CN111186958A - Steel comprehensive sewage advanced treatment method and system - Google Patents
Steel comprehensive sewage advanced treatment method and system Download PDFInfo
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- CN111186958A CN111186958A CN201911405921.5A CN201911405921A CN111186958A CN 111186958 A CN111186958 A CN 111186958A CN 201911405921 A CN201911405921 A CN 201911405921A CN 111186958 A CN111186958 A CN 111186958A
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Classifications
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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
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
-
- 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
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F2303/00—Specific treatment goals
- C02F2303/04—Disinfection
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
- C02F3/286—Anaerobic digestion processes including two or more steps
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention relates to a method and a system for deeply treating steel comprehensive sewage, wherein the method comprises the following steps: the comprehensive sewage is subjected to anaerobic reaction, anoxic reaction, aerobic reaction and mud-water separation in sequence, supernatant obtained by mud-water separation is subjected to denitrification-nitrification biochemical treatment and oxidation reaction in sequence, then is treated by a biological activated carbon filter, a high-density sedimentation tank and a V-shaped filter in sequence, and effluent of the V-shaped filter is disinfected and then is discharged after reaching the standard. And (5) correspondingly setting the system. The invention provides a method and a system for advanced treatment of steel comprehensive sewage, which adopt a process route of biochemical treatment (anaerobic treatment, anoxic treatment, aerobic treatment, denitrification-nitrification biochemical treatment, oxidation treatment and biological activated carbon treatment) and biochemical post-treatment (a high-density sedimentation tank and a V-shaped filter tank), remarkably improve the quality of effluent, ensure that CODcr in the effluent is less than 20mg/L, TN is less than 15mg/L, ammonia nitrogen is less than 1.5mg/L and total phosphorus is less than 0.3mg/L, and the effluent can stably meet the requirements of the discharge standard of steel industrial water pollutants.
Description
Technical Field
The invention belongs to the technical field of sewage treatment in the steel industry, and particularly relates to a steel comprehensive sewage advanced treatment method and a steel comprehensive sewage advanced treatment system.
Background
The comprehensive sewage of the steel enterprise refers to the dry flow sewage collected and conveyed by a combined drainage system or the production drainage collected and conveyed by a split drainage system in the steel enterprise except the special production sewage. The comprehensive sewage mainly comes from the production wastewater of each production unit (blast furnace, continuous casting steel-making, hot rolling and cold rolling) in the plant, the sewage of each unit circulating water system, the strong brine generated by softened water and desalted water stations, the strong brine generated by advanced treatment stations in the plant and the like. The main pollutants of the comprehensive sewage of the steel enterprise comprise total nitrogen, ammonia nitrogen, COD, total phosphorus, SS, oil and the like due to water source introduction, production process introduction, system raw material introduction and the like; the water quality of the typical comprehensive sewage of the steel enterprise is as follows:
at present, the comprehensive sewage treatment of domestic iron and steel enterprises generally adopts a high-density clarification tank and V-shaped filter tank process, the SS and oil removal effect of the process is good, but the removal effect of indexes such as total nitrogen, ammonia nitrogen, COD (chemical oxygen demand), total phosphorus and the like is not ideal, so that the final drainage generally cannot meet the requirements of the discharge standard of iron and steel industrial water pollutants (GB13456-2012) and the special discharge limit value in Table 3. Along with the stricter and stricter national environmental protection requirements, the further upgrading, reconstruction and upgrading of the comprehensive sewage treatment in the domestic steel industry is a necessary trend.
Disclosure of Invention
The invention relates to a steel comprehensive sewage advanced treatment method and a steel comprehensive sewage advanced treatment system, which can at least solve part of defects in the prior art.
