KR20230114425A - Purifying method of Non-biodegradable Organic Wastewater based on High speed Biological and physiochemical apparatus - Google Patents

Abstract

In the purification method of non-degradable organic wastewater according to an embodiment of the present invention, the first filtration step (S1), the second filtration step (S2), the oxidation process step (S3), the biological treatment step (S4), and the tertiary filtration step It includes a step (S5), and in the first filtration step (S1), the wastewater composed of non-degradable organic substances is physically treated with filter yarns composed of several layers to filter out foreign substances, and in the second filtration step (S2), the hollow fiber membrane The effluent suitable for the final environmental standard is released by passing through a filtration membrane composed of a reverse osmosis membrane and a reverse osmosis membrane in several stages, and in the oxidation process step (S3), a biological and chemical reaction occurs through an electrochemical oxidation process of the concentrated recalcitrant organic matter caught in the filtration membrane In the biological treatment step (S4), biological degradation occurs through a high-temperature and high-speed biological treatment tank for wastewater containing non-degradable organic matter treated in the oxidation process step (S3), and the tertiary filtration step (S5) As a method of purifying wastewater treated in the biological treatment step (S4) through a physical treatment step composed of filter sand, an object of the present invention is to provide a process capable of efficiently and stably treating high-concentration recalcitrant organic wastewater. It relates to a non-degradable organic wastewater purification method that can reduce operating costs and reduce installation area compared to conventional physicochemical treatment methods.

Description

Efficient purification method of non-biodegradable organic wastewater based on high speed biological and physiochemical apparatus

The present invention is a purification system for non-degradable organic wastewater, and more specifically, filters out foreign substances through physical treatment, and sends concentrated non-degradable organic matter through a sieve composed of a hollow fiber membrane and a reverse osmosis membrane to an electrochemical oxidation process step. It relates to a method for efficiently purifying non-degradable organic wastewater through biological degradation by sending it to a high-temperature and high-speed biological treatment tank.

Human civilization advances. As industrialization progresses, each technological field develops rapidly, enabling it to overcome the limitations of time and space, and the cultural and cultural aspects of mankind. It is true that technological development has the advantage of greatly improving the standard of human living, but has negative effects on the environment and ecosystem.

In addition, as the quality of human life increases, the use of water, which is essential for humans, becomes industrial. There is no choice but to increase in various aspects of life, and as a result of using such water, wastewater increases, and recovering it again is emerging as an important technical task. In particular, environmental pollution problems, air pollution problems, and water pollution problems are Various methods are provided to provide a solution to .

Non-degradable organic wastewater is not only time-consuming and expensive to treat even if biological treatment methods are used, and the same problem occurs even if it is treated with chemical methods. It also requires a large space for processing.

In particular, in the case of water pollution, it not only threatens the ecosystem by causing enormous damage to the survival of animals and plants, but also seriously threatens human health. process or catalytic oxidation process.

In addition, as prior art of the Korean Intellectual Property Office in relation to a device for treating high-concentration recalcitrant wastewater, 1) Republic of Korea Utility Model Registration No. 20-0281730 "High-concentration recalcitrant wastewater treatment device" is It is purified through physical treatment and chemical treatment with an oxidizing agent, a base agent, and a coagulant, and direct and concentrated impact is applied to the wastewater through a concentrated blow reaction tank to facilitate solid-liquid separation and degassing. As such, It uses physical force by stirring and aeration. In addition, 2) Republic of Korea Patent No. 10-1336875 “high flux membrane filtration wastewater treatment device and treatment method using initial membrane fouling control” relates to a wastewater treatment device and treatment method, effectively removing membrane fouling components at the beginning of membrane fouling A membrane filtration activated sludge device equipped with a submerged membrane and a wastewater treatment device including a filtration backwash device are disclosed for operation of membrane filtration with high flux above the critical flux by removing the membrane, and 3) Republic of Korea Patent No. 10-1336875 "Advanced wastewater and sewage treatment system" repeatedly or selectively creates an anaerobic environment and an aerobic environment from inflow sewage, inducing decomposition of organic matter, nitrification reaction and phosphorus release, as well as biofilm filter media. Disclosed is a method for providing water quality as suitable heavy water by removing recalcitrant organic matter.

In the present invention, for the purification of non-degradable organic wastewater, it is subjected to physical treatment consisting of filter yarns composed of several stages to filter out coarse foreign substances, discharges effluent suitable for the final environmental standard through hollow fiber membranes and reverse osmosis membranes, and concentrates non-degradable organic matter It relates to a purification method through high-temperature and high-speed biological decomposition after sending to the electrochemical oxidation process step so that biological and chemical reactions occur well.

