CN103523914B - Anaerobic and micro-aerobic baffle plate reactor for treating sulfur-containing organic wastewater and method for treating sulfur-containing organic wastewater - Google Patents

Abstract

The invention discloses a method for treating sulfur-containing organic wastewater by using an anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater, and relates to a baffle reactor for treating sulfur-containing wastewater and a method for treating sulfur-containing organic wastewater. It solves the problems of high load of the first cell and poor waste water treatment effect of the existing baffle reactor. The reactor is composed of the top, the bottom, the wall, the deflector and the aeration device. The cylindrical reactor is divided into four cells by the low deflector, which is adjacent to the low deflector on the axis of the bottom of the reactor. There is a high deflector, and a lower deflector is also arranged between the low deflector and the bottom of the device. Treatment method: 1. Fill activated sludge in the four compartments to control the temperature in the reactor; 2. Organic wastewater flows into each compartment in turn through the diversion device to control the dissolved oxygen concentration of the wastewater in the third compartment; 3. A part of the wastewater is refluxed , and the rest of the waste water is discharged. The invention reduces the load impact of the first compartment through backflow, and improves the water quality of the effluent by using the micro-oxygen aeration device.

Description

Method for treating sulfur-containing organic wastewater using an anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater

technical field

The invention relates to a baffle reactor for treating sulfur-containing wastewater and a method for using the reactor to treat sulfur-containing organic wastewater.

Background technique

With the rapid development of chemical industry, printing and dyeing, pharmaceutical and other industries, factories discharge a large amount of high-concentration sulfur-containing organic wastewater, and the sulfide produced will corrode metal pipes, and its pungent smell seriously threatens the ecological environment and the health of the people. The efficient removal of pollutants through biotechnology is a hot issue in the environmental field that needs to be solved urgently. Conventional treatment methods have problems such as long process flow, complicated operation and management, and low treatment efficiency. At the same time, the sulfide in the effluent will also cause secondary pollution.

The anaerobic baffle reactor is the third-generation anaerobic reactor, which uses the baffle structure to form multiple independent reactors in the reactor, realizing phase separation and multi-stage anoxic, and its flow state is mainly push flow. It has good buffering and adaptability to shock load and toxic substances in the influent, and also has the characteristics of no short flow, no clogging, no need for stirring and easy start-up, high volume load, small footprint, saving investment, and its disadvantage is that The first compartment has to bear a relatively high processing load and has a greater impact on the sludge. At the same time, several compartments are connected side by side, and the ratio of length to width is large, which is not conducive to the layout of the site.

In the application number: 201210545697.1, the invention patent titled "an anaerobic baffle reactor" discloses a kind of sewage treatment equipment, which mainly includes a bottom plate and a cylindrical reactor body, in which the separation plate and the bottom plate It is sealed and connected, and the reactor body is divided into no less than two reaction chambers connected in series and independent of each other. The deflector is vertically arranged and spaced apart from the partition plate, and the reaction chamber is divided into two upper flow chambers connected to each other at the bottom. compartments and downstream compartments.

Contents of the invention

The purpose of the present invention is to provide an anaerobic and micro-aerobic baffle reaction for treating sulfur-containing organic wastewater in order to solve the problems of high load in the first cell and poor wastewater treatment effect of the existing baffle reactor A device and a method for treating sulfur-containing organic wastewater.

The anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater of the present invention is composed of a reactor top, a reactor bottom, a reactor wall, a diversion device and an aeration device, wherein the diversion device is composed of a high-conductivity Composed of baffles, low baffles and lower baffles; the anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater is surrounded by the top of the reactor, the bottom of the reactor and the wall of the reactor to form a cylindrical shape. Four low deflectors are evenly arranged on the axis passing through the bottom of the reactor, and the anaerobic and micro-aerobic baffle reactor is divided into four compartments through the low deflectors. Clockwise are the first compartment, the second compartment, the third compartment and the fourth compartment;

Among them, the low deflector between the first compartment and the fourth compartment is extended and connected to the top of the reactor, and there is a gap between the top of the remaining three low deflectors and the top of the reactor, passing through the bottom axis of the reactor A high deflector is arranged adjacent to the low deflector on the upper side, and the angle between the high deflector and the low deflector is 14°~16°, and then between the two sides of the lower part of the low deflector and the bottom of the reactor There is a lower deflector between them, and there is a gap for waste water to pass between the lower deflector and the lower surface of the high deflector;

In the first compartment, there is a water inlet hole on the wall between the low deflector plate connected to the top of the reactor and the adjacent high deflector plate, and an aeration device is installed at the bottom of the third compartment. , There are water outlet holes and return holes on the upper part of the wall of the fourth compartment, and at the same time, there are gas collection holes on the top of the reactor of each compartment.

