Biocide Dosing in White Water Circuits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In papermaking, the existing methods for dosing biocides and enzymes in white water circuits are inefficient due to variable flow rates and long dwell times, leading to uneven distribution, degradation, and increased environmental pollution, with a lack of consideration for production parameter changes, resulting in unstable biocidal effects and higher costs.
Innovation Solution
A method for discontinuous dosing of biocides and enzymes based on volume flow within the pipelines, ensuring constant biocide concentration at the headbox feed by metering directly into the pipeline area, using process parameters to adjust dosing, and allowing for multiple dosing points and combinations to optimize distribution and effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biocides are dosed continuously into the white water tank, then microorganisms are inhibited, but the biocide concentration is unstable due to variable flow rates and long dwell times
Solution Approach 1:
The patent divides the dosing operation into discrete, time-based intervals rather than continuous dosing. Each dosing interval is separated by a specific time period, creating segmented dosing cycles that adapt to the variable flow rates and dwell times in the white water tank, thereby stabilizing biocide concentration while maintaining effective microbial inhibition.
Solution Approach 2:
The patent implements dynamic dosing by adjusting the dosing intervals and amounts based on the actual flow rate and dwell time conditions in the white water tank. The dosing parameters are made variable and adaptive rather than fixed, allowing the system to respond to changing process conditions and maintain stable biocide concentration despite fluctuations in water flow.
2Reliability
If biocides are dosed into the white water tank, then slime formation is prevented, but the biocide degrades during the long dwell time in the tank
Solution Approach 1:
The patent applies preliminary action by dosing biocides at specific intervals before they are needed to prevent slime formation, rather than relying on continuous presence in the tank. The dosing is timed to occur at optimal moments when the water flow conditions favor effective biocide activity, reducing the time the biocide is exposed to degrading conditions in the tank.
Solution Approach 2:
The patent employs periodic dosing where biocides are introduced at regular time intervals rather than continuously. This periodic action allows the biocide to be fresh and highly effective at the moment of dosing, minimizing the cumulative degradation that would occur with continuous presence in the tank while still providing consistent slime prevention through repeated dosing cycles.
3Ease of operation
If the same biocide dosage is used regardless of flow rate changes, then the dosing system is simple, but the biocidal effect becomes unstable under varying production conditions
Solution Approach 1:
The patent introduces dynamic adjustment capabilities to the dosing system, allowing the biocide dosage and dosing intervals to vary based on actual flow rate measurements and process conditions. This dynamic approach maintains biocidal effect consistency across different production scenarios while adding manageable complexity through automated sensing and control mechanisms that respond to real-time data.
Solution Approach 2:
The patent implements feedback control by measuring actual flow rates and dwell times in the white water tank and using this information to adjust the dosing parameters. The system continuously monitors process conditions and automatically modifies the biocide dosing strategy to maintain optimal effectiveness, creating a closed-loop control system that adapts to changing production conditions.
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
This method maintains a stable biocide concentration in the treated area, reduces degradation, and minimizes environmental impact by precisely regulating biocide amounts, achieving maximum effectiveness while reducing costs and side effects.
Implementation Method 1
biocides and/or enzymes are introduced into the water cycle in order to inhibit the proliferation of microorganisms and to kill or damage them
Implementation Method 2
These organic ingredients form a good basis for the growth of various microorganisms such as bacteria, fungi or yeasts
Data Source
Figure 1
AI summary
The present invention relates to a method for treating aqueous process fluids in closed or semi-closed systems, which contain at least one storage tank (1) and associated pipelines, with biocides and/or enzymes to prevent and/or remove slime deposits by continuous and/or discontinuous dosing of the liquid active ingredients or solutions of the solid active ingredients, wherein the dosing of the active ingredients is carried out depending on the volume flow into the pipelines leaving the storage tank (1).