1. Registered Utility Model No. 20-0281730 (Announcement date: 2002.06.28.) 2. Registered Patent No. 10-1005422 (Announcement date: 2010.12.30.) 3. Registered Patent No. 10-1336875 (Announcement date: 2013.12.04.)

Non-degradable organic wastewater is not only time-consuming and expensive to treat even if biological treatment methods are used, and the same problem occurs even if it is treated with chemical methods. It also requires a large space for processing.

The present invention was invented to solve the above problems, and an object of the present invention is to provide a process capable of efficiently and stably treating high-concentration recalcitrant organic wastewater.

In addition, it is to reduce the operating cost and reduce the installation area compared to the existing physicochemical treatment method.

The purification method of recalcitrant organic wastewater through biological treatment and physicochemical treatment according to the present invention includes a first filtration step (S1), a second filtration step (S2), an oxidation process step (S3), and a biological treatment step (S4). And it may include a tertiary filtration step (S5).

It may include a primary filtration step (S1) of filtering foreign substances through physical treatment consisting of filter yarns composed of several layers of wastewater composed of non-decomposable organic matter.

A secondary filtration step (S2) of passing effluent suitable for the final environmental standard by passing through a sieve composed of a hollow fiber membrane and a reverse osmosis membrane in several stages may be included.

In addition, an oxidation process step (S3) of biologically and chemically reacting the non-decomposable organic matter concentrated in the filter through an electrochemical oxidation process may be included.

In addition, a biological treatment step (S4) may be included in which the wastewater containing the non-degradable organic matter treated in the oxidation process step (S3) is biologically decomposed through a high-temperature and high-speed biological treatment tank.

In addition, a tertiary filtration step (S5) may be included to purify the wastewater treated in the biological treatment step (S4) again through a physical treatment step composed of filter sand.

In addition, the filter yarn may be characterized in that it is a PVDF separation having a filtration function of 0.001 mm to 0.005 mm as a submerged separator.

In the secondary filtration step (S2), the hollow fiber membrane and the reverse osmosis membrane have a basic structure of a hollow fiber membrane and a reverse osmosis membrane, several of one structure are connected in parallel, and ultrasonic waves having a length corresponding to the distance between the membranes It may be characterized in that it includes an ultrasonic generator so that a standing wave of is generated between the two membranes.

The oxidation process step (S3) includes a DAS electrode, maintains the concentration through an acid (non-reducing acid) that is difficult to reduce, and electrolyzes a mixed solution of wastewater and non-reducing acid composed of recalcitrant organic matter. can be done with

The biological treatment step (S4) is aerobic. It may be characterized in that it includes a biological treatment device including acidophilic strains and composed of porous inorganic ceramics.

The tertiary filtration step (S5) may be characterized in that it has a structure that increases energy efficiency by allowing heat exchange with wastewater composed of non-decomposable organic matter to pass through several stages of filter sand.

In addition, the treatment tank equipped with filter yarns may be characterized in that mechanical vibration is sent to the filter yarns at appropriate intervals so that pores between the filter yarns are not clogged, and the flow of fluid passing through the filter yarns is monitored.

The present invention has the effect of efficiently and stably treating wastewater compared to conventional methods for purifying non-degradable organic wastewater.

In addition, it has the effect of reducing operating costs and reducing installation area compared to existing physicochemical treatment methods.

1 is a flowchart of the entire process of the recalcitrant organic wastewater purification method of the present invention.

Hereinafter, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, the numbers used in the description process of this specification are only identifiers for distinguishing one component from another component.

In addition, the terms used in this specification and claims should not be construed as limited in a dictionary sense, and based on the principle that the inventor can properly define the concept of terms in order to best explain his/her invention, It should be interpreted as meaning and concept consistent with the technical spirit of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are only preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention, so various equivalents that can replace them at the time of this application It should be understood that water and variations may exist.

A preferred embodiment of the present invention will be described in more detail, but technical parts that have already been well-known will be omitted or condensed for conciseness of description.

General non-degradable organic wastewater treatment mainly uses a physicochemical treatment process, but according to the existing treatment method, secondary pollution problems and unstable treated water quality may occur due to the input of a large amount of chemicals and the generation of sludge.

As shown in FIG. 1, the present invention includes a primary filtration step (S1), a secondary filtration step (S2), an oxidation process step (S3), a biological treatment step (S4) and a tertiary filtration step (S5).

Each organic wastewater purification method in the present invention is as follows.

In the first filtration step (S1), wastewater composed of non-degradable organic matter is filtered out through physical treatment consisting of filter yarns composed of several layers.

In the secondary filtration step (S2), effluent suitable for the final environmental standard is discharged by passing through several stages through a filtration membrane composed of a hollow fiber membrane and a reverse osmosis membrane.

