CN113461146B - Cr (VI) -containing wastewater treatment device based on electrode biofilm method - Google Patents

Abstract

A Cr (VI) -containing wastewater treatment device based on an electrode biofilm method relates to the technical field of heavy metal-containing wastewater treatment, and comprises a water inlet buffer tank, a wastewater treatment tank and a drainage buffer tank which are sequentially connected; the waste water treatment box is internally divided into a plurality of reaction tanks which are sequentially connected from top to bottom by partition plates which are arranged from top to bottom at intervals in parallel, the partition plates are made of conductive materials or are paved with electrode plates, a plurality of biofilm culturing core rods are horizontally arranged in the reaction tanks, each biofilm culturing core rod comprises an electrode rod and a vortex biofilm culturing plate connected with the electrode rod, and each vortex biofilm culturing plate is provided with a water permeable hole and a substrate for microorganisms to attach to form a biofilm culturing.

Description

Cr (VI) -containing wastewater treatment device based on electrode biofilm method

Technical Field

The invention relates to the technical field of treatment of wastewater containing heavy metals, in particular to a Cr (VI) containing wastewater treatment device based on an electrode biofilm method.

Background

Cr (VI) is a highly toxic heavy metal pollutant, and the treatment technologies of the wastewater containing Cr (VI) are many, such as a photocatalytic method, an electrochemical method, a biological method and the like. The electrode biofilm method combines electrochemical action and biological action, microorganisms are fixed on the surface of a cathode to form a biofilm by domesticating and hanging the biofilm, Cr (VI) is combined with functional groups of a microbial cell surface structure in the form of metal cations and attached to the cell surface, and is reduced into Cr (III) by the catalytic action of Cr (VI) reductase or is reduced into Cr (III) in cells by transport of transport proteins across the biofilm.

A method for synchronously removing nitrate and hexavalent chromium in groundwater by using a biofilm reactor is disclosed in the documents Zhai Siyuan, Zhao Yingxin, Ji Min, Qi Wenfang, Simultaneous removal of nitrate and chromium in group water by a spiral fiber based bio-reactor, Bioresource Technology, 2017, 232: 278-. Wherein, when the C/N of the inlet water is 0.9-1, the removal rate of the biofilm reactor to the hexavalent chromium in the water is close to 100 percent, and the excellent removal effect is shown. However, in the above documents, the actual effective contact area between the biofilm and the wastewater is low due to the structure of the biofilm reactor, and the wastewater treatment efficiency is to be improved.

Disclosure of Invention

The invention aims to provide a Cr (VI) -containing wastewater treatment device which has a novel structure and higher wastewater treatment efficiency.

In order to achieve the purpose, the invention adopts the following technical scheme: a Cr (VI) -containing wastewater treatment device based on an electrode biofilm method comprises a water inlet buffer tank, a wastewater treatment tank and a drainage buffer tank which are connected in sequence;

the waste water treatment tank is internally provided with a plurality of reaction tanks by partition boards which are arranged from top to bottom at intervals in parallel, the partition boards are made of conductive materials or are provided with electrode plates on the upper surface and/or the lower surface, the reaction tanks are sequentially connected from top to bottom by virtue of drainage gaps arranged at the front end and/or the rear end of the partition boards, a plurality of biological film hanging core rods which extend from front to back are horizontally arranged in the reaction tanks, the front end and the rear end of each biological film hanging core rod are respectively detachably connected with the front side wall and the rear side wall of the waste water treatment tank, each biological film hanging core rod comprises an electrode rod and a vortex film hanging plate connected with the electrode rod, the electrode rod is positioned at the axis of the vortex film hanging plate, the vortex film hanging plate is provided with a water permeable hole and is provided with a substrate for microorganisms to attach to form a film, a waste gas discharge pipe is arranged in the waste water treatment tank, and the waste gas discharge pipe passes through each reaction tank and penetrates out from the top end of the waste water treatment tank, and the side wall of the part of the waste gas discharge pipe penetrating the reaction tank is provided with a waste gas collecting port or a waste gas collecting hole, and waste gas in the reaction tank enters the waste gas discharge pipe through the waste gas collecting port or the waste gas collecting hole and is discharged from the top end of the waste gas discharge pipe.