The method for applying the anaerobic and micro-oxygen baffle reactor of the present invention to process sulfur-containing organic wastewater is realized in the following steps:

1. Fill the four chambers of the anaerobic and micro-aerobic baffle reactor with a load of 0.35 to 0.45kgCOD/(kgVSS·d) in the four compartments of the sulfur-containing organic wastewater, and control the temperature in the reactor to 28～32℃;

2. Inject sulfur-containing organic waste water into the first chamber of the anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic waste water through the water inlet, and the organic waste water flows into the second chamber and the third chamber through the diversion device in turn. In the third compartment and the fourth compartment, the dissolved oxygen concentration of the wastewater in the third compartment is controlled to be 0.23-0.28 mg/L through the aeration device installed at the bottom of the third compartment;

3. Adjust the hydraulic retention time of the whole reactor to 28-32h. Part of the treated wastewater is used as reflux wastewater to flow back to the first compartment through the reflux hole on the wall of the fourth compartment, and the other part of the treated wastewater is used as purified water. Outflow, so as to complete the treatment of sulfur-containing organic wastewater.

The anaerobic and micro-aerobic baffle reactor used in the present invention for treating sulfur-containing organic wastewater divides the cylindrical reactor into four compartments on average, and two adjacent compartments are separated by deflectors. Due to the function of the deflector, the flow state of the organic wastewater in each cell is an upward flow, ensuring that the sludge is in an expanded state. The multi-chamber of the reactor can enable different microbial populations to survive under their own suitable conditions, and realize the phase separation of each functional flora. Different compartments are convenient for effective management and regulation, improve the treatment effect, and then establish a microbial ecosystem with synergistic effects of different functional flora in the same reactor.

In the first compartment and the second compartment of the anaerobic and micro-aerobic baffle reactor, the activated sludge is in an anaerobic environment, and the organic wastewater is mainly hydrolyzed and acidified, and the methanogenic stage is accompanied by sulfate reduction to realize the treatment of removal of organic matter. A micro-oxygen aeration device is installed in the third chamber to create a micro-oxygen environment. Under micro-aerobic conditions, the oxidation of sulfide to elemental sulfur is promoted, and at the same time, the activity of facultative bacteria is stimulated to further metabolize the organic matter in the wastewater. Part of the treated waste water flows back into the first compartment through the fourth compartment through the reflux pump to dilute the concentration of the reactor influent, reduce the volume load of the first compartment, and improve the impact load resistance of the reactor.

In summary, the advantages of the present invention's anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater and the method for treating sulfur-containing organic wastewater include:

(1) Two stages of organic matter removal and sulfide oxidation are realized in the same reaction system, the effluent water quality is good, and the process flow is simple;

(2) In terms of appearance, the anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater is cylindrical, and the four compartments are closely arranged and occupy a small area;

(3) The anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater has multiple compartments, and different microbial functional bacteria live in the corresponding compartments to achieve microbial phase separation, which is conducive to the efficient treatment of wastewater;

(4) Through the micro-oxygen aeration device installed in the third compartment, a micro-oxygen environment is created, which is beneficial to the oxidation of sulfides and the improvement of facultative bacteria activity, and further removes organic matter in the wastewater, further improving the quality of the reactor effluent, odorless taste;

(5) The reactor is set to reflux, which dilutes the influent concentration of sulfur-containing organic wastewater and improves the load shock resistance of the reactor;

(6) The reactor has multiple compartments, and various control schemes can be selectively implemented, and the operability is strong.

Description of drawings

Fig. 1 is a schematic diagram of the external structure of the anaerobic and micro-aerobic baffle reactor of the present invention for treating sulfur-containing organic wastewater, A—the first compartment, B—the second compartment, C—the third compartment, D—the first compartment Four chambers, 3—reactor wall, 5—water inlet hole, 6—water outlet hole, 7—reflux hole;

Fig. 2 is the internal structure schematic diagram of the anaerobic and micro-aerobic baffle reactor of the present invention for treating sulfur-containing organic wastewater, E—upward flow area, F—downward flow area, 1—reactor top, 2—reaction At the bottom of the device, 4-1—high deflector, 4-2—low deflector, 4-3—lower deflector, 8—gathering hole, 9—aeration device.

