CN110655228A - Wastewater treatment process and system - Google Patents
Wastewater treatment process and system Download PDFInfo
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- CN110655228A CN110655228A CN201910819671.3A CN201910819671A CN110655228A CN 110655228 A CN110655228 A CN 110655228A CN 201910819671 A CN201910819671 A CN 201910819671A CN 110655228 A CN110655228 A CN 110655228A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
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Abstract
The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment process, which has the technical scheme that: the waste water is discharged to a horizontal sedimentation tank, a water sample is detected, the waste water flows into an adjusting tank, the adjusting tank is stirred by aeration and then flows into a coagulating sedimentation tank, then the waste water enters an intermediate water tank, the waste water enters a clean water tank after short time of staying, the waste water is discharged to an oxidation denitrification tank after reaching the standard by detection, the excessive discharge caused by water quality fluctuation is prevented, when the water quality of the clean water tank is found to be abnormal, the waste water is discharged to an accident tank, the waste water is gradually lifted to the adjusting tank for treatment after the accident is eliminated, and the effluent of the oxidation denitrification tank is discharged to the outside after reaching. According to the characteristics of the sintering desulfurization heavy metal wastewater, the invention systematically considers the removal method of pollutants such as heavy metal elements, COD, ammonia nitrogen and the like in the wastewater, and particularly has an obvious effect on removing thallium, the trace element with high treatment difficulty in the wastewater.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a wastewater treatment process and a wastewater treatment system.
Background
Research on thallium element removal technology is conducted at home and abroad, related treatment technology is provided for thallium-containing wastewater at home, but mature technology for sintering desulfurization thallium-containing heavy metal wastewater treatment is not available temporarily, the reason is that thallium-containing heavy metal wastewater is discharged only through wet desulfurization, the wastewater contains a large amount of salts, dust, heavy metals, ammonia nitrogen, COD (chemical oxygen demand) and the like, and the treatment difficulty of the wastewater is multiplied due to the interference of other substances. And the external discharge limit value of the thallium element is not very high in foreign standards, and related standards are provided only in recent two years in China, so that the mature process for treating the sintering desulfurization thallium-containing heavy metal wastewater is insufficient.
Aiming at the problems, the existing method only can remove heavy metals in wastewater, and does not remove ammonia nitrogen and COD.
The problems existing in the prior art are as follows: can not remove heavy metal thallium, ammonia nitrogen and COD in the wastewater at the same time.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a wastewater treatment process and a wastewater treatment system, which have the advantages that according to the characteristics of sintering desulfurization heavy metal wastewater, pollutants such as heavy metal elements, COD (chemical oxygen demand), ammonia nitrogen and the like in the wastewater are systematically considered, and particularly, the removal of thallium, the trace element with high treatment difficulty in the wastewater has a remarkable effect.
The technical purpose of the invention is realized by the following technical scheme: a wastewater treatment process is characterized in that:
the method comprises the following steps: measuring the pH value of water by a pH meter, judging whether the pH value needs to be adjusted according to data, adding lime, polyaluminium chloride and polyacrylamide to remove part of pollutants, adding the chemicals, and allowing the wastewater to flow to a precipitation section of a horizontal sedimentation tank for sludge-water separation;
step two: the effluent of the horizontal sedimentation tank flows into a regulating tank, and aeration stirring is adopted in the regulating tank;
step three: lifting the effluent of the regulating reservoir into a primary coagulation sedimentation tank, adding a special preparation for removing heavy metals into the primary coagulation sedimentation tank, allowing the effluent of the reaction section to enter the primary coagulation sedimentation tank for sludge-water separation, removing the heavy metals and part of suspended matters in the wastewater, allowing the effluent of the primary coagulation sedimentation tank to flow into a secondary coagulation sedimentation tank, adding a special agent for removing the heavy metals or other specific agents when the effluent quality of the primary coagulation sedimentation tank exceeds the standard, allowing the effluent to enter the secondary coagulation sedimentation tank, performing sludge-water separation, and removing the residual heavy metals and part of suspended matters in the wastewater;
step four: the effluent of the second-stage coagulation sedimentation tank automatically flows into an intermediate water tank, and enters a clean water tank after short-term retention, if the water inlet or the effluent quality of the clean water tank is abnormal, the abnormal wastewater is discharged to an accident tank, and the wastewater is gradually lifted to an adjusting tank for treatment after the accident is eliminated;
step five: and (3) introducing the effluent of the clean water tank into an oxidation denitrification tank, adding NaClO into the closed oxidation denitrification tank, using aeration stirring to oxidize and remove the residual ammonia nitrogen, CODCr and other reducing substances in the wastewater, and discharging the effluent of the oxidation denitrification tank after reaching the standard.