Wherein, the top of the buffer tank of intaking is equipped with the interface of intaking, the top of drainage buffer tank is equipped with the drainage interface, the lowest point of the interface of intaking and drainage interface all is higher than the highest water storage position of waste water treatment case, exhaust emission's top is higher than the highest water storage position of the buffer tank of intaking and drainage buffer tank.

The front side wall and the rear side wall of the wastewater treatment box are both provided with a plurality of mandrel positioning and mounting holes, and mandrel positioning seats are mounted in the mandrel positioning and mounting holes;

the mandrel positioning seat comprises an end cover plate and a convex ring arranged on the end cover plate, the outer diameter of the convex ring is matched with the aperture of a mandrel positioning installation hole, the inner diameter of the convex ring is matched with the peripheral size of the vortex-shaped film hanging plate, an electrode rod positioning pin is arranged at the center of an area surrounded by the convex ring, positioning holes matched with the electrode rod positioning pin are formed in the front end and the rear end of the electrode rod, the end cover plate is positioned outside the wastewater treatment box and fixedly connected to the side wall of the wastewater treatment box through bolts, the convex ring is inserted into the mandrel positioning installation hole, the vortex-shaped film hanging plate is inserted into a gap between the convex ring and the electrode rod positioning pin, and the electrode rod positioning pin is inserted into the positioning hole corresponding to the electrode rod.

Preferably, the mandrel positioning seat comprises a first mandrel positioning seat mounted on the front side wall of the wastewater treatment box and a second mandrel positioning seat mounted on the rear side wall of the wastewater treatment box, guide holes are respectively formed in the electrode bar positioning pins of the first mandrel positioning seat and the second mandrel positioning seat along the axial direction of the electrode bar positioning pins, the guide holes in the second mandrel positioning seat penetrate through the end cover plate, end cap bolts used for plugging corresponding guide holes are detachably connected to the end cover plate of the second mandrel positioning seat, and positioning holes formed in the electrode bar axially penetrate through the whole electrode bar and are coaxially aligned with the guide holes in the first mandrel positioning seat and the second mandrel positioning seat.

Preferably, the buffer tank that intakes sets up in wastewater treatment case top, the buffer tank that intakes uses wastewater treatment case's roof as the bottom plate, set up the water inlet with the inner chamber intercommunication of buffer tank and wastewater treatment case of intaking on wastewater treatment case's the roof, exhaust gas discharge pipe passes and its top is higher than the highest water storage level of buffer tank that intakes from the buffer tank that intakes.

Further, the drainage buffer tank is including setting up the main tank body on waste water treatment case left side or right side and setting up the auxiliary tank body of waste water treatment case below, the auxiliary tank body regards the bottom plate of waste water treatment case as the roof and including the enclosure baffle of connecting waste water treatment bottom of the case end, the main tank body includes preceding baffle, backplate and side shield, the left side wall or the right side wall of waste water treatment case are connected to the one end of preceding baffle and backplate, the side shield is connected to the other end of preceding baffle and backplate, the bottom of auxiliary tank body and main tank is sealed through a monoblock bottom plate, set up the delivery port of intercommunication auxiliary tank inner chamber on the bottom plate of waste water treatment case, the intercommunication mouth of intercommunication main tank inner chamber is seted up to the bottom of enclosure baffle, the drainage interface sets up the top at the main tank body.

Preferably, the top end of the water inlet buffer tank is flush with the top end of the main tank body of the water outlet buffer tank and is sealed by a whole top plate.

As an alternative embodiment, the vortex-shaped biofilm culturing plate is a plastic plate, the surface of the plastic plate is flocked to form a flocked layer, and the flocked layer is used as a substrate for microorganisms to attach to form a biofilm culturing film.

Furthermore, the wastewater treatment device containing Cr (VI) also comprises a direct current stabilized voltage power supply, and the electrode bar and the electrode plate are respectively and correspondingly connected with the positive electrode or the negative electrode of the direct current stabilized voltage power supply.

