KR100391937B1 - Water treatment system by high-rate oxidation pond with filamentous algae mat - Google Patents

Abstract

The present invention relates to a treatment system for sewage, small river and agricultural drainage in a decentralized rural village, and by installing a high speed oxidized land, an aquatic plant tank and an outflow control tank in which a filamentous algae mat is grown without a mechanical or civil treatment structure. The water treatment to remove nutrients of high efficiency is made.

The present invention is made by multiplying filamentous algae mat in an agitated fast oxidation paper maintained within a depth of 50 cm in the treatment of sewage, small river water and agricultural drainage, and arranging aquatic plant tanks and outflow control tanks before and after the high speed oxidation paper. The system can be simply installed using idle farmland or riverbeds.

Description

Water treatment system by high-rate oxidation pond with filamentous algae mat

In the present invention, in the treatment of small rivers and agricultural drainage in rural villages, rural sewage and small river waters are made without using special engineering structures and mechanical treatment structures, and utilizing idle agricultural lands such as rice fields as high-speed oxidation sites. It relates to the agricultural drainage treatment method.

In general, water treatment facilities require (1) removal of suspended solids, (2) removal of organic substances, (3) removal of nutrients, (4) ensuring microbiologically safe treatment water quality, and (5) toxic substances (including heavy metals). It is designed to achieve the goal of elimination of, and most are designed to achieve some of the above goals or the overall goal set out below.

Engineered processes with many mechanical factors are classified into primary treatment, secondary treatment and tertiary treatment according to the above treatment goals. For each of the last three decades, each unit process is formalized. There has been a lot of effort to make / arrangements, and in general, when treating municipal sewage, it is common to add additional unit processes to meet each treatment goal, but this requires a significant amount of finance.

However, in rural areas (Eup, Myeon, Lee), when they want to achieve some of the above treatment goals for water quality management in rural areas, they often have the resources to install expensive environmental foundations that are being constructed and operated in urban areas. There is a problem of procurement, which is not practical, and it is very difficult to introduce advanced treatment techniques for controlling nutrients which are relatively higher than organic concentration.

Recently, many artificial wetlands and oxidized geotechnologies using natural purification principles have been used to remove nitrogen and phosphorus contained in sewage, river water, and agricultural drainage. There are many difficulties to use.

The present invention has developed a treatment system for the removal of nutrients, which is particularly problematic in sewage, agricultural drainage, and small river water. Wherever possible, land requirements are smaller than existing natural treatment methods and mechanical elements for installation or mixing of civil structures Excluded and easy to maintain.

The present invention aims to control secondary pollution due to excess algae in the discharged water when using high speed oxidizing paper which has an excellent effect on removing pathogenic microorganisms as well as removing nutrients from sewage, polluted sewage or agricultural drainage in rural areas. In this way, the growth of filamentous algae in high-speed oxidized land is made very easy.

The present invention is made by installing an aquatic plant tank for the control of suspended solids and floating algae growth inhibition on the front end of the high-speed oxidation paper, and the outflow control tank (sedimentation tank) to prevent algae outflow at the rear end of the high-speed oxidation paper in the aquatic plant tank Planting floating plants such as duckweed to cover the entire water surface, and planting buttercups and water hyacinths in the outflow control tank to effectively control algae colonies leaked from the oxidized ground by roots and stems, while blocking sunlight. The additional growth of algae is suppressed to ensure the stability of treatment system effluent quality.

1 is a process chart of a filamentous algae mat ponds (FAMP), an aquatic plant basin (APB), an outflow control tank (ACB), and the like of the present invention.

2 and 3 are graphs of small river water and agricultural drainage treatment results treated by the present invention.

Figure 3 is a photograph showing the growth mode of filamentous algae in the fast oxidation paper (FAMP) of the present invention

[Description of symbols on the main parts of the drawings]

1. Filamentous algae mat oxidation paper 2. Aquatic plant tank 3 Outflow control tank

The water treatment of the present invention, after minimizing the effects of suspended solids and suppressing the growth of floating algae, as shown in Figure 1, after the sewage and agricultural drainage, small river water through the aquatic plant tank (1) through a fast oxidation paper (2) The spill control tank 3 is intended to be installed in rural areas, particularly in distributed villages, without significant financial support. The present invention provides sewage and small rivers in the treatment of domestic sewage and small rivers and agricultural drainage. Inflow and treatment of water and agricultural drainage to the aquatic plant tank (1) for removal of suspended solids and suppression of floating algae, and sewage, small river water, and agricultural drainage stayed in the aquatic plant tank (1) for a certain time. Inflow treatment of the filamentous algae into high-speed oxidation paper (2: or high-efficiency oxidation paper) in which the mattress is formed, and the treated water treated in the high-speed oxidation paper (2) flows into the outflow control tank (3). It is made by discharge after preventing the algae outflow, the present invention will be described in detail based on the following examples.

