CN-120081509-B - Embedded composite wetland system and enhanced removal of COD and NH3Method for N and TN

CN120081509BCN 120081509 BCN120081509 BCN 120081509BCN-120081509-B

Abstract

The invention discloses an embedded composite wetland system and a method for strengthening removal of COD, NH 3 -N and TN. The device comprises a primary regulating tank and a secondary regulating tank, wherein a primary aerobic regulating zone and a primary anoxic zone which is integrally arranged below the primary aerobic regulating zone are arranged in the primary regulating tank, a secondary aerobic regulating zone and a secondary anoxic zone which is integrally arranged below the secondary aerobic regulating zone are arranged in the secondary regulating tank, and the primary anoxic zone and the secondary anoxic zone are communicated through a communicating pipe. The invention discloses a device for treating anaerobic and anoxic sewage in a sewage treatment system, which comprises a first-stage aerobic zone, a second-stage aerobic zone, a first-stage anoxic zone, a second-stage anoxic zone, a reflux pump, a first-stage anaerobic zone, a second-stage anoxic zone, a first-stage anaerobic zone and a second-stage anoxic zone. Target pollutants are removed in a targeted manner by adjusting aeration quantity, reflux ratio and reflux quantity, and COD, NH3-N and TN are removed in a reinforced manner.

Inventors

HAN FEICHAO
SUN MIN
JIANG DONG
JIA FANGJIE
Dong Tuan
ZHANG JUNJIE
WU SHUYUAN
FEI XIAOXIN
XIA QIANHUA

Assignees

中冶华天工程技术有限公司

Dates

Publication Date: 20260508
Application Date: 20250325

Claims (7)

1. The method for the enhanced removal of COD, NH 3 -N and TN of the embedded composite wetland system is realized based on the embedded composite wetland system and is characterized in that the embedded composite wetland system comprises a primary regulating tank and a secondary regulating tank, wherein, A primary aerobic regulation zone and a primary anoxic zone which are integrally arranged below the primary aerobic regulation zone are arranged in the primary regulation tank; a secondary aerobic regulating zone and a secondary anoxic zone which are integrally arranged below the secondary aerobic regulating zone are arranged in the secondary regulating tank; The primary anoxic zone and the secondary anoxic zone are communicated through a communicating pipe; The method comprises the following steps: (A) When the COD and NH 3 -N of the inflow water are both higher and TN is lower, the aeration quantity of the primary aerobic regulation zone and the secondary aerobic regulation zone is increased, the reflux ratio is reduced, and the reflux quantity is reduced; (B) When COD, NH 3 -N and TN of the inflow water are high, the aeration quantity of the primary aerobic regulation zone and the secondary aerobic regulation zone is increased, the reflux ratio is improved, and the reflux quantity is increased; (C) When the COD and NH 3 -N of the inflow water are low and TN is high, the aeration quantity of the primary aerobic regulation zone and the secondary aerobic regulation zone is reduced, the reflux ratio is improved, and the reflux quantity is increased; (D) When COD, NH 3 -N and TN of the inflow water are low, the aeration quantity of the primary aerobic regulation zone and the secondary aerobic regulation zone is reduced, the reflux ratio is reduced, and the reflux quantity is reduced; (E) When COD of the inflow water is higher and NH 3 -N and TN are lower, the aeration quantity of the primary aerobic regulation zone and the secondary aerobic regulation zone is increased, the reflux ratio is reduced, and the reflux quantity is reduced; (F) When the COD of the inflow water is lower and the NH 3 -N and TN are higher, the aeration quantity of the primary aerobic regulation zone is reduced, the aeration quantity of the secondary aerobic regulation zone is increased, the reflux ratio is improved, and the reflux quantity is increased.
2. The method for the reinforced removal of COD, NH 3 -N and TN by an embedded composite wetland system according to claim 1 is characterized by further comprising a reflux system, wherein the reflux system comprises a reflux pump, a reflux water inlet pipe and a reflux water distribution pipe, the reflux water inlet pipe is arranged in the secondary regulating tank, and the reflux water distribution pipe is arranged in the primary regulating tank.
3. The method for the enhanced removal of COD, NH 3 -N and TN by an embedded composite wetland system according to claim 1 is characterized in that the primary aerobic regulation zone comprises aquatic plants, aquatic animals and an aeration device, the water depth h1 of the primary aerobic regulation zone is 0.5-3.0 m, and the hydraulic retention time t1 is 12-24 h.
4. The method for the reinforced removal of COD, NH 3 -N and TN by an embedded composite wetland system is characterized in that a filler and a water outlet collecting pipe are arranged in a primary anoxic zone, the filler in the primary anoxic zone comprises gravel, pebbles, zeolite, ceramsite, granular activated carbon, activated coke and/or biomass filler, the filler height is 0.5-3.5 m, the filler particle size is 5-150 mm, the hydraulic conductivity of the filler is 0.01-0.5 m/s, the hydraulic retention time of the primary anoxic zone is 8-16 h, and the bottom of the filler is provided with the water outlet collecting pipe communicated with the communicating pipe.
5. The method for the reinforced removal of COD, NH 3 -N and TN by an embedded composite wetland system is characterized in that a filler and a water inlet and distribution pipe are arranged in a secondary anoxic zone, the filler in the secondary anoxic zone is gravel, pebbles, zeolite, ceramsite and/or crushed stone, the filler height is 1.0-3.0 m, the filler particle size is 15-150 mm, the filler hydraulic conductivity is 0.02-0.5 m/s, the hydraulic retention time in the secondary anoxic zone is 8-12 h, and the water inlet and distribution pipe communicated with a communicating pipe is arranged at the bottom of the filler.
6. The method for the enhanced removal of COD, NH 3 -N and TN by an embedded composite wetland system according to claim 1 is characterized in that the secondary aerobic regulation zone comprises aquatic plants, aquatic animals and an aeration device, the water depth h2 of the secondary aerobic regulation zone is 0.5-2.0 m, and the hydraulic retention time t2 is 12-18 h.
7. The method for the enhanced removal of COD, NH 3 -N and TN of the embedded composite wetland system according to claim 2 is characterized in that the reflux water distribution pipe is communicated with the communicating pipe.