The invention relates to a steel comprehensive sewage advanced treatment method, which comprises the following steps:
s1, carrying out anaerobic reaction on the comprehensive sewage to release phosphorus and promote ammoniation of partial organic matters;
s2, carrying out an anoxic reaction on the anaerobic reaction effluent for denitrification treatment;
s3, carrying out aerobic reaction on the anoxic reaction effluent to remove BOD, nitrify the sewage and absorb phosphorus in the sewage;
s4, carrying out mud-water separation on the aerobic reaction effluent;
s5, performing denitrification-nitrification biochemical treatment on the supernatant obtained by separating sludge from water to denitrify the sewage and remove BOD and COD;
s6, carrying out oxidation reaction on the sewage after denitrification-nitrification treatment;
s7, enabling the oxidation reaction effluent to enter a biological activated carbon filter for reaction, and removing organic matters in the sewage through the synergistic effect of activated carbon adsorption, oxidation reaction and biodegradation;
and S8, treating the effluent of the biological activated carbon filter by a high-density sedimentation tank and a V-shaped filter in sequence, and discharging the effluent of the V-shaped filter after disinfection.
In one embodiment, in S4, the aerobic reaction effluent is subjected to coagulation flocculation reaction and then to sludge-water separation.
In one embodiment, the oxidation reaction is performed in an ozone contact tank in S6.
As one embodiment, the ozone contact tank is of a three-stage series structure, and the adding proportion of ozone is 2:1: 1.
As one embodiment, S1 is preceded by a sewage pretreatment step including:
and S0, feeding the comprehensive sewage into a sewage adjusting tank for tempering and quantity adjusting treatment.
In one embodiment, the sludge obtained by sludge-water separation in S4 is returned to S1 to be subjected to anaerobic reaction treatment.
The invention also relates to a steel comprehensive sewage advanced treatment system, which comprises an anaerobic reaction tank, an anoxic tank, an aerobic reaction tank, a biochemical clarification tank, a denitrification-nitrification treatment unit, an oxidation reaction tank, a biological activated carbon filter tank, a high-density sedimentation tank and a V-shaped filter tank which are connected in sequence.
In one embodiment, the oxidation reaction tank is an ozone contact tank, and the ozone contact tank is provided with an ozone aeration mechanism.
As an embodiment, a coagulation flocculation tank is further arranged between the aerobic reaction tank and the biochemical clarification tank.
As one embodiment, the integrated steel and iron sewage advanced treatment system further comprises a sewage adjusting tank, wherein the sewage adjusting tank is connected with the anaerobic reaction tank and is positioned at the upstream of the anaerobic reaction tank.
The invention has at least the following beneficial effects:
the invention provides a method and a system for advanced treatment of steel comprehensive sewage, which adopt a process route of biochemical treatment (anaerobic treatment, anoxic treatment, aerobic treatment, denitrification-nitrification biochemical treatment, oxidation treatment and biological activated carbon treatment) and biochemical post-treatment (a high-density sedimentation tank and a V-shaped filter tank), remarkably improve the quality of effluent, ensure that CODcr in the effluent is less than 20mg/L, TN is less than 15mg/L, ammonia nitrogen is less than 1.5mg/L and total phosphorus is less than 0.3mg/L, and the effluent can stably meet the requirements of the discharge standard of steel industrial water pollutants.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic composition diagram of a steel integrated wastewater advanced treatment system provided by an embodiment of the invention;
fig. 2 is a schematic structural diagram of an anoxic tank provided in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, the embodiment of the invention provides a steel comprehensive sewage advanced treatment method, which comprises the following steps:
s1, carrying out anaerobic reaction on the comprehensive sewage to release phosphorus and promote ammoniation of partial organic matters; the anaerobic reaction is generally carried out in an anaerobic reaction tank;
s2, carrying out an anoxic reaction on the anaerobic reaction effluent for denitrification treatment; the anoxic reaction is generally carried out in an anoxic reaction tank;
s3, carrying out aerobic reaction on the anoxic reaction effluent to remove BOD, nitrify the sewage and absorb phosphorus in the sewage; the aerobic reaction is generally carried out in an aerobic reaction tank, and it can be understood that the aerobic reaction tank has multiple functions, BOD and COD in the sewage are removed in the step, nitrate nitrogen in the sewage is also treated, and in addition, too deep phosphorus in the sewage and the return sludge is also removed;
preferably, the amount of the circulating reflux is designed and adjusted according to the actual situation, and in this embodiment, the amount of the reflux of the aerobic reaction effluent into the anoxic reaction tank is Q to 4Q.
