CN111646574A

CN111646574A - Urban river water environment treatment method

Info

Publication number: CN111646574A
Application number: CN202010491183.7A
Authority: CN
Inventors: 赵华菁; 陈蕾; 杨娜
Original assignee: Suzhou University
Current assignee: Suzhou University
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2020-09-11

Abstract

The invention discloses a method for treating urban river water environment. Isolating the water body in the river course by using a water-isolating wall and a soil-protecting pile along the river bank retaining wall in the river course to form a near bank zone, and having the whole function of collecting river-entering pollutants by a cut-off main pipe; the near-shore zone is divided into an ecological shallow water zone and a local deep water zone; the ecological shallow water area is filled with river silt and biological fillers, and the biological filler layer is planted with aquatic plants, so that all functions of purifying water quality and beautifying landscape of the ecological floating island can be realized; the local deep water area is arranged at the river inlet and drainage port, riverway sludge is filled, biological fillers are paved, and the water bottom elevation is lower than the river inlet and drainage port; and a sewage lifting pump is arranged at a fixed point in the near-shore zone, and various kinds of sewage in the near-shore zone are collected in a centralized manner and discharged into a municipal sewage system or an independent water treatment device. The invention has the advantages of convenient construction, small engineering investment, short construction period and low operation and maintenance cost, can effectively collect and treat the pollutants entering the river, and has popularization and application prospects in the aspect of river water environment treatment.

Description

Urban river water environment treatment method

Technical Field

The invention relates to a method for treating an urban river water environment, belonging to the field of water environment treatment and water ecology restoration.

Background

With the advance of urbanization in China, the water environment treatment task of the river channel is increasingly heavy. The main pollutants of the urban river are from domestic sewage and initial rainwater. On one hand, the phenomena of 'misconnection, mixed connection, mutual intercommunication and mutual permeation' of a sewage pipe and a rainwater pipe in a municipal drainage pipe network cause a large amount of domestic sewage to enter a river; on the other hand, a large amount of non-point source pollutants enter the river channel through urban rainwater pipelines or overflow under the rain wash. The two types of pollution sources have wide distribution range, large pollution amount and high difficulty in collecting and treating the pollution sources, and the quality of the urban river water environment is seriously influenced. In addition, the urban river channel generally has a hard revetment, which blocks the material biological exchange between the water body and the soil and damages the water ecology in the water-land transition area.

At present, the method for treating the urban river water environment mainly comprises the following three types: the first is to reduce the increment of pollutants, which is mainly realized by controlling the exogenous pollutants to enter the river channel; the second method is to reduce the storage of pollutants, such as removing river sludge or salvaging blue algae; the third is to increase the environmental capacity of the receiving water body, such as setting an ecological floating island or adding a microbial agent to improve the self-purification capacity of the water body. The collection and treatment of the river-entering pollutants are the basis for urban river water environment treatment, however, the current rainwater and sewage split system in China is imperfect, structural defects and functional defects of a sewage pipe network are very common, and a targeted treatment measure for initial rainwater pollution is lacked, so that exogenous river-entering pollutants are difficult to be effectively controlled. River channel dredging engineering relates to extensive dry river operation, and the construction degree of difficulty is great relatively, and the release of soil water pressure will cause the potential safety hazard to the bank wall in the work progress moreover, and old revetment collapse accident frequently takes place, and the silt of clearing out deals with the cost very high. Finally, although the ecological floating island commonly used for purifying water quality can improve the natural ecological environment of the river channel, the ecological floating island has long manufacturing and construction period, high management and maintenance cost, difficulty in passing winter and wind and wave resistance, and the problems and the defects restrict the popularization of the technology.

Disclosure of Invention

Aiming at the defects in the existing urban river water environment treatment technology, the invention provides the urban river multifunctional water environment treatment method which is convenient to construct, low in operation and maintenance cost and capable of effectively collecting and treating river-entering pollutants.

The technical scheme for realizing the aim of the invention provides an urban river water environment treatment method, in a river, a water body in the river is isolated by a water-stop wall and an earth-retaining pile along a river bank retaining wall, a near bank zone is arranged, and an ecological shallow water zone and a local deep water zone are arranged in the near bank zone; filling river sludge at the bottoms of the ecological shallow water area and the local deep water area, and then paving a biological filler layer, planting aquatic plants on the biological filler layer of the ecological shallow water area, and controlling the water depth of the shallow water area to be 20-30 cm; the local deep water area is arranged below the river inlet discharge port, and the water bottom elevation of the local deep water area is lower than the river inlet discharge port; and a sewage lifting pump is arranged at a fixed point in the near-shore zone, and various kinds of sewage in the near-shore zone are collected in a centralized manner and discharged into a municipal sewage system or an independent water treatment device.