In the oxidation process step (S3), biological and chemical reactions occur well through an electrochemical oxidation process of the concentrated non-decomposable organic matter caught in the sieve.

In the biological treatment step (S4), the wastewater containing the non-decomposable organic matter treated in the oxidation process step (S3) is subjected to high-temperature and high-speed biological treatment tank so that biological degradation occurs.

In the tertiary filtration step (S5), the wastewater treated in the biological treatment step (S4) is purified again through a physical treatment step composed of filter sand.

<Example 1>

The recalcitrant organic wastewater purification method for carrying out the present invention includes a first filtration step (S1), a second filtration step (S2), an oxidation process step (S3), a biological treatment step (S4) and a third filtration step (S5). includes

1. Primary filtration step (S1)

In the first filtration step (S1), wastewater composed of non-degradable organic matter is filtered out through physical treatment consisting of filter yarns composed of several layers.

At this time, the filter sand is aerobic for biological treatment. Acidophilic strains may be attached. This strain will assist in the decomposition of organic wastewater.

In the primary filtration step (S1), various industrial or household wastewater (10) is introduced.

At this time, since the organic wastewater contains various contaminants and flows in, in the existing wastewater treatment system, the incoming raw water is once collected in a collecting tank and then mixed with a coagulant in a mixing tank, or A step of coagulating organic materials and the like is required.

However, unlike conventional wastewater treatment devices, the wastewater treatment system of the present invention does not require the use of chemicals such as coagulants, so a separate chemical injection is unnecessary.

The filter yarn in the present invention is a submerged separation membrane and removes particulate matter present in wastewater flowing into a PVDF membrane having a filtration function of 0.001 mm to 0.005 mm.

2. Secondary filtration step (S2)

In the secondary filtration step (S2), discharged water suitable for the final environmental standard is released by passing through several stages through a filtration membrane composed of a hollow fiber membrane and a reverse osmosis membrane.

The hollow fiber membrane and the reverse osmosis membrane have a basic structure of a hollow fiber membrane and a reverse osmosis membrane, and one structure is connected in parallel to adjust the flow rate as needed, and the inlet is connected to the outlet of the primary filtration step (S1), The outlet consists of discharged water and concentrated water.

The pores of the hollow fiber membrane and the reverse osmosis membrane at this stage may gradually become clogged as the filtering process progresses. A device for minimizing clogging of the pores of the reverse osmosis membrane and the hollow fiber membrane by periodically shaking the membrane with ultrasonic waves in connection with the output of the device may be added.

In addition, it has a structure to exchange heat with each treatment stage so that only the minimum energy of the biological treatment tank is used, temperature control uses PID, and through data accumulation by the result of continuous operation, it is appropriate to analyze the required input energy. Algorithms are meant to be used.

Each processing stage is designed to measure temperature, flow rate, and pH in real time, and the measured data is recorded in a data logger. Each stage has a valve that can separate each stage independently to enable continuous operation or batch operation if necessary, all of which can be adjusted through an automated sequence.

Driving conditions and measurement data can be transmitted to a central control unit or personal terminal (eg mobile phone) via wireless or wired Internet.

Concentrated water enters the reaction tank of the oxidation process step (S3).

3. Oxidation process step (S3)

In the oxidation process step (S3), biological and chemical reactions occur well through the electrochemical oxidation process of the concentrated water containing the recalcitrant organic matter that is filtered and concentrated in the sieve.

In order to electrically activate non-degradable organic matter in an electrochemical manner, a DAS electrode is used and an appropriate amount of an acid that is difficult to reduce is added during electrolysis of wastewater to maintain an appropriate concentration, and wastewater composed of non-degradable organic matter Oxygen and hydrogen are generated by electrolysis of a mixed solution of and this non-reducing acid. The oxygen atoms generated at the electrode moderately oxidize the non-decomposable organic matter in the solution to improve reactivity, thereby facilitating biological treatment. The pH of the acid added here is limited to a range that does not affect the biological treatment to be applied in the next step.

The electrodes of the electrochemical reaction tank at this stage have a network structure and have a large surface area so that the reaction with the chemical species in the liquid occurs as well as possible. The number can be greatly increased in a parallel structure as needed, such as the capacity of the number of processes.

For the cathode, a metal that is not easily corroded by acid, other than the DAS electrode, may be used, and a non-porous or network structure may be used.

As for the type of voltage applied to the electrode, pulse is the best for wastewater treatment efficiency, but 60Hz can be half-wave rectified in consideration of the reliability and durability of the device.

The magnitude of the voltage can be determined by on-site testing according to the type of non-decomposable organic matter to be treated, the type of acid used, and the pH.

In order to adjust the size of the voltage, the voltage may be adjusted mechanically using slalidax in consideration of durability, or may be adjusted electronically by configuring an automated system.