S4, carrying out mud-water separation on the aerobic reaction effluent; in the embodiment, as shown in fig. 1, the sludge-water separation is performed in a biochemical clarification tank, wherein the settled sludge automatically flows into a sludge tank through a tank bottom sludge pipe, the sludge in the sludge tank is preferably treated by returning to the anaerobic reaction tank through a sludge return pump, and excess phosphorus in the sludge can be released in the anaerobic reaction tank; the supernatant obtained by mud-water separation is subjected to post-process treatment, an intermediate water tank can be further configured for the biochemical clarification tank, the supernatant obtained by mud-water separation automatically flows into the intermediate water tank, and then enters the post-process treatment through a lifting pump in the intermediate water tank, so that the treatment steps of the front and the rear processes can be coordinated;
further preferably, in the step S4, the aerobic reaction effluent is subjected to coagulation flocculation reaction and then to sludge-water separation, so that the sludge-water separation effect and efficiency can be improved, and suspended matters SS and total phosphorus TP in the supernatant of the sludge-water separation can be reduced. This flocculation reaction that thoughtlessly congeals goes on in the flocculation basin that thoughtlessly congeals, should congeal the flocculation basin and include first coagulation basin and first flocculation basin, throw PAC, PAM respectively in first coagulation basin and first flocculation basin and thoughtlessly congeal, flocculation reaction for originally small flocculating constituent forms the flocculating constituent of large granule, the subsequent sedimentation separation of being convenient for.
S5, performing denitrification-nitrification biochemical treatment on the supernatant obtained by mud-water separation to denitrify the sewage; generally, denitrification-nitrification biochemical treatment is carried out in a denitrification biological filter and a nitrification biological filter, specifically, supernatant obtained by mud-water separation enters the denitrification biological filter, and the primary function of the denitrification biological filter is denitrification; the effluent of the denitrification biological filter automatically flows into the nitrification biological filter, the nitrification biological filter is multifunctional, and the reactions of removing BOD in the sewage, nitrifying the sewage and the like are all carried out in the filter. Furthermore, a return channel is arranged between the nitrification biological filter and the denitrification biological filter, specifically, part of nitrified liquid in the nitrification biological filter partially returns to the denitrification biological filter, and the other part of nitrified liquid enters post-process treatment; in this example, the reflux amount was 0.5Q to 4Q (Q is the total amount of wastewater).
S6, carrying out oxidation reaction on the sewage after denitrification-nitrification treatment; further preferably, in the present embodiment, the oxidation reaction is performed by using ozone, and more specifically, the oxidation reaction is performed in an ozone contact tank, ozone is supplied through an aeration distribution system at the bottom of the tank, and the ozone is a strong oxidant, which can change organic pollutants in the sewage from macromolecules into small molecules, improve the biodegradability of the sewage, and even completely oxidize and decompose the organic pollutants into harmless inorganic substances such as carbon dioxide, water and mineral salts, etc., without generating new pollution.
Further preferably, the ozone contact tank is of a three-stage series structure, the adding proportion of ozone is 2:1:1, and the oxidation treatment effect can be remarkably improved.
