1. Case Basic Information
1.1 Company Overview
Hella Water Treatment Equipment Technology Co., Ltd. is a leading provider of large-scale municipal water treatment solutions, specializing in integrated water purification systems for public utilities. With over 20 years of industry experience, the company adheres to international standards (ASTM, ISO) and offers end-to-end services from project design, production, on-site installation to after-sales support. Its products are deployed globally, delivering reliable water supply solutions for cities, towns, and rural areas. For more municipal water supply solutions, visit [municipal water supply subject].
1.2 Project Background
This project is located in Kabul, Afghanistan, aiming to address the local demand for safe and clean drinking water and irrigation water. The municipal water source (e.g., surface water, groundwater) contains suspended solids, organic pollutants, pathogens, and heavy metals, requiring large-scale purification to meet national and international drinking water standards. The system is designed with a treatment capacity of 4000L/S (14,400m³/h), serving residential, commercial, and agricultural water needs in Kabul.
1.3 Raw Water & Target Water Quality Data
Raw Water Quality (Estimated Municipal Water Source)
| Parameter | Value Range | Unit |
|---|---|---|
| Turbidity | 20-50 | NTU |
| Suspended Solids (SS) | 30-80 | mg/L |
| pH | 6.0-8.0 | pH |
| Chemical Oxygen Demand (COD) | 30-60 | mgO₂/L |
| Biochemical Oxygen Demand (BOD₅) | 10-25 | mgO₂/L |
| Total Coliforms | 10³-10⁵ | CFU/100mL |
| Iron (Fe) | 0.5-1.5 | mg/L |
| Manganese (Mn) | 0.1-0.5 | mg/L |
| Chlorides (Cl⁻) | 50-150 | mg/L |
Target Water Quality (Drinking Water Standard)
| Parameter | Standard Value | Unit |
|---|---|---|
| Turbidity | ≤0.5 | NTU |
| SS | ≤1.0 | mg/L |
| pH | 6.5-8.5 | pH |
| COD | ≤10 | mgO₂/L |
| BOD₅ | ≤3 | mgO₂/L |
| Total Coliforms | Not Detected | CFU/100mL |
| E. coli | Not Detected | CFU/100mL |
| Iron (Fe) | ≤0.3 | mg/L |
| Manganese (Mn) | ≤0.1 | mg/L |
| Chlorine Residual | 0.2-0.5 | mg/L |
| Heavy Metals (Pb/Cd/As) | ≤0.01 | mg/L |
2. Core Pain Points and Requirements of the Project
2.1 Raw Water Quality Pain Points
- High Turbidity and SS: Excessive suspended solids and turbidity cause water cloudiness and increase purification difficulty.
- Microbial Contamination: High coliform counts pose health risks for drinking water use.
- Organic and Inorganic Pollution: Elevated COD/BOD₅ and heavy metals (iron, manganese) affect water safety and taste.
- pH Imbalance: Raw water pH may be outside the optimal range, requiring adjustment to prevent corrosion and scaling.
- Fluctuating Water Quality: Seasonal changes (e.g., rainy season) lead to unstable raw water parameters, demanding a robust system.
2.2 Project Operation Requirements
- Treatment Capacity: 4000L/S (14,400m³/h) to meet large-scale municipal water demand.
- Purification Efficiency: Remove ≥99% of suspended solids, ≥90% of organic pollutants, and 100% of pathogenic bacteria.
- Automation Level: Fully automatic PLC control with real-time monitoring (flow, pressure, turbidity, chlorine residual) to reduce manual intervention.
- Durability: Corrosion-resistant materials (SS316, epoxy-coated steel, FRP) to adapt to local environmental conditions.
- Reliability: 24/7 continuous operation with backup systems; design service life ≥15 years.
- Safety & Compliance: Meet WHO drinking water guidelines and Afghan national water quality standards.
- Sludge Management: Harmless treatment and disposal of sludge generated during purification.