Detailed ways

Embodiment 1: The anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater in this embodiment consists of a reactor top 1, a reactor bottom 2, a reactor wall 3, a flow guide device and an aeration device 9 components, in which the deflector is composed of a high deflector 4-1, a low deflector 4-2 and a lower deflector 4-3; the anaerobic and micro-oxygen baffle reactor for treating sulfur-containing organic wastewater passes through The top 1 of the reactor, the bottom 2 of the reactor and the wall 3 of the reactor form a cylindrical shape, and 4 low deflectors 4-2 are evenly arranged on the axis passing through the bottom 2 of the reactor, and the low deflectors 4 -2 Divide the anaerobic and micro-aerobic baffle reactor into four compartments, and the four compartments are the first compartment A, the second compartment B, and the third compartment C clockwise in the direction of the top view and the fourth compartment D;

Wherein the low baffle 4-2 between the first compartment A and the fourth compartment D is extended and connected to the top 1 of the reactor, and the tops of the other three low baffles 4-2 are connected to the top 1 of the reactor. There is a gap between them, and a high deflector 4-1 is arranged adjacent to the low deflector 4-2 on the axis of the bottom 2 of the reactor, and the angle between the high deflector 4-1 and the low deflector 4-2 14°～16°, and between the two sides of the lower part of the low deflector 4-2 and the bottom 2 of the reactor, a lower deflector 4-3 is arranged, and the lower deflector 4-3 and the high deflector There is a gap for waste water to pass between the lower end faces of 4-1;

In the first cell A, there is a water inlet 5 on the wall between the low deflector 4-2 connected to the top 1 of the reactor and the adjacent high deflector 4-1. The bottom of the compartment C is provided with an aeration device 9, and the upper part of the wall of the fourth compartment D is provided with a water outlet hole 6 and a return hole 7, and at the same time, a gas collection hole is also provided on the top 1 of the reactor of each compartment 8.

In this embodiment, the high deflectors 4-1 and the low deflectors 4-2 are arranged vertically.

In this embodiment, the anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater is composed of four compartments, and each compartment is divided into an upward flow area E and a downward flow area F by a deflector. There is activated sludge in the upflow area, where the wastewater undergoes biological treatment, and then enters the next compartment through the downflow area, and there is a micro-oxygen aeration device in the upflow area of the third compartment, so that the activated sludge Under the micro-aerobic environment, the sulfide is oxidized to elemental sulfur, and at the same time, the activity of facultative bacteria is stimulated to realize the further metabolism of organic matter in wastewater. A reflux pipe is provided on the upper part of the upward flow area of the fourth compartment, and the reflux water mixes with the reactor water and enters the reactor to reduce the volume load of the first compartment.

Embodiment 2: This embodiment differs from Embodiment 1 in that the angle between the lower deflector 4-3 and the bottom 2 of the reactor is 45°. Other devices are the same as in the first embodiment.

Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the height-to-diameter ratio of the anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater is 3.5:1. Other devices are the same as those in Embodiment 1 or 2.

Specific implementation mode four: the method of applying anaerobic and micro-aerobic baffle reactor in this embodiment to process sulfur-containing organic wastewater is implemented according to the following steps:

1. Fill the four chambers of the anaerobic and micro-aerobic baffle reactor with a load of 0.35 to 0.45kgCOD/(kgVSS·d) in the four compartments of the sulfur-containing organic wastewater, and control the temperature in the reactor to 28～32℃;

2. The sulfur-containing organic wastewater is injected into the first chamber of the anaerobic and micro-aerobic baffle reactor through the water inlet, and the organic wastewater flows into the second chamber, the third chamber and the fourth chamber through the diversion device in turn chamber, through the aeration device installed at the bottom of the third chamber, the dissolved oxygen concentration of the wastewater in the third chamber is controlled to be 0.23-0.28mg/L;

3. Adjust the hydraulic retention time of the whole reactor to 28-32h. Part of the treated wastewater is used as reflux wastewater to flow back to the first compartment through the reflux hole on the wall of the fourth compartment, and the other part of the treated wastewater is used as purified water. Outflow, so as to complete the treatment of sulfur-containing organic wastewater.

