CN113277646A - Desulfurization wastewater integrated device and treatment process - Google Patents

Abstract

The invention relates to a desulfurization waste water integrated device, which comprises: the system comprises a desulfurization waste water raw water tank, a reaction tank, a settling zone, a filtering water inlet tank, a quartz sand filter, a clean water tank, a sludge dewatering system and a control system. The invention has the beneficial effects that: an inclined pipe group is arranged in the sedimentation area and used for enhancing the sedimentation effect, a material level detector is arranged in the stock bin and used for indicating the material level of the stock bin, and a safety valve is also arranged in the stock bin and used for preventing and controlling the over-pressure or under-pressure of the stock bin; a manhole is arranged on one side wall of the quartz sand filter and used for manually observing the internal condition of the quartz sand filter; the quality of the effluent treated by the desulfurization wastewater integrated device reaches the standard, and pollution indexes such as COD (chemical oxygen demand), heavy metals and the like can be effectively removed; under the condition of fluctuation of the quality of inlet water, the desulfurization wastewater integrated device can realize stable outlet water; the desulfurization wastewater integrated device effectively reduces the sludge production.

Description

Desulfurization wastewater integrated device and treatment process

Technical Field

The invention belongs to the field of desulfurization wastewater treatment, and particularly relates to a desulfurization wastewater integrated device and a treatment process.

Background

At present, the traditional treatment process adopted by the desulfurization wastewater of the thermal power plant is generally to discharge finally after neutralization, sedimentation, flocculation and clarification treatment; the main treatment equipment is a triple box and a clarifier, which is a desulfurization wastewater treatment process technology introduced from abroad more than twenty years ago; in the traditional process, during actual operation, system equipment is easy to block, the types of medicament storage and addition are multiple, more sludge is generated, the system is complex, the actual operation is unstable, the treatment effect is not ideal, and the like, so that the treatment of the coal-fired desulfurization wastewater is a headache. In order to better solve the problems brought by the traditional process and better serve the desulfurization wastewater treatment business of coal-fired power plants, the development of a desulfurization wastewater treatment process with ideal treatment effect, stable operation, investment saving, low operation cost, simple system and easy operation is urgently needed. Once the research and development is successful, the traditional process is rapidly replaced, and the method has a wide application market.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a desulfurization wastewater integrated device and a treatment process.

This kind of desulfurization waste water integrated device includes: the system comprises a desulfurization waste water raw water tank, a reaction tank, a settling zone, a filtering water inlet tank, a quartz sand filter, a clean water tank, a sludge dehydration system and a control system; the device comprises a water inlet pipe, a desulfurization waste water raw water tank, a reaction zone, a flocculation zone, a stirrer A, a perforated aeration pipe, a waste water lifting pump, a reaction tank inlet, a stirrer B, a perforated aeration pipe, a waste water outlet, a waste water lifting pump inlet, a waste water lifting pump outlet, a reaction tank inlet, a reaction zone and a flocculation zone, wherein the water inlet pipe is connected with the desulfurization waste water raw water tank; the reaction zone is provided with an automatic dry powder agent adding system; the water outlet of the flocculation zone is connected with the water inlet of the sedimentation zone, in order to enhance the sedimentation effect, an inclined pipe group is arranged in the sedimentation zone, the inclined pipe group comprises a plurality of inclined pipes, a support frame is arranged below the inclined pipe group, a flushing water inlet is connected with the water inlet at the bottom of the inclined pipe group in the sedimentation zone through a pipeline, the water outlet at the top of the inclined pipe group is connected with a desulphurization waste water raw water tank through a flushing water return pipe, the inclined pipe group is connected with a sludge discharge pump inlet, a sludge discharge pump outlet is connected with a sludge dewatering system inlet, and the water outlet of the sludge dewatering; the water outlet of the sedimentation zone is connected with the water inlet of the filtering water inlet pool; the water outlet of the filtering water inlet tank is connected with the water inlet of the filtering water pump; the water outlet of the filtered water pump is connected with the water inlet of the quartz sand filter; the water outlet of the quartz sand filter is connected with the water inlet of the clean water tank, the water outlet of the clean water tank is connected with the water inlet of the backwashing water pump, the water outlet of the backwashing water pump is connected with the water inlet at the bottom of the quartz sand filter, the positive washing water outlet at the bottom of the quartz sand filter is connected with the desulphurization waste water raw water tank through a backwashing water return pipe, and the backwashing water outlet at the top of the quartz sand filter is connected with the desulphurization waste water raw water tank through a backwashing water return pipe; the control system is electrically connected with a wastewater lifting pump, an automatic dry powder agent feeding system, a stirrer A, a stirrer B, a filtering water pump, a backwashing water pump, a sludge discharge pump and a sludge dewatering system.

