Automated Chloramine Control System for Water Disinfection
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Solution Overview
Problem
Water systems face challenges in maintaining stable chloramine concentrations due to inaccurate control of chlorine-to-ammonia ratios, leading to issues like nitrification, over-chlorination, and low oxidation levels when using chloramines as disinfectants.
Innovation Solution
An automated chloramine injection and control system that determines residual chloramine concentrations in water samples and adjusts the addition of chlorine and ammonia accordingly to maintain desired levels, using a chemical dosing assembly and analyzer to ensure precise control and a weight ratio of chlorine to ammonia of 5:1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If chloramines are used as disinfectants instead of chlorine, then residual life is extended and disinfection byproduct formation is reduced, but control accuracy of disinfectant concentration deteriorates leading to nitrification and over-chlorination
Solution Approach 1:
The system continuously monitors chloramine concentration in the water distribution system and uses this feedback to automatically adjust the dosing rates of chlorine and ammonia. This closed-loop control prevents both over-chlorination and nitrification by maintaining chloramine levels within the desired range, resolving the control accuracy issue while preserving the extended residual life benefit of chloramines
Solution Approach 2:
The system enables automatic self-regulation of chloramine concentration through integrated sensors, controllers, and dosing equipment that work autonomously to maintain optimal disinfectant levels without requiring manual intervention, thereby achieving precise control while maintaining the advantages of chloramine usage
2Manufacturing precision
If automated control system is implemented to maintain precise chloramine concentrations, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The system combines multiple functions including chemical dosing, concentration monitoring, data processing, and automatic control into an integrated automated control system. By merging these previously separate components into a unified system, precise chloramine concentration control is achieved while minimizing the complexity that would result from having separate independent systems for each function
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
The system effectively maintains stable chloramine concentrations, preventing undesirable side-effects and ensuring consistent disinfection levels, as demonstrated by maintaining residual chloramine concentrations within set-points over extended periods.
Implementation Method 1
determining residual chloramine concentration in a first water sample obtained from the body of water
Implementation Method 2
a water system is typically dosed with hypochlorite and ammonia to produce monochloramine
Data Source
AI summary
A method of automatically controlling chloramine concentration in a body of water contained in a reservoir includes: (a) determining residual chloramine concentration in a first water sample obtained from the body of water; (b) automatically engaging a supply of chlorine to add chlorine to the body of water when the residual chloramine concentration in the first water sample is determined to be below a residual chloramine concentration set-point or a first chloramine concentration percentage; (c) determining residual chloramine concentration in a second water sample obtained from the body of water after step (b); and (d) automatically engaging a supply of ammonia and the supply of chlorine to add both ammonia and chlorine to the body of water if the residual chloramine concentration in the second water sample is determined to be below the residual chloramine concentration in the first water sample or a second chloramine concentration percentage.