Grey Water Treatment System Project Case

1. Case Basic Information

1.1 Project Subject

• Provider: HELLA WATER, a professional supplier of high-performance water treatment product, specializes in customized grey water treatment solutions for residential, commercial, and public scenarios.
• Core Products: Three types of grey water treatment systems (Sedimentation Filtration Device, Multi-stage Filtration System, MBR Integrated Equipment)
• Project Objective: Treat 500-3000L/H of grey water (toilet, laundry, kitchen, shower wastewater) to meet recycling or discharge standards, realizing water conservation and environmental protection.

1.2 Treatment Scale & Water Quality Parameters

Treatment Scale

System Type	Processing Capacity
Sedimentation Filtration Device	500L/H, 1000L/H, 3000L/H
Multi-stage Filtration System	500L/H, 1000L/H, 3000L/H
MBR Integrated Equipment	500L/H, 1000L/H, 3000L/H

Inlet Water Quality

Parameter	Value
pH	6–8
TDS (Total Dissolved Solids)	850 – 900 ppm
Turbidity	130 – 150 NTU
COD (Chemical Oxygen Demand)	100–500 mg/L (varies by grey water type)
BOD₅ (Biochemical Oxygen Demand)	50–200 mg/L (varies by grey water type)
Oil Content	10–50 mg/L (kitchen grey water) / <5 mg/L (toilet/laundry grey water)
Escherichia coli	10³–10⁵ CFU/100mL

Effluent Water Quality (By System Type)

System Type	Effluent Standards
Sedimentation Filtration Device	Turbidity <5 NTU; No pathogens; Suitable for toilet flushing/greening
Multi-stage Filtration System	Turbidity <3 NTU; TOC removal rate >80%; Odor-free; Suitable for car washing/cleaning
MBR Integrated Equipment (With MBR)	Turbidity <1 NTU; BOD <10 mg/L; Ammonia nitrogen <1.5 mg/L; Meets Class A discharge/reuse standard

1.3 Design Standards & Compliance

The systems adhere to core national and industrial standards, including:

• GB/T 18920-2022: Reclaimed Water for Urban Miscellaneous Use
• GB 50335-2016: Code for Design of Building Water Supply and Drainage and Heating Engineering
• JB2932-1999: Technical Specifications for Water Treatment Equipment
• ISO 9001: Quality Management System Certification

1.4 Application Scenarios

• Sedimentation Filtration Device: Low-pollution grey water (school toilets, office building washrooms) for toilet flushing/greening.
• Multi-stage Filtration System: Low-to-medium pollution grey water (laundry rooms, public bathrooms) for cleaning/car washing.
• MBR Integrated Equipment: High-organic matter grey water (communities, hotels, commercial kitchens/showers) for comprehensive reuse.

2. Project Core Pain Points & Requirements

2.1 Industry Common Pain Points

1. Variable Pollution Load: Grey water from different sources (toilet, kitchen, shower) has distinct pollutant compositions (oil, COD, surfactants), making unified treatment challenging.
2. Space Constraints: Residential and commercial areas have limited installation space, requiring compact or buried design.
3. Low Operation & Maintenance Capacity: Most users lack professional water treatment technicians, demanding simple, low-frequency maintenance.
4. Diverse Reuse Needs: Effluent may be used for flushing, greening, or car washing, requiring targeted water quality control.
5. Water Quality Fluctuations: Irregular water use leads to fluctuations in flow and pollutant concentration, affecting treatment stability.

2.2 Customer Core Requirements

• Targeted Treatment: Match system type to grey water pollution level (low/medium/high) for cost-effectiveness.
• Compact Design: Support fully buried/above-ground installation, adapting to limited space (0.8–4 m²).
• Easy Operation & Maintenance: Minimize manual intervention; maintenance frequency ≤ once per quarter.
• Compliant Reuse: Effluent meets corresponding water quality standards for intended use (flushing/greening/car washing).
• Customizable Configuration: Adapt to flow rate, power supply, and automation level (manual/semi-automatic/fully automatic).

