Two-stage A/O vertical flow artificial wetland sewage treatment system

A technology for sewage treatment system and constructed wetland, which is applied in the field of two-stage A/O type vertical flow constructed wetland sewage treatment system to achieve the effects of enhancing oxygen mass transfer capacity, reducing floor space and extending operating life.

Inactive Publication Date: 2008-06-25
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the combination of multi-level constructed wetland units according to different residence time, idle time and the realization of system internal reflux to enhance nitrogen and phosphorus removal.

Method used

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  • Two-stage A/O vertical flow artificial wetland sewage treatment system

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Experimental program
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Effect test

Embodiment 1

[0018] Add domestic sewage with average concentrations of COD, ammonia nitrogen, total nitrogen, and total phosphorus of 178mg / L, 18.7mg / L, 15.6mg / L, and 2.55mg / L, respectively, to strengthen the composite filler multi-stage alternating wetland system for COD, ammonia nitrogen, The removal rates of total nitrogen and total phosphorus are 95%, 98%, 96% and 99% respectively, and the average concentrations of COD, ammonia nitrogen, total nitrogen and total phosphorus in the treated effluent are 8.9mg / L, 0.374mg / L and 0.624mg / L , 0.03mg / L, reaching the sewage reuse standard.

Embodiment 2

[0020] From farm sewage, water body SS, COD, BOD, total nitrogen, PO 4 3- The concentration is 85-178mg / L, 210-378mg / L, 87-245mg / L, 210-350mg / L, 49-90mg / L, the raw water passes through the two-stage A / O type vertical flow artificial wetland treatment system, and the effluent SS, COD, BOD, total nitrogen, PO 4 3- The removal rates were 92%, 94%, 90%, 95%, 98%.

Embodiment 3

[0022] A two-stage A / O type vertical flow artificial wetland sewage treatment system device, the system device includes a pretreatment grit chamber and a multistage vertical flow artificial wetland, the outlet of the pretreatment grit chamber and the outlet of the multistage vertical flow artificial wetland The water inlet is connected, and the adjacent two levels of the multi-level vertical flow constructed wetland are connected. The first treatment unit of each level is an anoxic treatment unit, and the rest are "wet / dry" alternates of water intake, emptying, and idle For the aerobic operation unit, the last aerobic "wet / dry" alternate operation state processing unit of each level is connected with the anoxic processing unit of its corresponding level.

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Abstract

The invention relates to a system device for treating sewage in an A/O vertical flow constructed wetland, which is characterized in that the system device comprises a pretreatment desilting basin and a multilevel vertical flow constructed wetland; an outlet of the pretreatment desilting basin is connected with an inlet of the multilevel flow constructed wetland; two neighboring levels of the multilevel flow constructed wetland are communicated; the first processing unit of each level is a hypoxia unit; the rest processing units belong to aerobic 'wet/dry' alternating running-state processing units; the last aerobic 'wet/dry' alternating running-state processing unit of each level is communicated with the oxygen-poor processing unit of which the last aerobic 'wet/dry' alternating running-state processing unit is arranged.The constructed wetland system can strengthen nitrogen and phosphorus removal capacity of water and has high efficiency, fast phosphorus removal speed, small covering area, strong resistance to shock load and long service life of the wetland.

Description

1. Technical field [0001] The invention belongs to the technical field of sewage / wastewater treatment, in particular to a two-stage A / O type vertical flow artificial wetland sewage treatment system device. 2. Background technology [0002] Existing technology: Constructed wetland technology is considered to have the characteristics of low energy consumption, low maintenance, and the combination of sewage treatment and landscaping, and is widely used in municipal sewage treatment, industrial wastewater treatment, and agricultural wastewater treatment. However, there are still problems in this technology such as poor phosphorus and nitrogen removal effects, unstable operation, large floor area, and short service life. In recent years, people have been constantly looking for materials with high-efficiency phosphorus removal ability and easy access to low-cost materials as substrates in constructed wetlands. The principles for selecting these materials are the high content of Ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F3/32C02F3/30
CPCY02W10/10
Inventor 傅剑锋
Owner SOUTHEAST UNIV
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