pH-Guided Biosolids Dewatering with Targeted Chemical Dosing
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Solution Overview
Problem
Existing methods for sludge and biosolids conditioning and dewatering are inefficient, leading to high polymer usage and increased costs for disposal and transportation, with chemical and particulate constituents affecting treatability and reuse opportunities.
Innovation Solution
A method involving measuring specific parameters like pH, alkalinity, and ortho-phosphorus concentration to determine metal salt and magnesium compound dosages, optimizing the treatment process to reduce polymer consumption and enhance dewaterability, using data collection and modeling tools to adjust dosages based on real-time operational conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If conventional dewatering methods are used, then dewatering can be achieved, but polymer consumption increases and costs increase
Solution Approach 1:
The patent changes chemical parameters by adding metal salts (changing ionic composition) and adjusting pH levels to optimize dewatering conditions. This allows reduction of polymer dosage while maintaining dewatering performance by creating more favorable chemical conditions for water removal.
Solution Approach 2:
The patent introduces metal salts as intermediary substances that mediate between the sludge components and the dewatering process. These metal salts interact with organic matter and polymers to enhance dewatering efficiency, allowing reduced polymer usage while achieving the same or better dewatering results.
2Productivity
If metal salt dosage is increased, then dewatering performance improves, but chemical usage costs increase
Solution Approach 1:
The patent employs feedback control by measuring pH and other parameters during the dewatering process, then adjusting metal salt and polymer dosages accordingly. This ensures optimal dewatering performance is achieved with minimum chemical usage, avoiding both under-dosing and over-dosing scenarios.
Solution Approach 2:
The patent applies partial action by using reduced dosages of metals and polymers compared to conventional methods, relying on the synergistic effects and optimized process conditions to achieve adequate dewatering performance without excessive chemical application.
3Productivity
If pH is adjusted to optimize dewatering, then dewaterability improves, but additional chemical amendments are required
Solution Approach 1:
The patent merges multiple functions into a single integrated process where pH adjustment, metal salt addition, and polymer dosing are coordinated simultaneously. This combined approach optimizes the overall dewatering process efficiency, achieving better results with reduced total chemical consumption compared to sequential or separate treatments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces polymer and metal salt usage, improves dewaterability, and enhances the quality of biosolids for reuse, optimizing chemical use and reducing disposal costs through targeted amendments and real-time process adjustments.
Implementation Method 1
determining a magnesium compound dosage for amending the wastewater solids to achieve a desired condition within the wastewater solids. The desired condition may include one or more of increasing a pH of the wastewater solids, decreasing a pH of the wastewater solids, and maintaining a pH of the wastewater solids
Implementation Method 2
determining a metal salt dosage for amending the wastewater solids based upon, at least in part, an initial ortho-phosphorus concentration and a reduction capacity to reduce one or more of a calculated Omega-S value and a Struvite Precipitation Index value
Data Source
AI summary
In general, a method for treating biosolids may include measuring one or more of pH, alkalinity, magnesium concentration, ortho-phosphorus concentration, total phosphorus content, ammonia content, total nitrogen content, total solids content, total volatile solids, polymer consumption, and metal salt consumption associated with a treatment process for wastewater solids. A metal salt dosage for amending the wastewater solids may be determined based upon, at least in part, an initial ortho-phosphorus concentration and a reduction capacity of the metal salt. A magnesium compound dosage may be determined for one or more of increasing, decreasing, and maintaining a pH of the wastewater solids. The magnesium compound dosage may be based upon, at least in part, a calculated anticipated change in pH of the wastewater solids resulting from an addition of the metal salts. The method may also include amending the treatment process with the determined metal salt dosage and the determined magnesium compound dosage.