CN216837539U - Advanced pretreatment system for steel comprehensive wastewater - Google Patents
Advanced pretreatment system for steel comprehensive wastewater Download PDFInfo
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- CN216837539U CN216837539U CN202122931186.0U CN202122931186U CN216837539U CN 216837539 U CN216837539 U CN 216837539U CN 202122931186 U CN202122931186 U CN 202122931186U CN 216837539 U CN216837539 U CN 216837539U
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Abstract
The utility model discloses a steel comprehensive wastewater advanced pretreatment system, which comprises a regulating tank, a reaction tank, a sedimentation tank, a sand filter, an ozone oxidation tower, an aeration biological filter, a denitrification filter and a middle water tank, wherein the regulating tank is connected with the reaction tank through a pipeline; the regulating tank is communicated with the reaction tank through a pipeline; an overflow port of the reaction tank is communicated with the sedimentation tank; an upper water outlet channel of the sedimentation tank is communicated with a sand filter which is communicated with an ozone oxidation tower through a pipeline; the water outlet of the ozone oxidation tower is communicated with the biological aerated filter through a pipeline, the biological aerated filter is communicated with the denitrification filter through a pipeline, and the denitrification filter is communicated with the middle water tank through a pipeline; the middle water tank is respectively communicated with the sand filter, the ozone oxidation tower, the biological aerated filter and the denitrification filter through pipelines. The temporary hardness of the produced water is less than or equal to 50mg/L, CODcr and less than or equal to 30mg/L, the ammonia nitrogen is less than or equal to 2mg/L, and the oil is less than or equal to 1mg/L, so that the service cycle of the membrane is effectively prolonged, and the membrane is prevented from being frequently cleaned; has the characteristics of good treatment effect, cleanness, environmental protection and the like.
Description
Technical Field
The utility model relates to a wastewater treatment system, in particular to a steel comprehensive wastewater advanced pretreatment system.
Background
The iron and steel enterprises are large water consuming and draining households, meet the requirements of environmental protection and discharge, improve the recycling rate of the waste water, realize the resource utilization of the waste water, achieve the aim of reducing discharge, save water and reduce the water cost. The initial technology of wastewater treatment only carries out simple materialization and filtration treatment on wastewater for recycling, the quality of reuse water only can meet the water replenishing requirement of a process unit with low requirement, the wastewater is subjected to advanced treatment to improve the quality of produced water and meet the water replenishing requirement of more process units, and a foundation is laid for improving the recycling rate of the wastewater.
The advanced treatment is carried out on the steel industry wastewater by adopting a membrane separation technology, so that organic matters, chromaticity, hardness and most ions in the wastewater can be effectively removed; the produced water can replace softened water prepared by the traditional ion exchange process and even can meet the requirement of boiler water. In order to reduce the pollution, scaling, microbial corrosion, hydrolysis, oxidation, high-temperature deterioration and the like which may occur in the use process of the membrane separation device and ensure the long-term stable operation of the membrane separation device, the inlet water of the membrane separation device needs to be strictly pretreated. Different water sources and different pretreatment methods are adopted, and various water treatment units are organically combined aiming at different water sources to form a technically feasible and economically feasible pretreatment system.
The source of the steel comprehensive wastewater is production drainage of each process of a steel mill and domestic drainage of each office area, and the water quality and the components of a water source are complex and various and greatly change along with fluctuation of water volume; therefore, a pretreatment system for advanced treatment of the comprehensive steel wastewater is developed, the pollution speed of the membrane separation device is controlled within a reasonable limit, the service cycle of the membrane is prolonged, and frequent cleaning is avoided; the method not only can improve the reuse rate of the wastewater to the maximum extent and reduce the influence of the wastewater discharge on the environment, but also can reduce the consumption of new water through the resource utilization of the wastewater, thereby increasing the benefit growth point for enterprise development, and the development and the application of the technology have very important significance.
Summary of the utility model
The utility model aims to provide a steel comprehensive wastewater advanced pretreatment system to effectively reduce the concentration of pollutants in wastewater.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: which comprises a regulating tank, a reaction tank, a sedimentation tank, a sand filter, an ozone oxidation tower, an aeration biological filter, a denitrification filter and an intermediate water tank; the regulating tank is communicated with the reaction tank through a pipeline; an overflow port of the reaction tank is communicated with the sedimentation tank; the upper water outlet channel of the sedimentation tank is communicated with a sand filter which is communicated with an ozone oxidation tower through a pipeline; the water outlet of the ozone oxidation tower is communicated with the biological aerated filter through a pipeline, the biological aerated filter is communicated with the denitrification filter through a pipeline, and the denitrification filter is communicated with the intermediate water tank through a pipeline; the middle water tank is respectively communicated with the sand filter, the ozone oxidation tower, the biological aerated filter and the denitrification filter through pipelines.
