Wastewater Screen Selection Using Solids Loading Analysis
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Solution Overview
Problem
Current wastewater treatment systems often oversize screening equipment due to generalized calculations based on peak flow and opening size, failing to account for unique solids loading characteristics, leading to inefficient screening and increased capital costs.
Innovation Solution
A system and method for analyzing solids loading characteristics of individual wastewater treatment plants to determine the appropriate screen type, size, and operational sequence, using specialized equipment to evaluate waste stream data and optimize screen openings and capture ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If generalized calculations based on peak flow and opening size are used to size screening equipment, then capital costs are reduced through standardization, but screening efficiency deteriorates due to mismatch with actual solids loading characteristics
Solution Approach 1:
The patent applies parameter changes by transitioning from generalized sizing parameters (peak flow, opening size) to site-specific parameters (solids loading characteristics, particle size distribution, flow variability). This involves measuring actual waste stream parameters at the facility and using those measurements to customize screen opening size, screen type, and operational parameters, thereby resolving the contradiction between standardization and efficiency
Solution Approach 2:
The patent implements preliminary action by conducting waste stream evaluation and solids loading analysis before screen selection and installation. This preliminary characterization of the waste stream allows for optimized screen sizing and configuration that matches actual conditions, preventing inefficiencies that would arise from generic sizing approaches
2Reliability
If conservative sizing is used for screen equipment, then reliability is improved through adequate capacity, but capital outlay increases due to oversized equipment
Solution Approach 1:
The patent changes the sizing parameters from conservative generic factors to site-specific measured parameters including flow variability, solids concentration, and particle size distribution. This allows determination of the actual minimum screen capacity needed, eliminating capital waste from oversized equipment while ensuring adequate reliability through proper sizing
Solution Approach 2:
The patent replaces mechanical judgment and conservative estimation with a measurement-based system that uses actual waste stream data. This substitution of empirical measurement for engineering judgment enables precise sizing that balances reliability requirements with capital cost optimization
3Reliability
If finer upstream screening protection is implemented, then downstream process protection is improved, but organic and fecal material removal increases unnecessarily
Solution Approach 1:
The patent changes the screen opening size parameter from generic fine screening specifications to site-specific optimized values based on actual particle size distribution measurements. This ensures that screens are fine enough to protect downstream processes but not so fine as to unnecessarily remove organic and fecal material that should remain for treatment
Solution Approach 2:
The patent applies local quality by tailoring the screening parameters (opening size, screen type) to the specific local conditions of each facility's waste stream characteristics. This localized optimization ensures appropriate protection level for each downstream process without excessive material removal
4Measurement precision
If unique waste stream analysis is conducted for each plant, then screen selection accuracy is improved, but system complexity increases due to customized evaluation requirements
Solution Approach 1:
The patent implements preliminary action by establishing a standardized waste stream evaluation protocol that is applied uniformly across different facilities. This preliminary characterization framework provides consistent measurement and analysis procedures, reducing the complexity of customization while maintaining high selection accuracy through site-specific data collection
Data Source
AI summary
A system and method for evaluating a flow pattern and downstream process for proper selection of screen type, opening and size for optimal screenings capture, operation time and capital outlay. The end result is a properly designed system that effectively protects downstream equipment and may save the customer money throughout the entire plant.