Constructed Wetland for Basin Water Pollutant Control
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Solution Overview
Problem
Water pollution in agricultural areas due to heavy metals, nitrogen, phosphorus, and organic matters in basin water resources cycling is severe, affecting crop growth and human health, necessitating a low-cost and effective method for pollutant control.
Innovation Solution
A method and device involving a constructed wetland with multiple layers of fillers and tanks for acidification and aeration to adsorb and degrade pollutants, utilizing synergistic physical, chemical, and biological effects among plants, microorganisms, and solid substrates, including functional biochar, zeolite, and bacteria to treat basin water before irrigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If basin water is directly used for irrigation without treatment, then water resources are conserved and agricultural productivity is maintained, but pollutant accumulation in crops occurs and human health is threatened
Solution Approach 1:
The constructed wetland is divided into multiple functional zones with different filler materials (gravel, sand, organic matter layers) to sequentially remove different types of pollutants. This segmentation allows simultaneous maintenance of water productivity while progressively eliminating heavy metals, nitrogen, phosphorus, and organic pollutants through adsorption and biodegradation in each layer.
Solution Approach 2:
The constructed wetland acts as an intermediary treatment system between basin water and irrigation fields. It uses plants, microorganisms, and filler materials as mediators to transform and remove pollutants, converting harmful basin water into safe irrigation water while maintaining water resource utilization.
2Reliability
If traditional sewage treatment methods are used, then pollutant removal efficiency is improved, but treatment cost increases significantly
Solution Approach 1:
The constructed wetland utilizes self-service mechanisms where native plants, microorganisms, and natural filler materials work autonomously to remove pollutants. The system requires minimal external energy input or chemical additives, relying on natural biological and physical processes to achieve reliable pollutant removal at low cost.
Solution Approach 2:
The wetland uses inexpensive, readily available filler materials such as local gravel, sand, and organic matter instead of expensive engineered treatment media. These materials can be sourced locally and replaced or regenerated at low cost, maintaining high pollutant removal efficiency without significant operational expenses.
3Reliability
If constructed wetland with multiple filler layers is implemented, then pollutant control effectiveness is improved, but device complexity increases
Solution Approach 1:
Different filler materials are placed in specific layers according to their local quality characteristics: gravel at the bottom for mechanical filtration and heavy metal adsorption, sand in the middle for physical filtration, and organic matter at the top for biodegradation of organic pollutants and nitrogen-phosphorus removal. This localized material placement maximizes pollutant control effectiveness while maintaining a relatively simple overall structure.
Solution Approach 2:
The constructed wetland employs composite material layers combining different natural materials (gravel, sand, organic matter, plants, microorganisms) that work synergistically. This composite approach achieves comprehensive pollutant removal (heavy metals, nitrogen, phosphorus, organic matters) through multiple mechanisms while keeping individual material requirements and overall system complexity manageable.
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
Effectively removes and degrades heavy metals, nitrogen, and phosphorus, ensuring safe irrigation water, promoting crop growth, and maintaining sustainable agriculture while protecting human health.
Implementation Method 1
adsorbing and degrading the pollutants through the synergistic physical, chemical and biological effects among plants, microorganisms and solid substrates in the constructed wetland
Implementation Method 2
adsorbing and degrading the pollutants through the synergistic physical, chemical and biological effects among plants, microorganisms and solid substrates in the constructed wetland
Implementation Method 3
physically remove or biodegrade heavy metals, nitrogen, phosphorus, organic matters and suspended matters in basin water
Data Source
AI summary
The present invention relates to a method and a device for controlling pollutants in basin water resources cycling utilization in agricultural activity areas. The method includes: providing an acidification tank, an aeration tank and a multi-media constructed wetland connected in sequence, which are 4˜10 m far from basin revetment, feeding basin water into the constructed wetland, adsorbing or degrading heavy metals and organic pollutants by the constructed wetland, and then transporting the treated basin water to the agricultural activity areas. The present invention effectively controls the content of heavy metals that will enter the agricultural activity areas, fundamentally reduces the content of heavy metals in the crops, promotes the growth of the crops, maintains sustainable and healthy development of agriculture, and therefore guarantees human health and safety.