The invention provides a method for treating urban river water environment, which has the preferable scheme that a water-proof wall is an acrylic plate and is fixed on the inner side of a soil conservation pile, and the top of the water-proof wall is 10-20 cm higher than the normal water level of a river; the soil conservation pile is a wood pile or a concrete pile and is fixed under a riverbed. The following structure may also be employed: the soil conservation pile and the water-stop wall are of an integrated structure and made of plastic steel Larsen sheet piles, the soil conservation pile is fixed under a riverbed, and the top height of the soil conservation pile is 10-20 cm higher than the normal water level of a riverway.

The invention provides a method for treating the water environment of an urban river, wherein a sludge layer of an ecological shallow water area and a sludge layer of a local deep water area are connected through a slope-shaped transition area.

The principle of the invention is as follows: a near bank belt is arranged along a river bank retaining wall in a river channel, is divided from the river channel by a water-stop wall and a soil-retaining pile, is not communicated with water in the river channel, can collect various river-entering pollutants, and has the whole function of collecting the river-entering pollutants by a cut-off main pipe; the inshore zone is divided into an ecological shallow water zone and a local deep water zone, the ecological shallow water zone is filled with river sludge and biological fillers, on one hand, the problem of treatment of part of river sludge can be solved, on the other hand, aquatic plants are planted on the biological filler layer, and all functions of purifying water quality and beautifying landscape of the ecological floating island can be realized; the local deep water area is arranged at the river inlet and drainage port, riverway sludge is filled, biological fillers are paved, and the height is limited by not influencing the outflow of the drainage port; and a sewage lifting pump is arranged at a fixed point in the near-shore zone, and various kinds of sewage in the near-shore zone are collected in a centralized manner and discharged into a municipal sewage system or an independent water treatment device. In dry weather, the pollutants entering the river mainly comprise domestic sewage, the domestic sewage flows into a near-shore zone of the river channel through a drain pipe for combining rain and sewage flow mixing and rain and sewage flow converging, biological fillers and aquatic plants in the near-shore zone are primarily purified, and then the pollutants are collected and discharged into a municipal sewage system by a lifting pump or enter an independent water treatment device for further purification and then enter the river. In the early stage of precipitation, non-point source pollutants formed after rainwater scours roads enter a near-shore zone in a river channel through runoff, are primarily purified by biological fillers and aquatic plants in the near-shore zone, and are collected and discharged into a municipal sewage system or enter an independent water treatment device for further purification by a lifting pump; in the middle and later periods of precipitation, the concentration of pollutants in the rainwater runoff is low, and after the rainwater runoff enters a near bank zone, the excessive runoff overflows the water-stop wall and is discharged into a river channel, so that urban drainage and waterlogging prevention are not influenced. Because the elevation of the near bank zone is not higher than the normal water level of the river channel, the function of regulating, storing and controlling the rain and water logging of the river network can not be influenced.

Compared with the prior art, the invention has the beneficial effects that:

1. the construction is convenient, the dry river operation is not needed, the engineering investment is small, and the construction period is short;

2. the system has all functions of intercepting the main pipe, and effectively controls pollutants to enter a river channel; meanwhile, all functions of the ecological floating island are achieved, maintenance is easier, and operation and maintenance cost is low;

3. the hard revetment can be softened to beautify the landscape; the reinforcing and protecting effects on old quay walls can be achieved;

4. can effectively collect and treat the pollutants entering the river, improve the ecological environment of the river channel, partially solve the problem of the outlet of silt of the dredging of the river channel and have popularization and application prospects in the aspect of river channel water environment treatment.

Drawings

Fig. 1 is a schematic plane structure diagram of a near-shore zone adopted by a method for treating an urban river water environment according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional structure diagram of a near-shore ecological shallow water area provided by an embodiment of the invention;

fig. 3 is a schematic cross-sectional view of a local deepwater zone according to an embodiment of the present invention.

In the figure, 1, a river channel; 2. river bank retaining walls; 3. entering a river discharge port; 4. an inshore ecological shallow water area; 5. a local deepwater zone; 6. a sewage lift pump; 7. soil conservation piles; 8. a water-stop wall; 9. a riverbed; 10. river sludge; 11. biological fillers; 12. an aquatic plant; 13. and (5) a normal water level.

Detailed Description

The technical scheme of the invention is further explained by combining the drawings and the embodiment.

Example 1

The embodiment provides a method for treating the water environment of an urban river, in particular to a method for constructing a near-shore zone along a river bank retaining wall in a river, which is suitable for treating the water environment of the urban river and restoring water ecology.

Referring to the attached drawing 1, it is a schematic plane structure diagram of a near shore zone related to the method for treating the urban river water environment provided by this embodiment; in this embodiment, the width of the river channel is 30 meters, the normal water level is 3.00 meters, and the specific method for constructing the near-shore zone is as follows: in the river channel 1, near bank zones are respectively arranged along the river bank retaining walls 2 on two banks, the near bank zones are divided from the river channel by a water-stop wall and soil-retaining piles, the width of the near bank zones is 2 meters, and the near bank zones are not communicated with water in the river channel and are used for collecting exogenous river-entering pollutants; the near-shore zone is provided with a near-shore ecological shallow water area 4 and a local deep water area 5, and in the embodiment, the ecological shallow water area is communicated with the local deep water area through a slope-shaped transition area. The local deep water area in the near bank zone is arranged below the river inlet discharge port 3; and a sewage lifting pump 6 is arranged at a fixed point in the near-shore zone, and is used for intensively collecting various kinds of sewage in the near-shore zone and discharging the sewage into a municipal sewage system or an independent water treatment device.

