Novel advanced treatment device for aquaculture wastewater
Technical Field
The invention relates to a wastewater treatment device, in particular to a novel aquaculture wastewater advanced treatment device.
Background
The wastewater generated by livestock and poultry breeding mainly comprises urine, partial residual or all feces and feed residues (different feces cleaning modes), flushing water and a small amount of domestic sewage. The wastewater has high concentration of organic matters, high concentration of ammonia nitrogen, low carbon-nitrogen ratio, higher suspended matters and pathogenic bacteria, but better biodegradability. The prior commonly used livestock and poultry breeding wastewater treatment method mainly comprises an anaerobic biological treatment method, an aerobic biological treatment method and an aerobic-anaerobic mixed biological treatment method, the treated wastewater still has the problems of high chroma, peculiar smell and the like, and further needs to be subjected to advanced treatment.
The more common advanced treatment is ozone advanced oxidation, need to let in ozone in the waste water continuously, and make ozone and waste water fully react in order to improve the effect of waste water treatment, in order to improve ozone and the area of contact and the contact time of waste water, generally need make the ozone that enters into in the waste water divide into many small bubbles through the aeration dish, and the aeration dish is gone up the gas distribution board gas pocket and is smaller, ozone is cut into the bubble and is smaller, ozone is just bigger with the area of water contact, the effect of mixing is then better, however because there are many easily precipitated impurities in the waste water, the gas pocket is smaller on the gas distribution board, also is more easily blockked up by various impurity, cause ozone to get into the speed in the waste water and slow, reaction efficiency reduces.
For example, there is a "double check device for aeration plates" disclosed in chinese patent document CN2509179, which includes bubble holes, but has a disadvantage in that the bubble holes are small, and thus, if the bubble holes are used in a sewage treatment apparatus for a long time, the bubble holes are easily clogged, resulting in a decrease in efficiency of sewage treatment, and in order to avoid this, it is necessary to frequently maintain the sewage treatment apparatus and to remove or replace the clogged aeration plates.
Disclosure of Invention
The invention provides a novel aquaculture wastewater advanced treatment device, which aims to solve the problems that in the prior art, the aquaculture wastewater advanced treatment device needs frequent maintenance, and the blocked aeration disc is dredged or replaced, so that the maintenance cost is improved, and the treatment efficiency is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a novel aquaculture wastewater advanced treatment device which comprises a pretreatment area, a reaction area, an equipment control room, a pipeline system and an ozone generation system, wherein an aeration disc is arranged at the bottom of the pretreatment area and the reaction area, the ozone generation system is communicated with the aeration disc at the bottom of the reaction area, a plurality of circumferentially and uniformly distributed air distribution plates are arranged on the aeration disc, a rotating shaft is arranged on each air distribution plate, and a plurality of brushes for cleaning the surfaces of the air distribution plates are circumferentially and uniformly distributed on the rotating shaft.
The wastewater enters the pretreatment area during treatment, the chromaticity of the wastewater in the pretreatment area is reduced to a certain extent, but the required treatment effect is not achieved yet, after the pretreatment is finished in the pretreatment area, the wastewater enters the reaction area through the pipeline system, and the chromaticity of the wastewater entering the reaction area is reduced again, so that the better wastewater treatment effect is realized, and due to the staged treatment of the wastewater, the transfer speed of the wastewater is increased, the retention time at a certain position is reduced, and the deposition is reduced; in addition, through the pivoted brush on the gas distribution plate, can continuously clean the gas pocket on the gas distribution plate to directly avoid the deposit to block up the aeration dish, thereby improved the volume of the ozone that exposes to the sun on the aeration dish, improved waste water treatment's efficiency.
Preferably, the aeration disc is connected with an aeration pipe, an inner cavity is arranged in the aeration disc, the aeration pipe is provided with a vent hole for communicating the interior of the aeration pipe with the inner cavity, the bottom in the aeration pipe is provided with an anti-reflux valve body in a matched mode, and an anti-reflux air passage for communicating the top and the side face of the anti-reflux valve body is arranged in the anti-reflux valve body; the bottom of the anti-reflux valve body is provided with an elastic piece; the anti-reflux valve body can play a role in anti-reflux, and wastewater is prevented from entering the aeration trachea in a countercurrent manner when no ozone is introduced.
Preferably, the aeration disc comprises a fixed seat and a lifting cover arranged on the fixed seat, the inner cavity is formed by the part between the lifting cover and the fixed seat, an upper magnetic part is arranged on the lower side of the lifting cover, and a lower magnetic part opposite to the upper magnetic part is arranged on the fixed seat; because the existence of magnetic part, when no ozone passes through, under the magnetic force effect, the lift lid can with the fixing base laminating to strengthen the effect of preventing against current, when ozone passes through, the atmospheric pressure of production can rise the lift lid, thereby makes gas pass through the inner chamber.
