic cooperation with famous universities and environmental protection organizations at home and abroad.Through intelligent control system, modularized equipment integration and full life-cycle services, we provide energy-saving, efficient, stable and reliable environmental protection engineering services.

Through intelligent control system, modularized equipment integration and full life cycle service, we provide customers with energy-saving, efficient, stable and reliable environmental protection engineering services.

Project Experience

With years of industry expertise, Hongjie Water has completed hundreds of environmental engineering projects, serving clients across sectors including electronics manufacturing, chemicals, new energy, and municipal utilities. We have earned client trust through a “turnkey project” model, establishing a reputation for “technical expertise and efficient service.”

Certifications & Honors

The company is certified under ISO Quality Management Systems and has been awarded titles such as "National High-Tech Enterprise" and "Guangdong Provincial Environmental Protection Industry Backbone Enterprise." We actively participate in the formulation of industry standards, continuously leading technological innovation in environmental protection.

Development Concept

Upholding the mission of "Purifying Water Sources, Guarding Blue Skies" , Hongjie Water remains steadfastly committed to customer needs, driven by technological innovation, and focused on sustainable development. We provide smarter, greener environmental solutions for global clients, contributing to the building of a low-carbon future.