Method and system for treating water pollution by utilizing in-situ micro-nano air flotation

Abstract

The invention discloses a method and a system for treating water pollution by utilizing in-situ micro-nano air flotation. The system comprises a micro-nano air flotation machine, a highly-efficient microbubble matrix, a water surface blue-algae collection matrix, a flotation-sedimentation integrated pool and a dehydration pool, wherein the highly-efficient microbubble matrix is arranged at the periphery and the bottom part of the system; the water surface blue-algae collection matrix is arranged at the periphery of the system and connected with an inlet of the flotation-sedimentation integrated pool through a pipeline; the micro-nano air flotation machine is connected with the highly-efficient microbubble matrix through a pipeline; the flotation-sedimentation integrated pool is also connected with the dehydration pool through a pipeline; and the dehydration pool is connected with an algae residue packaging machine which is connected with a belt conveyor. The device and the method provided by the invention reach a clearance rate of 92 to 95% to blue algae in a natural water body, can reach a clearance rate of 93% or above to ammonia nitrogen, total phosphorus and total nitrogen; and suspended substances and turbidity of effluent quality stably reach surface water standards of class-I to class-II.

Description

technical field [0001] The invention relates to a method and system for treating water pollution by in-situ micro-nano air flotation. Background technique [0002] The Environmental Protection Standard of the People's Republic of China "Environmental Engineering Terminology" clarifies the interpretation of "in situ treatment": the method of treating pollutants in the polluted area on the spot; "in situ treatment" corresponds to "ex situ treatment": It refers to the method of moving pollutants to the reactor or adjacent places to use engineering measures for pollution treatment. [0003] The characteristics of red tides and cyanobacterial blooms in oceanic red tides and land surface lakes and ponds are: once an outbreak occurs, it develops rapidly, pollutes a large area, has a huge volume of affected water, is greatly affected by climate, poisons the aquatic ecosystem, and is transmitted through the food chain. Secondary disasters are immeasurable and other factors, so far t...

AI Technical Summary

Problems solved by technology

[0006] 1. The status quo of urban sewage treatment: the basic process has not changed much in the past century. With the development of electronic technology, it has developed greatly in process control. In addition, due to the development of material science, various permeable membranes represented by MBR process are used in municipal sewage treatment. The advantage is that the water quality is stable, and the disadvantage is that the comprehensive cost is high. Others also have a large range of violations of laws and regulations, such as the mismatch between the plant and the network, or the suspension of production and sneaky drainage, and the direct drainage of underground wells.

[0007] 2. The status quo of rural sewage treatment: There are no sewage treatment facilities in the vast rural areas of China, and the production and domestic sewage and aquaculture wastewater are basically discharged directly. In addition, because my country is the world's largest consumer of chemical fertilizers and pesticides, agricultural non-point source pollution is relatively common, and the country drinks in rural areas. Investment in water and sewage treatment has increased year by year, but it is still a drop in the bucket;

[0016] 3. After water treatment, the cyanobacteria treatment and inactivation technology is not complete, the cyanobacteria are still alive, and the algal toxins after the disintegration of cyanobacteria vesicles are dissipated, etc. Therefore, improper disposal will cause secondary pollution of other water bodies and soil

[0019] 2. At present, countries and environmental organizations mainly use "ex situ treatment technology" on the shore for the outbreak of cyanobacteria blooms in lakes. The existing algae separation equipment can only simply extract algae-containing water through floating pumps installed on the shore. Or collect algae-enriched water with low algae content in the algae enrichment area of ​​the downwind outlet. Since this engineered system does not actively implement enrichment technology and intervention for algal blooms in the water body, the concentration of algae-containing water pumped is extremely low, and the scale of treatment is limited. Due to the limitation of the site, the treatment capacity is not large, and the efficiency is low. For a large area of ​​surface water, there is basically no effective removal of algae and fundamental improvement of the water body. It can only be used as a purposeful water treatment base station.

[0020] 3. There is an existing algae collection ship, but because there is no in-situ air flotation operation on the water body in advance, although it is possible to collect algae-enriched water from the algae-enriched area of ​​the lake water body to the operation ship and then use the plate-and-frame filter press, belt Type filter press for dehydration and separation, bagging the dehydrated algae mud and transporting it to land for secondary treatment. This method greatly improves the purpose of removing cyanobacteria "bloom", but the collection effect is still It is not ideal, and there is also the practical problem of low treatment efficiency, so it is of little significance for the improvement of the overall water quality of the lake and the removal of algae

[0021] The common point of the above three situations is that large-scale in-situ micro-nano air flotation pretreatment operations cannot be performed on the water body in advance, so the treatment efficiency is extremely low

In this case, in spring and winter, it is not conducive to the large-scale and large-scale reproduction of algae. Due to the large water surface area, large water body, and relatively low algae concentration in offshore waters, large lakes, and ponds, the treatment will operate. The embarrassing situation that the cost is high, the lake water cannot be purified, and the plankton population represented by algae cannot be controlled and pretreated

In summer and autumn, there are factors such as excessive algae reproduction speed, salvage speed that cannot keep up with the growth and reproduction speed of algae, low salvage operation efficiency, high labor costs, and insufficient investment. The key link, that is: did not grasp the main contradiction of "removing blue-green algae is the most efficient removal of pollutants in water"

Therefore, the algae separation system has lost the prevention and water purification of red-green algal blooms in oceans and lakes, and because the algal blooms cannot be removed in time, a large number of algae will die and disintegrate in the water, resulting in at least four obvious serious consequences: (1 ), doubling the algal biogathering and releasing pollutants back to the water body; (2), triggering various human and animal poisoning incidents in which algae toxins accumulate in the food chain; (3), offsetting the country's investment in valuable lake management investment funds (4) Algae cannot be produced daily, which will inevitably bring heavier intergenerational secondary disasters to the environment, and it is a geometric progression of environmental pressure

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