Preferably, the specific structure of the automatic dry powder medicament adding system is as follows: the top of the automatic dry powder agent adding system is provided with a bin as a dry powder agent inlet; the automatic dry powder medicament adding system is internally divided into a first medicament dissolving box, a second medicament dissolving box and a storage box, and the first medicament dissolving box and the second medicament dissolving box are communicated with the top of the storage box; an electric control cabinet is also arranged on the automatic dry powder agent adding system; the upper half part of the storage bin is funnel-shaped, and the lower half part of the storage bin is a cylindrical body; a material level detector is arranged in the bin and used for indicating the material level of the bin, a safety valve is also arranged in the bin and used for preventing and controlling over-pressure or under-pressure of the bin, a vibrator and a spiral conveying rod; a feeding system water inlet and a heater are arranged on the left side wall of the first medicine dissolving box, the right side wall of the first medicine dissolving box is in contact with the left side wall of the second medicine dissolving box, a first stirring paddle is further arranged inside the first medicine dissolving box, and the first stirring paddle is electrically connected with a first driving motor; the right side wall of the second medicine dissolving box is in contact with the left side wall of the storage box, a second stirring paddle is arranged in the second medicine dissolving box, and the second stirring paddle is electrically connected with a second driving motor; a liquid level meter is arranged on the right side wall of the storage box, a water outlet pipe of the storage box is connected with a medicament adding pump, and the medicament adding pump is connected with a medicament adding inlet on the reaction tank; the material level detector, the safety valve, the vibrator, the spiral conveying rod, the heater, the first driving motor, the second driving motor, the liquid level meter and the medicament feeding pump are all electrically connected with the electric control cabinet.

Preferably, the specific structure of the quartz sand filter is as follows: the top of the quartz sand filter is provided with a filter water inlet, a flow baffle plate is arranged at a certain height below the filter water inlet, and two sides of the flow baffle plate are symmetrically fixed at two sides of the filter water inlet; two hoisting rings are symmetrically arranged at the top of the quartz sand filter; the top of the quartz sand filter is also provided with a vent pipe; a manhole is arranged on one side wall of the quartz sand filter and used for manually observing the internal condition of the quartz sand filter; a surface washing water inlet is arranged on the other side wall of the quartz sand filter; a plurality of sight glasses are arranged at different heights on the side wall of the quartz sand filter; a sewage interception layer is arranged at the middle lower part of the quartz sand filter, and a bearing layer is arranged below the sewage interception layer; two brackets are symmetrically arranged at the bottom of the quartz sand filter; the bottom of the quartz sand filter is also provided with a filter water outlet, an emptying valve and a discharge hole.

Preferably, the inclined tube group in the settling zone is made of ethylene propylene copolymer, and the support frame arranged below the inclined tube group is a rigid support welded by stainless steel.

Preferably, the level detector is a radar level gauge.

Preferably, two sight glasses are further arranged on the side wall of the quartz sand filter at different heights.

The treatment process of the desulfurization wastewater integrated device comprises the following steps:

s1, allowing inlet water to flow to the desulfurization waste water raw water tank along the water inlet pipe, and allowing a perforated aeration pipe arranged at the bottom of the desulfurization waste water raw water tank to form disturbance to obtain homogenized desulfurization waste water;

s2, enabling the homogenized desulfurization wastewater to pass through a reaction tank through a wastewater lift pump; the desulfurization wastewater inlet water quality fluctuates, according to inlet water quality parameters and engineering experience, the automatic dry powder agent adding system adjusts the adding amount of the dry powder agent according to the inlet water quality of the reaction tank, and adds the dry powder agent into a reaction area in the reaction tank, so that the desulfurization wastewater stably reaches the standard and is discharged;

s2.1, when a dry powder medicament automatic feeding system feeds medicaments, adding the dry powder medicament from a stock bin, and alarming when a high material level switch on a safety valve in the stock bin is at a high material level so as to prevent the stock bin from overflowing; conveying the dry powder medicament to a first medicament dissolving box through a spiral conveying rod; adding water into the first medicine dissolving box from a water inlet of the dosing system, heating the first medicine dissolving box through a heater arranged in the first medicine dissolving box while adding water, and stirring through a stirring paddle arranged in the first medicine dissolving box to accelerate the dissolution of the dry powder medicament in water;

s2.2, transferring the liquid dissolved with the dry powder medicament to a second dissolving box, and continuously stirring the liquid dissolved with the dry powder medicament by using a second stirring paddle arranged in the second dissolving box to obtain a dry powder medicament solution with a set concentration;

s2.3, transferring the dry powder medicament solution with the set concentration to a storage box for storage; the automatic dry powder agent adding system adds a dry powder agent solution with a set concentration into a reaction area of the reaction tank through an agent adding pump;

s3, enabling sewage flowing out of the flocculation area of the reaction tank to enter a precipitation area for precipitation, discharging sludge obtained through precipitation along an inclined pipe group, pressing the sludge into a sludge dewatering system through a sludge discharge pump, and enabling filtrate obtained after the sludge dewatering system dewaters the sludge to flow back to a desulfurization wastewater raw water tank through a filtrate return pipe;