Compared with the wastewater treatment device based on the electrode biofilm method in the prior art, the wastewater treatment device containing Cr (VI) provided by the invention has the main improvements that: 1. the wastewater treatment box is internally divided by partition plates to form a plurality of reaction tanks which are connected in sequence, and meanwhile, electrode plates are laid on the surfaces of the partition plates, and a plurality of biofilm culturing core rods with vortex-shaped biofilm culturing plates are arranged in each reaction tank. 2. The water inlet buffer tank is arranged at the upstream of the wastewater treatment tank by taking the water flow direction as reference, and the water discharge buffer tank is arranged at the downstream of the wastewater treatment tank. In the invention, after the wastewater treatment tank is divided into a plurality of reaction tanks which are connected in sequence, the volume of the wastewater in a single reaction tank is smaller, the wastewater can be more uniformly and fully contacted with the biological membrane on the surface of the vortex-shaped biofilm culturing plate, and hexavalent chromium can be more efficiently reduced into trivalent chromium through the electrochemical action and the microbial action which occur on the electrode. Meanwhile, the electrode rod is arranged at the center of the biological biofilm culturing mandrel, the biofilm culturing plate is positioned between the electrode rod and the electrode plate on the partition plate, the biofilm culturing plate adopts a vortex-shaped structure, and the axial direction of the biofilm culturing plate is consistent with the water flow direction. In addition, the water inlet buffer tank is arranged at the upstream of the wastewater treatment tank, and the water discharge buffer tank is arranged at the downstream of the wastewater treatment tank, so that the design can relieve the water flow disturbance in the wastewater treatment tank caused by the fluctuation of water inlet and discharge speeds to a certain extent, the wastewater treatment can be carried out in a relatively calmer water flow environment, the condition that the biofilm falls off from the biofilm formation plate due to water flow scouring is relieved, and the wastewater treatment effect can be better ensured.

Drawings

FIGS. 1 to 4 are schematic perspective views of a photochemical Cr (VI) wastewater treatment apparatus at different viewing angles, wherein the mandrel positioning seat is removed from FIG. 4;

FIG. 5 is a schematic view showing the internal structure of a wastewater treatment tank;

FIG. 6 is a schematic view of the internal structure of the wastewater treatment tank after the biofilm culturing core rod is removed;

FIG. 7 is a schematic perspective view of a biofilm culturing mandrel;

FIG. 8 is a partial enlarged view of portion A of FIG. 7;

fig. 9 is a schematic perspective view of the first mandrel positioning seat;

fig. 10 is a schematic perspective view of a second mandrel positioning seat;

FIG. 11 is a schematic view of a connection structure of a biofilm culturing mandrel and a first mandrel positioning seat;

FIG. 12 is a schematic view of a connection structure of a biofilm culturing mandrel and a second mandrel positioning seat;

FIG. 13 is a schematic view showing the positions and connections between the wastewater treatment tank and the sub-tanks of the inlet buffer tank and the drain buffer tank;

FIG. 14 is a schematic view showing the positional relationship and the connection relationship between the wastewater treatment tank and the main tanks of the inlet buffer tank and the drain buffer tank.

In the figure:

1-inlet buffer tank 2-wastewater treatment tank 3-drainage buffer tank

4-biological film-hanging core rod 5-waste gas discharge pipe 6-core rod positioning seat

1 a-water inlet interface 2 a-clapboard 2 b-reaction tank

2c core rod positioning and mounting hole 3a drainage port 3b main box body

3 c-auxiliary box body 4 a-electrode bar 4 b-vortex film-hanging plate

5a waste gas collecting hole 6a end cover plate 6b convex ring

6 c-electrode bar positioning pin 6 d-plug bolt 2a 1-drainage notch

3b1 front baffle 3b2 rear baffle 3b3 side baffle

3c1 baffle 4a1 positioning hole 4b1 water permeable hole

6c1, a guide hole 6.1, a first mandrel positioning seat 6.2 and a second mandrel positioning seat.

Detailed Description

For the understanding of those skilled in the art, the cr (vi) -containing wastewater treatment apparatus based on the electrode biofilm method and the operation principle thereof according to the present invention will be further described with reference to the following examples and the accompanying drawings, and the contents of the embodiments are not intended to limit the present invention.

It is emphasized that in the description of the present invention, the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "mounted," "connected," and "connected" should be interpreted broadly, such as mechanically coupled or communicating between two elements, directly connected or indirectly connected through intervening media, as one of ordinary skill in the art would understand the specific meaning of the terms as they are used in a particular situation.

