Self-circulation enhanced geothermal constructed wetland

Abstract

The invention discloses a self-circulation enhanced geothermal constructed wetland, comprising a self-circulation pool, a constructed wetland pool arranged in the self-circulation pool, a geothermal circulating water system provided with a hot water pipe and a water return pipe, and a first heater with an inlet communicating with the hot water pipe, wherein a water inlet pipe is arranged at the lower part of one side of the constructed wetland pool, a water outlet pipe is arranged at the upper part of the opposite side of the constructed wetland pool, a bearing net structure is arranged at the bottom of the constructed wetland pool, a heat preservation layer and a filler layer are sequentially arranged on the bearing net structure from bottom to top, the top surface of the filler layer is lower than a water surface in the self-circulation pool, breathable waterproof films are laid on the bottom surface of the bearing net structure and the top surface of the filler layer respectively, the first heater is arranged in the part, located at one side of the water inlet pipe, of the self-circulation pool, and an outlet of the first heater communicates with the water return pipe. According to the invention, shallow geothermal energy is used for continuous heating and heat preservation, the oxygen content of wetland bottom water and the uniformity of oxygen concentration distribution are improved, applicable limiting conditions are small, operation is easy and convenient, and long-term operation cost is low.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a self-circulating geothermal artificial wetland technology. Background technique [0002] With the development of the economy and the advancement of science and technology, environmental pollution has brought a huge impact on human life, and the problem of water environment pollution has become more and more serious. The improvement and remediation of the water environment cannot wait. In the field of water environment management, due to the characteristics of low investment, good effluent quality, low operation and maintenance costs, and aesthetic landscape, constructed wetlands are gradually being used as mainstream technologies by more and more countries. The process principle of constructed wetland is to use the synergistic effect of aquatic plants, microorganisms and filler matrix to remove pollutants in water through physical-chemical-biological ways such as sedim...

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Problems solved by technology

[0004] In order to utilize geothermal energy, in the prior art, there is a method of using geothermal energy for direct heat conduction or reheating after power generation to heat the water inlet pipe of the constructed wetland, but this technology has the limitation of requiring high-temperature geothermal resources, which has great restrictions on the environment , it is more difficult to obtain high-temperature shallow geothermal resources, and the number of conversions of geothermal heat is too many, resulting in complex structure, inconvenient management, high cost and operating costs, and at higher water temperatures, the concentration of dissolved oxygen in water will decrease, which is not It is conducive to maintaining the dissolved oxygen concentration in the water, and it will also lead to uneven distribution of oxygen concentration inside the constructed wetland. The oxygen content in the upper part of the wetland is high, while the bottom is seriously insufficient, which will reduce the sewage treatment effect

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