By adopting the technical scheme, pollutants such as heavy metal elements, COD, ammonia nitrogen, Tl and the like in the sintering desulfurization thallium-containing heavy metal wastewater can be removed, so that the pollutants reach the corresponding discharge standard.
In one embodiment: and in the first step, a first sludge suction scraper is used for periodically sucking sludge at the bottom of the sedimentation section, the sludge is lifted to a first sludge concentration tank through a first sludge pump, the sludge is temporarily stored in the first sludge concentration tank and then lifted to a first plate-and-frame filter press through a pump for dehydration, a sludge cake after dehydration is transported outwards for disposal, and filtrate flows back to the front end of the horizontal sedimentation tank for retreatment.
By adopting the technical scheme, mud and water are separated, mud is transported to the outside for disposal, and the residual wastewater is continuously treated.
In one embodiment: and in the first-stage coagulating sedimentation tank in the third step, a second sludge suction and scraping machine is used for periodically sucking sludge at the bottom of the sedimentation section and discharging the sludge to a second sludge concentration tank, the sludge is temporarily stored in the second sludge concentration tank and then lifted to a second plate-and-frame filter press by a pump for dehydration, sludge cakes after dehydration are transported and disposed, filtrate is discharged to a clean water tank when reaching the standard, and the filtrate is discharged to a horizontal flow sedimentation tank for retreatment when the index of the filtrate exceeds the standard.
By adopting the technical scheme, mud and water are separated, mud is transported to the outside for disposal, and the residual wastewater is continuously treated.
In one embodiment: and (3) periodically absorbing sludge at the bottom of the sedimentation section by using a third sludge absorbing and scraping machine in the second-stage coagulating sedimentation tank of the third step, discharging the sludge to a second sludge concentration tank, temporarily storing the sludge in the second sludge concentration tank, lifting the sludge to a second plate-and-frame filter press by using a pump for dehydration, transporting sludge cakes out after dehydration, discharging filtrate to a clean water tank when the filtrate reaches the standard, and discharging the filtrate to a horizontal sedimentation tank for retreatment when the filtrate index exceeds the standard.
By adopting the technical scheme, mud and water are separated, mud is transported to the outside for disposal, and the residual wastewater is continuously treated.
In one embodiment: and in the fourth step, in order to ensure that the thallium element in the effluent can stably reach the standard, the retention time of the clean water tank is 16 h.
By adopting the technical scheme, the reaction is carried out by utilizing enough time so as to ensure that the thallium element in the effluent can stably reach the standard
In one embodiment: and in the fifth step, a deodorizing spray tower is arranged on the side surface of the oxidation denitrification pool to treat odor generated when NaClO is excessive.
By adopting the technical scheme, the odor generated in the reaction process is treated by utilizing the deodorizing spray tower.
The invention also provides a wastewater treatment system which comprises a horizontal sedimentation tank, wherein the horizontal sedimentation tank is connected with a first sludge concentration tank and an adjusting tank, the adjusting tank is connected with a coagulating sedimentation tank, the coagulating sedimentation tank is connected with a second sludge concentration tank and an intermediate water tank, the intermediate water tank is connected with a clean water tank, and the clean water tank is connected with an oxidation denitrification tank.
By adopting the technical scheme, by using the method, pollutants such as heavy metal elements, COD, ammonia nitrogen, Tl and the like in the sintering desulfurization thallium-containing heavy metal wastewater can be effectively removed, so that the corresponding discharge standard is reached.
In one embodiment: the coagulating sedimentation tank comprises a primary coagulating sedimentation tank and a secondary coagulating sedimentation tank, the secondary coagulating sedimentation tank is connected with the second sludge concentration tank, the primary coagulating sedimentation tank and the secondary coagulating sedimentation tank are connected with the intermediate water tank, the regulating tank is connected with the primary coagulating sedimentation tank, and the primary coagulating sedimentation tank is connected with the secondary coagulating sedimentation tank.