A relay or SSR synchronized with the frequency of the commercial power used can be used to make the shape of the half-wave more pulse-like. In this case, a separate circuit for timing is required, and it can be controlled manually or electronically through an automated loop.

A voltage of 20V or less may be used as the voltage applied to the electrode, or a high voltage of 20V or more may be used by installing an additional stage of the electrochemical treatment stage according to the type of organic matter to be treated. When using a high voltage, a plasma reaction in a liquid can be used.

An optical turbidity meter can be installed to observe the turbidity of the wastewater at each stage of the treatment tank, and through this, it can be referred to as the total concentration of organic matter in the wastewater to be treated.

There is an inlet through which acid can be injected if necessary to adjust the pH of the entire system, and a device for automatically adjusting it according to the measured pH may be provided.

At this time, the treated concentrated water is sent to the biological treatment step (S4).

4. Biological treatment step (S4)

In the biological treatment step (S4), the wastewater containing the non-decomposable organic matter treated in the oxidation process step (S3) is subjected to high-temperature and high-speed biological treatment tank so that biological degradation occurs.

This reactor is aerobic. It is a biological treatment device containing acidophilic strains and filled with porous inorganic ceramics. The porous nature of the ceramics is used to maximize the surface area on which the strains act.

The biological reactor is maintained in a warm state and is equipped with a temperature control device so that biological treatment can occur well even in winter when the temperature is low.

In addition, in the biological treatment step (S4), an air supply device is provided to sufficiently supply oxygen, and a device for supplying the required amount of air by calculating the amount of oxygen required based on the measured concentration of organic matter may be included. .

5. Third filtration step (S5)

In the tertiary filtration step (S5), the wastewater treated in the biological treatment step (S4) is purified again through a physical treatment step composed of filter sand.

The final effluent is structured to increase energy efficiency by allowing heat exchange with wastewater composed of recalcitrant organic materials to pass through several stages of filtering yarns.

In the processing tank equipped with filter yarns, mechanical vibration is sent to the filter yarns at appropriate intervals so that the pores between the filters are not clogged, and the flow of the fluid passing through the filters is monitored to determine the degree of clogging of the pores of the filters. A configuration for automatically applying mechanical vibration to the filtering yarn based on monitoring may be included.

As such, the wastewater treatment process can be simplified in terms of space or efficiency by the method for purifying non-degradable organic wastewater using the biological and physicochemical methods of the present invention.

As described above, the detailed description of the present invention has been made by way of examples, but since the above-described embodiments have only been described with a preferred example of the present invention, it is understood that the present invention is limited only to the above embodiments. It should not be lost, and the scope of the present invention should be understood as the following claims and equivalent concepts.

S1: 1st filtration step
S2: Secondary filtration step
S3: Oxidation process step
S4: biological treatment step
S5: 3rd filtration step

Claims (5)

A first filtration step (S1) of filtering foreign substances through physical treatment of wastewater composed of non-decomposable organic matter composed of filter yarns composed of several stages;
A secondary filtration step (S2) of discharging effluent suitable for the final environmental standard by passing through a filtration membrane composed of a hollow fiber membrane and a reverse osmosis membrane in several stages;
An oxidation process step (S3) of biologically and chemically reacting the recalcitrant organic matter caught in the filter and concentrated through an electrochemical oxidation process;
A biological treatment step (S4) of biologically degrading the wastewater containing recalcitrant organic matter treated in the oxidation process step (S3) through a high-temperature and high-speed biological treatment tank; and
A tertiary filtration step (S5) of purifying the wastewater treated in the biological treatment step (S4) again through a physical treatment step composed of filter sand.
characterized in that it includes
A method for purifying non-degradable organic wastewater. According to claim 1,
The filter is a submerged separator, characterized in that the PVDF separation with a filtration function of 0.001mm to 0.005mm
A method for purifying non-degradable organic wastewater. According to claim 1,
In the secondary filtration step (S2), the hollow fiber membrane and the reverse osmosis membrane have a basic structure of a hollow fiber membrane and a reverse osmosis membrane, several of one structure are connected in parallel, and ultrasonic waves having a length corresponding to the distance between the membranes Characterized in that it comprises an ultrasonic generator so that a standing wave of
A method for purifying non-degradable organic wastewater. According to claim 1,
The oxidation process step (S3) includes a DAS electrode, maintains the concentration through an acid (non-reducing acid) that is difficult to reduce, and electrolyzes a mixed solution of wastewater and non-reducing acid composed of recalcitrant organic matter. to be
A method for purifying non-degradable organic wastewater. According to claim 1,
The biological treatment step (S4) is aerobic. Characterized in that it comprises a biological treatment device containing acidophilic strains and composed of porous inorganic ceramics
A method for purifying non-degradable organic wastewater.