CN101817590A

CN101817590A - Turn-back horizontal flow wetland water quality advanced purification technology

Info

Publication number: CN101817590A
Application number: CN200910264547A
Authority: CN
Inventors: 柯凡; 李文朝; 潘继征; 冯慕华
Original assignee: Nanjing Institute of Geography and Limnology of CAS
Current assignee: Nanjing Institute of Geography and Limnology of CAS
Priority date: 2009-12-28
Filing date: 2009-12-28
Publication date: 2010-09-01

Abstract

The invention provides an idea of changing the fluid state of a conventional horizontal flow wetland, which comprises that: a lower partition board and an upper partition board are added in a direction vertical to a water flow so as to guide the water flow and make water energy entering the wetland fully flow through the interior of the whole wetland, and simultaneously mud removal measures are added in the wetland. When the mean concentration of total phosphorus in the entering water is 0.63 mg/L, the concentration of total nitrogen is 8 mg/L and hydraulic load is 0.1 m<3>/m<2>.d, mean rates of removal of the total phosphorus and the total nitrogen can reach 80 percent and 65 percent respectively. The technology can be applied in the field of the advanced treatment of tail water in sewage treatment works as an independent treatment process or in combination with other process units, also can be used for the treatment of domestic sewage in outskirts of cities (rural areas) and the bypass treatment of rivers polluted by the domestic sewage in combination with a micro-aeration vertical flow wetland, or is applied to a system for purifying estuarine wetlands of inflow rivers in combination with units, such as submerged plant oxidation ponds and the like.

Description

Turn-back horizontal flow wetland water quality advanced purification technology

Technical field

Turn-back horizontal flow wetland water quality advanced purification technology can be used as independent treatment process or forms the deep purification of tail water field that tandem process is applied to sewage work with other technique unit couplings; Also can connect and be used for the processing of outskirts of a town (rural area) sanitary sewage and handled by the bypass in the river of sanitary sewage pollution with micro-aeration vertical flow wetland; Perhaps be applied to ingoing river estuarine wetland purification system with unit couplings such as submerged plant oxidation pond.

Background technology

Because wet land system is at purification of water quality, improve the ecological environment, build the advantage on the landscape effect, wetland technology obtains very big development and application in recent years, artificial swamp especially for the purification of water quality aspect has obtained approval widely especially, level (diving) stream wetland is the wetland of a kind of special fluidised form in the artificial swamp, water is that along continuous straight runs flows through in the hypothallus of wetland, but such fluidised form just causes water in hypothallus bottom and the root system of plant layer to retardance easily, fails to make full use of on the surface-area of the surface-area of hypothallus and root system of plant and the effect of performance purification of water quality.

Patent of the present invention is on the basis of experimental study, proposed to change the thinking of conventional horizontal-flow wetland fluidised form, promptly increasing lower clapboard and upper spacer perpendicular to water (flow) direction, direction with the guiding current, so that enter the water of the wetland whole wetland inside of flowing through fully, improving " contact rate " of matrix and plant and water, is that 0.63mg/L, total nitrogen concentration are that 8mg/L, hydraulic load are 0.1m in water inlet total phosphorus mean concns ³/ m ²Under the situation of d, total phosphorus and average total nitrogen removal can reach 80% and 65% respectively.

Through meticulous design, the spoil disposal measure of having set up a whole set of in turn-back horizontal flow wetland is to improve the work-ing life of wetland.

Summary of the invention

1, turn-back horizontal flow wetland structural system is with wetland hypothallus sludge drainage system;

2, turn-back horizontal flow wetland is used for the technology of profound purification.

Description of drawings

Accompanying drawing 1 is a turn-back horizontal flow wetland structure sectional side elevation, and numbering wherein is as shown in table 1:

Numbering in table 1 accompanying drawing 1 describes in detail

Accompanying drawing 2 is a turn-back horizontal flow wetland sludge drainage system structure sectional side elevation, and numbering wherein is as shown in table 2:

Numbering in table 2 accompanying drawing 2 describes in detail

Accompanying drawing 3 is a spoil disposal pipeline distribution plan, and numbering wherein is as shown in table 3:

Numbering in table 3 accompanying drawing 3 describes in detail

Accompanying drawing 4 is a turn-back horizontal flow wetland structure vertical view, and numbering wherein is as shown in table 4:

Numbering in table 4 accompanying drawing 4 describes in detail

Embodiment

1, waterpower is calculated

Require to calculate hydraulic load according to actual design treatment scale, contaminant degradation kinetic equation and Pollutant levels limit value, calculate the area of required wetland, determine the size of turn-back horizontal flow wetland.

2, structure structure design

According to the specification sheets size that waterpower calculates, calculate the wetland foundation bearing capacity, the structure of design ornamental slab for paving the floor partition wall, last lower clapboard and outer pond stalk.

According to actual landform design wetland basis absolute altitude, consider water inlet, discharge structure form simultaneously.

3, capital construction

Three put through one level, Ground Treatment are carried out in the place.

According to the result of structure structure design, according to the construction wetland of constructing of form shown in accompanying drawing 1, accompanying drawing 2, the accompanying drawing 3, notice that main points are as follows: the height of 2 in (1) accompanying drawing 1 is 800mm, and 8 highly is 200mm; (2) 2 and 4 spacing distance 700mm-800mm in the accompanying drawing 1; (3) 13 gradient Fixed Design in the accompanying drawing 2 are 3%; (4) 21 width in the accompanying drawing 4 are that 100mm, the degree of depth are 50mm.

4, appurtenant work

Reach 80% maximum strength after capital construction is finished and to carry out WATER REPELLENT; WATER REPELLENT finishes can carry out the spoil disposal pipeline processing shown in the accompanying drawing 3 and install, and can carry out the processing and the installation of 6 draining headers in the accompanying drawing 1 simultaneously; Capital construction was finished after 28 days can load matrix, and matrix adopts after cleaning removes stone flour and argillous Wingdale centimetre stone, and particle diameter is 30mm-50mm; Matrix filling finishes and can plant vegetation, adopts parasol grass or Canna generalis Bailey as plant species, and plantation line-spacing 500mm, spacing in the rows 500mm, implantation time should select the local plant transplantation season of being fit to for use.

5, other

Introduce the suction culvert system, according to wetland operational management standardized operation, vegetation is gathered on time, sludge drainage system the wet land system commencement of commercial operation after 1 year every half a year carry out spoil disposal 1 time.

Claims

1. the horizontal-flow wetland feature of deflector type, lower clapboard carries out water conservancy diversion and changes matrix water flow inside fluidised form in the use, has realized horizontal water distribution, and baffling utilizes wetland substrate surface area and root system of plant surface-area fully up and down.

2. at the demand of deep purification of tail water of sewage plant, use the turn-back horizontal flow wetland technology as treatment process, and can obtain higher total phosphorus, nitrogen removal rate.This technology is connected use and is applied to the low concentration sewage processing with other technologies simultaneously.

3. use on the plants configuration be through than choosing back effect better, root system is comparatively flourishing and suitable horizontal-flow wetland in parasol grass and the Canna generalis Bailey planted, help nitrogen and phosphoric in the efficient absorption sewage.

4. the sludge drainage system in the wetland is the experience that basis wetland for many years designs and the implementation management experience is summed up out, well-designed and layout, its enforcement can be kept the normally operation all the year round of wetland, delays or prevents the aging of the obstruction of wetland hypothallus and wet land system.