Through adopting above-mentioned technical scheme, set up two-stage coagulating sedimentation tank, improve the waste water treatment effect.
In one embodiment: the clean water tank is also connected with an accident tank, and the accident tank is connected with the adjusting tank.
By adopting the technical scheme, when the water inlet or outlet quality of the clean water tank is found to be abnormal, the abnormal waste water is discharged to the accident tank, and the abnormal waste water is gradually lifted to the regulating tank for treatment after the accident is eliminated, so that the risk of excessive waste water discharge is effectively reduced.
In one embodiment: the oxidation deoxidation tank is also provided with a deodorization spray tower.
By adopting the technical scheme, the peculiar smell is removed by utilizing the deodorization spray tower.
In conclusion, the invention has the following beneficial effects:
firstly, pollutants such as heavy metal elements, COD, ammonia nitrogen, thallium and the like in the sintering desulfurization thallium-containing heavy metal wastewater can be removed, so that the pollutants reach corresponding discharge standards, the pollutant discharge is reduced, and the surrounding water environment is improved;
and secondly, the method has good environmental benefit and social benefit.
Drawings
FIG. 1 is a process flow diagram of a wastewater treatment process of this example.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
A wastewater treatment process comprising:
the method comprises the following steps: measuring the pH value of water by a pH meter, judging whether the pH value needs to be adjusted according to data, adding lime, polyaluminium chloride and polyacrylamide to remove part of pollutants, adding the chemicals, and allowing the wastewater to flow to a precipitation section of a horizontal sedimentation tank for sludge-water separation;
step two: the effluent of the horizontal sedimentation tank flows into a regulating tank, and aeration stirring is adopted in the regulating tank;
step three: lifting the effluent of the regulating reservoir into a primary coagulation sedimentation tank, adding a special preparation for removing heavy metals into the primary coagulation sedimentation tank, allowing the effluent of the reaction section to enter the primary coagulation sedimentation tank for sludge-water separation, removing the heavy metals and part of suspended matters in the wastewater, allowing the effluent of the primary coagulation sedimentation tank to flow into a secondary coagulation sedimentation tank, adding a special agent for removing the heavy metals or other specific agents when the effluent quality of the primary coagulation sedimentation tank exceeds the standard, allowing the effluent to enter the secondary coagulation sedimentation tank, performing sludge-water separation, and removing the residual heavy metals and part of suspended matters in the wastewater;
step four: the effluent of the second-stage coagulation sedimentation tank automatically flows into an intermediate water tank, and enters a clean water tank after short-term retention, if the water inlet or the effluent quality of the clean water tank is abnormal, the abnormal wastewater is discharged to an accident tank, and the wastewater is gradually lifted to an adjusting tank for treatment after the accident is eliminated;
step five: and (3) introducing the effluent of the clean water tank into an oxidation denitrification tank, adding NaClO into the closed oxidation denitrification tank, using aeration stirring to oxidize and remove the residual ammonia nitrogen, CODCr and other reducing substances in the wastewater, and discharging the effluent of the oxidation denitrification tank after reaching the standard.
By adopting the technical scheme, pollutants such as heavy metal elements, COD, ammonia nitrogen, Tl and the like in the sintering desulfurization thallium-containing heavy metal wastewater can be removed, so that the pollutants reach the corresponding discharge standard.
In the first step, a first sludge suction scraper is used for periodically sucking sludge at the bottom of the sedimentation section, the sludge is lifted to a first sludge concentration tank through a first sludge pump, the sludge is temporarily stored in the first sludge concentration tank and then lifted to a first plate-and-frame filter press through the pump for dehydration, a sludge cake after dehydration is transported outwards for disposal, and filtrate flows back to the front end of the horizontal sedimentation tank for retreatment.
By adopting the technical scheme, mud and water are separated, mud is transported to the outside for disposal, and the residual wastewater is continuously treated.
And in the first-stage coagulating sedimentation tank in the third step, a second sludge suction and scraping machine is used for periodically sucking sludge at the bottom of the sedimentation section and discharging the sludge to a second sludge concentration tank, the sludge is temporarily stored in the second sludge concentration tank and then lifted to a second plate-and-frame filter press by a pump for dehydration, sludge cakes after dehydration are transported and disposed, filtrate is discharged to a clean water tank when reaching the standard, and the filtrate is discharged to a horizontal flow sedimentation tank for retreatment when the index of the filtrate exceeds the standard.
