Method for purifying wastewater by constructed wetland comprising microbial carrier

Abstract

The invention discloses a method for purifying wastewater by a constructed wetland comprising a microbial carrier. Multilayer filler of a vertical flow constructed wetland includes: a sandy oil covering layer, an aerated brick powdery particle layer and a gravel layer sequentially from bottom to top; Scirpus validus is planted on the sandy soil covering layer, the sandy soil covering layer comprises the microbial carrier, and earthworms are also put in the sandy soil covering layer; the self-made microbial carrier material added herein has good hydrophilicity and microbial attachment and can be added to constructed wetland base to adsorb mass wastewater treatment microbes, improving aeration and the ability of microbes to remove nitrogen and phosphorus; gravels are widely sourced, low in cost, good in breathability and water adsorption and helpful for aeration and oxygen supply for a constructed wetland base system and for adsorbing pollutants; the earthworms added herein can prevent the constructed wetland from being blocked and increase oxygen supply.

Description

technical field [0001] The invention relates to the field of constructed wetlands, in particular to a method for purifying waste water in constructed wetlands containing microbial carriers. Background technique [0002] Constructed wetlands are ecosystems that use the material and energy cycles between substrates (or fillers, biological carriers), plants, and microorganisms to treat sewage. The purpose of pollutant removal is achieved through the synergistic effect of physics, physicochemistry and biology among various parts. [0003] Microorganisms are the core of the constructed wetland to achieve the decontamination function, and they work together to form a mutually beneficial and symbiotic organic system to jointly complete the task of sewage purification. The biofacies in the constructed wetland system are extremely rich, mainly including bacteria, fungi, algae, protozoa and metazoa. Microorganisms mainly include bacteria, actinomycetes and fungi. [0004] Bacteria ...

AI Technical Summary

Problems solved by technology

[0007] At the same time, judging from the existing technical practice, the amount of oxygen carried by the influent water in the constructed wetland system is low, the ability of atmospheric reoxygenation and plant root system oxygen release is limited, and the aerobic degradation of organic matter in sewage and the nitrification process of denitrification require sufficient oxygen. Oxygen, so the dissolved oxygen in the constructed wetland cannot meet the needs of a large number of pollutants degradation, limiting the nitrification reaction of organisms

Therefore, there is an urgent need for a new constructed wetland to solve the problem of insufficient degradation capacity.