Modular Dual Vessel DAF System Segmentation
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Solution Overview
Problem
Conventional dissolved aeration flotation (DAF) systems are inefficient at low capacity operations, requiring large tank volumes and pump capacities, leading to high costs and maintenance needs, and suffer from sediment buildup and flow issues due to conventional effluent weir designs.
Innovation Solution
A modular dual vessel DAF system with independent treatment sections, inclined sludge plates, multi-stage flocculators, adjustable clear well risers, and a unique effluent weir design to improve efficiency, reduce sediment buildup, and enhance solids removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large flotation tank volume is used to achieve optimum dwell time for peak flow, then treatment effectiveness is improved, but system cost and footprint increase
Solution Approach 1:
The flotation system is divided into multiple independent treatment sections (e.g., two sections) that can operate simultaneously or independently. Each section has its own pump and aeration system, allowing the system to handle peak flows effectively while each individual section maintains a compact, cost-effective size. This segmentation resolves the contradiction by providing the total treatment capacity needed for peak flow without requiring each unit to be oversized for low-flow conditions.
2Productivity
If a large pump capacity is used to handle peak flow, then productivity is improved, but system cost and maintenance needs increase
Solution Approach 1:
The pumping system is segmented into multiple smaller pumps, each associated with a specific treatment section. Each pump is sized appropriately for its section's flow requirements rather than one large pump handling all flows. This reduces individual pump complexity and maintenance needs while maintaining total system productivity at peak flow levels.
Solution Approach 2:
The system allows dynamic operation where pumps can be activated or deactivated based on actual flow conditions. During low-flow periods, only necessary pumps operate; during peak flow, all pumps operate simultaneously. This dynamic configuration optimizes productivity while reducing complexity and maintenance requirements compared to a always-on large-capacity pump system.
3Ease of manufacture
If conventional effluent weir design is used, then ease of manufacture is improved, but sediment buildup and flow issues occur
Solution Approach 1:
Instead of the conventional weir design where effluent flows over the top surface, this system uses a bottom-inlet submerged weir design where effluent enters through the bottom and flows upward. This inversion prevents sediment from accumulating on the weir surface, eliminating the harmful sediment buildup effect while maintaining manufacturing simplicity. The enclosed top portion further prevents debris accumulation.
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 modular system achieves improved efficiency, reduced maintenance, and effective solids removal with adjustable height risers and laminar flow, while minimizing water velocity and sediment accumulation, making it more cost-effective and compact.
Implementation Method 1
dissolving air into the water under pressure to create gas-saturated water. When the gas-saturated water is depressurized the gas comes out of solution
Implementation Method 2
The aerated water is created by dissolving gas into the water in a high pressure environment until it reaches saturation level at that high pressure
Implementation Method 3
the gas comes out of solution forming bubbles which float to the surface of the tank
Implementation Method 4
The rising gas bubbles adhere to particulates in the wastewater and lift them to the surface
Implementation Method 5
Flocculate agents may be mixed with the wastewater prior to aeration to react with or bind to particulates, creating larger and less dense suspended coagulated particles
Implementation Method 6
an inclined sludge plate extending from the interior of the separation tank at a height below the liquid operating level of the system to at least the upper edge of the separation tank
Data Source
AI summary
A modular dual vessel DAF includes a frame, adjacent treatment sections mounted to the frame and including a multi-stage flocculator, aeration injector and mix chamber, stilling well, separation tank, effluent weir having an enclosed peaked upper portion and bottom inlet, clear well with height adjustable risers, surface skimmer, inclined sludge plate, and a sludge collection section, wherein the treatment sections may operate independently, in parallel, or in series. A modular dual vessel DAF may include a separator plate pack in each separation tank.