Customization Residential Wastewater Treatment Systems Sewage Treatment Systems

Price Negotiable

Price: negotiation

MOQ: ≥1sets

Delivery Time: 1-7working days(depand on raw materials stocking)

Brand: Hongjie

Product Description

Introduction to Wastewater Treatment Equipment and General Process Flow

Wastewater treatment equipment is a comprehensive system designed to remove contaminants from wastewater through physical, chemical, and biological processes, enabling the treated water to meet discharge standards or be reused. Its primary objectives are to protect the environment, conserve water resources, and ensure public health. Below is a detailed overview of equipment categories, core processes, and typical workflows:

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

Wastewater Type	Core Processes	Target Standards
Domestic Sewage	Bar Screen → Grit Chamber → A²O/MBR → Disinfection	GB 18918-2002 Grade A (COD ≤ 50 mg/L)
Industrial Wastewater	Pretreatment → Chemical Precipitation → Biological Treatment → RO	Zero discharge or reuse (e.g., electronics industry)
Hospital Effluent	Pretreatment → Chlorination → Biological Treatment → UV Disinfection	Pathogen-free discharge (e.g., SARS-CoV-2 inactivation)

IV. Key Considerations for Equipment Selection

Water Quality & Flow:
Analyze contaminants (COD, heavy metals, pH) and design capacity (e.g., 1,000 m³/day).
Regulatory Compliance:
Adhere to national (e.g., GB standards) or local discharge limits (e.g., coastal areas stricter for nitrogen).
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.
Footprint & Automation:
- Modular/containerized systems for limited space (e.g., mobile wastewater treatment units).
- PLC/DCS control for real-time monitoring and remote operation.