Fig. 1 to 4 show the three-dimensional structure of the cr (vi) -containing wastewater treatment device at different viewing angles, and as shown in the figure, the cr (vi) -containing wastewater treatment device comprises a water inlet buffer tank 1, a wastewater treatment tank 2 and a water outlet buffer tank 3 which are connected in sequence. As shown in fig. 5 and 6, a plurality of partition plates 2a are provided in parallel from top to bottom in the wastewater treatment tank 2, the inner chamber of the wastewater treatment tank 2 is partitioned by the partition plates 2a to form a plurality of reaction tanks 2b, and a drainage notch 2a1 is provided at the front end and/or the rear end of the partition plate 2a, and the reaction tanks 2b are connected in sequence from top to bottom by the drainage notch 2a 1. The separator 2a is made of a conductive material or electrode sheets are laid on the upper and/or lower surfaces thereof. In addition, a plurality of biofilm culturing core rods 4 extending from front to back are horizontally arranged in the reaction tank 2b, and the front end and the back end of each biofilm culturing core rod 4 are detachably connected to the front side wall and the back side wall of the wastewater treatment tank 2 respectively. As shown in FIGS. 7 and 8, the biofilm culturing mandrel 4 comprises an electrode rod 4a and a spiral biofilm culturing plate 4b connected with the electrode rod 4a, wherein the electrode rod 4a is arranged at the axis of the spiral biofilm culturing plate 4b, and the spiral biofilm culturing plate 4b is provided with a water permeable hole 4b1 and a substrate for microorganisms to attach to form a biofilm. It should be noted that the substrate for attaching the microorganisms to form the biofilm may be a rough surface layer formed on the surface of the spiral biofilm formation plate 4b by mechanical processing or chemical corrosion, or a fiber material with a porous structure attached to the surface of the spiral biofilm formation plate 4b by gluing or other fixing means (e.g., fixing by rivets from the water permeable holes 4b 1), or for example, a plastic plate may be used to manufacture the spiral biofilm formation plate 4b and a flocked layer formed on the surface of the plastic plate by flocking, and the flocked layer may also serve as a substrate for attaching the microorganisms to form the biofilm. It will be understood by those skilled in the art that it is sufficient if it can achieve the purpose of allowing microorganisms to attach and form a biofilm. In addition, an exhaust gas discharge pipe 5 is further disposed in the wastewater treatment tank 2, the exhaust gas discharge pipe 5 passes through each reaction tank 2b and penetrates out of the top end of the wastewater treatment tank 2, an exhaust gas collection port or an exhaust gas collection hole 5a is formed in a side wall of a portion where the exhaust gas discharge pipe 5 passes through the reaction tank 2b, so that exhaust gas generated in the reaction tank 2b can enter the exhaust gas discharge pipe 5 through the exhaust gas collection port or the exhaust gas collection hole 5a and be discharged from the top end thereof, the exhaust gas discharge pipe 5 can also serve as a carbon source supply pipe in addition to discharging excess exhaust gas, and carbon sources can be supplied to the wastewater through the exhaust gas discharge pipe 5 at a certain carbon-nitrogen ratio (whether carbon sources need to be supplied or not is determined according to actual reaction conditions).

It should be noted that, as will be understood by those skilled in the art, the above-mentioned wastewater treatment apparatus may be externally connected with a dc power supply (or share a dc power supply with other devices), or may be provided with a dc regulated power supply, and the electrode rod 4a and the electrode plate are respectively connected to the positive electrode or the negative electrode of the dc regulated power supply. In the above embodiment, the wastewater treatment tank 2 is divided into the plurality of reaction tanks 2b connected in sequence, so that the volume of wastewater contained in a single reaction tank 2b is small, and the wastewater can be more uniformly and sufficiently contacted with the biofilm on the surface of the spiral-shaped film-hanging plate 4b, thereby reducing hexavalent chromium into trivalent chromium more efficiently through the electrochemical action and the microbial action generated on the electrode. In addition, in the above embodiment, the electrode rod 4a is arranged at the center of the biofilm culturing mandrel rod 4, so that the biofilm culturing plate is positioned between the electrode rod 4a and the electrode plates on the partition plate 2a, and the biofilm culturing plate adopts a vortex structure, and the axial direction of the biofilm culturing plate is consistent with the water flow direction. It should be noted that, in the above embodiment, the inlet buffer tank 1 is disposed at the upstream of the wastewater treatment tank 2, and the outlet buffer tank 3 is disposed at the downstream of the wastewater treatment tank 2 (as viewed from the water flow direction, "upstream" and "downstream"), so that the disturbance of the water flow in the wastewater treatment tank 2 caused by the fluctuation of the inlet and outlet water speeds can be alleviated to some extent, the wastewater treatment can be performed in a relatively calmer water flow environment, the falling of the biofilm from the biofilm hanging plate due to the water flow scouring can be reduced, and the wastewater treatment effect can be better ensured.