The reaction tank is a two-stage reaction tank; the first-stage reaction tank is provided with a sodium hydroxide metering pump and a sodium carbonate metering pump, and the second-stage reaction tank is provided with a PFS metering pump and a PAM metering pump.
The sedimentation tank is an inclined plate sedimentation tank.
The aeration biological filter is a single-stage biological filter.
A lifting pump is arranged on a pipeline between the regulating tank and the reaction tank.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the utility model makes Ca in the wastewater2+、Mg2+Separating out ions and other heavy metal ions to separate out cyanogen-containing substances and form large particles under the action of a flocculating agent, and removing most suspended matters by using a sedimentation tank; then further removing fine suspended matters through a sand filter, and realizing security filtration of the ozone catalytic oxidation process; the catalytic ozonation process oxidizes macromolecular refractory organics in the wastewater into micromolecular substances, and even directly degrades the macromolecular refractory organics into CO2And H2O; the effluent passes through the aeration biological filter and the denitrification filter to finally realize the deep removal of pollutants such as total nitrogen, COD, polycyclic aromatic hydrocarbon and the like. The utility model integrates the technologies of high-efficiency decyanation coagulation, total nitrogen removal, ozone oxidation and softening to form a pretreatment technology for the advanced treatment of the comprehensive wastewater of steel. The temporary hardness (calculated by calcium carbonate) of the produced water is less than or equal to 50mg/L, CODcr and less than or equal to 30mg/L, the ammonia nitrogen is less than or equal to 2mg/L, the oil is less than or equal to 1mg/L, and the concentration of pollutants is reduced to a lower level, so that the pollution speed of a subsequent membrane separation device is controlled within a reasonable limit, the service cycle of the membrane is effectively prolonged, and the frequent cleaning of the membrane is avoided; the utility model has the characteristics of good treatment effect, cleanness, environmental protection and the like.
Drawings
The utility model is described in further detail below with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of the present invention.
In the figure: an adjusting tank 1, a lift pump 2, a primary reaction tank 3, a secondary reaction tank 4, a sedimentation tank 5, a sand filter 6, a stirrer 7, an ozone oxidation tower 8, an aeration biological filter 9, a denitrification filter 10, an intermediate water tank 11 and a backwashing pump 12.
Detailed Description
As shown in figure 1, the steel comprehensive wastewater advanced pretreatment system comprises a regulating tank 1, a reaction tank, a sedimentation tank 5, a sand filter 6, an ozone oxidation tower 8, an aeration biological filter 9, a denitrification filter 10 and an intermediate water tank 11; the details are as follows:
(1) adjusting pool 1: the steel comprehensive wastewater firstly enters the regulating tank 1, the regulating tank has the functions of reducing flow fluctuation, homogenizing the sewage to be treated and minimizing the flow and water quality change of downstream treatment. The change of the water quantity and the pollutant concentration entering the subsequent process cannot be sudden impact change, but can be continuous change, namely the change of the water quantity and the pollutant concentration within one hour cannot exceed 10% of the average water inlet flow and the pollutant concentration, and an underwater stirrer is arranged in the adjusting tank 1 to prevent suspended matters from precipitating; the regulating reservoir 1 is provided with a necessary liquid level detecting instrument to protect the submersible pump and the stirring device from running safely.
(2) A reaction tank: the regulating tank 1 is communicated with the reaction tank through a pipeline and a lifting pump 2; a two-stage reaction tank of the reaction tank; the first-stage reaction tank 3 is provided with a sodium hydroxide metering pump and a sodium carbonate metering pump, and the second-stage reaction tank 4 is provided with a PFS metering pump and a PAM metering pump. Thus, the wastewater in the regulating tank 1 is lifted to a two-stage reaction tank by a lifting pump 2, and sodium hydroxide and sodium carbonate are respectively added into a first-stage reaction tank 3 to ensure that Ca in the wastewater is2+、Mg2+Separating out ions and other heavy metal ions; PFS (polyferric sulfate) and PAM (polyacrylamide) are respectively added into the secondary reaction tank 4, so that cyanide-containing substances are separated out and form large particles under the action of a flocculating agent, and most suspended matters are removed by utilizing a sedimentation tank. The first-stage reaction tank 3 and the second-stage reaction tank 4 are respectively provided with a stirrer 7.
