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High-efficient circulating vertical flow constructed wetland and device suitable for sewage decentralized treatment

A constructed wetland, vertical flow technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of insufficient hydraulic gradient, low dissolved oxygen concentration, large specific surface area, etc. , to achieve the effect of strengthening the removal effect, increasing the dissolved oxygen, and increasing the concentration of dissolved oxygen

Inactive Publication Date: 2012-08-22
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low internal dissolved oxygen concentration and insufficient hydraulic gradient existing in traditional vertical flow constructed wetlands, the present invention develops a new type of circulating vertical flow constructed wetland equipment suitable for decentralized sewage treatment, which improves vertical flow For the concentration of dissolved oxygen inside the wetland, several kinds of fillers with large specific surface area, high porosity, good phosphorus adsorption effect and suitable for the growth of microorganisms and wetland plants were selected and matched, which strengthened the removal effect of the system on nitrogen, phosphorus and other pollutants

Method used

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  • High-efficient circulating vertical flow constructed wetland and device suitable for sewage decentralized treatment
  • High-efficient circulating vertical flow constructed wetland and device suitable for sewage decentralized treatment
  • High-efficient circulating vertical flow constructed wetland and device suitable for sewage decentralized treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Implementation example 1: Treatment of pig farm wastewater by intermittent operation of the system

[0025] The dimensions of the circulating vertical flow constructed wetland are: the size of the vertical flow constructed wetland bed in this test is 1m in length and width, 0.7m in height, and 700L in volume. The packing layer zeolite and expanded vermiculite are mixed in a ratio of 10:1, the height is 30cm, and the bottom gravel is 10cm. The length and width of the water storage tank are 1m each, the height is 0.3m, and the actual volume is 300L. The distance between the water storage tank and the constructed wetland pool is 10cm.

[0026] The swine wastewater used in the experiment is the effluent from a biogas tank, which is taken from a small pig farm and enters the system after sedimentation. The plants planted on the surface of the wetland are hybrid pennisetum. The system is intermittently fed with water, and the frequency of water intake and discharge is 2d / t...

Embodiment 2

[0032] Implementation example two: system continuous flow method to treat pig farm wastewater (reflux ratio is 5)

[0033]In this test, the size of the circulating vertical flow constructed wetland and the source of pig-raising wastewater are as in Example 1. At the same time, a strengthened adsorption column is added outside the pool of the vertical flow constructed wetland. The adsorption column is 0.8m high and 0.16m in inner diameter. The mixture of peat soil, the mixing volume ratio is 5:1. The operation mode adopts continuous flow. The sewage drips into the circulating water tank through the vertical flow artificial wetland, and then uses the pump to return the outlet water in the circulating water tank. Under the condition that the hydraulic load is 2cm / d and the reflux ratio is 5, the treatment effect of the equipment on pig farm wastewater is shown in Table 3 below.

[0034] Table 3 System continuous flow mode on the removal effect of pig farm wastewater (reflux rati...

Embodiment 3

[0037] Implementation example three: system continuous flow method to treat pig farm wastewater (reflux ratio 15)

[0038] The operating conditions of this implementation example are the same as those of implementation example 2, and the effluent reflux ratio is adjusted to 15. Table 4 shows the treatment effect of the system on pig farm wastewater when the reflux ratio is 15.

[0039] Table 4 system continuous flow mode to pig farm wastewater removal effect (reflux ratio 15)

[0040]

[0041] The results in Table 4 show that under the conditions of hydraulic load of 2 cm / d and reflux ratio of 15, the removal rates of COD, ammonia nitrogen and total phosphorus in swine wastewater can reach 84%, 99%, respectively. % and more than 91%, the effluent concentration is also far lower than the livestock and poultry raising discharge standards.

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Abstract

The invention belongs to the field of sewage ecological treatment, and the purpose is to provide a device and a method for sewage decentralized treatment in circulating vertical flow constructed wetlands. The invention comprises the following aspects: 1) the high-efficient circulating vertical flow constructed wetland system comprises three main components of a vertical flow constructed wetland, a circulating water tank, and a reinforced adsorption column; 2) the operation modes comprise an intermittent mode and a continuous mode. Fillers of the constructed wetland are proportional compositions of several fillers which are low in price and high in adsorption capacities for nitrogen and phosphorus; plants which have strong durability against pollution and have landscape value (thalia dealbata or day lily) or economic value (hybrid pennisetum) are planted on the wetland surface. The invention adopts the high-efficient filler composition to reinforce nitrogen and phosphorus adsorption; effluent backflow increases the dissolved oxygen inside the vertical flow constructed wetland, and enhances the nitration capability of microbes in the wetland; the denitrification capability is enhanced; the contact time of sewage and the fillers is increased; and the removal of phosphorus is enhanced. Series-parallel combinations can be selected flexibly with respect to different sewage types, and the applicability is strong.

Description

technical field [0001] The invention relates to the technical field of sewage land treatment methods and devices, in particular to domestic sewage treatment and sewage regeneration and reuse in scattered residential areas such as towns, mountainous areas, resorts, sanatoriums, residential quarters, and small towns. It can also be used in small-scale agriculture, animal husbandry and industrial wastewater treatment. Background technique [0002] At present, centralized sewage treatment is the main way of urban sewage treatment, but some decentralized sewage that cannot be collected into urban sewage pipe network or centralized treatment is not economical (residential living quarters, nursing homes, villa areas, resorts, relatively remote small and medium-sized Domestic sewage discharged from cities and towns, public building areas, rural areas and remote mountainous areas, and some small-scale pig farms, factories, etc.) If directly discharged into ponds, rivers, lakes, etc.,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 刘超翔高春芳刘琳董健
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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