Further, in the above embodiment, the top of the water inlet buffer tank 1 is provided with the water inlet interface 1a, the top of the water outlet buffer tank 3 is provided with the water outlet interface 3a, the lowest points of the water inlet interface 1a and the water outlet interface 3a are both higher than the highest water storage level of the wastewater treatment tank 2, and the top end of the exhaust gas discharge pipe 5 is higher than the highest water storage level of the water inlet buffer tank 1 and the water outlet buffer tank 3. The lowest point of the water inlet interface 1a and the water discharge interface 3a is designed to be higher than the highest water storage level of the wastewater treatment tank 2, the water storage level in the water inlet buffer tank 1 and the water discharge buffer tank 3 can be guaranteed to be higher than the wastewater treatment tank 2 under the condition of utilizing the gravity of a water body to convey (the water inlet buffer tank 1, the wastewater treatment tank 2 and the water discharge buffer tank 3 form a communicating vessel under the condition) mainly, so that the wastewater treatment tank 2 can be always guaranteed to be full of wastewater, and the denitrification reaction effect and the wastewater treatment efficiency are guaranteed.

In order to facilitate the installation and fixation of the biofilm culturing mandril 4, as shown in fig. 13 and 6, in the present embodiment, a plurality of mandril positioning and mounting holes 2c are respectively formed on the front and rear side walls of the wastewater treatment tank 2, and the mandril positioning seat 6 is installed in the mandril positioning and mounting holes 2 c. Fig. 9 shows the structure of the mandrel positioning seat 6, and as a whole, the mandrel positioning seat 6 includes an end cover plate 6a and a convex ring 6b provided on the end cover plate 6 a. Wherein, the outer diameter of the convex ring 6b is matched with the aperture of the mandrel positioning and mounting hole 2c, and the inner diameter of the convex ring 6b is matched with the peripheral dimension of the vortex-shaped film hanging plate 4 b. In addition, an electrode rod positioning pin 6c is provided at the center of the region surrounded by the convex ring 6 b. Correspondingly, the front end and the rear end of the electrode rod 4a are provided with positioning holes 4a1 matched with the electrode rod positioning pins 6 c. When the electrode rod positioning device is fixedly installed, the end cover plate 6a of the mandrel positioning seat 6 is positioned outside the wastewater treatment tank 2 and fixedly connected to the side wall of the wastewater treatment tank 2 through bolts, the convex ring 6b is inserted into the mandrel positioning installation hole 2c, the spiral film hanging plate 4b is inserted into a gap between the convex ring 6b and the electrode rod positioning pin 6c, and the electrode rod positioning pin 6c is inserted into the positioning hole 4a1 corresponding to the electrode rod 4a (see fig. 11-12). It should be noted that in practical applications, as the reaction process continues, the biofilm may sometimes fall off or fail. At the moment, in the traditional biofilm reactor, the wastewater treatment is usually suspended, and the microbial acclimation and biofilm formation are carried out again. In this embodiment, for the purpose of shortening the interruption time and ensuring the wastewater treatment efficiency, a scheme of replacing the biofilm culturing core rod 4 with a new one is adopted, and the specific operation mode is to firstly complete the biofilm culturing on the surface of the biofilm culturing core rod 4 at another place (for example, a biofilm culturing device can be specially arranged), and then replace the failed core rod with the biofilm culturing core rod 4 which has completed the biofilm culturing. In order to facilitate the rapid replacement of the biofilm culturing mandrel 4, the mandrel positioning seat 6 comprises a first mandrel positioning seat 6.1 arranged on the front side wall of the wastewater treatment box 2 and a second mandrel positioning seat 6.2 arranged on the rear side wall of the wastewater treatment box 2, guide holes 6c1 are respectively arranged on the electrode bar positioning pins 6c of the first mandrel positioning seat 6.1 and the second mandrel positioning seat 6.2 along the axial direction thereof, unlike the first mandrel positioning seat 6.1, the guide hole 6c1 on the second mandrel positioning seat 6.2 penetrates the end cover plate 6a, meanwhile, a plug bolt 6d (shown in fig. 4) for plugging the corresponding guide hole 6c1 