Sewage Treatment Plant

I. User Pain Points

Wastewater treatment plants—encompassing municipal sewage, industrial wastewater, and integrated treatment facilities—face three core challenges across their influent pretreatment, biological effluent purification, and sludge treatment stages: "residual refractory organic matter," "excessive total nitrogen/total phosphorus levels," and "difficulties in sludge dewatering." These issues directly jeopardize effluent compliance, operational costs, and sludge disposal processes:

• Residual Refractory Organic Matter: Effluent COD Exceeds Limits

The influx of industrial wastewater introduces refractory organic compounds (such as polycyclic aromatic hydrocarbons, dye intermediates, and pesticides) into the influent. Traditional A²O processes are capable of removing only 30% of this refractory COD, resulting in effluent COD levels that exceed the Class 1-A standards stipulated in the *Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants*. For instance, a municipal wastewater treatment plant—a client of Shanxi Xinhuasheng Carbon—was fined 800,000 RMB by environmental authorities and ordered to implement corrective measures within a specified timeframe after its effluent COD levels exceeded limits due to the acceptance of dyeing and printing wastewater.

• Excessive Total Nitrogen/Total Phosphorus: Risk of Water Body Eutrophication

Influent characterized by a low carbon-to-nitrogen ratio leads to low removal rates for total nitrogen and total phosphorus. Traditional biological denitrification and phosphorus removal processes achieve a total nitrogen removal rate of less than 60%, resulting in effluent total nitrogen levels that exceed regulatory limits. A wastewater treatment plant located within a lake basin—another client of Shanxi Xinhuasheng Carbon—incurred ecological compensation liabilities exceeding 1 million RMB after excessive total nitrogen levels in its effluent triggered an algal bloom in the receiving water body.

• Difficult Sludge Dewatering: Soaring Disposal Costs

Surplus sludge contains significant quantities of bound water and extracellular polymeric substances (EPS). Traditional processes—combining flocculation with mechanical pressing—can reduce moisture content to only 80%, resulting in prohibitively high sludge disposal costs. A wastewater treatment plant within an industrial park—a client of Shanxi Xinhuasheng Carbon—faces annual sludge disposal costs exceeding 5 million RMB; furthermore, its sludge is frequently rejected by landfills due to its excessively high moisture content. II. Application Objectives
The four core objectives for employing activated carbon in wastewater treatment plants revolve around the following key areas: "deep removal of refractory COD, enhanced removal of total nitrogen and total phosphorus, efficient sludge dewatering, and cost reduction with efficiency gains in operations."

• Deep Removal of Refractory COD: Ensuring Effluent Compliance

By utilizing mesoporous activated carbon to adsorb refractory substances—such as polycyclic aromatic hydrocarbons (PAHs) and dye intermediates—and combining this with surface modification to enhance adsorption capacity, the effluent COD levels consistently surpass China's Grade I-A National Standard. Consequently, the risk of incurring fines due to non-compliance is completely eliminated.

• Enhanced Removal of Total Nitrogen and Total Phosphorus: Preventing Water Body Eutrophication

By employing iron-lanthanum modified activated carbon to simultaneously adsorb nitrate nitrogen and phosphates—forming stable precipitates in the process—effluent levels of total nitrogen and total phosphorus are significantly superior to national standards. This effectively and completely eliminates the risk of water body eutrophication.

• Efficient Sludge Dewatering: Reducing Disposal Costs

By utilizing powdered activated carbon as a sludge conditioner to disrupt the colloidal structure of the sludge and release bound water, the sludge moisture content is reduced to below 60%. This results in a significant reduction in sludge disposal costs.

• Strict Compliance: Meeting Global Wastewater Discharge Standards

The technology meets the requirements of numerous domestic and international wastewater treatment standards, including China's Grade I-A Standard, the EU Urban Wastewater Treatment Directive, and relevant standards set by the U.S. EPA.

III. Significance of Application

The application of activated carbon in wastewater treatment plants serves as a core pillar supporting three critical aspects: "ensuring a baseline of effluent compliance," "controlling operational costs," and "preventing environmental risks."

• Effluent Compliance Baseline: Avoids fines and financial losses associated with corrective actions caused by excessive levels of COD, total nitrogen, or other pollutants.
• Operational Cost Control: Achieves a substantial reduction in sludge moisture content, leading to significantly lower sludge disposal costs.
• Environmental Risk Prevention: Ensures stable compliance regarding total phosphorus levels, thereby completely eliminating the risks of water body eutrophication and potential ecological compensation liabilities.