S7, feeding the oxidation reaction effluent into a biological activated carbon filter for reaction; in the biological activated carbon filter, organic matters in sewage are continuously adsorbed to the surface of activated carbon, so that the contact time of the organic matters and a biological film in the biological activated carbon is fully ensured, the efficiency of biochemical organic matters is greatly improved, the adsorption capacity of the organic matters adsorbed on the activated carbon is recovered while the organic matters are biochemically degraded, and meanwhile, a certain amount of oxidant is still contained in oxidation reaction effluent water, so that the organic matters in the sewage can be effectively removed under the synergistic action of the adsorption, the oxidation reaction and the biodegradation of the activated carbon;
s8, treating the effluent of the biological activated carbon filter by a high-density sedimentation tank and a V-shaped filter in sequence, mainly removing SS (suspended solids) and oil and other pollutants in the effluent, certainly having a certain removing effect on COD (chemical oxygen demand), suspended matters and other pollutants, and discharging the effluent of the V-shaped filter after being disinfected to reach the standard. Both high density settling tanks and V-shaped tanks commonly used in the art are suitable for use in this embodiment. In one embodiment, the high-density sedimentation tank comprises a second coagulation tank, a second flocculation tank and a sedimentation concentration tank, wherein PAC and PAM are respectively added into the second coagulation tank and the second flocculation tank for coagulation and flocculation reactions, so that the original tiny flocs form large granular flocs, and mud water backflow is realized in the sedimentation tank, and the COD concentration, suspended matters and total phosphorus in the sewage can be further removed through the process; the settled sludge is sent to a sludge concentration tank for treatment through a sludge pump, and the supernatant of the high-density clarification tank automatically flows into a V-shaped filter tank, so that the sewage is filtered in the V-shaped filter tank, and the COD concentration, suspended matters and total phosphorus in the sewage can be further removed.
Further optimizing the method, as shown in fig. 1, before S1, a sewage pretreatment step is further performed, wherein the sewage pretreatment step comprises: s0, the comprehensive sewage enters a sewage adjusting tank to be subjected to quality adjustment and quantity adjustment treatment, so that the subsequent sewage treatment effect can be improved, particularly the steel comprehensive sewage is more in type, complex in component and inconsistent, the purposes of quality adjustment and quantity adjustment treatment are achieved through the sewage adjusting tank, and the inconsistency of sewage production of each production unit can be coordinated.
The advanced treatment method for the steel and iron integrated sewage provided by the embodiment adopts a process route of biochemical treatment (anaerobic treatment, anoxic treatment, aerobic treatment, denitrification, nitrification, biochemical treatment, oxidation, biological activated carbon treatment) and biochemical post-treatment (a high-density sedimentation tank and a V-shaped filter tank), so that the quality of effluent is remarkably improved, the CODcr in the effluent is less than 20mg/L, the TN is less than 15mg/L, the ammonia nitrogen is less than 1.5mg/L, the total phosphorus is less than 0.3mg/L, and the effluent can stably meet the requirements of the water pollutant discharge standard of the steel and iron industry.
Example two
The embodiment of the invention provides a steel comprehensive advanced sewage treatment system which comprises an anaerobic reaction tank 2, an anoxic tank 3, an aerobic reaction tank 4, a biochemical clarification tank 6, a denitrification-nitrification treatment unit 7, an oxidation reaction tank 8, a biological activated carbon filter tank 9, a high-density sedimentation tank 10 and a V-shaped filter tank 11 which are connected in sequence.
The anaerobic reaction tank 2 used in sewage treatment is suitable for the present embodiment, and the anaerobic reaction in the anaerobic reaction tank 2 is also conventional in the art, for example, anaerobic biological filler is added into the anaerobic reaction tank 2, and will not be described in detail.
The anoxic tank 3 used in the general sewage treatment is suitable for the embodiment; the effluent from the anaerobic reactor 2 preferably enters the anoxic tank 3 by gravity, and it will be understood that the two are arranged adjacently, for example, they are separated by a partition wall.
