Composite artificial wet land denitrifying and dephosphorizing method for living waste water vertical fluid-horizontal fluid

Abstract

The vertical flow of artificial humid land which is filled with cider including the much oxidation of Te, Ca, Si, Al and so on, is working in the way of interchange of dry and humid; The horizontal flow of artificial humid land which is filled with marble or limestone and cinder including Ca, is working continuously, but the partial untreatment waste water and flow into the 'C' source of horizontal flow of artificial humid land to improve its efficient of 'N' removal. The flower such as cannas, china rose, rose and chrysanthemum, can be planted in the vertical flow of artificial humid land, and vegetables such as leek, lettuce, cucumber, tomato arrowhead can be planted in the horizontal flow of artificial humid land.

Description

technical field [0001] The invention patent relates to sewage treatment technology. technical background [0002] The domestic sewage constructed wetland treatment methods mainly include vertical flow constructed wetland, horizontal flow constructed wetland and horizontal flow and vertical flow composite constructed wetland. [0003] The height of the vertical flow artificial wetland bed is more than 100cm, and finer substrates such as sand are usually used as the infiltration medium. The sewage is treated in the process of vertical infiltration from the surface downward, and most of the plants used are reeds and windmill grasses. , vetiver, regalia, sedge and canna etc. [0004] The height of the horizontal subsurface flow constructed wetland bed is about 60-80cm, and a relatively coarse substrate such as gravel is used as the treatment medium. The sewage flows horizontally under the surface of the constructed wetland, and large emergent plants wit...

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Problems solved by technology

[0006] The shortcomings are: (1) The horizontal flow constructed wetland has shortcomings such as insufficient aerobic conditions. Although it can remove SS well, it can also remove some BOD

At the same time, the phosphorus removal effect is also poor, generally only 30-40%, and the gravel matrix currently widely used has a short adsorption saturation life for phosphorus, generally 2 to 3 years; The treatment ability and nitrification ability of organic matter are strong, it has better aerobic conditions than horizontal flow artificial wetland, and it has better effect on BOD in wastewater 5 The removal effect of COD and COD is better, but the removal effect of SS is worse than that of horizontal flow constructed wetland; although it has a strong nitrification treatment ability for wastewater, its denitrification ability is also worse than that of horizontal flow constructed wetland, so it cannot Separately complete the nitrification and denitrification process of wastewater to achieve the purpose of wastewater denitrification treatment

At the same time, the phosphorus removal rate is only 40-50%, and the phosphorus removal life of sand and gravel matrix is ​​relatively short, generally 3-4 years

(3) Although the composite constructed wetland of horizontal flow and vertical flow can complete part of nitrification and denitrification of nitrogen, the removal rate of total nitrogen is not high, only 30-45%, and it is necessary to return the effluent of nitrification treatment, which increases power consumption , and with the increase of the reflux ratio, the amount of sewage treatment water is reduced, the floor area is increased, and the phosphorus removal rate is also reduced; secondly, the phosphorus removal effect of the horizontal flow artificial wetland using limestone, marble or dolomite matrix is ​​not high , is only 30-50%, which affects the phosphorus removal life of the composite constructed wetland, and economic crops such as vegetables cannot be grown on the horizontal flow constructed wetland; third, the aerobic treatment capacity and nitrification capacity of the vertical flow constructed wetland cannot be obtained Full play, occupying a larger area

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