IV. History of Application

The application of activated carbon in the field of wastewater treatment has progressively deepened in response to increasingly stringent discharge standards:
1.  1970s: The United States pioneered the use of granular activated carbon for the advanced treatment of secondary effluent.
2. 2000s: The implementation of China's Grade I-A National Standard drove the widespread adoption of activated carbon-based advanced treatment processes.

3.  2020s: The growing demands for carbon neutrality and sludge volume reduction have driven the technological upgrading of powdered activated carbon conditioning techniques. V. Mechanism of

Action

1. Mesoporous Adsorption of Refractory COD: Efficiently adsorbs macromolecular organic substances through pore-size matching and hydrogen bonding interactions.
2. Modified Adsorption of Nitrogen and Phosphorus: Iron and lanthanum ions form insoluble precipitates with phosphates, while simultaneously electrostatically adsorbing nitrate nitrogen.
3. Powdered Activated Carbon Sludge Conditioning: Adsorbs extracellular polymeric substances (EPS) and disrupts floc structures, thereby enhancing dewatering efficiency.

VI. Application Methods

1. Removal of Refractory COD: Mesoporous Activated Carbon Adsorption Tank Process
Designed for the advanced treatment of secondary effluent, utilizing mesoporous activated carbon adsorption towers to ensure stable compliance with COD discharge standards.
2. Advanced Removal of Total Nitrogen and Total Phosphorus: Modified Activated Carbon Filtration Process
Utilizes filtration tanks packed with iron- and lanthanum-modified activated carbon to simultaneously achieve advanced removal of both total nitrogen and total phosphorus.
3. Sludge Dewatering: Powdered Activated Carbon Conditioning System
Involves the addition of powdered activated carbon to disrupt the sludge structure; when combined with pressure filtration, this reduces the moisture content to below 60%.

VII. Application Process

Case Study: A Municipal Wastewater Treatment Plant with a Daily Capacity of 100,000 Tons
• Mesoporous Activated Carbon Adsorption Tank: Effluent COD reduced to 38 mg/L.
• Modified Activated Carbon Filtration Tank: Total Nitrogen reduced to 11.5 mg/L; Total Phosphorus reduced to 0.25 mg/L.
• Powdered Activated Carbon Sludge Conditioning: Sludge moisture content reduced to 57%.
Achieved Results: Full compliance of effluent with discharge standards; elimination of environmental fines; significant reduction in sludge disposal costs.

VIII. Application Performance

Parameters	Parameters	After Renovation	Magnitude of Change	Compliance Status
Effluent COD (mg/L)	65	38	Reduced by 41.5%	National Standard Grade I-A
Effluent TN (mg/L)	18	11.5	Reduced by 36.1%	National Standard Grade I-A
Sludge Moisture Content (%)	82	57	Reduced by 30.5%	Meets Disposal Requirements
Annual Fines (10,000 CNY)	80	0	Reduced by 100%	—
Annual Sludge Disposal Costs (10,000 CNY)	1500	600	Reduced by 60%	—

IX. Core Advantages

• Highly Targeted Products: Mesoporous carbon for COD removal, modified carbon for nitrogen and phosphorus removal, and powdered carbon for sludge conditioning;
• A Win-Win for Compliance and Cost Savings: Ensures stable compliance while significantly reducing sludge disposal costs;
• Compliant and Reliable: Certified by authoritative domestic and international bodies, and currently deployed by numerous major water utility groups.

X. Cost Analysis 

 

Project	Activated Carbon Process	Traditional Craftsmanship
Initial Investment (10,000 CNY)	1500-2000	1000-1500
Annual Operating Costs (10,000 CNY)	500	800
Annual Penalty Losses (10,000 CNY)	0	80
Annual Sludge Disposal Fees (10,000 CNY)	600	1500
Annual Comprehensive Costs (10,000 CNY)	1100	2380
Annual Savings (10,000 CNY)	1280	—

XI. Why Choose Us?

Our advanced treatment solutions are mature and reliable. Technical Expertise: We conduct targeted R&D to develop specialized activated carbon products designed to address three major industry pain points: COD, nitrogen and phosphorus removal, and sludge management. Global Service: With three production bases and an annual capacity of 45,000 tons, we offer customized solutions and rapid delivery services.