Ecosystem for purifying mariculture water by composite constructed wetland in subtropical area and purification method

Abstract

The invention discloses an ecosystem for purifying mariculture water by composite constructed wetland in a subtropical area, wherein the circulation system comprises a water utilization system and a purification system, the purification system comprises surface flow wetland, a seawater pond, subsurface flow wetland and a water delivery facility; the surface flow wetland is a pretreatment system which uses a water pump to lift water or is introduced with seawater by a natural tide storage mode, and salt-tolerant and low-temperature resistant mangrove plants are planted on a main body of the surface flow wetland; the seawater pond is a planktonic and bacterial micro-ecological regulation region for accumulating seawater treated by the surface flow wetland; the subsurface flow wetland is a strong degradation adsorption functional zone, middle and upper layers of seawater is introduced to the seawater pond through laying a water supply pipe, and a main body of the subsurface flow wetland is formed by connecting a biological sedimentation bed, an aerated packed bed and a gravel bed in series. The system is large in scale of water treatment, short in hydraulic retention time, comprehensive in removal of culture water-quality pollution indexes and good in ecological landscape, and further can produce aquatic by-products with higher economic values.

Description

technical field [0001] The invention relates to the related technical field of purification and treatment of seawater aquaculture circulation water, in particular to an ecosystem for purifying seawater aquaculture water by compound artificial wetlands in subtropical regions. The invention also relates to an ecological system purification method for the compound artificial wetland in the upper subtropical zone to purify water for marine aquaculture. Background technique [0002] Constructed wetland is an artificially constructed, controllable and engineered wetland system, which has many advantages such as high efficiency, low consumption, and wide application range. It has been widely used to treat domestic sewage, industrial wastewater, mine and petroleum production wastewater, etc. Existing types of constructed wetlands have different removal capabilities for different forms of nitrogen and have their own advantages and disadvantages. For example, surface flow constructed ...

AI Technical Summary

Problems solved by technology

Existing types of constructed wetlands have different removal capabilities for different forms of nitrogen and have their own advantages and disadvantages. For example, surface flow constructed wetlands have strong reoxygenation ability, which is beneficial to the removal of oxygen-consuming ammonia nitrogen and organic pollutants, but they occupy a large area and require maintenance and management. The cost is high, and it is often used as a sewage pretreatment system; the horizontal flow constructed wetland has a small footprint, strong thermal insulation performance, and can withstand large hydraulic and pollutant loads, but the oxygen supply capacity is insufficient

The reoxygenation capacity of vertical flow constructed wetlands is better than that of horizontal flow constructed wetlands, but the cost is higher

Therefore, more and more researchers are focusing on the combination of two or more types of constructed wetlands, but seldom involve the large-scale treatment of seawater aquaculture.

The concentration of nitrogen and phosphorus pollutants in fresh seawater is low, but the demand for water is relatively large. However, the existing seawater artificial wetland treatment technology has a single purification index, which only targets pollutants such as nitrogen and phosphorus. The hydraulic retention time is long and the treatment capacity is small. Meet the high-volume water exchange requirements of seawater aquaculture, and less involve plankton and bacterial micro-ecological regulation

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