s4, collecting sewage obtained after precipitation in the precipitation area through a water collecting tank, and then feeding the collected sewage into a filtering water inlet pool; the water discharged from the filtering water inlet tank is conveyed to a quartz sand filter by a filtering water pump for further filtering and then conveyed to a clean water tank; the quartz sand filter further reduces turbidity, and can effectively prevent the condition that the turbidity of the outlet water is increased due to overlarge alum blossom when the water quantity and the water quality fluctuate;

s4.1, washing the quartz sand filter with water according to the time set by the control system: washing the effluent of the filtering water inlet tank from the top to the bottom of the quartz sand filter by a filtering water pump to obtain forward washing water, and refluxing the forward washing water to the desulfurization wastewater raw water tank through a backwash water reflux pipe;

s4.2, carrying out water backwashing on the quartz sand filter according to the time set by the control system: the effluent of the clean water tank is washed from the bottom to the top of the quartz sand filter through a backwashing water pump to obtain backwashing water, and the backwashing water flows back to the desulfurization wastewater raw water tank through a backwashing water return pipe;

s5, backwashing is arranged on the inclined tube group (sludge pipeline) in the settling zone, a backwashing water source is process water, the process water is rewashed from the bottom to the top of the inclined tube group through a flushing water inlet so as to reduce the attachment of sludge on the wall of the inclined tube group, and the flushed water flows back to the desulfurization waste water raw water tank through a flushing water return pipe.

Preferably, the screw conveyor in step S2.1 has a weighing module.

Preferably, in step S2.1, the dry powder agent is a magnesium-based ecological water purifying agent, and the magnesium-based ecological water purifying agent is a compound with non-long-chain levorotatory ion polymerization degree; the magnesium-based ecological water purifying agent can replace organic sulfur, polymeric iron or polymeric aluminum, amide coagulants and polydimethyl diallyl ammonium chloride coagulants while treating the desulfurization wastewater; the ecological water purifying agent is added in a single medicine, so that the reaction is fast and the settling speed is fast; the sediment formed after treatment does not agglomerate; the dewatering property is good.

The invention has the beneficial effects that: an inclined pipe group is arranged in the sedimentation area and used for enhancing the sedimentation effect, a material level detector is arranged in the stock bin and used for indicating the material level of the stock bin, and a safety valve is also arranged in the stock bin and used for preventing and controlling the over-pressure or under-pressure of the stock bin; a manhole is arranged on one side wall of the quartz sand filter and used for manually observing the internal condition of the quartz sand filter; the quality of the effluent treated by the desulfurization wastewater integrated device reaches the standard, and pollution indexes such as COD (chemical oxygen demand), heavy metals and the like can be effectively removed; under the condition of fluctuation of the quality of inlet water, the desulfurization wastewater integrated device can realize stable outlet water; the desulfurization wastewater integrated device effectively reduces the sludge production.

Drawings

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a schematic structural view of a quartz sand filter;

fig. 3 is a schematic diagram of an automatic dry powder agent adding system.

Description of reference numerals: a water inlet pipe 1, a desulfurized wastewater raw water tank 2, a perforated aeration pipe 3, a wastewater lift pump 4, an automatic dry powder agent dosing system 5, a reaction tank 6, a stirrer A7, a stirrer B8, a settling zone 9, a filtration water inlet tank 10, a filtration water pump 11, a quartz sand filter 12, a clean water tank 13, a backwash water pump 14, a flushing water inlet 15, a sludge discharge pump 16, a filtrate return pipe 17, a backwash water return pipe 18, a flushing water return pipe 19, a sludge dewatering system 20, a control system 21, a filter water inlet 201, a filter water outlet 202, a blow-down valve 203, a discharge hole 204, a bracket 205, a sight glass 206, a surface flushing water inlet 207, a flow baffle 208, a manhole 209, a sewage interception layer 210, a hoisting ring 211, a blow-down pipe 212, a support layer 213, a first solvent tank 301, a second solvent tank 302, a storage tank 303, a first stirring paddle 304, a second stirring paddle 305, a first driving motor 306, a second driving motor 307, an electric control cabinet 308, a second stirring paddle 307, a second stirring paddle 305, a third stirring paddle, a fourth washing tank, a dosing system water inlet 309, a medicament dosing pump 310, a medicament dosing inlet 311, a storage bin 312, a vibrator 313, a spiral conveying rod 314, a liquid level meter 315, a material level detector 316 and a heater 317.

Detailed Description

The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for a person skilled in the art, several modifications can be made to the invention without departing from the principle of the invention, and these modifications and modifications also fall within the protection scope of the claims of the present invention.