In this embodiment, each cell of the anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater is filled with activated sludge, and the sulfur-containing organic wastewater enters the first cell of the reactor and mixes with the activated sludge. Carry out hydrolysis and acidification, enter the second compartment through the deflector, and complete the methanation of wastewater treatment. In addition, due to the existence of sulfate reduction, the sulfide content in wastewater increases; wastewater in the third compartment due to micro-oxygen exposure The sulfide is oxidized to elemental sulfur by the gas device; the waste water continues to remove the organic matter in the water due to the action of facultative bacteria in the fourth compartment to realize the further treatment of the waste water, and at the same time, part of the effluent from the fourth compartment is returned to the first compartment.

Embodiment 5: This embodiment is different from Embodiment 4 in that step 2 controls the dissolved oxygen concentration of wastewater in the third chamber to 0.25 mg/L through the aeration device installed at the bottom of the third chamber. Other steps are the same as in Embodiment 4.

Embodiment 6: The difference between this embodiment and Embodiment 4 or 5 is that step 3 adjusts the hydraulic retention time of the entire reactor to 30 h. Other steps are the same as those in Embodiment 4 or 5.

Embodiment 7: This embodiment differs from Embodiment 4 to Embodiment 6 in that part of the treated waste water flows back to the first chamber through the return hole on the wall of the fourth chamber as backflow waste water, and its reflux ratio is 500. %. Other steps are the same as those in Embodiments 4 to 6.

Embodiment one: the method for applying the anaerobic and micro-aerobic baffle reactor of the present invention to process sulfur-containing organic wastewater is implemented in the following steps:

1. Fill the four chambers of the anaerobic and micro-aerobic baffle reactor with a load of 0.4kgCOD/(kgVSS·d) in the four chambers of the anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater, and control the temperature in the reactor to 30°C ;

2. The sulfur-containing organic wastewater is injected into the first chamber of the anaerobic and micro-aerobic baffle reactor through the water inlet, and the organic wastewater flows into the second chamber, the third chamber and the fourth chamber through the diversion device in turn chamber, close the aeration device provided at the bottom of the third chamber;

3. Adjust the hydraulic retention time of the whole reactor to be 30h. According to the reflux ratio of 500%, a part of the treated wastewater is used as reflux wastewater to flow back to the first compartment through the reflux hole on the wall of the fourth compartment, and the other part is treated. The waste water flows out as purified water, thus completing the treatment of sulfur-containing organic waste water.

The activated sludge filled in the four compartments of Step 1 of this embodiment is the secondary sedimentation tank activated sludge of Wenchang Sewage Treatment Plant in Harbin City, and the sludge load is 0.4kgCOD/(kgVSS d), and the method of gradually increasing the reactor load is adopted. ways to domesticate sludge, and the domestication period is 20 days.

In this example, the sulfur-containing organic wastewater is synthetic wastewater, and its composition includes Na ₂ SO ₄ 9H ₂ O, KNO ₃ , sodium lactate, NaHCO ₃ , NH ₄ Cl, etc. The condition for stable operation is: the volume load of COD is 0.8kg /m ³ ·d, the volume load of SO ₄ ^2- -S is 0.8kg/m ³ ·d, the volume load of NO ₃ ^-N is 0.52kg/m ³ ·d, pH=7.5.

Embodiment two: present embodiment applies anaerobic and micro-oxygen baffle reactor of the present invention to process the method for sulfur-containing organic wastewater according to the following steps:

1. Fill the four chambers of the anaerobic and micro-aerobic baffle reactor with a load of 0.4kgCOD/(kgVSS·d) in the four chambers of the anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater, and control the temperature in the reactor to 30°C ;

2. The sulfur-containing organic wastewater is injected into the first compartment of the baffle reactor through the water inlet pipe, and the organic wastewater flows into the second compartment, the third compartment and the fourth compartment through the diversion device in turn, and passes through the third compartment The aeration device installed at the bottom of the chamber controls the dissolved oxygen concentration of the wastewater in the third chamber to 0.10mg/L;

3. Adjust the hydraulic retention time of the whole reactor to be 30h. According to the reflux ratio of 500%, a part of the treated wastewater is used as reflux wastewater to flow back to the first compartment through the reflux hole on the wall of the fourth compartment, and the other part is treated. The waste water flows out as purified water, thus completing the treatment of sulfur-containing organic waste water.

Embodiment 3: The difference between this embodiment and Embodiment 2 is that in Step 2, the dissolved oxygen concentration of the wastewater in the third chamber is controlled to 0.25 mg/L by the aeration device installed at the bottom of the third chamber.

