Detailed introduction
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As an excellent adsorbent material, activated carbon has strong adsorption capacity for dissolved organic pollutants in water, such as benzene compounds, phenol compounds, cyanide compounds, petroleum and petroleum derivatives, due to its unique adsorption surface structure characteristics and surface chemical properties. Moreover, it has good removal effects on organic pollutants that are difficult to eliminate by biological methods and other chemical methods, such as chroma, abnormal odor, methylene blue-like substances, herbicides, insecticides, pesticides, synthetic detergents, synthetic dyes, amine compounds and many artificially synthesized organic compounds.
Activated carbon wastewater treatment processes are primarily applied in two areas:
1) Front-end wastewater treatment:
Activated carbon adsorbs macromolecular organic compounds in wastewater, improving the B/C ratio and enhancing biochemical activity, thereby reducing the treatment burden on biological systems. It also minimizes excessive sludge generation. Activated carbon exhibits strong selective adsorption for non-biodegradable antibiotics and toxic compounds in wastewater, ensuring the treated effluent meets requirements for subsequent biological treatment.
2) End-stage wastewater treatment:
★ Upgrading treatment standards
Traditional processes—biological, oxidation, or combined oxidation-biological methods—often fail to achieve required treatment depths and exhibit poor shock resistance. Activated carbon adsorption enables treated effluent to perfectly meet Class IV surface water standards or higher (COD ≤ 30 ppm) with strong resistance to fluctuations.
★ Zero Liquid Discharge
Wastewater pre-treated with activated carbon adsorption before membrane units reduces COD and color, extending membrane service life. Post-membrane concentrate undergoes secondary activated carbon adsorption to remove residual COD, reducing impurity salts and improving salt quality.
Characteristics of Multi-Stage Furnace Activated Carbon Regeneration Process
1) Low regeneration costs;
2) Minimal activated carbon loss during regeneration;
3) No significant decline in adsorption capacity after regeneration;
4) Minimal exhaust gas generation during regeneration with low secondary pollution.
Activated Carbon Wastewater Treatment Process:
Technical Features
Through automatic control of parameters such as adsorption time, flow rate, distribution, turbulence, carbon bed level, and liquid level, wastewater flows through a pulsed fluidized bed adsorption tower with a specific structure;
Enables precise control of effluent quality to meet set requirements // Ensures stable effluent quality, meeting discharge standards with COD ≤ 30 mg/L;
The feed solution flows upward through the activated carbon bed.
A stable concentration gradient forms from bottom to top within the bed.
The dirtiest activated carbon is selectively discharged locally.
Activated carbon consumption is minimized, maintaining the bed in a “fresh carbon” state for high adsorption efficiency.
Compact footprint with reduced capital investment // Compact layout and fluidized adsorption bed minimize initial costs;
Simple operation with low running expenses // Unattended operation possible, only regenerating saturated carbon, resulting in relatively low cost per ton of treated water;
High removal efficiency for dissolved and refractory organic compounds in wastewater, making it an ideal choice for advanced treatment of biological effluent.
Process Operation Advantages
Hydraulically Intensive Activated Carbon Conveying System
Low activated carbon wear and consumption, ensuring regeneration loss rate controlled at 4–8%;
High activated carbon conveying efficiency (high solid-liquid ratio);
Low risk of mechanical failure.
Energy Savings
Low fuel consumption;
Waste heat recovery and proprietary pre-drying technology enhance energy efficiency and production;
CTMHF activated carbon regeneration fuel consumption: 120–150 Nm³ (LNG)/t carbon;
Afterburner fuel consumption: 150 Nm³ (LNG)/t carbon at 850°C.
Activated Carbon Regeneration Instructions
① Drying
100°C to 250°C. Evaporates moisture within the activated carbon.
② Pyrolysis
250°C–700°C. Volatile components within organic matter adsorbed in the activated carbon's pores are evaporated and carbonized.
③ Activation
700°C–900°C. Steam is injected to remove carbonized residues from the pores formed during pyrolysis, restoring the activated carbon's porosity.
Wastewater Treatment Technology
Keywords: Wastewater Treatment Technology
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Nanjing Yuding Environmental Technology Co., Ltd. is a wholly-owned subsidiary of Jiangsu Huanan Petrochemical Engineering Group Co., Ltd., dedicated to the research, development, design, manufacturing, installation, and operation of environmental protection technologies and equipment.
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