A/A/O-MBR Wastewater Reuse for High-Organic Coating Effluent
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Solution Overview
Problem
The rapid growth of the water-based environmental-friendly coatings market in China has led to an increase in high-concentration organic wastewater from acrylic resin production, causing environmental pollution and burdening downstream treatment enterprises, necessitating an effective treatment and reuse system for wastewater from equipment cleaning, filter cloth cleaning, laboratory, and RTO flue spray.
Innovation Solution
A chemical sewage treatment and reuse system comprising a regulation tank, A/A/O biological treatment system, MBR treatment system, and electrical control system, with components like grating tanks, sedimentation tanks, membrane bio-reactors, and aerators, utilizing heat exchangers, pH regulators, and PLC control for efficient treatment and reuse of wastewater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional sewage treatment methods are used, then treatment cost is reduced, but treatment efficiency and water quality standards are not met
Solution Approach 1:
The treatment system is divided into multiple specialized modules: AAO biological treatment system for organic matter removal, MBR membrane bioreactor for suspended solids and pathogen removal, and advanced treatment units for nutrient removal. Each module targets specific pollutants, achieving comprehensive water quality improvement through segmented functional units rather than a single complex process.
Solution Approach 2:
The system implements preliminary action through pre-treatment stages including equalization tanks for water quality stabilization, pre-aeration for oxygen preparation, and pre-sedimentation for coarse particle removal before the main treatment processes. This preliminary conditioning ensures optimal performance of subsequent treatment modules and prevents shock loads.
2Manufacturing precision
If advanced treatment methods are used, then water quality standard is met, but energy consumption increases
Solution Approach 1:
The system maintains continuous useful action through 24/7 operation of aerators and pumps, continuous membrane filtration in the MBR system, and uninterrupted biological treatment in AAO reactors. This continuous operation prevents energy-intensive startup/shutdown cycles and maintains stable treatment efficiency, reducing overall energy consumption per unit of treated water.
Solution Approach 2:
The system employs parameter changes including temperature control in biological reactors to optimize microbial activity, dissolved oxygen level adjustment in different reactor zones, and pH regulation to maintain optimal treatment conditions. These parameter optimizations ensure high treatment efficiency while minimizing energy input requirements.
3Loss of substance
If biological treatment systems are used, then organic matter removal is improved, but sludge production increases
Solution Approach 1:
The system implements discarding and recovering by separating sludge into different streams: excess sludge is discarded after stabilization and dewatering, while activated sludge is recovered and recycled back to the bioreactors. The MBR system also recovers water through membrane filtration, concentrating contaminants in the reject stream for disposal while recovering clean permeate for reuse.
Solution Approach 2:
The system converts the harmful effect of sludge production into benefit by using produced sludge as a source of active microorganisms for treatment enhancement, stabilizing sludge through anaerobic digestion to reduce its volume and pathogenicity, and utilizing digested sludge as a soil conditioner or fuel source, thereby transforming a waste problem into a resource.
4Loss of substance
If multiple treatment stages are implemented, then comprehensive pollutant removal is achieved, but system operation complexity increases
Solution Approach 1:
The system implements self-service through automatic control systems that monitor and adjust aeration rates, pump operations, and chemical dosing based on real-time sensor data. The MBR system automatically maintains membrane flux through controlled suction, and the equalization tanks automatically balance hydraulic and organic loads. This automation reduces manual intervention requirements while maintaining comprehensive pollutant removal across multiple treatment stages.
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 system effectively treats and reuses wastewater, meeting quality standards, reducing energy consumption and costs, minimizing environmental impact, and ensuring stable operation with low noise and odor, while maintaining high efficiency and ease of maintenance.
Implementation Method 1
separation tank and membrane tank internally provided with MBR membrane module
Implementation Method 2
aerator communicates with the bottom of the primary sedimentation tank, the bottom of the aerobic tank and the bottom of the membrane tank through a pipeline
Implementation Method 3
the regulation tank is internally provided with a heat exchanger and a regulation tank lifting pump. The heat exchanger communicates with an external heat source
Implementation Method 4
primary sedimentation tank and a regulation tank which communicate with the raw water tank in sequence
Data Source
AI summary
Disclosed is a chemical wastewater treatment and reuse system, which corresponds to a raw water tank and includes a regulation tank pretreatment system, an A/A/O biological treatment system, an MBR treatment system and an electrical control system. The regulation tank pretreatment system includes a grating tank, a primary sedimentation tank and a regulation tank that sequentially communicate with the raw water tank. The A/A/O biological treatment system includes an anaerobic tank group and an aerobic tank group that sequentially communicate with the regulation tank. The MBR treatment system includes a separation tank and a membrane tank that sequentially communicate with the aerobic tank group, the membrane tank communicates with a clarification tank, and the membrane tank and the clarification tank jointly communicate with the sedimentation tank. The sedimentation tank sequentially communicates with a clear water tank, a discharge tank, an advanced treatment tank and a reused water tank.