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Multistage artificial wetland system for treatment of heavy metal wastewater

A constructed wetland system and constructed wetland technology, applied in the field of wastewater treatment, can solve the problems of small amount of treated water, difficult control, secondary pollution, etc., and achieve the effects of increasing microbial biomass, improving processing capacity, and strong adsorption capacity

Inactive Publication Date: 2019-05-07
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional treatment process often has the disadvantages of small amount of treated water, high cost, high energy consumption, small scope of application, and easy to cause secondary pollution. The treatment cycle of biological treatment is too long and difficult to control

Method used

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  • Multistage artificial wetland system for treatment of heavy metal wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The multi-level constructed wetland system for treating heavy metal wastewater in this embodiment includes algae ponds, aeration ponds and multi-level constructed wetlands. The multi-level constructed wetlands at least include the first-level constructed wetland and the last-level constructed wetland. The waste water flows through algae ponds and multi-stage constructed wetlands in turn, and the effluent flowing through the last stage of constructed wetlands is recycled to the aeration pool for enhanced oxygen supply, and then flows through the first stage of constructed wetlands until it reaches the standard discharge. The multi-stage constructed wetlands Each level of constructed wetland includes a water inlet area 7, a reaction area and a water outlet area 8. The sewage flows through the reaction area and the water outlet area 8 successively from the water inlet area 7 in the form of porous water distribution; Pore ​​aerator, the microporous aerator is connected to th...

Embodiment 2

[0039] The multi-level constructed wetland system for treating heavy metal wastewater in this embodiment includes algae ponds, aeration ponds and multi-level constructed wetlands. The multi-level constructed wetlands at least include the first-level constructed wetland and the last-level constructed wetland. The waste water flows through algae ponds and multi-stage constructed wetlands in turn, and the effluent flowing through the last stage of constructed wetlands is recycled to the aeration pool for enhanced oxygen supply, and then flows through the first stage of constructed wetlands until it reaches the standard discharge. The multi-stage constructed wetlands Each level of constructed wetland includes the multi-level constructed wetland. Each level of constructed wetland includes a water inlet area 7, a reaction area and a water outlet area 8. The bottom of the aeration pool is provided with a microporous aerator. The microporous aerator is connected with the blower through...

Embodiment 3

[0055] The multi-level constructed wetland system for treating heavy metal wastewater in this embodiment includes algae ponds, aeration ponds and multi-level constructed wetlands. The multi-level constructed wetlands at least include the first-level constructed wetland and the last-level constructed wetland. The waste water flows through algae ponds and multi-stage constructed wetlands in turn, and the effluent flowing through the last stage of constructed wetlands is recycled to the aeration pool for enhanced oxygen supply, and then flows through the first stage of constructed wetlands until it reaches the standard discharge. The multi-stage constructed wetlands Each level of constructed wetland includes the multi-level constructed wetland. Each level of constructed wetland includes a water inlet area 7, a reaction area and a water outlet area 8. The bottom of the aeration pool is provided with a microporous aerator. The microporous aerator is connected with the blower through...

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Abstract

The invention discloses a multistage artificial wetland system for treatment of heavy metal wastewater. The system includes an algae pond, an oxygenation pool and a multistage artificial wetland. Themultistage artificial wetland at least includes a first stage artificial wetland and a last stage artificial wetland. Heavy metal wastewater flows through the algae pond and the multistage artificialwetland in order, the effluent water that flows through the last stage artificial wetland is recovered to the oxygenation pool, undergoes enhanced oxygen supply, and then flows through the first stageartificial wetland till up-to-standard discharge. Each stage of artificial wetland of the multistage artificial wetland includes a water inlet area, a reaction area and a water outlet area, and sewage flows through the reaction area and the water outlet area successively from the water inlet area in a porous water distribution way. A matrix layer of the reaction area includes an aquatic plant sand layer, a volcanic layer, a composite filler layer, a rice husk charcoal layer, and a gravel layer from top to bottom in order, and partition boards that are disposed in a vertical flow direction andrun through the aquatic plant sand layer, the volcanic layer, the rice husk charcoal layer, the composite filler layer and the gravel layer vertically, and a plurality of flow through-holes are distributed evenly on the partition boards. An algae pond and multistage artificial wetland coupled system is utilized to treat heavy metal wastewater to form an algae-bacteria-wetland submerged plant-composite filler collaborative treatment system, which not only can remove heavy metals from wastewater, but also can remove COD, BOD5, NH3-N and TP.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a multi-stage constructed wetland system for treating heavy metal wastewater. Background technique [0002] Heavy metal pollution mainly comes from two aspects: human activities and natural release. According to research, the contents of Pb, Zn and Cu in sewage are 30, 40 and 15 times their average contents in crustal rocks, respectively. Natural release mainly includes natural weathering and erosion and volcanic activity, etc. Generally speaking, heavy metals entering the water environment through natural means will not cause water pollution, but a large amount of heavy metal pollutants entering the water environment due to human activities will not only cause pollution Animals and plants in the water environment will cause direct harm, and will have serious adverse effects on human health and the entire ecological balance, causing incalculable economic and ecological losses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/20
Inventor 关伟杜建伟李开明温勇贺框张明杨
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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