Integrated Aeration Filtration for Compact Wastewater Denitrification
Solution Overview
Problem
Conventional water treatment methods for organic wastewater face inefficiencies in denitrification and digestion treatments due to the inability to effectively capture fine SS and soluble BOD, leading to increased facility space requirements and prolonged treatment times, which affect denitrification efficiency.
Innovation Solution
A water treatment method involving an aeration process for initial adsorption, followed by filtration, digestion, biological denitrification, sludge transfer, and an adjustment process based on nitrogen concentration to manage activated sludge flow, using aeration tanks, filters with circulating surfaces, and membrane bioreactors to optimize treatment efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If an initial adsorption process using activated sludge is introduced to capture fine SS, BOD, and soluble BOD, then the amount of gas produced by anaerobic digestion increases, but the facility space requirement increases due to the need for both aeration tank and sedimentation tank
Solution Approach 1:
The patent combines the aeration function and sedimentation function into a single integrated tank. The aeration tank is equipped with both aeration devices for biological treatment and sludge separation devices for solid-liquid separation, eliminating the need for a separate sedimentation tank while maintaining the ability to capture fine SS, BOD, and soluble BOD for enhanced gas production
Solution Approach 2:
The aeration tank is designed to perform multiple functions simultaneously: it serves as both the aeration tank for initial adsorption of organic matter and the sedimentation tank for solid-liquid separation. This multi-functional design reduces facility space while preserving the benefits of enhanced digestion through improved capture of fine suspended solids and soluble organic matter
2Manufacturing precision
If the residence time in aeration tank and sedimentation tank is extended to ensure adequate BOD removal, then the initial absorption treatment becomes excessive, but the denitrification treatment of supernatant is insufficient and treatment time increases
Solution Approach 1:
The patent implements a feedback control mechanism where the sludge return flow rate from the sedimentation tank to the aeration tank is adjusted based on measured parameters such as BOD concentration and nitrogen concentration in the supernatant. This feedback control optimizes the balance between BOD removal in the aeration tank and denitrification efficiency, preventing excessive BOD removal that would hinder subsequent denitrification while ensuring adequate treatment
Solution Approach 2:
The system dynamically adjusts operational parameters including the sludge return flow rate and aeration intensity based on real-time water quality measurements. This dynamic adjustment allows the system to optimize the residence time and treatment intensity to achieve adequate BOD removal without over-treating, thereby maintaining sufficient organic matter for effective denitrification
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 method achieves efficient digestion and denitrification by adjusting activated sludge flow and treatment processes, reducing facility space requirements and improving denitrification efficiency by quickly responding to changes in nitrogen concentration.
Implementation Method 1
an aeration process for performing an initial absorption treatment by aerating the water to be treated
Implementation Method 2
The initial adsorption means physically adsorbing fine particles and soluble BOD in the water to be treated by collecting them onto a surface of the activated sludge
Implementation Method 3
a filtration process for filtering the water to be treated which has been treated by the initial absorption treatment in the aeration process
Implementation Method 4
a digestion treatment process for digesting solids captured by the filtration process
Implementation Method 5
a biological treatment process for denitrifying, with activated sludge, filtered water obtained through the filtration process
Data Source
AI summary
A water treatment method treats raw water (water to be treated) containing organic wastewater. The method includes (i) an aeration process performs an initial absorption treatment by aerating the water to be treated, (ii) a filtration process for filtering the water to be treated which has been treated by the initial absorption treatment in the aeration process, (iii) a digestion treatment process for digesting solids captured by the filtration process, (iv) a biological treatment process for denitrifying, with activated sludge, filtered water obtained through the filtration process, (v) a sludge transfer process for sending the activated sludge from the biological treatment process to the aeration process, and (vi) an adjustment process for adjusting an amount of the activated sludge sent to the aeration process via the sludge transfer process based on a nitrogen concentration of treated water which has been biologically treated by the biological treatment process.