Example. One

As a result of treatment experiments using contaminated river water and agricultural drainage, each process constituting the present invention was found to perform the following functions and roles.

Aquatic Plant (APB) Filamentous Algal Oxide Paper (FAMP) Outflow Control Tank (FAMCB) For aquatic plants, the side plants that completely cover the surface of the water, such as frog rice, are suitable. Floating substances in the inflow water are attached or precipitated by the roots of aquatic plants.Inhibiting floating algae by blocking sunlight. Harvest / Reuse Proliferation of filamentous algae, predominant species of spirogyra sp. Elimination of dissolved phosphorus / nitrogen by algae synthesis. Killing effect of pathogenic microorganisms due to high pH conditions. Chemical precipitation of phosphate due to high pH. Maintain sufficient exhalation in the system. Aquatic plants are suitable for planting buttercups and water hyacinths. Chemical stability of effluents by adjusting the elevated pH with precipitation and removal of adherent algae.

Example. 2

Using the treatment system of the present invention, TN 3-9 mg / L, TP 0.3-0.7 mg /, which is the level of contaminated river water or agricultural drainage, in the water treatment experiment of distributed village sewage and small river and agricultural drainage. As shown in FIG. 2, the treated water quality at the hydraulic retention time of 4-5 days was TN 0.67 mg / L and TP 0.068 mg / L.

The nutrient removal efficiencies of the whole treatment system were T-N 89.3% and T-P 85.8%, and the efficiency in FAMP was T-N 88.1% and T-P 80.4%.

In particular, the treatment water quality could be kept below eutrophication criteria without the need for additional carbon sources, which are often required in engineering treatment facilities for the treatment of nutrients, and no special power source or management personnel were needed.

On the other hand, in winter, when the temperature is lowered, the stability of the treatment is greatly improved when the system is warmed or a vinyl house is installed to prevent the temperature decrease.

In addition, when the system of the present invention is applied to the site, the relationship between the hydraulic retention time (HRT), the water temperature (Temp.), PH, TN, and TP through the test operation results as shown in FIG. The proper operating conditions can be found by analyzing.

Example. 3

The growth of filamentous algae, a major function of the present water treatment system, allows the entire system to maintain complete aerobic conditions. Oxygen bubbles generated through photosynthetic activity during the day as the filamentous algae group formed a mat were captured in the algae mat as shown in FIG. 4.

The principle of high speed oxidizing paper, which has been developed previously, is mainly installing mechanical stirring facilities to prevent algae synthesis and prevent anoxic conditions due to breathing at night. However, in the water treatment system of the present invention, the oxygen supply trapped in the algae mat does not occur at night, so no mechanical mixing is necessary, so the present invention system is designed without stirring.

In addition, since filamentous algae form mats, algae outflow (secondary pollution) is hardly found in the fast oxidation sheet (2), and the filamentous algae group that overproliferates in the fast oxidation sheet (2) starts to brown. Finally, the elimination of Young-Yam salts is completed by recovering from the mat. The recovery time of the mat is suitable every three to four weeks, and the recovery operation can be easily performed by manpower using a rake.

VS content in recovered algae biomass is about 88%, which is suitable for recycling such as composting of algae due to high organic content.

In addition, the filamentous algae group had 37.7 mg _rem. N / d · m 2, 31.2 mg _rem. The nutrient absorption capacity of the filamentous algae group, which is calculated as P / d · m 2, applied to the system of the present invention, is much greater than the effect of aquatic plants such as duckweed, water hyacinth, and parsley.

The present invention is a system for removing nutrients from sewage, polluted sewage and agricultural drainage in rural areas. In the absence of financial support, the present invention provides high removal efficiency of nutrients even if eliminating mechanical elements or civil structures. You can get it.

In addition, the treatment site according to the present invention can also be easily installed in a decentralized rural village by utilizing idle farmland (mainly paddy fields), riverbeds, and reservoir floodplain, and because the treated water quality is generated below the eutrophication standard, it is very useful for the management of agricultural water sources. It is suitable.

Claims (2)

In the treatment of domestic sewage and small river water, agricultural drainage, the step of treating the sewage and small river water, agricultural drainage into the aquatic plant tank (1) for the removal of suspended substances and suppressing the growth of floating algae; Inflowing and treating the sewage, small river water, and agricultural drainage in the aquatic plant tank (1) into a fast oxidation paper (2) where the filamentous algae are grown and mattressed; Rural type river water, agricultural drainage treatment method using filamentous algae mat oxidized paper, characterized in that the treated water from the high-speed oxidizing paper (2) flows into the outflow control tank (3) to prevent algae outflow. The method of claim 1, wherein the fast oxidation paper 2 uses filamentous algae to form a filamentous algae mat to prevent secondary contamination due to algae spillage, and at the same time, it is operated in an agitated manner. Rural small river water, agricultural drainage treatment method.