Pure Water Production Using Hydrogen Peroxide Neutralization
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Solution Overview
Problem
Existing methods for treating urea in pure water production using biological activated carbon face challenges in managing ionic load and powdered carbon generation, particularly after oxidative decomposition with hypobromous acid, which can impact treatment efficiency and increase costs.
Innovation Solution
A method involving an oxidation treatment with hypohalous acid, followed by hydrogen peroxide addition to reduce residual chlorine levels, and a biological treatment using activated carbon columns with microorganisms, to improve treatment efficiency and control powdered carbon production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oxidative decomposition treatment using hypobromous acid is applied to treat urea, then urea removal efficiency is improved, but residual oxidizing agent affects biological treatment performance and generates powdered carbon
Solution Approach 1:
The patent introduces a reducing agent as an intermediary substance between the oxidative decomposition step and the biological treatment step. This reducing agent neutralizes the residual oxidizing agent (hypobromous acid) that would otherwise harm the biological treatment performance, while being designed to decompose completely without generating harmful byproducts or excessive ionic load.
Solution Approach 2:
The patent converts the harmful residual oxidizing agent into a beneficial state by using a reducing agent to transform it into harmless substances. The residual hypobromous acid, which would normally damage biological activated carbon and reduce treatment efficiency, is converted into beneficial neutralized form that allows subsequent biological treatment to proceed effectively.
2Reliability
If a reducing agent is added prior to biological treatment to remove residual oxidizing agent, then biological treatment performance is improved, but treatment costs increase due to increased ionic load
Solution Approach 1:
The patent carefully selects and controls the parameters of the reducing agent, specifically choosing substances with low molecular weight and low ionic load characteristics. By changing the chemical parameters (molecular weight, ionic composition) of the reducing agent, the patent achieves effective neutralization of residual oxidizing agent while minimizing the increase in ionic load that would lead to higher treatment costs in subsequent pure water production processes.
Solution Approach 2:
The patent applies the reducing agent locally and selectively to neutralize only the residual oxidizing agent without introducing excessive impurities. The reducing agent is applied in controlled amounts and at specific points in the treatment process to achieve local neutralization where needed, rather than throughout the entire system, thereby minimizing overall ionic load increase.
3Device complexity
If residual oxidizing agent is not removed before biological treatment, then treatment process remains simple, but powdered carbon generation increases and affects subsequent treatments
Solution Approach 1:
The patent applies preliminary action by introducing the reducing agent before the biological treatment step to pre-neutralize the residual oxidizing agent. This preliminary neutralization prevents the oxidizing agent from damaging the biological activated carbon and generating powdered carbon during the subsequent biological treatment, thereby avoiding more complex treatment issues downstream while maintaining relatively simple overall process structure.
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 approach effectively suppresses ionic load increases, enhances biological treatment efficiency, and moderates powdered carbon generation, ensuring high-quality pure water production while minimizing treatment costs.
Implementation Method 1
an oxidation treatment step of adding a hypohalous acid to a water to be treated containing urea to conduct an oxidation treatment of the urea
Implementation Method 2
a hydrogen peroxide addition step of measuring the residual chlorine concentration of the oxidation treated water obtained in the oxidation treatment step and then adding hydrogen peroxide to the oxidation treated water in accordance with the measured residual chlorine concentration
Implementation Method 3
a biological treatment step of subjecting the hydrogen peroxide-added water containing the added hydrogen peroxide to a biological treatment with a biological activated carbon
Data Source
AI summary
The purpose is to provide a pure water production method and apparatus, which make it possible to prevent the increase in an ion load during a pure water production process, improve the efficiency of a biological treatment and reduce the generation amount of pulverized coal in a method for treating oxidation-treated water in which urea is oxidized and decomposed with a hypohalous acid with biological activated carbon. Provided is a pure water production method including: for adding a hypohalous acid to urea-containing water of interest and performing an oxidation treatment of the urea in an oxidation treatment apparatus; and measuring the concentration of residual chlorine in the oxidation-treated water, then adding hydrogen peroxide to the oxidation-treated water depending on the measured concentration of the residual chlorine, and then performing a biological treatment of the hydrogen peroxide-added water with biological activated carbon in a biological treatment apparatus.