Recirculating Aquaculture System with SBR Wastewater Treatment
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Solution Overview
Problem
In biofloc culture modes for Penaeus vannamei, excessive concentrations of total suspended solids (TSS) and nitrate nitrogen can hinder growth and survival by affecting breathing and physiological functions, necessitating effective removal methods.
Innovation Solution
A recirculating aquaculture system (RAS) incorporating a Sequencing Batch Reactor (SBR) wastewater treatment system with a buried activated sludge tank, solid-liquid separation mechanism, and controlled aeration, which treats TSS and nitrate nitrogen through a cyclical process of water inflow, stirring, aeration, settling, and drainage, maintaining optimal biofloc concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If biofloc culture mode is used to maintain water purification ability, then water quality control is improved, but excessive TSS and nitrate nitrogen concentrations harm Penaeus vannamei growth and survival
Solution Approach 1:
The system divides the culture environment into two distinct zones: a culture tank for Penaeus vannamei rearing and a separate SBR treatment tank for wastewater processing. This segmentation allows bioflocs to be maintained at optimal concentrations in the culture tank while excess TSS and nitrate nitrogen are removed in the separate treatment tank, eliminating the harmful effects on shrimp growth
Solution Approach 2:
The SBR treatment tank acts as an intermediary system between the culture tank and the external environment. It receives wastewater from the culture tank, processes the excessive TSS and nitrate nitrogen through activated sludge and aeration, and returns purified water to the culture tank, thereby mediating the harmful concentration buildup without directly exposing the shrimp to treatment processes
2Reliability
If high concentration of bioflocs is maintained for water purification, then toxic substance treatment is improved, but breathing and activities of Penaeus vannamei are hindered
Solution Approach 1:
The system separates the water purification function from the culture environment by locating the high-concentration biofloc treatment process in a dedicated SBR tank rather than in the culture tank. This allows the culture tank to maintain lower, non-hindering biofloc concentrations while still achieving effective toxic substance treatment through the separate treatment system
Solution Approach 2:
The system extracts the excessive TSS-containing wastewater from the culture tank and transfers it to the SBR treatment tank for processing. This extraction removes the harmful high-concentration bioflocs from the shrimp environment while preserving the water purification capability in the treatment system
3Productivity
If intensive culture is used to increase production, then productivity is improved, but water quality degradation accelerates
Solution Approach 1:
The SBR system operates continuously to treat wastewater generated by intensive culture operations. By maintaining constant aeration, mixing, and settling cycles in the treatment tank, the system continuously removes TSS and nitrate nitrogen, preventing water quality degradation even as production intensity increases
Solution Approach 2:
The system implements a feedback loop where treated water from the SBR tank is continuously recirculated back to the culture tank. This feedback mechanism ensures that water quality parameters are actively managed and adjusted based on the continuous treatment process, allowing intensive culture to proceed without proportional water quality deterioration
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 RAS effectively removes excessive TSS and nitrate nitrogen, maintaining lower biofloc concentrations to enhance water purification and prevent harm to Penaeus vannamei, ensuring improved growth rates and survival rates by recycling and purifying aquaculture water.
Implementation Method 1
an aeration device, which is provided with an air outlet pipeline leading to inner cavities of the culture tanks and the clean water tank
Implementation Method 2
a solid-liquid separation mechanism for performing solid-liquid separation on sewage in the buried activated sludge tank
Implementation Method 3
the output end of the sludge pump is connected with the input end of the plate and frame type filter press through the input pipe
Implementation Method 4
nitrification often occurs; and the concentration of nitrate nitrogen is increasing in water
Data Source
AI summary
The present invention discloses a recirculating aquaculture system (RAS) and method for shrimp culture through SBR wastewater treatment. The RAS includes a control cabinet, culture tanks, a clean water tank, a clean water filling pipeline, a drainage pipeline, a buried activated sludge tank and a solid-liquid separation mechanism. The solid-liquid separation mechanism comprises a sludge pump, an input pipe, a plate and frame type filter press and a liquid output pipe. An input end of the sludge pump is immersed in sewage of the buried activated sludge tank; and a clean water output end of the plate and frame type filter press is connected with the buried activated sludge tank through the liquid output pipe.