is detachably connected to the end cover plate 6a of the second mandrel positioning seat 6.2, and a positioning hole 4a1 formed in the electrode rod 4a axially penetrates through the entire electrode rod 4a and is coaxially aligned with the guide holes 6c1 in the first mandrel positioning seat 6.1 and the second mandrel positioning seat 6.2. The mode of dismantling the failed core rod is very simple and various, and is not described herein again, and the following focuses on the installation process of the new biofilm culturing core rod 4: when the biofilm culturing mandrel 4 is installed in the wastewater treatment box 2, the first mandrel positioning seat 6.1 is fixed in a mandrel positioning installation hole 2c on the front side wall of the wastewater treatment box 2, a straight bar-shaped guide rod penetrates through a positioning hole 4a1 on the electrode rod 4a and a guide hole 6c1 on the second mandrel positioning seat 6.2, the front end of the guide rod is inserted into a guide hole 6c1 of the first mandrel positioning seat 6.1 through a mandrel positioning installation hole 2c on the rear side wall of the wastewater treatment box 2, the biofilm culturing mandrel 4 is pushed into the wastewater treatment box 2 through a mandrel positioning installation hole 2c on the rear side wall of the wastewater treatment box 2 along the guide rod, finally, the second mandrel positioning seat 6.2 is pushed into the mandrel positioning installation hole 2c on the rear side wall of the wastewater treatment box 2 along the guide rod and is fixed by a bolt, and a plug bolt 6d is screwed into a corresponding guide hole 6c 1. As can be seen from the installation process, in the whole process, the biofilm culturing mandrel 4 can be very easily and conveniently installed in the wastewater treatment tank 2 through the guiding of the guide rod, the biofilm culturing mandrel 4 only contacts with the guide rod in the installation process, the guide rod only passes through the positioning hole 4a1 of the electrode rod 4a and does not contact with the spiral biofilm culturing plate 4b, and the spiral biofilm culturing plate 4b does not need to contact with other installation tools, so that the situation that the biofilm on the surface of the spiral biofilm culturing plate 4b is damaged or falls off due to touch in the installation process can be well avoided, and the subsequent wastewater treatment effect and efficiency are further ensured.

Finally, as shown in fig. 13-14, the inlet buffer tank 1 is disposed above the wastewater treatment tank 2, the inlet buffer tank 1 uses the top plate of the wastewater treatment tank 2 as the bottom plate, the top plate of the wastewater treatment tank 2 is provided with a water inlet for communicating the inlet buffer tank 1 with the inner cavity of the wastewater treatment tank 2, and accordingly, the exhaust gas discharge pipe 5 passes through the inlet buffer tank 1 and the top end of the exhaust gas discharge pipe is higher than the highest water storage level of the inlet buffer tank 1. The drain buffer tank 3 comprises a main tank body 3b arranged on the left side or the right side of the wastewater treatment tank 2 and an auxiliary tank body 3c arranged below the wastewater treatment tank 2, and the top end of the water inlet buffer tank 1 is flush with the top end of the main tank body 3b of the drain buffer tank 3 and is sealed and covered by a whole plate. The sub-tank 3c has a bottom plate of the wastewater treatment tank 2 as a ceiling plate and includes a skirt plate 3c1 connected to a bottom end of the wastewater treatment tank 2. The main body 3b includes a front barrier 3b1, a rear barrier 3b2, and a side barrier 3b3, one ends of the front barrier 3b1 and the rear barrier 3b2 are connected to the left or right side wall of the wastewater treatment tank 2, and the other ends of the front barrier 3b1 and the rear barrier 3b2 are connected to the side barrier 3b 3. The bottom ends of the auxiliary box body 3c and the main box body 3b are sealed through a whole plate, a water outlet communicated with the inner cavity of the auxiliary box body 3c is formed in the bottom plate of the wastewater treatment box 2, a communication port 3c2 communicated with the inner cavity of the main box body 3b is formed in the bottom of the enclosure baffle 3c1, and the drainage port 3a is formed in the top of the main box body 3 b. After adopting above-mentioned structure, whole effluent treatment plant's structure becomes compacter, and the volume is littleer, is favorable to saving space (the effluent treatment plant that can arrange in the unit space is more in quantity).