Preferably, the lower part of the rotating shaft is provided with an external thread, and the fixed seat is provided with a threaded hole in threaded connection with the lower part of the rotating shaft; when the lift seat goes up and down, can drive the pivot goes up and down to make the pivot rotate in the screw hole, thereby make the brush clearance gas distribution plate surface, because among the aeration process, gaseous constantly through the gas distribution plate, be difficult to take place the deposit, the deposition process mainly takes place when not having ozone to lead in, and can clear up the gas distribution plate when ozone leads in at every turn through the structure in this scheme, thereby guaranteed the unobstructed of gas pocket, and the lift that has utilized the lift seat is accomplished, need not additionally to provide the power supply for the brush.
Preferably, a connecting seat is arranged between the air distribution plate and the rotating shaft, a thrust bearing is arranged between the connecting seat and the rotating shaft, and the thrust bearing can realize axial fixation of the air distribution plate and the rotating shaft, so that the brush can be ensured to be in contact with the surface of the air distribution plate all the time.
Preferably, the bottom of the fixed seat is provided with a bottom cover, and the bottom of the aeration air pipe is in contact with the bottom cover; when the bottom cover is disassembled, the installation of the backflow-preventing valve body, the elastic piece and other parts can be facilitated.
Preferably, the pipeline system comprises a gas collecting pipe, a communicating pipe, a water inlet pipe and a water outlet pipe, wherein the water inlet pipe is connected with the pretreatment region, the water outlet pipe is connected with the reaction region, and the communicating pipe is connected with the pretreatment region and the reaction region; one end of the gas collecting pipe is connected with the upper part of the reaction zone, and the other end of the gas collecting pipe is communicated with the aeration disc of the pretreatment zone; because ozone is not all mixed with waste water after discharging from the aeration dish, but have some to rise above the waste water liquid level, because ozone has certain toxicity, can not directly discharge, need carry out the subsequent processing of ozone through specific device among the prior art, and in this scheme, can get into the gas-collecting pipe after the ozone that does not mix completely with waste water rises, and ozone in the gas-collecting pipe can get into the aeration dish in the preliminary treatment district, thereby obtain the reuse, can improve the utilization ratio of ozone through this kind of method, and reduce the degree of difficulty of subsequent processing.
Preferably, the fixed seat of the aeration disc, the lifting cover and the aeration air pipe are made of stainless steel; the stainless steel material can be prevented from being oxidized by ozone.
Therefore, the invention has the following beneficial effects: (1) the surface of the air distribution plate can be automatically cleaned, so that the problem that the efficiency of wastewater treatment is reduced due to the blockage of air holes is avoided, and the maintenance cost is reduced; (2) no extra power is needed for cleaning the air distribution plate, so that the equipment structure is simple; (3) can improve the utilization rate of ozone and reduce the pollution to the environment.
Drawings
Fig. 1 is a schematic view of the internal structure of the present invention from a top view.
Fig. 2 is a schematic external structure view from a top view of the present invention.
FIG. 3 is a side view of a partial structure of the present invention.
Fig. 4 is a schematic structural diagram of the aeration disc in the ozone introducing state.
Fig. 5 is a schematic structural diagram of the aeration disc of the present invention in a state where ozone is not introduced.
Fig. 6 is a schematic top view of the aeration plate of the present invention.
In the figure: 1. the device comprises a pretreatment area 2, a reaction area 3, an equipment control room 4, a pipeline system 5, an ozone generation system 6, an aeration disc 7, a water inlet pipe 8, a water outlet pipe 9, a communicating pipe 10, an air inlet pipe 11, a gas collecting pipe 12, a return pipe 13, a water inlet valve 14, a water outlet valve 15, a communicating valve 16, an air inlet valve 17, a gas collecting valve 18, a spray head 19, an inspection manhole 20, a window 21, a movable cover plate 22, a magnetic pump 23, an aeration gas pipe 24, an inner cavity 25, a vent 26, an anti-backflow valve body 27, an anti-backflow gas passage 28, an elastic piece 29, a gas distribution plate 30, a rotating shaft 31, a brush 32, a fixed seat 33, a lifting cover 34, a side plate 35, a limiting plate 36, a pressure cavity 37.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
In the embodiment shown in fig. 1-6, the novel aquaculture wastewater advanced treatment device comprises a pretreatment zone 1, a reaction zone 2, an equipment control room 3, a pipeline system 4 and an ozone generation system 5, wherein the pipeline system passes through the equipment control room, and aeration discs 6 are arranged at the middle positions of the bottoms of the pretreatment zone and the reaction zone; the pipeline system comprises a water inlet pipe 7 for introducing wastewater into the device, a water outlet pipe 8 for discharging the treated wastewater, a communicating pipe 9 for communicating the reaction zone with the pretreatment zone, a gas inlet pipe 10 for communicating the ozone generating system with the aeration disc in the reaction zone, a gas collecting pipe 11 for communicating the upper part of the reaction zone with the aeration disc in the pretreatment zone, and a return pipe 12 for communicating the bottom of the reaction zone with the upper part of the reaction zone, the bottom of the pretreatment zone with the upper part of the pretreatment zone; a water inlet valve 13 is arranged on the water inlet pipe, a water outlet valve 14 is arranged on the water outlet pipe, and a communicating valve 15 is arranged on the communicating pipe; an air inlet valve 16 is arranged on the air inlet pipe, and a gas collecting valve 17 is arranged on the gas collecting pipe; the upper part of the return pipe is provided with a spray head 18; the top of the reaction zone is sealed by a cover plate, and the cover plate is provided with an inspection manhole 19 for inspection personnel to enter and a window 20 for observing the condition of the reaction zone; a movable cover plate 21 is arranged at the top of the pretreatment region; the pipeline system passes through the equipment control room, an electromagnetic flowmeter and a magnetic pump 22 are installed on the part of the pipeline system located in the equipment control room, and an exhaust fan is installed in the equipment control room.