(3) And (5) a sedimentation tank: and an overflow port of the secondary reaction tank 4 is communicated with a sedimentation tank 5, and the sedimentation tank 5 is an inclined plate sedimentation tank. The supernatant of the second-stage reaction tank 4 automatically flows to the sedimentation tank 5, and most of alum floc generated in the reaction tank is precipitated and concentrated at the sedimentation tank. The continuous sweeping promotes the concentration of the precipitated sludge; part of sludge flows back to the reaction tank. The opening size of a sludge return valve on a sludge return pipe is controlled by observing the reaction condition in the reaction tank (testing the MLSS value in the reaction tank to determine the sludge return quantity when necessary), and the external sludge return flow which is accurately controlled is used for maintaining the high sludge concentration required by uniform flocculation. An inclined plate of the sedimentation tank 5 is arranged at the upper part of the sedimentation tank 5 and is used for removing residual alum blossom and generating, and finally qualified water is collected through a water outlet channel at the upper part of the sedimentation tank 5.
(4) And (3) a sand filter 6: an upper water outlet channel of the sedimentation tank 5 is communicated with a sand filter 6; qualified produced water in the sedimentation tank 5 is collected through an upper water outlet channel and then automatically flows to the sand filter 6; the sand filter 6 can further remove fine suspended matters, and the safe filtration of the ozone catalytic oxidation process is realized.
(5) An ozone oxidation tower 8: the sand filter 6 is communicated with an ozone oxidation tower 8 through a pipeline, and the ozone oxidation tower 8 is communicated with a self-ozone generator. Qualified produced water in the sand filter 6 enters an ozone oxidation tower 8 for further treatment. The ozone oxidation process is to oxidize organic matters by utilizing hydroxyl radicals with extremely strong oxidizing capacity generated in the reaction process. The ozone oxidation technology has good effect, the reaction product is non-toxic and harmless, and macromolecular organic matters which are difficult to degrade in water can be oxidized into micromolecular substances and even directly degraded into CO2And H2O。
(6) And (3) aeration biological filter 9: the water outlet of the ozone oxidation tower 8 is communicated with the biological aerated filter 9 through a pipeline; the biological aerated filter system is a single-stage biological filter (CN pool), and the filter material in the filter is a ceramsite filter material catalyst. Qualified produced water of the ozone oxidation tower flows into the biological aerated filter by gravity, and aeration is carried out in the filter; through microorganisms attached to the filter material, ammonia nitrogen and residual easily degradable organic matters in the water are oxidized, and pollutants such as the ammonia nitrogen, the organic matters and the like in the water can be better removed through the biological filter.
(7) The denitrification filter 10: the aeration biological filter 9 is communicated with a denitrification filter 10 through a pipeline, and a ceramsite filter material carrier is filled in the filter. Qualified produced water in the biological aerated filter 9 enters a denitrification filter 10; NH in the wastewater under the aerobic condition of the biological aerated filter 93-N is nitrified by nitrifying bacteria to nitrate nitrogen; the wastewater containing nitrate nitrogen enters the denitrification filter 10, and under the anoxic condition, organic matters in a carbon source are used as electron donors, nitrate nitrogen is used as electron acceptors, and the nitrate nitrogen is reduced into nitrogen under the action of facultative anaerobic denitrifying bacteria, so that the aim of denitrification is fulfilled.
(8) The intermediate water tank 11: the denitrification filter 10 is communicated with a middle water tank 11 through a pipeline; the middle water tank 11 is respectively communicated with the sand filter 6, the ozone oxidation tower 8, the aeration biological filter 9 and the denitrification filter 10 through pipelines and a backwashing pump 12. Qualified produced water of the denitrification filter 10 enters an intermediate water tank 11, the intermediate water tank 11 not only provides a water source for the subsequent membrane separation advanced treatment process, but also provides a backwashing water source for the sand filter 6, the ozonation tower 8, the biological aerated filter 9 and the denitrification filter 10 by utilizing a backwashing pump 12.
The implementation case of the system for the advanced pretreatment of the comprehensive iron and steel wastewater comprises the following steps: the treated object is the comprehensive wastewater of steel, and the main water quality conditions are as follows: the pH value is 6.5-8.5, COD is less than or equal to 100mg/L, SS is less than or equal to 330mg/L, ammonia nitrogen is less than or equal to 30mg/L, and the oil content is 3-12 mg/L.