The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.

Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.

Claims (9)

1. Cr (VI) -containing wastewater treatment device based on electrode biofilm method is characterized in that: comprises a water inlet buffer tank (1), a wastewater treatment tank (2) and a drainage buffer tank (3) which are connected in sequence;

a plurality of reaction tanks (2 b) are formed in the wastewater treatment box (2) by dividing through partition plates (2 a) which are arranged in parallel from top to bottom at intervals, the partition plates (2 a) are made of conductive materials or electrode plates are laid on the upper surface and/or the lower surface of the partition plates, the reaction tanks (2 b) are sequentially connected from top to bottom through drainage notches (2 a 1) arranged at the front end and/or the rear end of the partition plates (2 a), a plurality of biofilm culturing core rods (4) which extend from front to back are horizontally arranged in the reaction tanks (2 b), the front end and the rear end of each biofilm culturing core rod (4) are respectively detachably connected with the front side wall and the rear side wall of the wastewater treatment box (2), each biofilm culturing core rod (4) comprises an electrode rod (4 a) and a vortex-shaped biofilm culturing plate (4 b) connected with the vortex electrode rod (4 a), the electrode rod (4 a) is positioned at the axis center of the vortex-shaped biofilm culturing plate (4 b), the spiral film hanging plate (4 b) is provided with water permeable holes (4 b 1) and a substrate for microorganisms to attach to form a film, a waste gas discharge pipe (5) is arranged in the wastewater treatment tank (2), the waste gas discharge pipe (5) penetrates through each reaction tank (2 b) and penetrates out of the top end of the wastewater treatment tank (2), a waste gas collecting port or a waste gas collecting hole (5 a) is formed in the side wall of the part, penetrating through the reaction tanks (2 b), of the waste gas discharge pipe (5), and waste gas in the reaction tanks (2 b) enters the waste gas discharge pipe (5) through the waste gas collecting port or the waste gas collecting hole (5 a) and is discharged from the top end of the waste gas discharge pipe.

2. The apparatus for treating wastewater containing Cr (VI) according to claim 1, wherein: the top of buffer tank (1) of intaking is equipped with into water interface (1 a), the top of drainage buffer tank (3) is equipped with drainage interface (3 a), the minimum of interface of intaking (1 a) and drainage interface (3 a) all is higher than the highest water storage position of waste water treatment case (2), the top of exhaust-gas discharge pipe (5) is higher than the highest water storage position of buffer tank (1) and drainage buffer tank (3) of intaking.

3. The apparatus for treating wastewater containing Cr (VI) according to claim 1, wherein: a plurality of mandrel positioning and mounting holes (2 c) are formed in the front side wall and the rear side wall of the wastewater treatment box (2), and mandrel positioning seats (6) are mounted in the mandrel positioning and mounting holes (2 c);

the mandrel positioning seat (6) comprises an end cover plate (6 a) and a convex ring (6 b) arranged on the end cover plate (6 a), the outer diameter of the convex ring (6 b) is matched with the aperture of a mandrel positioning installation hole (2 c), the inner diameter of the convex ring (6 b) is matched with the peripheral size of the spiral film-coated plate (4 b), an electrode rod positioning pin (6 c) is arranged at the center of an area surrounded by the convex ring (6 b), positioning holes (4 a 1) matched with the electrode rod positioning pin (6 c) are formed in the front end and the rear end of the electrode rod (4 a), the end cover plate (6 a) is positioned outside the wastewater treatment box (2) and is fixedly connected to the side wall of the wastewater treatment box (2) through bolts, the convex ring (6 b) is inserted into the mandrel positioning installation hole (2 c), the spiral film-coated plate (4 b) is inserted into a gap between the convex ring (6 b) and the electrode rod positioning pin (6 c), the electrode rod positioning pin (6 c) is inserted into the positioning hole (4 a 1) corresponding to the electrode rod (4 a).