When the device is operated, the water inlet valve and the communication valve are opened, wastewater enters the device through the water inlet pipe, the water inlet valve and the communication valve are closed after the wastewater reaches a proper liquid level, the air inlet valve is opened, the device starts aeration, unreacted ozone forms a gas collection area at the top of the reaction area due to the sealing of the reaction area, and when the residual ozone in the gas collection area is introduced into an aeration disc at the bottom of the pretreatment area through the gas collection pipe to a certain degree, so that the pretreatment area is aerated simultaneously, and the effects of consuming the residual ozone and pretreating the wastewater are achieved; when in aeration, the reflux pump is started, water at the bottoms of the pretreatment area and the reaction area can be respectively pumped to the top through the reflux pipe and sprayed to the water surface through the spray head, and the spraying and defoaming effects are achieved; after reacting for a period of time, opening the electromagnetic valve and the water outlet valve, and discharging the wastewater treated in the reaction zone through the water outlet pipe; the above operations of water inlet, aeration and water outlet are repeated, so that the equipment can continuously run. The wastewater in the pretreatment zone enters the reaction zone together with untreated wastewater after pretreatment, which is equivalent to diluting raw water, greatly reducing the treatment pressure and improving the treatment effect; and simultaneously, residual ozone is consumed, the ozone utilization rate is improved, and the treatment cost is reduced.
The aeration disc is connected with an aeration air pipe 23, an inner cavity 24 is arranged in the aeration disc, the aeration air pipe is provided with an air vent 25 for communicating the interior of the aeration air pipe with the inner cavity, the bottom in the aeration air pipe is provided with an anti-reflux valve body 26 in a matched mode, and an anti-reflux air passage 27 for communicating the top and the side face of the anti-reflux valve body is arranged in the anti-reflux valve body; the bottom of the anti-reflux valve body is provided with an elastic part 28; the aeration disc is provided with a plurality of circumferentially and uniformly distributed air distribution plates 29, the air distribution plates are formed by sintering industrial pure titanium powder serving as a main raw material at high temperature and high vacuum, each air distribution plate is provided with a rotating shaft 30, three brushes 31 for cleaning the surfaces of the air distribution plates are circumferentially and uniformly distributed and mounted on the rotating shaft, the air distribution plates are provided with three radial partition strips, and when the rotating shaft does not rotate, the brushes are respectively stopped on the three partition strips; the aeration disc comprises a fixed seat 32 and a lifting cover 33 arranged on the fixed seat, side plates 34 which are contacted with the outer edge of the lifting cover are arranged on the periphery of the fixed seat, and the upper parts of the side plates are connected with a limiting plate 35 used for limiting the lifting cover; the inner cavity is formed between the lifting cover and the fixed seat, a conical pressure cavity 36 is formed on one side of the lifting cover facing the aeration air pipe, a magnetic part 37 is embedded on the lower side of the lifting cover, and a lower magnetic part opposite to the upper magnetic part is embedded on the fixed seat; the lower part of the rotating shaft is provided with an external thread, and the fixed seat is provided with a threaded hole 38 in threaded connection with the lower part of the rotating shaft; a connecting seat 39 is arranged between the air distribution plate and the rotating shaft, and a thrust bearing 40 is arranged between the connecting seat and the rotating shaft; the bottom of the fixed seat is provided with a bottom cover 41, and the bottom of the aeration air pipe and the fixed seat of the aeration disc, the lifting cover and the aeration air pipe which are contacted with the bottom cover are all made of stainless steel.
When ozone starts to enter, the air pressure in the aeration air pipe is increased, the anti-backflow valve body is pressed downwards, so that the opening of the anti-backflow air passage at the side face of the anti-backflow valve body is communicated with the air vent, ozone enters the pressure cavity through the anti-backflow air passage and the air vent, and the ozone sprayed outwards pushes the lifting cover to move upwards and overcomes the magnetic force to separate the lifting cover from the bottom of the fixed seat; meanwhile, the air distribution plate and the rotating shaft also move upwards, and the rotating shaft rotates in the threaded hole while moving to drive the brush to scrape on the surface of the air distribution plate, so that the blocked air holes are cleaned; after the air cavity is filled with ozone, the air cavity generates larger atmospheric pressure, and the ozone can enter the wastewater through aeration from the air distribution plate to form a plurality of small bubbles; because the brush can finish the cleaning once when ozone is introduced every time, the waste water treatment efficiency cannot be influenced due to the blockage of the air distribution plate.