KR100397606B1 - Wastewater treatment process and method using the Inorganic-coagulant and Bio-filter - Google Patents

Abstract

The present invention relates to a water treatment method and apparatus using an inorganic coagulant and a biofilm filtration tank, and is a process for removing phosphorus, nitrogen, and residual organic matter in the water to be treated (100). The configuration of the process is composed of the inflow of the object water 100, the denitrification biofilm filtration tank 102, the aerobic biofilm filtration tank 103, the treatment water tank 104, the inorganic coagulant 101 of the aerobic biofilm filtration tank 103 It is divided into a method of injecting into the inlet and a method of injecting the inorganic coagulant 101 into the inlet to the denitrification biofilm reactor (102). The conventional process for removing phosphorus is to inject the inorganic coagulant and the polymer coagulant into solid-liquid separation through the precipitation device after rapid and slow stirring. Phosphorus captured by the biofilm filtration tanks 102 and 103 is transferred to the pretreatment facility through backwashing. The treated water that has undergone the biofilm filtration tank is discharged 105 after being temporarily stored in the treated water tank 104. The process is a highly advanced process to remove phosphorus, nitrogen, turbidity and residual organics can be used for heavy water applications.

Description

Wastewater treatment process and method using the Inorganic-coagulant and Bio-filter}

The present invention relates to a water treatment method and apparatus using an inorganic coagulant and a biofilm filtration tank. The present invention is shown in detail in the prior art No. 030468, which uses a part of the bio-filter system (Bio-filter) system, and in the prior patent publication No. 10-1999-0068787 of the present invention, Bio-filter was shown. In addition, Korean Patent Publication No. 10-2001-0026410 describes a technique for removing nitrogen from an upflow desulfurization reactor after removing phosphorus by solid and liquid separation due to a flocculation settling device, and performing nitrification and denitrification in a single reactor. Described. However, in the form of treatment, in the upflow type, finely divided sulfur particles may leak and increase the chemical oxygen demand (COD) and the suspended solids (SS). In addition, it is difficult to backwash as the nitrification zone and the denitrification zone are separated in the upflow single reactor. Phosphorus removal through chemical treatment can increase phosphorus removal efficiency by adding a polymer coagulant and using a slow stirring tank and a precipitation tank. Japanese Patent Application Laid-open No. Hei 6-182393 describes the removal of nitrogen by using sulfur particles as a fluidized bed under anoxic conditions in an upstream flow, and internal transport was performed to prevent the fine sulfur particles from leaking out. The high dissolved oxygen (DO) in the sulfur reactor is described as the denitrification microorganism activity is reduced, the nitrogen removal efficiency is described. In addition, in the case of Publication No. 2001-00055891, a denitrification reactor is installed at the rear of the final settler to remove nitrogen, but residual organic matter and turbidity cannot be removed. You cannot take first aid if you leave.

Therefore, in order to improve the conventional technology, the present invention is introduced only into the inorganic coagulant 101 such as aluminum salt, iron salt, etc. at the inlet of the aerobic biofilm filtration tank 103 or the denitrification biofilm filtration tank 102 to be captured by biological filtration. The emphasis was on removing phosphorus. In particular, unlike the method of using a rapid stirring, slow stirring and precipitation device by injecting the conventional inorganic coagulant (101) and polymer coagulant to remove the phosphorus using only the inorganic coagulant (101). As a result, the chemical cost can be reduced by not adding the polymer coagulant, and the power cost and the required site can be reduced because the slow stirring tank and the sedimentation tank are not used. In addition, by installing the aerobic biofilm filtration tank 103 at the rear end of the denitrifying microorganism filtration tank 102 to prevent the deterioration of the treated water quality due to the outflow of fine sulfur particles and to maintain a stable treated water quality. The characteristic of the bio-filter is that the microorganisms are attached to the filled media to form a biofilm, thereby expanding the microbial habitat space and maintaining a high concentration of microorganisms. As a result, the treatment time is shortened compared to the floating growth type, that is, activated sludge method, and has the characteristics of making stable and clean treated water quality. Therefore, this invention is the process which improved further the above-mentioned prior patent process.

1 is a water treatment system diagram of a reactor used in the present invention.

<Description of the code>

100: water to be treated, 101: inorganic coagulant, 102: denitrifying biofilm filtration tank,

103: aerobic biofilm filtration tank, 104: treatment tank, 105: discharge, 106: backwash drainage

In order to achieve the above-described purpose, in connection with FIG. 1, the inorganic coagulant 101 may be introduced into the aerobic biofilm filtration tank 103 or the inorganic coagulant 101 may be desulfurized biofilm filtration tank. 102) After entering the inlet to capture the phosphorus to remove nitrogen from the downflow fixed bed desulfurization biofilm filtration tank 102, remove the residual organic matter and turbidity in the aerobic biofilm filtration tank 103, and then temporarily stored in the treatment tank (104) Discharge 105. At this time, the denitrification biofilm filtration tank 102 may be supplied with an alkaline agent such as sodium carbonate for nitrogen removal. In addition, when filtration resistance is generated due to accumulation of fine flocs and microorganism growth, backwashing is performed after backwashing the denitrifying biofilm filtration tank 102 and the aerobic biofilm filtration tank 103 with air (A) and treated water. Drainage 106 is transferred to a pretreatment facility (precipitator, inflow water tank, etc.). The aerobic biofilm filtration tank 103 may maintain a stable water quality by performing a role of a safety plate when microorganisms are detached due to an external impact due to toxicity to the denitrifying biofilm filtration tank. The present invention is a system without a slow stirring tank and a settling tank because the biofilm filtration tanks 102 and 103 are used.

The present invention removes phosphorus, nitrogen, turbidity and residual organics of the water 100 to be treated, so that the treated water can be used in various fields. In addition, by using a bio-filter, the system can be simplified by eliminating the need for a slow stirring tank and a precipitation device for phosphorus removal. The treated water treated with the present invention can be used for heavy water such as industrial water, landscaping water, toilet water, and also by supplying clean treated water that can inhabit fish and aquatic plants to dry streams due to urban development. It will contribute to the creation of environment-friendly ecological space.

Claims (3)

To the aerobic biofilm filtration tank (103) filled with a denitrified biofilm filtration tank (102) in which the treated water is introduced to remove nitrate nitrogen, and a hydrophilic filter medium which is discharged by removing residual organic matter and turbidity connected to the rear end of the denitrification biofilm filtration tank. It is configured, the water treatment device characterized in that the inlet is provided so that the inorganic coagulant to the desulfurization biofilm filtration tank or the aerobic biofilm filtration tank In the water treatment method of the water to be treated containing a large amount of nitrate nitrogen and phosphorus, only the water to be treated is introduced into the denitrification biofilm filtration tank, or the inorganic coagulant is added to the water to be treated with stirring to denitrate. Nitrate nitrogen is removed by entering the biofilm filtration tank, and then only the treated water is introduced into the aerobic biofilm filtration tank, or the inorganic coagulant is added to the treated water with agitation and introduced into the aerobic biofilm filtration tank to remove residual organic matter and turbidity. And then discharged. delete