Example one

The first embodiment of this application provides a desulfurization waste water integrated device, as shown in fig. 1, includes: the system comprises a desulfurization waste water raw water tank 2, a reaction tank 6, a settling zone 9, a filtering water inlet tank 10, a quartz sand filter 12, a clean water tank 13, a sludge dewatering system 20 and a control system 21; the device comprises a water inlet pipe 1, a desulfurization waste water raw water tank 2, a perforated aeration pipe 3 arranged at the bottom of the desulfurization waste water raw water tank 2, a water outlet of the desulfurization waste water raw water tank 2 connected with an inlet of a waste water lift pump 4, an outlet of the waste water lift pump 4 connected with an inlet of a reaction tank 6, the reaction tank 6 divided into a reaction zone and a flocculation zone, wherein the reaction zone is provided with a stirrer A7, and the flocculation zone is provided with a stirrer B8; the reaction area is provided with an automatic dry powder agent adding system 5; a water outlet of the flocculation zone is connected with a water inlet of the sedimentation zone 9, an inclined pipe group is arranged in the sedimentation zone 9, the inclined pipe group comprises a plurality of inclined pipes, a support frame is arranged below the inclined pipe group, a flushing water inlet 15 is connected with a water inlet at the bottom of the inclined pipe group in the sedimentation zone 9 through a pipeline, a water outlet at the top of the inclined pipe group is connected with a raw water pool 2 of the desulfurization waste water through a flushing water return pipe 19, the inclined pipe group is connected with an inlet of a sludge discharge pump 16, an outlet of the sludge discharge pump 16 is connected with an inlet of a sludge dewatering system 20, and a water outlet of the sludge dewatering system 20 is connected with the raw water pool 2 of the desulfurization waste water through a filtrate return pipe 17; the water outlet of the sedimentation zone 9 is connected with the water inlet of the filtering water inlet pool 10; the water outlet of the filtering water inlet tank 10 is connected with the water inlet of the filtering water pump 11; the water outlet of the filter water pump 11 is connected with the water inlet of the quartz sand filter 12; the water outlet of the quartz sand filter 12 is connected with the water inlet of a clean water tank 13, the water outlet of the clean water tank 13 is connected with the water inlet of a backwashing water pump 14, the water outlet of the backwashing water pump 14 is connected with the water inlet at the bottom of the quartz sand filter 12, the positive washing water outlet at the bottom of the quartz sand filter 12 is connected with the desulfurization waste water raw water tank 2 through a backwashing water return pipe 18, and the backwashing water outlet at the top of the quartz sand filter 12 is connected with the desulfurization waste water raw water tank 2 through a backwashing water return pipe 18; the control system 21 is electrically connected with the wastewater lifting pump 4, the automatic dry powder agent adding system 5, the stirrer A7, the stirrer B8, the filtering water pump 11, the backwashing water pump 14, the sludge discharge pump 16 and the sludge dewatering system 20. The control system 21 is an automatic treatment mode, can input sewage parameters collected by each signal source into the PLC, and can automatically adjust treatment parameters according to the change of sewage inlet parameters.

As shown in fig. 2, the specific structure of the quartz sand filter 12 is: the top of the quartz sand filter 12 is provided with a filter water inlet 201, a certain height position below the filter water inlet 201 is provided with a flow baffle plate 208, and two sides of the flow baffle plate 208 are symmetrically fixed on two sides of the filter water inlet 201; two hoisting rings 211 are symmetrically arranged at the top of the quartz sand filter 12; the top of the quartz sand filter 12 is also provided with an emptying pipe 212; a manhole 209 is arranged on one side wall of the quartz sand filter 12; a surface washing water inlet 207 is arranged on the other side wall of the quartz sand filter 12; a plurality of sight glasses 206 are arranged at different heights on the side wall of the quartz sand filter 12; the middle lower part of the quartz sand filter 12 is provided with a sewage interception layer 210, and a bearing layer 213 is arranged below the sewage interception layer 210; the bottom of the quartz sand filter 12 is symmetrically provided with two brackets 205; the bottom of the quartz sand filter 12 is also provided with a filter water outlet 202, an emptying valve 203 and a discharge hole 204.

As shown in fig. 3, the automatic dry powder agent adding system 5 has the following specific structure:

the top of the automatic dry powder agent adding system 5 is provided with a storage bin 312 as an inlet of the dry powder agent; the interior of the automatic dry powder medicament adding system 5 is divided into a first medicine dissolving box 301, a second medicine dissolving box 302 and a storage box 303, and the tops of the first medicine dissolving box 301, the second medicine dissolving box 302 and the storage box 303 are communicated; an electric control cabinet 308 is also arranged on the automatic dry powder agent adding system 5; the upper half part of the storage bin 312 is funnel-shaped, and the lower half part is a cylindrical body; a material level detector 316 is arranged in the bin 312, and a safety valve, a vibrator 313 and a spiral conveying rod 314 are also arranged in the bin 312; a feeding system water inlet 309 and a heater 317 are arranged on the left side wall of the first dissolved medicine box 301, the right side wall of the first dissolved medicine box 301 is in contact with the left side wall of the second dissolved medicine box 302, a first stirring paddle 304 is further arranged inside the first dissolved medicine box 301, and the first stirring paddle 304 is electrically connected with a first driving motor 306; the right side wall of the second medicine dissolving box 302 is in contact with the left side wall of the storage box 303, a second stirring paddle 305 is arranged in the second medicine dissolving box 302, and the second stirring paddle 305 is electrically connected with a second driving motor 307; a liquid level meter 315 is arranged on the right side wall of the storage tank 303, a water outlet pipe of the storage tank 303 is connected with a medicament adding pump 310, and the medicament adding pump 310 is connected with a medicament adding inlet 311 on the reaction tank 6; the material level detector 316, the safety valve, the vibrator 313, the spiral conveying rod 314, the heater 317, the first driving motor 306, the second driving motor 307, the liquid level meter 315 and the medicament feeding pump 310 are all electrically connected with the electric control cabinet 308.

Example two

On the basis of the first embodiment, the second embodiment of the application provides a treatment process of the desulfurization wastewater integrated device; the upstream end is water inlet 1, and the downstream end is clean water basin 13, and the influent water flows to desulfurization waste water former pond 2 along inlet tube 1, loops through reaction tank 6, settling zone 9, filtration intake pond 10 through waste water elevator pump 4, and the filtration water pump 11 is sent waste water to quartz sand filter 12 and is further filtered back to clean water basin 13. The settling zone 9 is provided with an inclined tube group settling zone, sludge is discharged from the lower end of the settling zone 9 and is pressed into a sludge dewatering system 20 through a sludge discharge pump 16, and filtrate flows back to the desulfurization wastewater raw water tank 2 along a filtrate return pipe 17.

The following describes a method for using the desulfurization wastewater integrated device in combination with a treatment process of the desulfurization wastewater integrated device.

a: desulfurization waste water is by water inlet 1 pipe says and gets into desulfurization waste water former pool 2, and 2 bottoms in desulfurization waste water former pool set up perforation aeration pipe 3, form disturbance homogeneity desulfurization waste water intake water quality of water after, carry to reaction tank 6 through waste water elevator pump 4.

b: the reaction tank 6 is divided into a reaction zone and a flocculation zone, and is respectively provided with a stirrer A7 and a stirrer B8; the muddy water enters the reaction area and then enters the flocculation area, so that the reaction and mixing speed is increased, and the treatment efficiency is comprehensively improved. The reaction zone is provided with an automatic dry powder agent adding system 5, and only one magnesium-based ecological water purifying agent is added into the reaction zone. During medicine adding, the dry powder medicament is added from the storage bin 312, conveyed to the first medicine dissolving box 301 through the spiral conveying rod 314 with the weighing function, and diluted by adding water through the water inlet 309 of the adding system to dissolve the dry powder medicament. The first dissolving box 301 is provided with a heater 317 and a first stirring paddle 304 to accelerate the dissolution of the dry powder medicament, the dry powder medicament is transported to the second dissolving box 302, and the medicament is prepared to a proper concentration through a second stirring paddle 305 and stored in a storage box 303. When the agent is added, the agent is added into the reaction tank 6 of the desulfurization wastewater integrated device by the agent adding pump 310. The ecological water purifying agent is added in a single medicine, the reaction is fast, and the settling speed is fast. A dry powder medicament feeder belt material level detector 316, a heater 317, a vibrator 313 and an electric control cabinet 308. The unloading and storing system is provided with a necessary powder material dust raising recovery system and a necessary powder concentration monitoring and alarming system, so that dust explosion is avoided, and the site safety and occupational health conditions are ensured. The bin 312 is provided with a radar level gauge for indicating the level of the bin, a safety valve is arranged for preventing the bin from being over-pressure or under-pressure, and a high level switch alarms when the level is high to prevent the bin from being over-loaded.

And c, precipitating the sewage in the precipitation zone 9, collecting the sewage by a water collecting tank, and then feeding the sewage into the filtering water inlet tank 10. In order to enhance the precipitation effect, an inclined tube group is arranged in the precipitation zone 9, and the material is ethylene propylene copolymer. The support frame arranged below the inclined tube is welded into a rigid support by 304 stainless steel. The design can further improve the precipitation condition, strengthen the precipitation effect and improve the speed of mud-water separation.

