As an adsorbent material with excellent performance, activated carbon boasts unique adsorption surface structural characteristics and surface chemical properties, enabling it to exhibit strong adsorption capacity for dissolved organic pollutants in water, such as benzene compounds, phenol compounds, cyanide compounds, petroleum and petroleum derivatives. Moreover, it demonstrates remarkable removal efficiency even for organic pollutants that are difficult to eliminate by biological or other chemical methods—such as color, unpleasant odors, methylene blue-like substances, herbicides, insecticides, pesticides, synthetic detergents, synthetic dyes, amine compounds, and numerous artificially synthesized organic compounds.

　　The activated carbon wastewater treatment process is primarily applied in two areas:

　　1) Wastewater treatment front end:

　　Activated carbon adsorbs large-molecule organic substances from wastewater, thereby increasing the B/C ratio of the wastewater and enhancing its biochemical activity, which in turn reduces the processing load on the biochemical system. At the same time, it significantly decreases the generation of excess sludge. Activated carbon exhibits strong selective adsorption for non-biodegradable antibiotics and toxic compounds present in wastewater; after being treated with activated carbon, the wastewater meets the requirements for subsequent biochemical treatment.

　　2) Wastewater treatment downstream:

　　★ Wastewater Upgrade and Transformation

　　Traditional wastewater treatment processes—such as biochemical methods, oxidation methods, and oxidation-plus-biochemical methods—all suffer from insufficient treatment depth and poor shock resistance. Activated carbon adsorption, however, enables treated wastewater to meet or exceed the Class IV surface water standard for COD, with a COD level of ≤30 ppm, and demonstrates strong resistance to fluctuations.

　 　★Zero wastewater discharge

　　The wastewater, before entering the membrane assembly, undergoes activated carbon adsorption to reduce its COD and colority, thereby extending the service life of the membrane assembly.

　　The COD in the concentrated brine after membrane treatment is further adsorbed and removed by activated carbon, reducing the amount of impurity salts and improving the quality of the salt.

　　Process Operation Advantages

　　Activated Carbon Hydraulic Intensive Transportation System

　　Activated carbon exhibits low wear and consumption, ensuring that the attrition rate during regeneration is controlled within 4% to 8%.

　　Activated carbon has high conveying efficiency (high solid-liquid ratio);

　　The risk of mechanical failure is low.

　　Activated Carbon Wastewater Treatment Process:

　　Technical Features

　　By automatically controlling parameters such as adsorption time, flow rate, distribution, turbulence, carbon bed level, and liquid level, the wastewater flows through a pulsating fluidized-bed adsorption tower with a specific structure.

　　The effluent quality can be precisely controlled to meet the set requirements; the water quality of the effluent is stable and can satisfy the discharge standard of COD ≤ 30 mg/L.

　　The feed liquid to be processed flows upward through the activated carbon bed, where a stable concentration gradient is established from bottom to top.

　　The dirtiest activated carbon is locally discharged, allowing the amount of activated carbon used to be minimized. The bed remains consistently in a “new-carbon” operating condition, ensuring high adsorption efficiency.

　　Small footprint and lower equipment investment // Compact layout, fluidized bed adsorption—low initial investment;

　　Simple operation and low operating costs // Can be operated unattended, requiring only regeneration of “saturated carbon,” resulting in relatively low treatment costs per ton of water.

　　It boasts high removal efficiency for dissolved, hardly degradable organic pollutants in wastewater, making it an ideal choice for advanced treatment processes of biochemical effluent.

　　Process Operation Advantages

　　■ Low regeneration cost;

　　■ Little loss of activated carbon during the regeneration process;

　　■ The adsorption capacity of activated carbon does not significantly decrease after regeneration;

　　■ The tail gas generated during the regeneration process is minimal, and secondary pollution is low.

　　Save energy

　　■ Low fuel consumption;

　　■ Waste heat recovery and a unique pre-drying technology for energy savings and increased production;

　　■ CTMHF activated carbon regeneration fuel consumption: 120–150 Nm³ (LNG)/ton of carbon;

　　■ Post-combustion chamber fuel consumption: 150 Nm³ (LNG)/ton of coal, 850℃.

　　Activated Carbon Regeneration Instructions

　　① Drying

　　100 ℃~250℃. The moisture inside the activated carbon evaporates and dries out.

　　② Pyrolysis

　　250 ℃ to 700℃. The volatile components in the organic substances adsorbed within the micropores of activated carbon are evaporated and carbonized.

　　③ Activation

　　700 ℃ to 900℃. Steam is introduced to remove the carbonized substances from the micropores of the activated carbon during pyrolysis, thereby restoring the activated carbon's activity.

　　Activation reaction formula:

　　C + O ₂ →CO ₂ ↑

　　C + H ₂ O → CO↑ + H ₂ ↑

　　C + CO ₂ → 2CO↑