3. Hella Water Customized Solutions

3.1 Three Types of Tailored Systems

3.1.1 Sedimentation Filtration Device (Low Pollution, Low Cost)

• Process Design: Gravity Sedimentation + Quartz Sand Filtration + 5μm PP Cotton Filtration + UV Disinfection.
• Core Configuration: Liftable ash collection tray (for slag removal); Quartz sand filter bed; UV sterilization lamp (254nm).
• Key Advantages:
  • Ultimate space optimization (fully buried design, only maintenance openings on the surface).
  • Zero biochemical sludge (pure physical treatment, no microbial management).
  • Low energy consumption (only UV requires power).
• Applicable Scenarios: Low-grease/low-COD grey water (toilet washrooms); Reuse for flushing/greening.
• Supporting System: Optional pre-grease trap for low-oil grey water, aligning with pre treatment filtration system standards.

3.1.2 Multi-stage Filtration System (Medium Pollution, Balanced Performance)

• Process Design: Self-cleaning Filter + 5μm PP Cotton Filtration + Granular Activated Carbon Adsorption + 1μm Sintered Carbon Filtration + UV/Chlorine Disinfection.
• Core Configuration: Pressure difference-triggered self-cleaning filter; Activated carbon layer (odor/residual chlorine removal); Dual disinfection (UV + backup chlorine).
• Key Advantages:
  • No biological management (no sludge generation); Automatic backwashing reduces maintenance.
  • Quick start (no microorganism cultivation, ready to use).
  • Modular expansion (parallel connection for flow increase).
• Applicable Scenarios: Low-to-medium pollution grey water (laundry rooms/public bathrooms); Reuse for cleaning/car washing.
• Supporting System: Integrated chemical dosing system for backup chlorine disinfection.

3.1.3 MBR Integrated Equipment (High Pollution, High Quality)

• Process Design: Anaerobic Tank + Aerobic Tank + MBR Membrane Separation + Sodium Hypochlorite/UV Disinfection.
• Core Configuration: Submersible mixer (anaerobic tank); Aerator (gas-water ratio 15:1); 0.1μm hollow fiber MBR membrane; PLC control system.
• Key Advantages:
  • Excellent effluent quality (meets Class A standard); Strong shock load resistance (MLSS 8,000–15,000mg/L).
  • 90% sludge reduction (sludge age up to 30 days); Unattended operation support.
• Applicable Scenarios: High-organic matter grey water (communities/hotels/kitchens); Comprehensive reuse.

3.2 Core Technical Highlights

Highlight	Description
Customizable Scale	500–3000L/H flow rate options to match different user needs.
Flexible Installation	Fully buried/above-ground/skid-mounted designs adapt to space constraints.
Gradient Cost Configuration	Three system types with different investment levels (low/medium/high) for cost optimization.
Intelligent Automation	PLC control supports real-time monitoring, automatic cleaning, and remote data transmission (optional).

4. Project Effectiveness Verification

4.1 Pollutant Removal Efficiency (By System Type)

Pollutant	Sedimentation Filtration Device	Multi-stage Filtration System	MBR Integrated Equipment (With MBR)
Turbidity	≥96.7% (150 NTU → <5 NTU)	≥98% (150 NTU → <3 NTU)	≥99.3% (150 NTU → <1 NTU)
TOC	–	>80%	≥85%
BOD₅	–	–	≥95% (200 mg/L → <10 mg/L)
Escherichia coli	100% (Pathogen-free)	100%	100% (<10 CFU/100mL)
Oil Content	≥80% (With pre-grease trap)	≥90%	≥95%

4.2 Operational Performance

• Stability: All systems operate stably under ±20% flow fluctuations; MBR system withstands ±30% COD concentration changes.
• Maintenance Frequency:
  • Sedimentation Filtration: Clean ash tray monthly; Replace PP cotton quarterly.
  • Multi-stage Filtration: Automatic self-cleaning; Replace activated carbon every 6 months.
  • MBR Equipment: Inspect quarterly; Clean membrane every 6 months.
• Energy Consumption:
  • Sedimentation Filtration: Very low (only UV power, ≈5–10W).
  • Multi-stage Filtration: Medium (self-cleaning + UV, ≈50–100W).
  • MBR Equipment: Higher (aeration + suction pump, ≈300–500W).