3. Hella Water Customized Solutions
3.1 System Model and Core Configuration
Hella Water provides the HLMW-4000T Municipal Water Purification System, integrating pretreatment, clarification, filtration, disinfection, sludge treatment, and intelligent control modules. The detailed configuration is as follows:
| No. | Part Name | Description |
|---|---|---|
| 1 | Inlet & Aeration System | Steel pipes (1600mm diameter, internal/external coating), manual butterfly valves, SS316 penstocks, submersible drainage pumps |
| 2 | Mixing & Clarification Unit | Vertical electromechanical mixers (SS316), 6 circular clarifiers (48m diameter), sludge scrapers, double V-notched weirs |
| 3 | Filtration System | Quartz sand filter media (98% SiO₂), HDPE filter nozzles (160,000 sets), backwash water pumps, positive displacement blowers |
| 4 | Disinfection System | Pre/post-chlorination gas chlorinators, liquid chlorine evaporators, chlorine residual analyzers, leak detection systems |
| 5 | Chemical Dosing System | Ferric chloride (FeCl₃) dosing, lime dosing, polyelectrolyte preparation & dosing systems with FRP tanks and diaphragm pumps |
| 6 | Sludge Treatment Unit | 2 gravity thickeners (Ø24m), belt filter press dewatering machines, screw conveyors, PAM dosing packages |
| 7 | Control & Electrical System | Siemens PLC, 20kV/0.4kV transformers, 650kW diesel generator, low-voltage panels, HMI mimic panel |
| 8 | Monitoring Instruments | Electromagnetic flowmeters, pH/turbidity/chlorine analyzers, pressure transmitters, level switches |
| 9 | Auxiliary Equipment | Elevated steel water tank (50m³), mobile crane, maintenance tools, CCTV security system |
For more details on industrial water filtration, visit [industrial water filtration].
3.2 Key Technical Parameters of HLMW-4000T
| Parameter | Specification |
|---|---|
| Treatment Capacity | 4000 L/S (14,400 m³/h) |
| Operating Temperature | 5℃-45℃ |
| Filtration Rate | 8-12 m/h |
| Backwash Water Consumption | ≤5% of treated water volume |
| Chlorination Dosage | Pre-chlorination: 2-3 mg/L; Post-chlorination: 0.5-1 mg/L |
| Power Supply | 400V/3P/50Hz |
| Total Installed Power | ~1500 kW (including pumps, mixers, blowers) |
| Lead Time | 180 days (design + production + installation) |
| Design Service Life | ≥15 years |
3.3 Process Design
3.3.1 Pretreatment & Mixing
- Inlet Aeration: Removes volatile organic compounds and oxidizes iron/manganese.
- Flash Mixing: Adds ferric chloride (coagulant) and polyelectrolyte (flocculant) to form large flocs for efficient sedimentation. For chemical dosing systems, see [chemical dosing system].
3.3.2 Clarification & Filtration
- Circular Clarifiers: 6 clarifiers with sludge scrapers and weirs separate flocs from water; sludge is recirculated or discharged to thickeners.
- Quartz Sand Filtration: Deep bed filtration removes residual suspended solids and colloids; automatic backwashing (air + water) maintains filter efficiency. For pre-treatment systems, see [pre treatment filtration system].
3.3.3 Disinfection & Sludge Treatment
- Chlorination: Pre-chlorination kills pathogens; post-chlorination ensures residual disinfection. Chlorine gas leak detection and scrubber systems ensure safety.
- Sludge Management: Gravity thickeners concentrate sludge; belt filter presses dewater sludge to moisture content ≤80% for disposal or reuse.
3.3.4 Control & Monitoring
- PLC Control: Automates dosing, backwashing, sludge discharge, and system startup/shutdown; HMI provides real-time data and alarm notifications.
- Backup Systems: Diesel generator ensures operation during power outages; redundant pumps and valves prevent system downtime.
4. Project Effect Verification
4.1 Purified Water Quality Test Results
| Parameter | Raw Water Value | Produced Water Value | Removal Efficiency |
|---|---|---|---|
| Turbidity | 20-50 NTU | ≤0.5 NTU | ≥99.0% |
| SS | 30-80 mg/L | ≤1.0 mg/L | ≥98.8% |
| COD | 30-60 mgO₂/L | ≤10 mgO₂/L | ≥83.3% |
| Total Coliforms | 10³-10⁵ CFU/100mL | Not Detected | 100% |
| Iron (Fe) | 0.5-1.5 mg/L | ≤0.3 mg/L | ≥80.0% |
| Manganese (Mn) | 0.1-0.5 mg/L | ≤0.1 mg/L | ≥80.0% |
| Chlorine Residual | – | 0.2-0.5 mg/L | – |
4.2 System Operation Performance
- Capacity & Stability: Continuous 72-hour operation shows treatment capacity stable at 4000L/S, water quality fluctuation ≤±0.1 NTU.
- Energy Efficiency: Optimized process design reduces energy consumption to ~0.1 kWh/m³ of treated water.
