Vertical-flow artificial wetland treatment system capable of realizing cascade removal of pollutants in wastewater

Abstract

The invention discloses a vertical-flow artificial wetland treatment system capable of realizing cascade removal of pollutants in wastewater. The system comprises a plant rhizosphere pretreatment area, a modular matrix reinforced dephosphorization area, a microbial reinforced denitrification area, a porous interface organic matter treatment area and a gravel filtering area. In summer and autumn, wastewater flows from top to bottom through gravity to be treated; in winter and spring, the wastewater flows into wetland from bottom to top through a pump to resist impact of air temperature fall; cascade reinforcing removal effect of suspended particle (hereinafter referred to as SS), organic matter and nitrogen phosphorus is realized sequentially. Running mode of the wetland can be adjusted flexibly according to air temperature, and the problem of wetland treatment efficiency lowering caused by low temperature in autumn and winter is relieved; a porous system can improve the problem of blockage prevention of the wetland and can realize cascade comprehensive treatment of pollutants, and removal effect is good.

Description

technical field [0001] The invention relates to the field of constructed wetland sewage treatment, in particular to a vertical flow constructed wetland treatment system for realizing stepwise removal of pollutants in wastewater. Background technique [0002] With the development of economy and social progress, my country's water resources are also attacked by various pollutions. Water pollution is becoming more and more serious, and the ecological environment is destroyed, which seriously affects human survival. The current sources of water pollution mainly include: untreated industrial wastewater discharged, untreated domestic sewage discharged, farmland sewage caused by extensive use of chemical fertilizers, pesticides, and herbicides, etc. Solving the problem of water pollution is imminent. [0003] After the first complete constructed wetland was built in West Germany in the 1970s, the technology of constructed wetlands developed rapidly in Europe, the United States and ...

AI Technical Summary

Problems solved by technology

The three types of wetlands have their own outstanding advantages, but at the same time there are disadvantages, such as surface flow wetlands occupy a large area, have limited pollutant removal capacity and are not easy to survive the winter; horizontal subsurface flow constructed wetlands are expensive and relatively complicated to control; Vertical subsurface flow constructed wetlands have poor ability to treat organic matter and are prone to clogging

[0005] At present, there are many partially authorized or published patents related to constructed wetlands. Among them, the constructed wetland sewage treatment system and its method of purifying sewage (patent application number: 201510885723.9) realizes the resource utilization of plant straw, but its construction is complicated and expensive. Large; a sequential batch operation artificial wetland reclaimed water treatment system (patent application number: 201310189368.2) although it occupies a small area, the land utilization rate is not high and the wetland operation effect is not good in winter; the vertical The method of treating aquaculture wastewater by flowing constructed wetlands (patent application number: 201410137254.8) solves the problem of outlet for sludge in water supply plants, but cannot comprehensively remove organic matter and nitrogen and phosphorus

These methods have certain effects on the treatment of industrial wastewater and domestic sewage, but due to one or more defects such as complex construction, high cost, inability to comprehensively remove organic matter, nitrogen and phosphorus, and inability to survive winter, the popularization and application are limited

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