d: the quartz sand filter 12 is provided with a filter material layer: the size of the quartz sand of the dirt intercepting layer 210 is 0.5-1.0 mm, the height is 700mm, 2 layers of supporting layers 213 are arranged below the dirt intercepting layer, the filling height of 1-2 mm is 150-200 mm, and the filling height of 2-3 mm is 150-200 mm. The quartz sand filter 12 is provided with a water forward wash and a water reverse wash. The forward washing water source is the effluent of the filtering water inlet tank 10, the effluent is flushed from the top to the bottom of the quartz sand filter 12 through the water filtering pump 11, and the forward washing water flows back to the desulfurization waste water raw water tank 2. The water backwashing is to wash away impurities in water through the friction force of the quartz sand filter material and water scouring and the friction between sand and sand. The backwashing water source is the water discharged from the clean water tank 13, the water is flushed from the bottom to the top of the quartz sand filter 12 through a backwashing water pump, and the backwashing water flows back to the desulfurization wastewater raw water tank 2.

e: after the sludge is deposited in the settling zone 9, the sludge is discharged from the lower end of the settling zone 9 and is conveyed to a sludge dewatering system through a sludge discharge pump 16, and the filter pressing liquid flows back to the desulfurization wastewater raw water tank along a filtrate return pipe 17.

f: the washing water source of the sludge pipeline in the settling zone 9 is process water from the washing water inlet 15, the sludge pipeline is reversely washed so as to reduce the attachment of sludge on the pipeline wall, and the washed water flows back to the desulphurization raw water tank along the washing water return pipe 19.

g: the control system 21 is arranged, a PLC is arranged in the control system, the PLC is in signal connection with all electric equipment in the system, and the complete system runs in a full-automatic mode.

In the above description, the necessary accessories of pipes, valves, pumps, circuits of electronic devices, etc. between the various components are all conventional arrangements well known to those skilled in the art, and are all arranged according to actual needs.

The following table 1 shows the main water quality parameter comparison table for the water inlet and the water outlet of the desulfurization wastewater integrated device obtained in this example:

TABLE 1 comparison table of main water quality parameters of water inlet and water outlet of integrated desulfurization waste water device

Serial number	Item	Unit of	Water quality data (Water inlet)	Water quality data (Water outlet)
					1.	CODcr	mg/L	160	66
2.	Fluoride compounds	mg/L	23.8	6.05
					3.	Ammonia nitrogen	mg/L	30.0	7.86
4.	Mercury	μg/L	161	48
					5.	Arsenic (As)	μg/L	0.9	0.5
6.	Cadmium (Cd)	μg/L	442	80
					7.	Lead (II)	μg/L	2.8	2.4
8.	Nickel (II)	mg/L	0.91	0.42
					9.	Zinc	mg/L	0.86	0.10

To summarize:

the embodiment is applied to the treatment of desulfurization wastewater, and realizes the following functions in operation:

a: the effluent quality reaches the standard, and pollution indexes such as COD (chemical oxygen demand), heavy metals and the like can be effectively removed;

b: under the condition of fluctuation of the quality of inlet water, stable water outlet can be realized;

c: effectively reduces the sludge production.

The invention provides an integrated device treatment process applied to desulfurization wastewater, which can replace the traditional three-header and clarifier, namely, can eliminate a plurality of devices such as a three-header, a clarifier, a lime slurry dosing system, a flocculating agent dosing system, a coagulant aid dosing system, an organic sulfur dosing system, a hydrochloric acid dosing system and the like. The invention has the advantages of good effect, simple and convenient process and obvious economic benefit, and also reduces the investment cost, the operation and maintenance cost, the sludge amount and the energy consumption.

According to the invention, the magnesium-based ecological water purifying agent is added into a coagulation stirring area in the integrated treatment device, the magnesium-based ecological water purifying agent is fully chelated with heavy metal ions in the desulfurization wastewater after stirring, most suspended particles in the magnesium-based ecological water purifying agent are subjected to flocculation reaction and polymerized into clusters, and the desulfurization wastewater stably reaches the standard discharge of limestone-gypsum wet desulfurization wastewater quality control index of thermal power plants (DL/T997-2006) through adsorption, precipitation and filtration.

The embodiment is applied to the treatment of the desulfurization wastewater, and a triple box, a clarifier, a lime slurry dosing system, a flocculating agent dosing system, a coagulant aid dosing system, an organic sulfur dosing system, a hydrochloric acid dosing system and other devices are omitted. The process of the embodiment also reduces the investment cost, the operation and maintenance cost, the sludge amount and the energy consumption, has feasible technology, is economic and reasonable, and can be popularized and applied on a large scale.

