Advanced Granular Sludge Bed Reactor for Wastewater Treatment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Activated sludge processes for wastewater treatment face limitations such as requiring continuous air supply, oxidizing all biological elements, needing separate de-nitrification steps, forming flocculated sludge, having a large footprint, and high energy consumption, while sequencing batch reactors (SBR) face challenges in controlling anaerobic-aerobic microbial groups and energy efficiency.
Innovation Solution
The advanced granular sludge bed reactor (AGBR) process uses fluidized bed media and regulates redox reaction conditions, employing finely divided media to protect microbial cultures and control operational parameters like DO, pH, and ORP for simultaneous carbon and nutrient removal, reducing energy consumption by 30-40% and enhancing ammonia and total nitrogen removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional activated sludge process is used, then organic compound removal is achieved, but continuous air supply is required increasing energy consumption
Solution Approach 1:
The patent implements periodic alternation between aerobic and anaerobic phases in the SBR process. During aerobic phases, organic compounds are oxidized; during anaerobic phases, nitrification occurs without continuous air supply. This periodic action reduces energy consumption while maintaining treatment effectiveness.
Solution Approach 2:
The patent dynamically changes redox potential, dissolved oxygen concentration, and pH parameters to control microbial metabolism. By adjusting these parameters between phases, the system achieves efficient organic removal and nitrogen transformation without continuous aeration, reducing energy requirements.
2Device complexity
If single oxidation-reduction potential regime is used, then all biological elements are oxidized, but separate de-nitrification step is required
Solution Approach 1:
The patent merges nitrification and de-nitrification processes into a single SBR reactor by alternating aerobic and anaerobic phases. Nitrification occurs during aerobic phases when oxygen is available, while de-nitrification occurs during anaerobic phases. This integration eliminates the need for separate de-nitrification reactors, reducing system complexity while maintaining reliable nitrogen removal.
Solution Approach 2:
The periodic switching between aerobic and anaerobic conditions enables the same reactor to perform both nitrification and de-nitrification functions sequentially. This temporal separation of functions within a single reactor achieves complete nitrogen removal without requiring multiple dedicated treatment steps.
3Device complexity
If flocculated sludge is formed, then organic matter is removed, but mechanical separation through membrane or clarifier is needed
Solution Approach 1:
The SBR process incorporates a dedicated settling phase where flocculated sludge is allowed to settle under gravity. This periodic settling operation enables effective sludge-water separation without requiring complex mechanical separation systems like membranes or clarifiers, simplifying the overall system while maintaining separation efficiency.
4Area of stationary object
If large footprint is required, then separate reactors for each elemental conversion can be provided, but land area increases
Solution Approach 1:
The patent combines multiple elemental conversion processes (organic matter oxidation, nitrification, de-nitrification) into a single integrated SBR reactor through temporal separation of aerobic and anaerobic phases. This merging of functions in one reactor eliminates the need for multiple separate reactors, significantly reducing land area requirements while maintaining complete elemental conversion capability.
Solution Approach 2:
The periodic alternation between aerobic and anaerobic phases enables a single reactor to perform multiple treatment functions sequentially. This temporal multiplexing allows one reactor to replace what would traditionally require multiple reactors, reducing footprint while preserving adaptability for comprehensive wastewater treatment.
5Productivity
If anaerobic-aerobic microbial groups are controlled in SBR, then process efficiency is improved, but controlling microbial populations becomes complex
Solution Approach 1:
The patent uses parameter changes (aeration, pH, temperature, hydraulic retention time) to control microbial population dynamics. By adjusting these parameters during different phases, the system selectively promotes desired microbial groups (nitrifiers, denitrifiers, organic matter decomposers) while suppressing unwanted populations, improving process efficiency through controlled microbial ecology.
Solution Approach 2:
The SBR process incorporates monitoring of key parameters (dissolved oxygen, pH, redox potential, effluent quality) that provide feedback on microbial activity. This feedback enables automatic adjustment of aeration and other operational parameters to maintain optimal conditions for target microbial groups, simplifying microbial control through automated response to measured 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
The AGBR process improves sludge character, increases ammonia removal capacity by 1.5-3 times, forms robust sludge particles, and achieves efficient pollutant removal with reduced energy consumption and improved microbial protection, demonstrating better performance than traditional SBR processes.
Implementation Method 1
regulates redox reaction conditions
Implementation Method 2
continuous supply of air
Data Source
AI summary
An enhanced granular sludge bed (AGBR) process for wastewater treatment, including use of fluidized bed media and process control by regulating redox reaction conditions, is provided. Further embodiments may relate to multiple stage biological processes with fluidized bed media for simultaneous removal of carbon and nutrient from wastewater.