Embodiment 4: The difference between this embodiment and Embodiment 2 is that in Step 2, the dissolved oxygen concentration of the wastewater in the third chamber is controlled to 0.40 mg/L by the aeration device installed at the bottom of the third chamber.

The experimental results of Embodiment 1 to Embodiment 4 are shown in Table 1 below;

Table 1

Illustrated by the above specific examples, when the present invention treats sulfur-containing organic wastewater, the removal rates of COD and sulfate are respectively above 75% and 80%, and the sulfide concentration in the effluent is very high through the micro-oxygen aeration in the third compartment. Low, the removed sulfide is converted into elemental sulfur, and the recovery rate of elemental sulfur is above 70%. It can be seen that the present invention realizes the efficient degradation of COD in sulfur-containing organic wastewater during anaerobic treatment, and controls the effluent under microaerobic conditions. The concentration of sulfide is simultaneously converted to elemental sulfur.

Claims (3)

1. The method that the anaerobic and micro-aerobic baffle reactor for the treatment of sulfur-containing organic waste water is used to process sulfur-containing organic waste water. 1), the reactor bottom (2), the reactor wall (3), the deflector and the aeration device (9), wherein the deflector is composed of a high deflector (4-1), a low deflector (4-2) and the lower deflector (4-3); the anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic waste water passes through the reactor top (1), the reactor bottom (2) and The reactor wall (3) is surrounded by a cylinder, and 4 low deflectors (4-2) are evenly arranged on the axis passing through the reactor bottom (2). The oxygen and micro-oxygen baffle reactor is divided into four compartments, and the four compartments are the first compartment (A), the second compartment (B), and the third compartment ( C) and the fourth compartment (D); The low deflector (4-2) between the first compartment (A) and the fourth compartment (D) is extended and connected to the top of the reactor (1), and the remaining three low deflectors (4-2 There is a gap between the top of ) and the reactor top (1), and a high deflector (4-1) is arranged adjacent to the low deflector (4-2) on the axis of the reactor bottom (2), The included angle between the high deflector (4-1) and the low deflector (4-2) is 14° to 16°, and then on both sides of the lower part of the low deflector (4-2) and the bottom of the reactor ( 2) There is a lower deflector (4-3) between them, and there is a gap for waste water to pass between the lower deflector (4-3) and the lower surface of the high deflector (4-1); In the first compartment (A), there are openings on the wall between the low deflector (4-2) and the adjacent high deflector (4-1) that are connected to the top of the reactor (1). A water inlet hole (5), an aeration device (9) is arranged at the bottom of the third compartment (C), and a water outlet hole (6) and a return hole (7) are opened on the upper part of the wall of the fourth compartment (D). ), simultaneously on the top (1) of the reactor of each cell, also be provided with gas-collecting holes (8); It is characterized in that the method for treating sulfur-containing organic wastewater using an anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater is implemented according to the following steps: 1. Fill the four chambers of the anaerobic and micro-aerobic baffle reactor with a load of 0.35 to 0.45kgCOD/(kgVSS·d) in the four compartments of the sulfur-containing organic wastewater, and control the temperature in the reactor to 28～32℃; 2. Inject sulfur-containing organic waste water into the first chamber of the anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic waste water through the water inlet, and the organic waste water flows into the second chamber and the third chamber through the diversion device in turn. In the third compartment and the fourth compartment, the dissolved oxygen concentration of the wastewater in the third compartment is controlled to be 0.23-0.28 mg/L through the aeration device installed at the bottom of the third compartment; 3. Adjust the hydraulic retention time of the whole reactor to 28-32h. Part of the treated waste water is used as reflux waste water to flow back to the first compartment through the reflux hole on the wall of the fourth compartment. The reflux ratio is 500%, and the other part is treated. The final wastewater flows out as purified water, thereby completing the treatment of sulfur-containing organic wastewater. 2. the method for treating sulfur-containing organic wastewater using an anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater according to claim 1, characterized in that step 2 is provided with an aeration device at the bottom of the third compartment Control the dissolved oxygen concentration of the wastewater in the third compartment to 0.25mg/L. 3. the method for treating sulfur-containing organic wastewater using an anaerobic and micro-aerobic baffle reactor for treating sulfur-containing organic wastewater according to claim 1, wherein step 3 adjusts the hydraulic retention time of the entire reactor to be 30h.