Claims (9)

1. The utility model provides a desulfurization waste water integrated device which characterized in that includes: the system comprises a desulfurization waste water raw water tank (2), a reaction tank (6), a settling zone (9), a filtering water inlet tank (10), a quartz sand filter (12), a clean water tank (13), a sludge dewatering system (20) and a control system (21);

the device comprises a water inlet pipe (1), a desulfurization waste water raw water tank (2), a perforated aeration pipe (3) arranged at the bottom of the desulfurization waste water raw water tank (2), a water outlet of the desulfurization waste water raw water tank (2) is connected with an inlet of a waste water lift pump (4), an outlet of the waste water lift pump (4) is connected with an inlet of a reaction tank (6), the reaction tank (6) is divided into a reaction zone and a flocculation zone, the reaction zone is provided with a stirrer A (7), and the flocculation zone is provided with a stirrer B (8); the reaction zone is provided with an automatic dry powder medicament adding system (5); a water outlet of the flocculation zone is connected with a water inlet of the sedimentation zone (9), an inclined pipe group is arranged in the sedimentation zone (9), the inclined pipe group comprises a plurality of inclined pipes, a support frame is arranged below the inclined pipe group, a washing water inlet (15) is connected with a water inlet at the bottom of the inclined pipe group in the sedimentation zone (9) through a pipeline, a water outlet at the top of the inclined pipe group is connected with a desulfurization waste water raw water tank (2) through a washing water return pipe (19), the inclined pipe group is connected with an inlet of a sludge discharge pump (16), an outlet of the sludge discharge pump (16) is connected with an inlet of a sludge dewatering system (20), and a water outlet of the sludge dewatering system (20) is connected with the desulfurization waste water raw water tank (2) through a filtrate return pipe (17); the water outlet of the settling zone (9) is connected with the water inlet of the filtering water inlet pool (10); the water outlet of the filtering water inlet pool (10) is connected with the water inlet of the filtering water pump (11); the water outlet of the filtering water pump (11) is connected with the water inlet of the quartz sand filter (12); the water outlet of the quartz sand filter (12) is connected with the water inlet of the clean water tank (13), the water outlet of the clean water tank (13) is connected with the water inlet of the backwashing water pump (14), the water outlet of the backwashing water pump (14) is connected with the water inlet at the bottom of the quartz sand filter (12), the positive washing water outlet at the bottom of the quartz sand filter (12) is connected with the desulphurization waste water raw water tank (2) through a backwashing water return pipe (18), and the backwashing water outlet at the top of the quartz sand filter (12) is connected with the desulphurization waste water raw water tank (2) through the backwashing water return pipe (18);

the control system (21) is electrically connected with the wastewater lifting pump (4), the automatic dry powder agent adding system (5), the stirrer A (7), the stirrer B (8), the filtering water pump (11), the backwashing water pump (14), the sludge pump (16) and the sludge dewatering system (20).

2. The integrated desulfurization waste water device according to claim 1, wherein the automatic dry powder agent dosing system (5) has a specific structure that:

a storage bin (312) is arranged at the top of the automatic dry powder agent adding system (5) and is used as an inlet of the dry powder agent; the interior of the automatic dry powder medicament adding system (5) is divided into a first medicine dissolving box (301), a second medicine dissolving box (302) and a storage box (303), and the tops of the first medicine dissolving box (301), the second medicine dissolving box (302) and the storage box (303) are communicated; an electric control cabinet (308) is also arranged on the automatic dry powder agent adding system (5); the upper half part of the storage bin (312) is funnel-shaped, and the lower half part is a cylindrical body; a material level detector (316) is arranged in the bin (312), and a safety valve, a vibrator (313) and a spiral conveying rod (314) are also arranged in the bin (312); a feeding system water inlet (309) and a heater (317) are arranged on the left side wall of the first medicine dissolving box (301), the right side wall of the first medicine dissolving box (301) is in contact with the left side wall of the second medicine dissolving box (302), a first stirring paddle (304) is further arranged inside the first medicine dissolving box (301), and the first stirring paddle (304) is electrically connected with a first driving motor (306); the right side wall of the second medicine dissolving box (302) is in contact with the left side wall of the storage box (303), a second stirring paddle (305) is arranged in the second medicine dissolving box (302), and the second stirring paddle (305) is electrically connected with a second driving motor (307); a liquid level meter (315) is arranged on the right side wall of the storage box (303), a water outlet pipe of the storage box (303) is connected with a medicament adding pump (310), and the medicament adding pump (310) is connected with a medicament adding inlet (311) on the reaction tank (6); the material level detector (316), the safety valve, the vibrator (313), the spiral conveying rod (314), the heater (317), the driving motor I (306), the driving motor II (307), the liquid level meter (315) and the medicament feeding pump (310) are all electrically connected with the electric control cabinet (308).

3. The integrated desulfurization waste water device according to claim 1, wherein the quartz sand filter (12) has a specific structure:

the top of the quartz sand filter (12) is provided with a filter water inlet (201), a flow baffle plate (208) is arranged at a certain height below the filter water inlet (201), and two sides of the flow baffle plate (208) are symmetrically fixed at two sides of the filter water inlet (201); two hoisting rings (211) are symmetrically arranged at the top of the quartz sand filter (12); the top of the quartz sand filter (12) is also provided with a vent pipe (212); a manhole (209) is arranged on one side wall of the quartz sand filter (12); a surface washing water inlet (207) is arranged on the other side wall of the quartz sand filter (12); a plurality of sight glasses (206) are arranged at different heights on the side wall of the quartz sand filter (12); a sewage interception layer (210) is arranged at the middle lower part of the quartz sand filter (12), and a bearing layer (213) is arranged below the sewage interception layer (210); two brackets (205) are symmetrically arranged at the bottom of the quartz sand filter (12); the bottom of the quartz sand filter (12) is also provided with a filter water outlet (202), an emptying valve (203) and a discharge hole (204).