4.3 Economic & Environmental Benefits

• Water Conservation: Annual water savings ≈146–876 m³ (500L/H–3000L/H, 8 hours/day, 365 days/year).
• Cost Savings: Reduce freshwater purchase costs by 30–50% (based on 0.2 USD/m³ freshwater price).
• Environmental Impact: Reduce urban sewage discharge by 146–876 m³/year; Lower carbon footprint via water reuse.

5. Case Corresponding Product Quotation Description

5.1 Sedimentation Filtration Device Quotation

Flow Rate	Configuration	EXW Price (USD)	FOB Price (USD)	CIF Price (USD)
500L/H	Self-built sedimentation tank	1400	1800	2000
500L/H	Carbon steel sedimentation tank	2200	2600	3000
1000L/H	Self-built sedimentation tank	2000	2400	2800
1000L/H	Carbon steel sedimentation tank	3000	3500	4000
3000L/H	Self-built sedimentation tank	3300	3800	4200
3000L/H	Carbon steel sedimentation tank	5600	6300	7200

5.2 Multi-stage Filtration System Quotation

Flow Rate	EXW Price (USD)	FOB Price (USD)	CIF Price (USD)
500L/H	1600	2000	2200
1000L/H	2550	3000	3200
3000L/H	4850	5350	5800

5.3 MBR Integrated Equipment Quotation

Flow Rate	Configuration	EXW Price (USD)	FOB Price (USD)	CIF Price (USD)
500L/H	Without MBR	6000	6400	7200
500L/H	With MBR	7400	7800	8200
1000L/H	Without MBR	8650	9150	9650
1000L/H	With MBR	9800	10300	10800
3000L/H	Without MBR	11800	12400	13200
3000L/H	With MBR	15000	15600	16400

5.4 Quotation Terms

Term Type	Details
Validity Period	30 working days from the date of quotation
Customization	Support flow rate, material (316L stainless steel/FRP/PVC), and automation level customization (price varies)
Delivery Cycle	10–15 working days after order confirmation
Warranty Period	12 months from the date of delivery (free repair/replacement for non-human damage)
Additional Services	Free operation manual and online technical support; On-site installation guidance available at extra cost

6. Frequently Asked Questions (FAQ)

6.1 System Selection

Q: How to choose the right grey water treatment system?

A: Select based on grey water source and reuse purpose: 1) Toilet washrooms (low pollution) → Sedimentation Filtration Device; 2) Laundry/bathrooms (medium pollution) → Multi-stage Filtration System; 3) Kitchen/showers (high organic matter) → MBR Integrated Equipment. For large flow needs, multiple systems can be connected in parallel.

6.2 Installation & Space

Q: What are the space requirements for installation?

A: 1) Sedimentation Filtration Device: 0.8–1.2 m² (fully buried/above ground); 2) Multi-stage Filtration System: 1.5–3 m² (ground floor); 3) MBR Integrated Equipment: 2–4 m² (fully buried/above ground). All systems support customized design for narrow spaces.

6.3 Maintenance & Upkeep

Q: How often do the systems require maintenance, and is it complicated?

A: Maintenance is simple and low-frequency: 1) Sedimentation Filtration: Clean ash tray monthly, replace PP cotton quarterly (15 minutes per time); 2) Multi-stage Filtration: Automatic self-cleaning, replace activated carbon every 6 months; 3) MBR Equipment: Clean membrane every 6 months (PLC can automate cleaning). No professional technical background is required.

6.4 Customization & Automation

Q: Can the system be customized for outdoor installation or remote monitoring?

A: Yes. We offer UV-resistant housings for outdoor use and IoT modules for real-time data remote transmission (cost +15%). Automation levels can be selected: manual, semi-automatic (automatic cleaning), or fully automatic (backup unit switch, cost +20%).

6.5 Effluent Safety & Reuse

Q: Is the treated effluent safe for direct reuse (e.g., greening, car washing)?

A: Yes. Each system’s effluent meets corresponding reuse standards: 1) Sedimentation Filtration: Safe for greening/toilet flushing; 2) Multi-stage Filtration: Suitable for car washing/cleaning; 3) MBR Equipment: Meets Class A standard, usable for comprehensive scenarios. We provide third-party water quality testing reports for verification.

Would you like me to prepare a detailed system selection guide that includes a questionnaire to confirm grey water parameters, space constraints, and reuse needs, helping you quickly match the most suitable solution?