By adopting the technical scheme, mud and water are separated, mud is transported to the outside for disposal, and the residual wastewater is continuously treated.
And (3) periodically absorbing sludge at the bottom of the sedimentation section by using a third sludge absorbing and scraping machine in the second-stage coagulating sedimentation tank, discharging the sludge to a second sludge concentration tank, temporarily storing the sludge in the second sludge concentration tank, lifting the sludge to a second plate-and-frame filter press by using a pump for dehydration, transporting a dehydrated sludge cake outwards, discharging the filtrate to a clean water tank when the filtrate reaches the standard, and discharging the filtrate to a horizontal sedimentation tank for retreatment when the filtrate index exceeds the standard.
By adopting the technical scheme, mud and water are separated, mud is transported to the outside for disposal, and the residual wastewater is continuously treated.
And in the fourth step, in order to ensure that the thallium element in the effluent can stably reach the standard, the retention time of the clean water tank is 16 h.
By adopting the technical scheme, the reaction is carried out by utilizing enough time so as to ensure that the thallium element in the effluent can stably reach the standard
And in the fifth step, a deodorizing spray tower is arranged on the side surface of the oxidation denitrification pool to treat odor generated when NaClO is excessive.
By adopting the technical scheme, the odor generated in the reaction process is treated by utilizing the deodorizing spray tower.
The invention also provides a wastewater treatment system which comprises a horizontal sedimentation tank, wherein the horizontal sedimentation tank is connected with a first sludge concentration tank and an adjusting tank, the adjusting tank is connected with a coagulating sedimentation tank, the coagulating sedimentation tank is connected with a second sludge concentration tank and an intermediate water tank, the intermediate water tank is connected with a clean water tank, and the clean water tank is connected with an oxidation denitrification tank.
By adopting the technical scheme, by using the method, pollutants such as heavy metal elements, COD, ammonia nitrogen, Tl and the like in the sintering desulfurization thallium-containing heavy metal wastewater can be effectively removed, so that the corresponding discharge standard is reached.
The coagulating sedimentation tank comprises a first-stage coagulating sedimentation tank and a second-stage coagulating sedimentation tank, the second sludge concentration tank is connected with the first-stage coagulating sedimentation tank and the second-stage coagulating sedimentation tank, the intermediate water tank is connected with the second-stage coagulating sedimentation tank, the adjusting tank is connected with the first-stage coagulating sedimentation tank, and the first-stage coagulating sedimentation tank is connected with the second-stage coagulating sedimentation tank.
Through adopting above-mentioned technical scheme, set up two-stage coagulating sedimentation tank, improve the waste water treatment effect.
The clean water tank is also connected with an accident tank, and the accident tank is connected with the adjusting tank.
By adopting the technical scheme, when the water inlet or outlet quality of the clean water tank is found to be abnormal, the abnormal waste water is discharged to the accident tank, and the abnormal waste water is gradually lifted to the regulating tank for treatment after the accident is eliminated, so that the risk of excessive waste water discharge is effectively reduced.
The implementation principle of the embodiment is as follows: and pumping the sintering desulfurization thallium-containing heavy metal wastewater to a horizontal flow sedimentation tank. The horizontal flow sedimentation tank comprises a reaction section and a sedimentation section. Considering that the fluctuation of the inlet water quality of the project is large, when the inlet water quality is poor and the pH is low, lime, PAC and PAM are added to remove partial pollutants and reduce the treatment load of the subsequent process. And large-particle substances such as crystals, silt and the like in the wastewater are removed by precipitation in the precipitation section so as to protect equipment such as a subsequent water pump and the like.
The effluent of the horizontal sedimentation tank automatically flows into a regulating tank, aeration stirring is adopted in the regulating tank, and partial sulfite ions in the wastewater are oxidized at the same time, so that the aim of reducing partial CODCr is fulfilled.