4. The desulfurization waste water integrated device of claim 1, wherein: the inclined tube group in the settling zone (9) is made of ethylene-propylene copolymer, and the support frame arranged below the inclined tube group is a rigid support welded by (304) stainless steel.

5. The desulfurization waste water integrated device of claim 2, wherein: the level detector (316) is a radar level gauge.

6. The desulfurization waste water integrated device of claim 3, wherein: two sight glasses (206) are arranged at different heights on the side wall of the quartz sand filter (12).

7. The treatment process of the desulfurization waste water integrated device according to claim 1, characterized by comprising the steps of:

s1, enabling inlet water to flow to the desulfurization waste water raw water tank (2) along the water inlet pipe (1), and enabling a perforated aeration pipe (3) arranged at the bottom of the desulfurization waste water raw water tank (2) to form disturbance to obtain homogenized desulfurization waste water;

s2, enabling the homogenized desulfurization wastewater to pass through a reaction tank (6) through a wastewater lift pump (4); the automatic dry powder agent adding system (5) adjusts the adding amount of the dry powder agent according to the water quality of the inlet water of the reaction tank (6), and adds the dry powder agent to the reaction area in the reaction tank (6);

s2.1, when a dry powder medicament automatic adding system (5) adds medicaments, adding the dry powder medicament from a stock bin (312), and alarming by a high material level switch on a safety valve in the stock bin (312) when the material level is high; conveying the dry powder medicament to a first medicament dissolving box (301) through a spiral conveying rod (314); adding water into the first medicine dissolving box (301) from a water inlet (309) of the adding system, heating the first medicine dissolving box (301) by a heater (317) arranged in the first medicine dissolving box (301) while adding water, and stirring by a stirring paddle (304) arranged in the first medicine dissolving box (301) to accelerate the dissolution of the dry powder medicine in water;

s2.2, transferring the liquid dissolved with the dry powder medicament to a second dissolving box (302), and continuously stirring the liquid dissolved with the dry powder medicament by using a second stirring paddle (305) arranged in the second dissolving box (302) to obtain a dry powder medicament solution with a set concentration;

s2.3, transferring the dry powder medicament solution with the set concentration to a storage box (303) for storage; a dry powder medicament automatic adding system (5) adds a dry powder medicament solution with a set concentration into a reaction area of a reaction tank (6) through a medicament adding pump (310);

s3, enabling sewage flowing out of a flocculation area of the reaction tank (6) to enter a precipitation area (9) for precipitation, discharging sludge obtained through precipitation along an inclined pipe set, pressing the sludge into a sludge dewatering system (20) through a sludge discharge pump (16), and enabling filtrate obtained after the sludge is dewatered by the sludge dewatering system (20) to flow back to the desulfurization wastewater raw water tank (2) through a filtrate return pipe (17);

s4, collecting sewage obtained after precipitation in the precipitation area (9) through a water collecting tank, and then feeding the collected sewage into a filtering water inlet pool (10); the effluent of the filtering water inlet pool (10) is sent to a quartz sand filter (12) through a filtering water pump (11) for further filtering and then is sent to a clean water pool (13);

s4.1, carrying out water forward washing on the quartz sand filter (12) according to the time set by the control system (21): washing the effluent of the filtering water inlet tank (10) from the top to the bottom of a quartz sand filter (12) through a filtering water pump (11) to obtain forward washing water, and refluxing the forward washing water to a desulfurization wastewater raw water tank (2) through a backwash water reflux pipe (18);

s4.2, carrying out water backwashing on the quartz sand filter (12) according to the time set by the control system (21): the effluent of the clean water tank (13) is washed from the bottom to the top of the quartz sand filter (12) through a backwashing water pump (14) to obtain backwashing water, and the backwashing water flows back to the desulfurization wastewater raw water tank (2) through a backwashing water return pipe (18);

s5, backwashing the inclined tube group of the settling area (9), wherein a backwashing water source is process water, the process water is rewashed from the bottom to the top of the inclined tube group through a flushing water inlet (15), and the flushed water flows back to the desulfurization waste water raw water tank (2) through a flushing water return pipe (19).

8. The treatment process of the desulfurization waste water integrated device according to claim 7, characterized in that: in step S2.1, the screw conveyor (314) has a weighing module.

9. The treatment process of the desulfurization waste water integrated device according to claim 7, characterized in that: in the step S2.1, the dry powder agent is a magnesium-based ecological water purifying agent which is a compound with non-long-chain levorotatory ion polymerization degree.

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