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Enhancing the efficiency of coagulation method for sewage treatment by adding sludge
Peng Zhao1,2, Lin Li3, Xilei Song1
1Henan International Joint Laboratory of Watershed Ecological Security in the Water Source Area of the Middle Route of South-to-North Water Diversion Project, College of Water Resource and Modern Agriculture, Nanyang Normal University, Nanyang, China.
Adding sludge to high-performance sedimentation tanks (HPST) significantly speeds up coagulation settlement in wastewater treatment. Optimal conditions were determined using response surface methodology, achieving a turbidity of 1.19 NTU.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Chemical Engineering
Background:
- High-performance sedimentation tanks (HPST) enhance water treatment by accelerating flocculant settling.
- The efficiency of HPST is influenced by multiple operational parameters.
- Optimizing these parameters is crucial for maximizing treatment load and effectiveness.
Purpose of the Study:
- To investigate and determine the optimal operating conditions for HPST in domestic sewage treatment.
- To evaluate the impact of sludge addition on the coagulation and settlement process.
- To develop a predictive model for HPST performance using response surface methodology.
Main Methods:
- Single-factor experiments were conducted to identify the optimal ranges for key variables.
- Response surface methodology (RSM) was employed for precise optimization of significant factors.
- Experimental validation was performed to confirm the model's predictions.
Main Results:
- Sludge addition accelerates coagulation settlement but does not directly improve water quality.
- Sludge dosage, coagulant dosage, and wastewater pH significantly impact coagulation efficiency.
- Optimal conditions identified: 1.70 g/L PAC, 2.35 mg/L CPAM, pH 8.0, 10 mL/L sludge, 5 min stirring, 30 min settling.
- Achieved a final treated sewage turbidity of 1.19 NTU.
Conclusions:
- HPST is an effective technology for accelerating wastewater settlement when properly optimized.
- The developed RSM model provides guidance for achieving efficient domestic sewage treatment.
- Optimized parameters significantly reduce turbidity, demonstrating the practical applicability of HPST.