Description

Embedded composite wetland system and method for strengthening removal of COD, NH 3 -N and TN Technical Field The invention relates to an embedded composite wetland system and a method for strengthening removal of COD, NH 3 -N and TN. Background The constructed wetland is used as an ecological sewage treatment process, and has remarkable effect of removing pollutants such as organic matters, nitrogen, phosphorus and the like. In recent years, the constructed wetland is widely applied to tail water extraction of sewage treatment plants, bypass purification of river water bodies and the like. However, in practical applications, on the one hand, in the process combination design, it is common to simply combine the surface-flow wetland, the horizontal subsurface-flow wetland or the vertical subsurface-flow wetland in series, and different treatment functional areas are not divided for different target pollutants. In addition, a plurality of combined wetland processes adopted at present are all in a fixed mode, namely functional areas cannot be flexibly adjusted in the running process, so that certain pollutant removal effects are poor under different water quality conditions. Especially when the water quality is changed, if the water quality is still operated according to the initial design conditions, not only the indexes of partial pollutants are out of standard, but also other partial pollutants are excessively wasted. On the other hand, when combining a wet ground plane and a structural arrangement, it is currently common to use separate, i.e. each type of wet land is provided separately. The arrangement form not only occupies a large area, but also has high operation cost. Disclosure of Invention In order to overcome the defects, the invention aims to provide an embedded composite wetland system and a method for strengthening removal of COD, NH 3 -N and TN. In order to achieve the aim, the embedded composite wetland system comprises a first-stage regulating tank and a second-stage regulating tank, wherein, A primary aerobic regulation zone and a primary anoxic zone which are integrally arranged below the primary aerobic regulation zone are arranged in the primary regulation tank; a secondary aerobic regulating zone and a secondary anoxic zone which are integrally arranged below the secondary aerobic regulating zone are arranged in the secondary regulating tank; The primary anoxic zone and the secondary anoxic zone are communicated through a communicating pipe. The water distribution system comprises a first-stage regulating tank, a second-stage regulating tank, a water distribution pipe and a water distribution pipe. The primary aerobic regulation zone comprises aquatic plants, aquatic animals and an aeration device, wherein the water depth h1 of the primary aerobic regulation zone is 0.5-3.0 m, and the hydraulic retention time t1 is 12-24 h; Further, when the water depth of the primary aerobic regulation zone is 0.5-1.0 m, the aeration device is bottom aeration, and when the water depth of the primary aerobic regulation zone is 1.0-3.0 m, the aeration device is bottom aeration, surface aeration, fountain aeration or a combination of the above aeration modes. The first-stage anoxic zone is internally provided with a filler and a water outlet collecting pipe, wherein the filler in the first-stage anoxic zone comprises gravel, pebbles, zeolite, ceramsite, granular activated carbon, activated coke and/or biomass filler, the filler height is 0.5-3.5 m, the filler particle size is 5-150 mm, the hydraulic conductivity of the filler is 0.01-0.5 m/s, the hydraulic retention time of the first-stage anoxic zone is 8-16 h, and the bottom of the filler is provided with the water outlet collecting pipe communicated with the communicating pipe. Further, a filler and a water inlet and distribution pipe are arranged in the secondary anoxic zone, the filler in the secondary anoxic zone is gravel, pebbles, zeolite, ceramsite and/or crushed stone, the filler height is 1.0-3.0 m, the filler particle size is 15-150 mm, the filler hydraulic conductivity is 0.02-0.5 m/s, the hydraulic retention time in the secondary anoxic zone is 8-12 h, and the water inlet and distribution pipe communicated with a communicating pipe is arranged at the bottom of the filler. Further, the secondary aerobic regulating zone comprises aquatic plants, aquatic animals and an aeration device, the water depth h2 of the secondary aerobic regulating zone is 0.5-2.0 m, and the hydraulic retention time t2 is 12-18 h. Further, when the water depth h2 of the secondary aerobic regulation zone is 0.5-1.0 m, the aeration device is bottom aeration, and when the water depth h2 of the secondary aerobic regulation zone is 1.0-2.0 m, the aeration device is bottom aeration, surface aeration, fountain aeration or a combination of the above aeration modes. Further, the reflux water distribution pipe is communicated with the communicating pipe. In order to achieve the pu