CN1631817A - Integrated anaerobic-wetland wastewater treatment device and method - Google Patents

Abstract

The invention belongs to waste water processing field, which is mainly used for waste water procession of living, animal breeding and industry, includes underground anaerobe processing system and man damp zone processing system above it. The main steps are: the waste water passes through the holes of water feeding room and enters into anaerobe digestion pool after crossing 3 ; then it enters into anaerobe filtration pool in which is flexible or softer filler; it enters into 2- 4 filtration pool; through the holes above the 2 - 4 filtration pool, it enters into the man damp zone to be processed; marsh gas generated is stored in the upper parts of anaerobe digestion pool and anaerobe filtration pool, in the course of anaerobe generating and being used, the man damp zone is in the condition of dry and damp which replacing each other, with the antinitration / antinitrosation effect. The device has the following advantages: no need for energy, low cost for operation management, little mud, convenient operation management, easy to be maintained, marsh gas as energy can be recycled and no need for single device for storing marsh gas.

Description

Integrated anaerobic-wetland wastewater treatment device and method

Technical Field The present invention belongs to the field of environmental engineering wastewater treatment, and is mainly used for domestic sewage treatment, livestock and poultry breeding wastewater treatment and industrial wastewater treatment.

Background technology To sum up, wastewater treatment includes physical treatment, chemical treatment, physicochemical treatment and biological treatment. Physical treatment is only used to remove coarse solids and is mainly used for pretreatment. The remaining three treatment methods are used to remove dissolved and colloidal organic matter, among which biological treatment is the most economical and effective method, widely used in the treatment of industrial organic wastewater and urban domestic sewage. Biological treatment includes anaerobic treatment, aerobic treatment and natural treatment, etc., each has its own strengths. Anaerobic treatment directly treats high-concentration organic wastewater with low energy consumption, but the concentration of organic matter in the effluent is high; the concentration of organic matter in the effluent treated by aerobic treatment is low. However, the energy consumption is high; the effluent concentration of natural treatment is low, especially for the removal of nitrogen and phosphorus, but it occupies a large area. Based on the advantages of anaerobic treatment and natural treatment, the invention avoids the disadvantage of natural treatment occupying a large area, and develops an integrated anaerobic treatment-constructed wetland wastewater treatment device and method.

Summary of the invention The present invention builds the anaerobic treatment system underground, and builds a constructed wetland on top of the anaerobic treatment system, so that the buried anaerobic treatment system and the constructed wetland treatment system are integrated. Wastewater enters the buried anaerobic treatment system after passing through the grid, and after being treated by the buried anaerobic treatment system, it enters the constructed wetland at the top of the anaerobic treatment system for further treatment. The anaerobic treatment system includes grille, baffled anaerobic digester, baffled anaerobic filter and baffled facultative filter. The generated biogas is stored in the upper part of the anaerobic digester and anaerobic filter. When biogas is produced, the biogas presses the wastewater from the anaerobic digester and anaerobic filter to the hydraulic pressure room, facultative filter and artificial wetland; when using biogas, the wastewater from the hydraulic pressure room, facultative filter and artificial wetland flows into Anaerobic digester, anaerobic filter. During the alternating process of biogas production and use, the constructed wetland is in an alternating state of dryness and wetness, with nitrification-denitrification effects. The wastewater treatment device and method of the present invention have the following advantages:

a It can be disposed of nearby and discharged nearby;

b No energy consumption, low operation and management costs;

c less sludge;

d Convenient operation and management, no special management is required, and easy maintenance;

e can recover energy - biogas;

f There is no need to build a biogas storage device separately.

Description of the drawings The attached drawing is a schematic diagram of an integrated anaerobic-wetland wastewater treatment device. The wastewater treatment steps are as follows:

a The waste water passes through the grid 1 first to intercept solid substances such as coarse residues, and the grid well can also be used as a grit chamber.

b. After passing through the grille, the waste water enters the anaerobic digester 3 through the water distribution hole in the water inlet room 2, and the water inlet room is also a hydraulic pressure room. The role of the anaerobic digestion tank is to separate the granular inorganic and organic matter and parasite eggs in the wastewater, remove most of the suspended matter, reduce the concentration of suspended matter entering the anaerobic filter, precipitated solid organic matter and partially dissolved and colloidal organic matter are anaerobically fermented in the anaerobic digester to produce biogas.

c The wastewater treated by the anaerobic digester enters the anaerobic filter 4, and the elastic filler or soft filler 5 is set in the anaerobic filter to attach microorganisms, and its function is to use the attached and suspended microorganisms to degrade and remove most of the dissolved organic pollutants , and produce biogas.

d. The waste water treated by the anaerobic filter enters the facultative filter 6, and the filter material 7 is arranged in the facultative filter. The filter material can be polyurethane foam, and the facultative filter has ventilation gaps, and the function is to retain solid matter. Facultative bacteria decompose and remove organic pollutants.

Both the anaerobic digester and the anaerobic filter are sealed, and inspection manholes, movable covers and biogas conduits 8 are set. Open the movable cover of the manhole to pump out the sludge and carry out inspection and maintenance on the anaerobic digester and anaerobic filter.

e The waste water treated by the facultative filter enters the constructed wetland 10 through the overflow hole 9 above the facultative filter. In the artificial wetland, lay a layer of limestone or carbon flower 11 with a thickness of 30-60 cm and a particle size of 0.5-3 cm. The water level of the wastewater should be just submerged in the limestone or carbon flower. Plant aquatic plants such as water peanuts 12 on the limestone or carbon flower. Build a wetland similar to a swamp. When the eutrophic waste water flows through the artificial wetland, it is filtered by limestone and carbon flowers, and various microorganisms in the rhizosphere of the plant are active. The pollutants and nutrients in it are absorbed or decomposed by the system to achieve The closed cycle of nutrients purifies the water quality.

According to the effluent requirements, the wastewater treated by the constructed wetland on top of the anaerobic treatment system can be further treated by the oxidation pond or constructed wetland.

Claims (5)

1 one kinds of apparatus and method that are used for wastewater treatment, by buried system for anaerobic treatment with artificial wet land treating system is integrated forms, be characterised in that: waste water enters buried system for anaerobic treatment through behind the grid, enters the artificial swamp that is positioned at the system for anaerobic treatment top and further handle after described buried system for anaerobic treatment is handled.

2 wastewater treatment equipment according to claim 1 and methods is characterized in that: buried system for anaerobic treatment comprises anaerobic digester, anaerobic filter, water pressure house and double oxygen filter tank, wherein anaerobic digester, anaerobic filter sealing; Water pressure house and double oxygen filter tank communicate with atmosphere.

3 wastewater treatment equipment according to claim 1 and methods is characterized in that: artificial swamp is positioned at the system for anaerobic treatment top, and artificial swamp is a filler with Wingdale, carbon slag, and planting aquatic plants.

4 wastewater treatment equipment according to claim 1 and methods, it is characterized in that: the biogas of generation is stored in the top of anaerobic digester and anaerobic filter, when producing biogas, biogas presses waste water in anaerobic digester, the anaerobic filter toward water pressure house, facultative filter tank and artificial swamp; When using biogas, the waste water of water pressure house, facultative filter tank and artificial swamp flows into anaerobic digester, anaerobic filter.

5 wastewater treatment equipment according to claim 4 and methods is characterized in that: in the alternation procedure that produces, uses at biogas, artificial swamp is in the alternation of wetting and drying state, has nitrated-denitrification effect.

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