As shown in figure 1, the comprehensive wastewater of steel firstly enters a regulating tank 1, and the total retention time of the regulating tank 1 is designed to be 1 h. The wastewater in the regulating tank 1 is lifted into a two-stage reaction tank by a lift pump 2; adding sodium hydroxide and sodium carbonate medicaments into the primary reaction tank 3 through a metering pump respectively, adding sodium hydroxide to maintain the pH range of the wastewater to be 8.5-10, wherein the adding amount of sodium carbonate is 300-600 mg/l, and the reaction time of the wastewater in the primary reaction tank 3 is 35 min; PFS and PAM reagents are added into the secondary reaction tank 4 through a metering pump respectively, the adding amount of PFS is 30-50 mg/l, the adding amount of PAM is 3-5 mg/l, and the reaction time of wastewater in the secondary reaction tank 4 is 25 min. The supernatant of the second-stage reaction tank 4 automatically flows to a sedimentation tank 5, and the sedimentation tank 5 is designed to have an ascending flow velocity of 13 m/h; qualified produced water in the sedimentation tank 5 is collected through an upper water outlet channel and then automatically flows to the sand filter 6, and the designed filtering speed of the sand filter 6 is 8 m/h; the qualified produced water of the sand filter 6 is dissolved with 10 percent of ozone (the concentration of the ozone is more than or equal to 10 weight percent) into the treated water by a gas-liquid mixing pump, and then enters an ozone oxidation tower 8 for further treatment, and the designed hydraulic retention time of the ozone oxidation tower is 1 h. Qualified produced water of the ozone oxidation tower 8 flows into the biological aerated filter 9 by gravity, the designed working filtration speed of the biological aerated filter 9 is less than or equal to 4m/h, and the backwashing strength of water in the filter is 8.3L/(m/h) 2S) and the strength of gas backwash is 16.7L/(m)2S) and the hydraulic retention time is 2 h. Qualified produced water in the biological aerated filter 9 enters a denitrification filter 10, the filter adopts a mode of water supply from the lower part to the upper part, the working filtering speed is designed to be less than or equal to 4m/h, and the hydraulic retention time is 2 h. Qualified produced water in the denitrification filter 10 enters an intermediate water tank 11; the sand filter 6, the ozone oxidation tower 8, the aeration biological filter 9 and the denitrification filterThe basin 10 backwash water is provided by an intermediate basin 11.
The water quality conditions after treatment are as follows: the pH value is 6.5-8.5, the temporary hardness (calculated by calcium carbonate) is less than or equal to 50mg/L, COD and less than or equal to 30mg/L, the SS is less than or equal to 10mg/L, the ammonia nitrogen is less than or equal to 2mg/L, and the oil content is 1 mg/L.
Claims (5)
1. The deep pretreatment system for the comprehensive steel wastewater is characterized in that: which comprises a regulating tank (1), a reaction tank, a sedimentation tank (5), a sand filter (6), an ozone oxidation tower (8), an aeration biological filter (9), a denitrification filter (10) and a middle water tank (11); the regulating tank (1) is communicated with the reaction tank through a pipeline; an overflow port of the reaction tank is communicated with a sedimentation tank (5); an upper water outlet channel of the sedimentation tank (5) is communicated with a sand filter (6), and the sand filter (6) is communicated with an ozone oxidation tower (8) through a pipeline; the water outlet of the ozone oxidation tower (8) is communicated with the biological aerated filter (9) through a pipeline, the biological aerated filter (9) is communicated with the denitrification filter (10) through a pipeline, and the denitrification filter (10) is communicated with the intermediate water tank (11) through a pipeline; the middle water tank (11) is respectively communicated with the sand filter (6), the ozone oxidation tower (8), the aeration biological filter (9) and the denitrification filter (10) through pipelines.
2. The steel comprehensive wastewater deep pretreatment system according to claim 1, characterized in that: the reaction tank is a two-stage reaction tank; the first-stage reaction tank (3) is provided with a sodium hydroxide metering pump and a sodium carbonate metering pump, and the second-stage reaction tank (4) is provided with a PFS metering pump and a PAM metering pump.
3. The advanced pretreatment system for integrated steel wastewater according to claim 1, characterized in that: the sedimentation tank (5) is an inclined plate sedimentation tank.
4. The advanced pretreatment system for integrated steel wastewater according to claim 1, characterized in that: the aeration biological filter (9) is a single-stage biological filter.
5. The advanced pretreatment system for integrated steel wastewater according to any one of claims 1 to 4, characterized in that: and a lifting pump (2) is arranged on a pipeline between the regulating tank (1) and the reaction tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122931186.0U CN216837539U (en) | 2021-11-26 | 2021-11-26 | Advanced pretreatment system for steel comprehensive wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122931186.0U CN216837539U (en) | 2021-11-26 | 2021-11-26 | Advanced pretreatment system for steel comprehensive wastewater |
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| CN216837539U true CN216837539U (en) | 2022-06-28 |
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| CN202122931186.0U Active CN216837539U (en) | 2021-11-26 | 2021-11-26 | Advanced pretreatment system for steel comprehensive wastewater |
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