4. The apparatus for treating wastewater containing Cr (VI) according to claim 3, wherein: the mandrel positioning seat (6) comprises a first mandrel positioning seat (6.1) arranged on the front side wall of the wastewater treatment box (2) and a second mandrel positioning seat (6.2) arranged on the rear side wall of the wastewater treatment box (2), the electrode rod positioning pins (6 c) of the first core rod positioning seat (6.1) and the second core rod positioning seat (6.2) are respectively provided with a guide hole (6 c 1) along the axial direction thereof, the guide hole (6 c 1) positioned on the second core rod positioning seat (6.2) penetrates through the end cover plate (6 a), a plug bolt (6 d) for plugging the corresponding guide hole (6 c 1) is detachably connected to the end cover plate (6 a) of the second core rod positioning seat (6.2), the positioning hole (4 a 1) formed in the electrode rod (4 a) axially penetrates through the whole electrode rod (4 a) and is coaxially aligned with the guide holes (6 c 1) in the first mandrel positioning seat (6.1) and the second mandrel positioning seat (6.2).

5. The apparatus for treating wastewater containing Cr (VI) according to claim 2, wherein: the utility model discloses a waste gas treatment device, including the waste water treatment box (2), the buffer tank that intakes (1) sets up in waste water treatment box (2) top, the roof of intake buffer tank (1) with waste water treatment box (2) is as the bottom plate, set up the water inlet with the inner chamber intercommunication of intake buffer tank (1) and waste water treatment box (2) on the roof of waste water treatment box (2), waste gas discharge pipe (5) pass and its top is higher than the highest water storage position of intake buffer tank (1) from intake buffer tank (1).

6. The apparatus for treating wastewater containing Cr (VI) according to claim 5, wherein: the drainage buffer tank (3) comprises a main tank body (3 b) arranged on the left side or the right side of the wastewater treatment tank (2) and an auxiliary tank body (3 c) arranged below the wastewater treatment tank (2), wherein the auxiliary tank body (3 c) takes the bottom plate of the wastewater treatment tank (2) as a top plate and comprises a surrounding baffle plate (3 c 1) connected with the bottom end of the wastewater treatment tank (2), the main tank body (3 b) comprises a front baffle plate (3 b 1), a rear baffle plate (3 b 2) and a side baffle plate (3 b 3), one ends of the front baffle plate (3 b 1) and the rear baffle plate (3 b 2) are connected with the left side wall or the right side wall of the wastewater treatment tank (2), the other ends of the front baffle plate (3 b 1) and the rear baffle plate (3 b 2) are connected with the side baffle plate (3 b 3), the bottom ends of the auxiliary tank body (3 c) and the main tank body (3 b) are sealed by a whole plate, and an auxiliary tank body (3 c) inner cavity communicated with the bottom plate of the wastewater treatment tank body (2) is arranged on the bottom plate, the bottom of the enclosure baffle (3 c 1) is provided with a communication port (3 c 2) communicated with the inner cavity of the main box body (3 b), and the drainage port (3 a) is arranged at the top of the main box body (3 b).

7. The apparatus for treating wastewater containing Cr (VI) according to claim 6, wherein: the top end of the water inlet buffer tank (1) is flush with the top end of the main tank body (3 b) of the water discharge buffer tank (3) and is sealed and covered by a whole plate.

8. The apparatus for treating Cr (VI) -containing wastewater according to any one of claims 1 to 4, wherein: the vortex-shaped film hanging plate (4 b) is a plastic plate, a flocking layer is formed on the surface of the plastic plate through flocking, and the flocking layer is used as a substrate for microorganisms to attach to form a film.

9. The apparatus for treating cr (vi) -containing wastewater according to claim 8, wherein: the electrode rod (4 a) and the electrode plate are respectively and correspondingly connected with the anode or the cathode of the direct-current stabilized power supply.

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