The aerobic reaction tank 4 used in the general sewage treatment is suitable for the embodiment; the aerobic reaction in the aerobic reaction tank 4 is also a conventional technique in the art, such as adding aerobic biological filler in the aerobic reaction tank 4, and will not be described in detail herein. The effluent from the anoxic tank 3 preferably flows automatically into the aerobic reaction tank 4, which may be arranged adjacently, for example, separated by a partition wall. Preferably, in the aerobic reaction effluent, a part of the aerobic reaction effluent flows back to the anoxic reaction tank, and the other part of the aerobic reaction effluent is subjected to subsequent treatment, so that a first return pipe is arranged on the aerobic reaction tank 4 and is connected to the anoxic reaction tank.
The biochemical clarification tank 6 used in the general sewage treatment is suitable for the embodiment; the bottom of the biochemical clarification tank 6 is provided with a sludge pipe, the sludge pipe is connected with a sludge tank, sludge in the sludge tank preferably flows back to the anaerobic reaction tank 2 through a sludge return pump for treatment, namely the sludge tank is provided with a sludge return pipe, and the sludge return pipe is connected to the anaerobic reaction tank 2. Further, the biochemical clarification tank 6 is also provided with an intermediate water tank, supernatant obtained by mud-water separation automatically flows into the intermediate water tank, and then enters post-process treatment through a lift pump in the intermediate water tank, and the treatment steps of the front and the rear processes can be coordinated, namely the intermediate water tank is arranged between the biochemical clarification tank 6 and the denitrification-nitrification treatment unit 7.
Preferably, the aerobic reaction effluent is subjected to coagulation flocculation reaction and then sludge-water separation, so that the sludge-water separation effect and efficiency can be improved, and suspended matters SS and total phosphorus TP in the supernatant of the sludge-water separation are reduced. The coagulation flocculation reaction is carried out in a coagulation flocculation tank 5, namely the coagulation flocculation tank 5 is also arranged between the aerobic reaction tank 4 and the biochemical clarification tank 6; this flocculation basin 5 thoughtlessly congeals including first pond and the first flocculation basin, throws PAC, PAM in first pond of congealing and the flocculation reaction of throwing respectively in first pond of congealing and the first flocculation basin for originally small flocculating constituent forms the flocculating constituent of large granule, the follow-up sedimentation separation of being convenient for.
The denitrification-nitrification unit 7 used in the sewage treatment is generally applicable to the present embodiment, and the denitrification-nitrification unit 7 generally includes a denitrification biological filter 71 and a nitrification biological filter 72, specifically, supernatant obtained by separating sludge and water enters the denitrification biological filter 71, that is, the above-mentioned biochemical clarifier 6/intermediate water tank is connected to the denitrification biological filter 71, and effluent of the denitrification biological filter 71 automatically flows into the nitrification biological filter 72. Further, a return channel is arranged between the nitrification biological filter 72 and the denitrification biological filter 71, specifically, a second return pipe is arranged on the nitrification biological filter and is connected to the denitrification biological filter 71, the nitrified liquid in the nitrification biological filter 72 can partially return to the denitrification biological filter 71, and the other part of the nitrified liquid enters the post-process treatment.
In the embodiment, the oxidation reaction tank 8 is preferably an ozone contact tank 8, the ozone contact tank 8 is provided with an ozone aeration mechanism, and ozone is a strong oxidant, which can change organic pollutants in sewage from macromolecules into micromolecules, improve the biodegradability of sewage, and even completely oxidize and decompose the organic pollutants into harmless inorganic substances such as carbon dioxide, water and mineral salts, so that no new pollution is generated. Further preferably, the ozone contact tank 8 is of a three-stage series structure, the adding proportion of ozone is 2:1:1, and the oxidation treatment effect can be remarkably improved.