The effluent of the regulating tank is lifted to enter a primary coagulation sedimentation tank, the primary coagulation sedimentation tank is provided with a reaction tank I, a reaction tank II, a reaction tank III and a reaction tank IV, and special preparations for removing heavy metals are respectively added into the reaction tanks. And (4) enabling the effluent of the reaction section to enter a primary coagulation sedimentation tank for mud-water separation to remove heavy metals in the wastewater. And the effluent enters a second-stage coagulating sedimentation tank, the second-stage coagulating sedimentation tank is also provided with a first reaction tank, a second reaction tank, a third reaction tank and a fourth reaction tank, when the water quality of the effluent of the first-stage coagulating sedimentation tank exceeds the standard, a special medicament for removing heavy metals or other targeted medicaments are added, the effluent of the reaction section enters the second-stage coagulating sedimentation tank, the mud and water are separated, and the residual heavy metals in the wastewater are removed. The effluent of the second-stage coagulating sedimentation tank automatically flows into a clean water tank.
Because the waste water contains a large amount of reducing substances such as magnesium sulfite and the like, the CODCr in the waste water is still higher after coagulation, and the clear water tank adopts aeration oxidation to continuously reduce the CODCr in the waste water. In order to ensure that the thallium element in the effluent can stably reach the standard, the retention time of the clean water tank is 16h, and the effluent is discharged to the denitrification oxidation tank after reaching the standard through detection so as to prevent the overproof discharge caused by water quality fluctuation. When the water inflow or the water outflow of the clean water tank is abnormal, the wastewater is discharged to the accident tank, and is gradually lifted to the regulating tank for treatment after the accident is eliminated.
And (3) lifting the effluent of the clean water tank into a denitrification oxidation tank, adding NaClO into the sealed denitrification oxidation tank, using aeration stirring to oxidize and remove residual ammonia nitrogen, CODCr and other reducing substances in the wastewater, and installing a deodorization tower on the side surface of the denitrification oxidation tank to treat odor generated when excessive NaClO is generated. And discharging the effluent of the denitrification oxidation tank after reaching the standard.
The sludge in the horizontal sedimentation tank is lifted to a first sludge concentration tank by a first sludge pump, temporarily stored in the first sludge concentration tank and lifted to a first plate and frame filter press by a pump for dehydration. And (5) carrying out outward transportation and disposal on the dewatered mud cakes. And (5) refluxing the filtrate to a water collecting tank for treatment. And the sludge in the coagulating sedimentation tank is lifted to a second sludge concentration tank by a second sludge pump, temporarily stored in the second sludge concentration tank and lifted to a diaphragm second plate-and-frame filter press by the pump for dehydration. And (5) carrying out outward transportation and disposal on the dewatered mud cakes. And discharging the filtrate to a clean water tank, and discharging the filtrate to a water collecting tank for treatment when the heavy metal in the filtrate exceeds the standard.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A wastewater treatment process, characterized by comprising:
the method comprises the following steps: measuring the pH value of water by a pH meter, judging whether the pH value needs to be adjusted according to data, adding lime, polyaluminium chloride and polyacrylamide to remove part of pollutants, adding the chemicals, and allowing the wastewater to flow to a precipitation section of a horizontal sedimentation tank for sludge-water separation;
step two: the effluent of the horizontal sedimentation tank flows into a regulating tank, and aeration stirring is adopted in the regulating tank;
step three: lifting the effluent of the regulating reservoir into a primary coagulation sedimentation tank, adding a special preparation for removing heavy metals into the primary coagulation sedimentation tank, allowing the effluent of the reaction section to enter the primary coagulation sedimentation tank for sludge-water separation, removing the heavy metals and part of suspended matters in the wastewater, allowing the effluent of the primary coagulation sedimentation tank to flow into a secondary coagulation sedimentation tank, adding a special agent for removing the heavy metals or other specific agents when the effluent quality of the primary coagulation sedimentation tank exceeds the standard, allowing the effluent to enter the secondary coagulation sedimentation tank, performing sludge-water separation, and removing the residual heavy metals and part of suspended matters in the wastewater;
step four: the effluent of the second-stage coagulation sedimentation tank automatically flows into an intermediate water tank, and enters a clean water tank after short-term retention, if the water inlet or the effluent quality of the clean water tank is abnormal, the abnormal wastewater is discharged to an accident tank, and the wastewater is gradually lifted to an adjusting tank for treatment after the accident is eliminated;
step five: and (3) introducing the effluent of the clean water tank into an oxidation denitrification tank, adding NaClO into the closed oxidation denitrification tank, using aeration stirring to oxidize and remove the residual ammonia nitrogen, CODCr and other reducing substances in the wastewater, and discharging the effluent of the oxidation denitrification tank after reaching the standard.