Referring to fig. 2 and 3, they are schematic sectional structural diagrams of the inshore ecological shallow water zone and local deep water zone in the inshore zone provided in this embodiment, respectively; the near-shore area is formed by isolating water in a river channel along a river bank retaining wall 2 through soil-retaining piles 7 and a water-isolating wall 8, the soil-retaining piles are wood piles or concrete piles and are fixed below a riverbed 9, the water-isolating wall is an acrylic plate and is fixedly installed close to the inner side of the soil-retaining piles, the height of the top of the near-shore area is slightly higher than the normal water level 13 of the river channel, in the embodiment, the height of the bottom of the riverbed is 0.50m, and the height from the top of the water-isolating wall is 2.60 m; referring to the attached figure 2, after river sludge 10 is filled on a bottom riverbed 9 of an ecological shallow water area near a bank, biological fillers 11 are paved, and the water depth of the shallow water area is controlled to be 20-30 cm; the aquatic plants 12 are planted on the biological filler layer, so that the problem of treatment of partial river silt can be solved, and the aquatic plants can realize the functions of purifying water quality and beautifying landscape and the like of the ecological floating island. Referring to the attached figure 3, the local deep water area is arranged below the river inlet discharge port 3, river sludge 10 is filled on a bottom riverbed 9 of the local deep water area, and then biological fillers 11 are paved, wherein the height is limited by not influencing the outflow of the discharge port, namely the water bottom elevation of the local deep water area is lower than the river inlet discharge port.

The soil conservation pile can also be made of a plastic steel Larsen sheet pile, at the moment, the soil conservation pile and the water-stop wall are integrated, and the top height of the soil conservation pile is 10-20 cm higher than the normal water level of the river channel; and fixed under the riverbed.

By adopting the technical scheme, in dry weather, the pollutants entering the river mainly comprise domestic sewage, the sewage flows into a near bank zone of a riverway through a drain pipe for combining rain and sewage mixed flow and rain and sewage, biological filler and aquatic plants in an ecological shallow water area are primarily purified, and then the sewage is collected and discharged into a municipal sewage system by a lifting pump or enters an independent water treatment device for further purification and then enters the river.

In the early stage of precipitation, non-point source pollutants formed after rainwater scours roads enter a near-shore zone in a river channel through runoff, are primarily purified by biological fillers and aquatic plants in an ecological shallow water area, and are collected and discharged into a municipal sewage system or enter an independent water treatment device for further purification through a lifting pump; in the middle and later periods of precipitation, the concentration of pollutants in the rainwater runoff is low, and after the rainwater runoff enters a near bank zone, the excessive runoff overflows the water-stop wall and is discharged into a river channel, so that urban drainage and waterlogging prevention are not influenced. Because the elevation of the near bank zone is not higher than the normal water level of the river channel, the function of regulating, storing and controlling the rain and water logging of the river network can not be influenced.

Claims

1. A method for treating urban river water environment is characterized by comprising the following steps: in the river course, isolating the water body in the river course along a river bank retaining wall by using a water-isolating wall and soil-protecting piles, arranging a near bank zone, and arranging an ecological shallow water area and a local deep water area in the near bank zone; filling river sludge at the bottoms of the ecological shallow water area and the local deep water area, and then paving a biological filler layer, planting aquatic plants on the biological filler layer of the ecological shallow water area, and controlling the water depth of the shallow water area to be 20-30 cm; the local deep water area is arranged below the river inlet discharge port, and the water bottom elevation of the local deep water area is lower than the river inlet discharge port; and a sewage lifting pump is arranged at a fixed point in the near-shore zone, and various kinds of sewage in the near-shore zone are collected in a centralized manner and discharged into a municipal sewage system or an independent water treatment device.

2. The method for treating the urban river water environment according to claim 1, wherein the method comprises the following steps: the waterproof wall is an acrylic plate and is fixed on the inner side of the soil conservation pile, and the top of the waterproof wall is 10-20 cm higher than the normal water level of the river channel; the soil conservation pile is a wood pile or a concrete pile and is fixed under a riverbed.

3. The method for treating the urban river water environment according to claim 1, wherein the method comprises the following steps: the soil conservation pile and the water-stop wall are of an integrated structure and made of plastic steel Larsen sheet piles, the soil conservation pile is fixed under a riverbed, and the top height of the soil conservation pile is 10-20 cm higher than the normal water level of a riverway.

4. The method for treating the urban river water environment according to claim 1, wherein the method comprises the following steps: the ecological shallow water area is connected with the local deep water area through a slope-shaped transition area.