The biological activated carbon filter 9 used in the general sewage treatment is suitable for the present embodiment, and the specific structure thereof is not described herein. In the biological activated carbon filter 9, the organic matter in the sewage is continuously adsorbed to the surface of the activated carbon, so that the contact time of the organic matter and a biological film in the biological activated carbon is fully ensured, the efficiency of biochemical organic matter is greatly improved, the adsorption capacity of the organic matter adsorbed on the activated carbon is recovered while the organic matter is biochemically degraded, and meanwhile, a certain amount of oxidant is still contained in the oxidation reaction effluent, so that the organic matter in the sewage can be effectively removed under the synergistic action of the adsorption of the activated carbon, the oxidation reaction and the biodegradation.
The high-density sedimentation tank 10 and the V-shaped filter tank 11 are conventional treatment equipment in the field. In one embodiment, the high-density sedimentation tank 10 includes a second coagulation tank, a second flocculation tank and a sedimentation concentration tank, PAC and PAM are respectively added into the second coagulation tank and the second flocculation tank for coagulation and flocculation reactions, so that the originally tiny flocs form large-particle flocs, and mud-water backflow is realized in the sedimentation tank, and by the process, the COD concentration, suspended solids and total phosphorus in the sewage can be further removed; the settled sludge is sent to a sludge concentration tank for treatment by a sludge pump, and the supernatant of the high-density clarification tank automatically flows into the V-shaped filter 11, and the sewage is filtered in the V-shaped filter 11, so that the COD concentration, suspended matters and total phosphorus in the sewage can be further removed.
Further preferably, as shown in fig. 1, the integrated steel and iron sewage advanced treatment system further comprises a sewage adjusting tank 1, wherein the sewage adjusting tank 1 is connected with the anaerobic reaction tank 2 and is positioned at the upstream of the anaerobic reaction tank 2. The steel comprehensive sewage is discharged into the sewage adjusting tank 1 through a pipe network, and the comprehensive sewage is fed into the sewage adjusting tank 1 to be subjected to quality and quantity adjusting treatment and then can be fed into the anaerobic reaction tank 2 through a lifting pump.
The advanced treatment system for steel and iron integrated sewage provided by the embodiment adopts the process composition of a biochemical treatment mechanism (an anaerobic reaction tank 2+ an anoxic tank 3+ an aerobic reaction tank 4+ a denitrification-nitrification biochemical treatment + an oxidation reaction tank 8+ a biological activated carbon filter tank 9) + a biochemical post-treatment mechanism (a high-density sedimentation tank 10+ a V-shaped filter tank 11), so that the quality of effluent water is remarkably improved, the CODcr of the effluent water is less than 20mg/L, the TN of the effluent water is less than 15mg/L, the ammonia nitrogen of the effluent water is less than 1.5mg/L, and the total phosphorus of the effluent water is less than 0.3mg/L, and the effluent water can stably meet the requirements of the water pollutant discharge standard of the.
EXAMPLE III
The present embodiment provides an anoxic tank 3, which can be used in the first and second embodiments to perform an anoxic reaction on sewage.
As shown in fig. 2, the anoxic tank 3 includes an anoxic tank body, the anoxic tank body is provided with a water inlet and a water outlet, the anoxic tank body is divided into a plurality of anoxic grids 301 by a partition plate 302, each anoxic grid 301 is connected in series and conducted so as to form a sewage flow path from the water inlet to the water outlet, and a stirrer 303 is arranged in each anoxic grid 301.
The agitator 303 is conventional in the art, and in one embodiment, the agitator 303 is a submersible agitator.
The partition 302 may be, for example, a concrete wall made of the same material as the anoxic tank body, and the partition 302 may be provided with a sewage inlet or a sewage outlet as required.
It can be understood that, for the above-mentioned serial connection and conduction structure of the oxygen-deficient grids 301, sewage flows through the oxygen-deficient grids 301 in sequence to react and realize the cascade of water flow, which can be realized by arranging the sewage inlet and the sewage outlet of the oxygen-deficient grids 301, that is, along the serial connection direction, the sewage outlet of the previous oxygen-deficient grid 301 is communicated with the sewage inlet of the next oxygen-deficient grid 301, so as to form a sewage flow path through which sewage flows directionally.
