Landscape water body ecological purification method based on modified vegetable tannin

Abstract

The invention discloses a landscape water body ecological purification method based on modified vegetable tannin. The method comprises the following steps: (1) an initial rapid purification stage: carrying out in-situ flocculation purification by utilizing the modified vegetable tannin; (2) a water quality long-acting maintenance stage: carrying out 1, bottom mud covering and pollution release blocking, 2, riverbed substrate biological membrane purification strengthening, 3, micro-nano oxygenation plug flow and hydrodynamic force improvement, 4, automatic circulation membrane filtration systemdeep treatment, and 5, submerged vegetation construction and ecological purification; and (3) a sudden emergency treatment stage: removing algae by in-situ flocculation of the modified vegetable tannin. The adopted modified vegetable tannin is good in flocculation effect, non-toxic, harmless, biodegradable, low in cost and capable of rapidly and efficiently removing suspended solids, pollutants and algae in the water body, the self-purification capacity of the water body can be obviously improved by coupling other technologies, and it is guaranteed that the water body stably reaches the standard for a long time.

Description

technical field [0001] The invention relates to an ecological purification method of a landscape water body based on modified plant tannin, and belongs to the technical field of water body purification in environmental governance. Background technique [0002] Landscape water bodies refer to water bodies that are naturally formed or artificially constructed to give people an aesthetic feeling in cities, villages and tourist attractions, such as large and small lakes, urban rivers, landscape fountains, etc. With the rapid development of economy and society, some landscape water bodies have been polluted and damaged to varying degrees, such as domestic sewage discharge, catering oil pollution, rainfall runoff non-point source pollution, etc., resulting in eutrophication of water bodies, algal blooms, reduced transparency, and even Blackening and smelly phenomenon appear. In order to improve the living standards of residents, the problem of landscape water pollution must be ef...

AI Technical Summary

Problems solved by technology

Among them, the physical methods include dredging, clearing water diversion, aeration and oxygenation, etc.: sediment dredging technology often requires a huge amount of engineering, and is likely to cause secondary pollution problems; water diversion technology is to dilute the concentration of impurities in water, increase the Self-purification capacity to improve water pollution is also a relatively common method, but for isolated, remote or closed water bodies, it is often difficult or difficult to introduce clear and turbid water bodies; aeration and oxygenation can increase dissolved oxygen in water bodies and improve black and odorous water bodies. However, it is difficult to fundamentally remove pollutants, especially for eutrophic water bodies.

The chemical method is mainly to add various chemical reagents to the water body to eliminate pollution, including adding chemical agents to kill algae, adding iron salts to promote phosphorus precipitation, adding lime to denitrify, etc., but the various toxic and harmful reagents used in the above methods are easy to cause pollution. Secondary pollution

Microbial method is a kind of in-situ remediation technology of water body, which involves the selection and domestication of microbial species. It is a new field of water remediation research, but there are few successful cases in practical application, high continuous cost and poor long-term operation stability.

The ecological restoration method is to use the life activities of animals such as cultivated plants or stocked fish in the natural ecology to transfer, transform and degrade the pollutants in the water, so that the pollutants can be degraded into CO 2 、H 2 O or other harmless substances; but this technology is slow to take effect, complicated to operate, and high in investment costs. When the pollution load exceeds the ecological restoration capacity, the effect is often poor, and it is easily disturbed by environmental conditions, especially in winter environments. Low, water quality is easy to rebound

[0004] Landscape water bodies are different from general river and lake water bodies. The environmental problems and technical requirements they face have their own uniqueness: (1) Urban landscape water bodies are mostly static or closed water bodies with poor fluidity. They generally have small areas, simple aquatic ecosystems, and water environment Small capacity, poor self-cleaning ability, etc., and due to design limitations, there are often dead ends, and the lack of water flow in the dead ends often leads to worsening water quality problems

(2) Due to the influence of residents’ lives and excessive breeding of ornamental fish in the water body, the pollution caused by the rain washing the ground, the settlement of floating dust in the air, and the scattering of leaves and garbage can easily cause the increase of suspended solids in the water and the decrease of transparency

(3) When the temperature is high, the water body rich in N, P and other nutrient elements will also grow algae, making the water body appear obviously green or even brown, accompanied by obvious fishy smell, which will not only make the whole landscape lose its original color Ornamental value, and even affect people's psychological feelings towards landscape water

(4) Traditional physical methods, chemical methods, microbial methods, and ecological restoration methods have their own advantages and disadvantages. Due to the unique properties of closed landscape water bodies, the single application of the above-mentioned treatment technologies cannot effectively purify landscape water bodies. target requirements

However, the traditional flocculation materials commonly used at present, including aluminum salt inorganic flocculants (such as aluminum sulfate, polyaluminum chloride), artificially synthesized polymer flocculants (such as polyacrylamide) and clay mineral flocculants, have environmental safety. There are different degrees of defects in aspects such as flocculation effect and cost.

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