During the operation of activated carbon filters, it is essential to focus on four core aspects: water quality adaptation, operational parameter control, equipment maintenance, and safety compliance to avoid issues such as filter media failure, equipment damage, and non-compliant water quality. Specific precautions are as follows:
I. Water Quality Adaptation and Pre-treatment: Reducing Equipment Load at the Source
Clarify the water quality adaptation range: Select the appropriate activated carbon based on the treatment goal (e.g., choose coconut shell carbon for chlorine removal, or coal-based cylindrical carbon for high-concentration organic removal) to avoid low adsorption efficiency due to improper material selection. Additionally, avoid treating water with high concentrations of strong acids, strong alkalis, or large amounts of oxidizing agents (e.g., untreated high-chlorine water) to prevent rapid oxidation and failure of the activated carbon or corrosion of the tank.
Strengthen pre-treatment: Must install a quartz sand filter and a 5μm precision filter before the activated carbon filter to control the inlet water turbidity below 1 NTU, removing suspended solids, sediment, and other impurities to prevent clogging of the activated carbon pores. If the inlet water exceeds the standard for iron and manganese (iron > 0.1 mg/L, manganese > 0.05 mg/L) or contains oil, additional specialized pre-treatment equipment must be installed to prevent filter media agglomeration and encapsulation failure.
II. Operational Parameter Control: Ensuring Stable Filtration Effect
Stabilize filter flow rate and pressure: The filter flow rate should be controlled between 8-12 m/h to ensure contact time between water and activated carbon is ≥10 minutes, avoiding fast flow rates that lead to contaminant breakthrough. Maintain working pressure between 0.1-0.6 MPa, strictly prohibiting overpressure operation to prevent structural fatigue damage to the tank.
Control inlet conditions: Adjust the inlet pH value to the optimal adsorption range of 6-8, and control the temperature between 15-35°C, avoiding a sharp drop in adsorption efficiency due to low temperatures (<10°C). If the inlet contaminant concentration suddenly increases, reduce the flow rate or activate the bypass to prevent rapid saturation of the activated carbon.
Timely backwash and regeneration: Immediately initiate backwashing (conventional water backwash or air-water combined backwash) when the inlet-oulet pressure difference rises to 0.08-0.1 MPa, or when outlet chlorine residual exceeds the standard or odors return. Control backwash intensity between 10-15 L/(m²・s) to avoid excessive intensity causing filter media loss or insufficient intensity failing to clean the filter layer.
III. Equipment Maintenance: Extending Service Life
Filter media maintenance: Regularly (monthly) check if the filter layer is flat and agglomerated, manually loosening any hardened areas. Evaluate the adsorption performance of the activated carbon every 1-2 years; if the pollution removal efficiency drops by 30% or more, replenish or replace the filter media. In high-pollution scenarios, perform 1 chemical regeneration (using acid or alkali agents for soaking) every 6-12 months, depending on the type of pollutants.
Component and tank protection: Clean the water distributor and collector quarterly, checking for damaged filter screens. Replace aging gaskets every 6 months and tighten flange bolts. Perform passivation treatment on stainless steel tanks regularly, and avoid direct sunlight and sharp impacts on fiberglass tanks. Conduct 1 water pressure test and structural inspection annually.
Long-term shutdown protection: Thoroughly backwash and drain if the shutdown exceeds 1 week, and immerse the activated carbon in clean water (or add a protective liquid) with a dust cover if the shutdown exceeds 1 month. Test run for 30 minutes before restarting, ensuring water quality meets standards before resuming operation.
IV. Safety and Compliance: Avoiding Risk Hazards
Operational safety: Must shut down and relieve pressure before maintenance, prohibiting opening the lid under pressure. Wear anti-slip gloves and protective goggles during operation, and additional acid-base resistant protective suits when handling chemical regeneration. Install warning signs around the equipment, and use safety belts for high-altitude operations.
Environmental compliance: Backwash drainage must be discharged into a wastewater treatment system and meet standards before release, strictly prohibiting direct discharge. Wastewater after chemical regeneration must be neutralized to avoid water pollution. In food, beverage, and drinking water scenarios, backwash water must meet hygiene standards.
Emergency response: Equip with eyewash stations, first-aid kits, and spill containment tools. Immediately shut down and seek medical attention if the tank leaks or personnel come into contact with wastewater or chemicals. If water quality changes suddenly, switch to the bypass to investigate the cause, avoiding the entry of non-compliant water into subsequent processes.
V. Water Quality Monitoring: Detecting Abnormalities in a Timely Manner
Record daily inlet and outlet water parameters such as chlorine residual, COD, turbidity, and odor in operation logs. If outlet turbidity increases, investigate filter media loss or pre-treatment failure. If chlorine residual remains continuously above the standard, confirm if the activated carbon is saturated or if filter layer breakthrough has occurred, taking measures such as regeneration or replacing the filter media promptly.