The anoxic tank 3 provided by the embodiment separates the anoxic tank body into a plurality of anoxic grids 301, and the stirrer 303 is independently arranged in each anoxic grid 301, so that the phenomenon that short flow easily occurs in the anoxic tank 3 in the past is avoided, the reaction efficiency and the reaction effect of the anoxic tank 3 can be effectively improved, and the addition of a carbon source is reduced.
In one embodiment, a carbon source adding unit is arranged on the anoxic tank 3, and the carbon source adding unit may be, for example, a sodium acetate tank arranged above the anoxic tank 3, and preferably, the sodium acetate tank is arranged right above the first anoxic grid 301; in another embodiment, when the anoxic tank 3 is used for treating the steel and iron integrated sewage, the carbon source adding unit is a domestic sewage pipe or an urban landfill leachate supply pipe or the like. Or, in the first embodiment, when the anaerobic reaction tank 2 is arranged at the upstream of the anoxic tank 3, the carbon source adding unit may be arranged on the anaerobic reaction tank 2.
Further preferably, the bottom of each oxygen-poor lattice 301 is also provided with an aeration pipe, so that the reaction efficiency can be improved to a certain extent, and under the requirement of certain working conditions, the stirring effect of sewage in the corresponding oxygen-poor lattice 301 can be enhanced through the aeration pipe.
The structure of the anoxic tank 3 is further optimized, as shown in fig. 2, each anoxic grid 301 is arranged in a serpentine shape along the sewage flow direction, and under the condition of limited area of the anoxic tank body, the number of the anoxic grids 301 can be increased, the retention time of the sewage in the anoxic tank 3 can be prolonged, and thus the anoxic reaction effect is improved. Of course, other arrangements are also suitable for use in this embodiment, such as a linear arrangement of the hypoxic cells 301, or a circular arrangement, etc.
The structure of the anoxic pond 3 is further optimized, the sewage inlet and the sewage outlet of each anoxic grid 301 are arranged on the side wall of the anoxic grid 301, one of the sewage inlet and the sewage outlet is arranged at the bottom of the corresponding side wall, and the other sewage inlet is arranged at the top of the corresponding side wall. That is, when the sewage inlet of the anoxic compartment 301 is arranged at the bottom of the side wall of the anoxic compartment 301, the sewage outlet of the anoxic compartment 301 is arranged at the top of the side wall of the anoxic compartment 301; otherwise, the opposite is true. The structure can prolong the retention time of sewage in the anoxic grids 301, and can form an upward-flow and downward-flow sewage flow direction in two adjacent anoxic grids 301, thereby improving the anoxic reaction effect.
In an alternative embodiment, as shown in fig. 2, each of the anoxic compartments 301 is a square compartment, and the sewage inlet and the sewage outlet of each of the anoxic compartments 301 are respectively disposed on two adjacent or opposite side walls of the anoxic compartment 301. On the premise of convenient arrangement, the sewage inlet and the sewage outlet are generally arranged on two opposite side walls of the oxygen-deficient grid 301, so that the circulation path of sewage can be prolonged, and the reaction time of the sewage is prolonged; in this structure, it is preferable to design the sewage inlet and the sewage outlet to be diagonally arranged. In some cases, in order to facilitate the circulation of the sewage in the adjacent two anoxic compartments 301, for example, in the above-described configuration in which the anoxic compartments 301 are arranged in a serpentine shape, the sewage inlet and the sewage outlet may be provided in the adjacent two side walls of the anoxic compartments 301.