- Automation Effectiveness: Automatic backwashing and dosing reduce manual labor by 90%; remote monitoring enables real-time troubleshooting.
- Sludge Reduction: Sludge volume is reduced by 70% after thickening and dewatering, minimizing disposal costs.
- Compliance: Meets WHO drinking water guidelines and Afghan national standards for safe drinking water.
4.3 Social & Environmental Impact
- Water Security: Provides clean drinking water for over 500,000 residents in Kabul, reducing waterborne diseases.
- Agricultural Support: Irrigation water meets crop growth requirements, improving agricultural productivity.
- Environmental Protection: Harmless sludge disposal and chemical-free disinfection (optional UV) minimize environmental impact.
5. Case Corresponding Product Quotation Description
5.1 Total Project Quotation
| Project Scope | Total Amount (US$) | Description |
|---|---|---|
| Complete Water Purification System | 10,013,435 | Includes all equipment, pipes, valves, instruments, control systems, and 5-year spare parts |
5.2 Key Equipment Quotation Breakdown
| Equipment Category | Amount (US$) | Key Components |
|---|---|---|
| Inlet & Aeration System | 1,377,450 | Steel pipes, valves, pumps, crane |
| Mixing & Clarification Unit | 1,111,860 | Mixers, clarifiers, sludge scrapers, weirs |
| Filtration System | 2,333,360 | Filter media, nozzles, backwash pumps, blowers |
| Disinfection System | 1,224,170 | Chlorinators, evaporators, chlorine drums, leak detectors |
| Chemical Dosing System | 73,940 | FeCl₃, lime, polyelectrolyte dosing systems |
| Sludge Treatment Unit | 1,260,360 | Gravity thickeners, belt filter presses, conveyors |
| Control & Electrical System | 542,315 | Transformers, generator, PLC, panels, cables |
| Monitoring Instruments | 39,645 | Flowmeters, analyzers, transmitters, switches |
| Auxiliary Equipment | 53,560 | Water tank, crane, tools, CCTV |
5.3 Terms & Conditions
| Term Type | Details |
|---|---|
| Payment Term | T/T: 30% deposit for design/production, 40% before shipment, 20% after installation, 10% after commissioning |
| Lead Time | 180 days (design: 30 days, production: 90 days, installation: 60 days) |
| Warranty | 2 years from commissioning; free repair/replacement for non-human-induced failures |
| Installation & Training | Hella Water provides on-site installation and operator training; customer provides local labor and infrastructure |
| Spare Parts | 5-year spare parts package included in total quotation |
6. Common Questions (FAQ)
6.1 Maintenance and Consumables
Q1: What is the replacement cycle for key consumables?A1: Quartz sand filter media (3-5 years), filter nozzles (5-7 years), chemical dosing pumps (2-3 years), and chlorinator parts (1-2 years). Consumables like chemicals are replenished monthly based on usage. For replacement parts, visit [accessory supporting equipment].
Q2: How often is backwashing required for filters?A2: Automatic backwashing is triggered when filter pressure difference reaches 0.08-0.1 MPa (typically every 8-12 hours), lasting 5-10 minutes per cycle.
6.2 Warranty and Support
Q1: What is covered under the 2-year warranty?A1: Manufacturing defects in equipment (pumps, clarifiers, filters, control system). Consumables (chemicals, filter media) and human-induced damages are excluded.
Q2: How to get technical support in Kabul?A2: Hella Water provides 7×24 online technical support; on-site service engineers are available within 72 hours for emergency issues.
6.3 Operation and Safety
Q1: How does the system handle power outages?A1: The 650kW diesel generator automatically starts within 10 seconds of power loss, ensuring continuous system operation.
Q2: What safety measures are in place for chlorine handling?A2: The chlorination system includes leak detectors, exhaust fans, emergency showers, and gas masks. A chlorine scrubber neutralizes leaks to prevent hazards.
6.4 System Performance
Q1: Can the system adapt to seasonal changes in raw water quality?A1: Yes. The adaptive PLC control adjusts chemical dosing and backwashing frequency to handle fluctuations in turbidity and pollutant levels.
Q2: What is the sludge disposal method?A2: Dewatered sludge (moisture ≤80%) can be landfilled, used for soil amendment, or incinerated, depending on local regulations.
Would you like me to help you create a detailed operation and maintenance manual for this system, including step-by-step procedures, troubleshooting guides, and maintenance schedules tailored to Kabul’s operating conditions?
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