Real-Time Sulfide Control in Wastewater Lines
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Solution Overview
Problem
Current methods for controlling sulfide levels in wastewater lines are inaccurate and non-real-time, relying on indirect estimates and manual control, which fail to effectively manage odor issues caused by dissolved sulfides like hydrogen sulfide.
Innovation Solution
A system using a dissolved sulfide measurement device to collect data and adjust the feed rate of odor control chemicals, such as iron salts, in real-time based on actual sulfide levels, with a computing unit determining the required chemical addition rate and sending signals to control pumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If indirect estimates or manual grab samples are used to control sulfide levels, then the control system is simpler to implement, but the measurement precision and real-time control capability are insufficient
Solution Approach 1:
The patent implements a closed-loop feedback control system where a sulfide sensor continuously measures dissolved sulfide levels in the wastewater line, and this measurement is fed back to a control unit that automatically adjusts the chemical dosing pump. This real-time feedback mechanism resolves the contradiction by providing accurate measurement data that directly drives precise control actions, eliminating the need for complex manual sampling and analysis procedures.
Solution Approach 2:
The patent replaces manual mechanical sampling methods with an automated electronic sensing and control system. Instead of physically collecting water samples for laboratory analysis, the system uses electronic sulfide sensors to continuously measure sulfide levels and electronically controls the dosing pump through a control unit, substituting mechanical manual operations with automated electro-mechanical systems that provide both simplicity and precision.
2Productivity
If real-time dissolved sulfide measurement is implemented, then the control accuracy is improved, but the device complexity and cost increase
Solution Approach 1:
The patent implements a self-regulating control system where the sulfide sensor continuously monitors the wastewater stream and automatically triggers dosing operations when sulfide levels exceed thresholds. The control unit compares real-time measurements against predetermined thresholds and autonomously adjusts pump operation without requiring external intervention or complex decision-making processes, enabling the system to serve itself and achieve high productivity with manageable complexity.
Solution Approach 2:
The patent controls the sulfide level by changing the addition rate parameter of odor control chemicals based on real-time sulfide concentration measurements. The control unit dynamically adjusts the chemical dosing rate in response to measured sulfide levels, using parameter changes (dosing rate) to achieve the desired control outcome, thereby improving productivity through responsive adjustment without requiring overly complex system architecture.
3Loss of time
If manual control methods are used, then the system is easier to operate, but the response time and real-time control capability are insufficient
Solution Approach 1:
The patent implements continuous monitoring and continuous control adjustment through the automated system. The sulfide sensor operates continuously to detect sulfide levels, and the control unit continuously adjusts the dosing pump operation based on these measurements, eliminating the intermittent nature of manual sampling and control. This continuous operation reduces response time by constantly tracking and responding to sulfide level changes without manual intervention delays.
Solution Approach 2:
The real-time feedback loop between the sulfide sensor and control unit enables immediate response to changing sulfide conditions. When sulfide levels change, the sensor detects the change continuously and the control unit instantly adjusts dosing rates, providing rapid response time. This automated feedback mechanism eliminates the time loss associated with manual sampling, transportation, laboratory analysis, and manual adjustment, while the system remains simple to operate through automated decision-making.
Data Source
AI summary
A method of controlling addition rate of an odor control chemical to a wastewater line by adding odor control chemical to the wastewater. The method includes measuring a level of dissolved sulfides in the wastewater line using a sulfide probe placed in said wastewater line, transferring data on the level of dissolved sulfides to a computing unit, determining a required odor control chemical addition rate in said computing unit based on said level of dissolved sulfides, and adding the odor control chemical at said required addition rate. The method allows for accurate on-line control of the level of H2S in the wastewater line.