Further preferably, as shown in fig. 2, when the sewage inlet and the sewage outlet of the anoxic compartment 301 are respectively disposed on two adjacent side walls of the anoxic compartment 301, the agitator 303 in the anoxic compartment 301 is located at a corner defined by the two adjacent side walls. Additionally, a stirrer 303 may be further added at the opposite corner to prevent a water flow dead zone from being formed in the oxygen-deficient lattice 301.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The advanced treatment method for the steel comprehensive sewage is characterized by comprising the following steps:
s1, carrying out anaerobic reaction on the comprehensive sewage to release phosphorus and promote ammoniation of partial organic matters;
s2, carrying out an anoxic reaction on the anaerobic reaction effluent for denitrification treatment;
s3, carrying out aerobic reaction on the anoxic reaction effluent to remove BOD, nitrify the sewage and absorb phosphorus in the sewage;
s4, carrying out mud-water separation on the aerobic reaction effluent;
s5, performing denitrification-nitrification biochemical treatment on the supernatant obtained by separating sludge from water to denitrify the sewage and remove BOD and COD;
s6, carrying out oxidation reaction on the sewage after denitrification-nitrification treatment;
s7, enabling the oxidation reaction effluent to enter a biological activated carbon filter for reaction, and removing organic matters in the sewage through the synergistic effect of activated carbon adsorption, oxidation reaction and biodegradation;
and S8, treating the effluent of the biological activated carbon filter by a high-density sedimentation tank and a V-shaped filter in sequence, and discharging the effluent of the V-shaped filter after disinfection.
2. The steel integrated wastewater advanced treatment method according to claim 1, characterized in that: in S4, the aerobic reaction effluent is subjected to coagulation flocculation reaction and then mud-water separation.
3. The steel integrated wastewater advanced treatment method according to claim 1, characterized in that: in S6, the oxidation reaction is carried out in an ozone contact cell.
4. The integrated steel sewage advanced treatment method according to claim 3, characterized in that: the ozone contact tank is of a three-stage series structure, and the adding proportion of ozone is 2:1: 1.
5. The integrated steel and iron sewage advanced treatment method according to claim 1, further comprising a sewage pretreatment step before S1, wherein the sewage pretreatment step comprises:
and S0, feeding the comprehensive sewage into a sewage adjusting tank for tempering and quantity adjusting treatment.
6. The method for deeply treating steel and iron integrated sewage according to claim 1, wherein the sludge obtained by sludge-water separation in S4 is returned to S1 for anaerobic reaction treatment.
7. The utility model provides a sewage advanced treatment system is synthesized to steel which characterized in that: comprises an anaerobic reaction tank, an anoxic tank, an aerobic reaction tank, a biochemical clarification tank, a denitrification-nitrification treatment unit, an oxidation reaction tank, a biological activated carbon filter tank, a high-density sedimentation tank and a V-shaped filter tank which are connected in sequence.
8. The integrated steel sewage advanced treatment system according to claim 7, characterized in that: the oxidation reaction tank is an ozone contact tank, and the ozone contact tank is provided with an ozone aeration mechanism.
9. The integrated steel sewage advanced treatment system according to claim 7, characterized in that: a coagulation flocculation tank is also arranged between the aerobic reaction tank and the biochemical clarification tank.
10. The integrated steel sewage advanced treatment system according to claim 7, characterized in that: the anaerobic reaction tank is connected with the sewage adjusting tank, and the sewage adjusting tank is connected with the anaerobic reaction tank and is positioned at the upstream of the anaerobic reaction tank.
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| CN109133532A (en) * | 2018-10-10 | 2019-01-04 | 浙江博华环境技术工程有限公司 | A kind of process for town sewage treatment being applicable in quasi- IV class water quality standard |
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| WO2017005154A1 (en) * | 2015-07-07 | 2017-01-12 | 洪胜男 | High-efficiency wastewater denitrification and dephosphorization process and system |
| CN108264202A (en) * | 2018-03-30 | 2018-07-10 | 安徽华骐环保科技股份有限公司 | A kind of process for town sewage treatment up to standard to IV class water of surface water |
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Application publication date: 20200522 |