Here is the professional English translation of the Automated Cleaning Process Design for Nanofiltration (NF) Membranes:

I. Automated Cleaning System Framework

graph LR
    A[Fouling Monitoring] --> B[AI Fouling Type Identification]
    B --> C{Decision Module}
    C -->|Organic Fouling| D[Alkaline Protease Cleaning]
    C -->|Inorganic Scaling| E[Citric Acid Cleaning]
    C -->|Biofouling| F[NaClO + NaOH Cleaning]
    D & E & F --> G[Automatic Execution Unit]
    G --> H[Rinsing & Validation]
    H -->|Pass| I[Resume Operation]
    H -->|Fail| C

II. Core Automation Components

1. Smart Monitoring System

2. Chemical Dosing Unit (Modular Design)

|   Tank   |   Chemical Formula              |   Concentration Control  | Heating |
|----------|---------------------------------|--------------------------|---------|
| CIP1     | 0.1% NaOH + 0.05% SDS           | Closed-loop PID          | 40°C   |
| CIP2     | 0.3% Citric Acid + 0.1% EDTA-2Na| Conductivity Feedback    | -       |
| CIP3     | 200ppm NaClO (pH=10.5 adjusted) | ORP Monitoring           | Ambient |
| CIP4     | RO Water Rinse (≥50m³/h)       | Turbidity Control        | -       |

III. Automated Cleaning Procedure (PLC+HMI Control)

Step 1 - Fouling Diagnosis

# Pressure & Flow Joint Algorithm
if (ΔP > 1.5*ΔP0) and (Flow < 0.85*Flow0): 
    activate_cleaning("Emergency Mode")
elif (Runtime > 168h): 
    activate_cleaning("Scheduled Cleaning")

Step 2 - Cleaning Sequence

Step 3 - Performance Validation

Recovery Rate = (Post-cleaning ΔP / Initial ΔP) × 100%
if Recovery Rate ≥ 95%:
    Switch to production mode
else:
    Activate AI diagnosis + Secondary cleaning

IV. Key Technical Parameters

V. Safety Systems

1. Interlocks
   • Isolate permeate line during cleaning (chemical contamination prevention)
   • Pause program when chemical tank level <10%
2. Emergency Response

   graph TB
       Over-Temp(>55°C) --> Cold_RO_Water_Injection
       Pressure_Surge(>1.8×DP) --> Emergency_Relief_Valve
       pH_Excursion(pH<3 or >12) --> Neutralization_Tank

3. Data Traceability
   • Automated cleaning reports (ΔP/flow/conductivity trends)
   • Fault code library (100+ failure scenario solutions)

VI. Operational Benefits

Case Data: Whey Protein NF Concentration System

| Fouling Type   | Pre-clean Flux(LMH) | Post-clean Flux(LMH) | Recovery |
|----------------|---------------------|----------------------|----------|
| Protein Adsorption | 18.2            | 35.5                 | 97.8%    |
| Ca Scaling         | 15.7            | 32.1                 | 96.4%    |
| Biofilm            | 12.3            | 33.8                 | 98.2%    |