2. The wastewater treatment process according to claim 1, characterized in that: and in the first step, a first sludge suction scraper is used for periodically sucking sludge at the bottom of the sedimentation section, the sludge is lifted to a first sludge concentration tank through a first sludge pump, the sludge is temporarily stored in the first sludge concentration tank and then lifted to a first plate-and-frame filter press through a pump for dehydration, a sludge cake after dehydration is transported outwards for disposal, and filtrate flows back to the front end of the horizontal sedimentation tank for retreatment.
3. The wastewater treatment process according to claim 1, characterized in that: and in the first-stage coagulating sedimentation tank in the third step, a second sludge suction and scraping machine is used for periodically sucking sludge at the bottom of the sedimentation section and discharging the sludge to a second sludge concentration tank, the sludge is temporarily stored in the second sludge concentration tank and then lifted to a second plate-and-frame filter press by a pump for dehydration, sludge cakes after dehydration are transported and disposed, filtrate is discharged to a clean water tank when reaching the standard, and the filtrate is discharged to a horizontal flow sedimentation tank for retreatment when the index of the filtrate exceeds the standard.
4. The wastewater treatment process according to claim 1, characterized in that: and (3) periodically absorbing sludge at the bottom of the sedimentation section by using a third sludge absorbing and scraping machine in the second-stage coagulating sedimentation tank of the third step, discharging the sludge to a second sludge concentration tank, temporarily storing the sludge in the second sludge concentration tank, lifting the sludge to a second plate-and-frame filter press by using a pump for dehydration, transporting sludge cakes out after dehydration, discharging filtrate to a clean water tank when the filtrate reaches the standard, and discharging the filtrate to a horizontal sedimentation tank for retreatment when the filtrate index exceeds the standard.
5. The wastewater treatment process according to claim 1, characterized in that: and in the fourth step, in order to ensure that the thallium element in the effluent can stably reach the standard, the retention time of the clean water tank is 16 h.
6. The wastewater treatment process according to claim 1, characterized in that: and in the fifth step, a deodorizing spray tower is arranged on the side surface of the oxidation denitrification pool to treat odor generated when NaClO is excessive.
7. The utility model provides a wastewater treatment system, includes the advection sedimentation tank which characterized in that: the horizontal sedimentation tank is connected with a first sludge concentration tank and an adjusting tank, the adjusting tank is connected with a coagulating sedimentation tank, the coagulating sedimentation tank is connected with a second sludge concentration tank and an intermediate water tank, the intermediate water tank is connected with a clean water tank, and the clean water tank is connected with an oxidation denitrification tank.
8. The wastewater treatment system according to claim 7, wherein: the coagulating sedimentation tank comprises a primary coagulating sedimentation tank and a secondary coagulating sedimentation tank, the secondary coagulating sedimentation tank is connected with the second sludge concentration tank, the primary coagulating sedimentation tank and the secondary coagulating sedimentation tank are connected with the intermediate water tank, the regulating tank is connected with the primary coagulating sedimentation tank, and the primary coagulating sedimentation tank is connected with the secondary coagulating sedimentation tank.
9. The wastewater treatment system according to claim 7, wherein: the clean water tank is also connected with an accident tank, and the accident tank is connected with the adjusting tank.
10. The wastewater treatment system according to claim 7, wherein: the oxidation deoxidation tank is also provided with a deodorization spray tower.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111233127A (en) * | 2020-03-12 | 2020-06-05 | 爱土工程环境科技有限公司 | Acid mine wastewater treatment process and system |
| CN112062378A (en) * | 2020-09-23 | 2020-12-11 | 大唐环境产业集团股份有限公司 | Sintering flue gas desulfurization wastewater zero-discharge treatment system and method |
| CN113582424A (en) * | 2021-08-13 | 2021-11-02 | 南通大恒环境工程有限公司 | Method for treating fixation fluid wastewater after silver extraction |
| CN113603271A (en) * | 2021-09-08 | 2021-11-05 | 云南省生态环境科学研究院 | Treatment method of heavy metal and nitrogen-phosphorus composite polluted water body |
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| CN113582424A (en) * | 2021-08-13 | 2021-11-02 | 南通大恒环境工程有限公司 | Method for treating fixation fluid wastewater after silver extraction |
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