CN108128974B - Device and process for enhancing adsorption of industrial wastewater by utilizing domestic sewage excess sludge - Google Patents
Device and process for enhancing adsorption of industrial wastewater by utilizing domestic sewage excess sludge Download PDFInfo
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Abstract
The invention provides a system for reinforcing and adsorbing industrial wastewater by utilizing domestic sewage excess sludge, which comprises the following steps: the system comprises an SBR reactor, an industrial wastewater adsorption tank, an intermediate sedimentation tank, a Fenton oxidation tank and a coagulating sedimentation tank which are sequentially connected in series; wherein the sludge discharging and collecting area of the SBR reactor is communicated with the industrial wastewater adsorption tank; and the sludge discharging and collecting area of the SBR reactor, the middle sedimentation tank and the bottom of the coagulating sedimentation tank are communicated with a sludge collecting tank. The invention improves the traditional adsorption regeneration method by utilizing the domestic sewage excess sludge, applies the method to the toxic and harmful industrial wastewater, performs single adsorption, ensures the activity of the zoogloea, has higher content of zoogloea polysaccharide, large viscosity and better adsorption effect, is more important, and avoids the incomplete regeneration and the digestion loss of the regenerated sludge. In particular to the waste water treatment in the industries of electroplating, pharmacy, chemical industry and the like.
Description
Technical Field
The invention belongs to the field of industrial sewage treatment, and particularly relates to a system and a process for intensively adsorbing industrial wastewater by utilizing domestic sewage excess sludge.
Background
The industrial wastewater has large water quantity and obvious water quality fluctuation, is one of important and difficult-to-treat pollution sources, has complex discharge mode, has intermittent discharge, continuous discharge, regular discharge, irregular discharge and the like, and causes great difficulty in preventing and treating pollution. In particular, the chemical wastewater has various pollutants, large concentration fluctuation, high heavy metal content, poor biodegradability and high suspended matter content which can reach 3000mg/L and is 10 times of the domestic wastewater, and contains refractory organic pollutants.
The domestic sewage treatment produces a large amount of excess sludge, and a plurality of microorganisms in the sludge have the characteristic of enriching heavy metals, so that secondary pollution can be produced when the sludge is used as a fertilizer. Especially, the large and medium chemical plants and domestic sewage treatment in living areas thereof generate considerable amount of excess sludge, possibly having hazardous waste characteristics, and the common incineration or landfill needs to meet the standard requirements, so that the cost is high.
However, the zoogloea in the sludge for treating the domestic sewage has strong adsorption effect, the zoogloea in the domestic sewage is easy to form, has high viscosity and high polysaccharide content and has higher efficiency than industrial excess sludge, so the excess sludge for treating the domestic sewage can be used as an adsorbent. Most of the industrial wastewater has biological toxicity, so that the industrial wastewater directly enters a biochemical treatment unit to cause sludge digestion, the treatment process of utilizing excess sludge for adsorption and timely sludge discharge can synchronously realize sludge reduction, and no process example exists at present for industrially utilizing the excess sludge of domestic sewage for adsorbing heavy metals and using a zoogloea as a buffer adsorbent and cooperating with the sludge reduction.
Disclosure of Invention
In view of the above, the present invention provides an industrial wastewater treatment system and process using domestic sewage excess sludge to enhance adsorption, so as to overcome the defects of the prior art, improve the traditional adsorption regeneration method using domestic sewage excess sludge, apply the traditional adsorption regeneration method to toxic and harmful industrial wastewater, perform single adsorption, ensure the activity of zoogloea, have higher content of zoogloea polysaccharide, large viscosity, better adsorption effect and more important property, and avoid incomplete regeneration and digestion loss of regenerated sludge. In particular to the waste water treatment in the industries of electroplating, pharmacy, chemical industry and the like.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a system for reinforcing and adsorbing industrial wastewater by utilizing domestic sewage excess sludge comprises an SBR reactor, an industrial wastewater adsorption tank, an intermediate sedimentation tank, a Fenton oxidation tank and a coagulating sedimentation tank which are sequentially connected in series;
wherein the sludge discharging and collecting area of the SBR reactor is communicated with the industrial wastewater adsorption tank;
and the sludge discharging and collecting area of the SBR reactor, the middle sedimentation tank and the bottom of the coagulating sedimentation tank are communicated with a sludge collecting tank.
Further, a sludge discharging and collecting area of the SBR is communicated with the industrial wastewater adsorption tank through a sludge uniform distribution device;
further, a stirrer is arranged at the bottom of the industrial wastewater adsorption tank;
further, an aeration pipeline and an aeration head are arranged at the lower part of the industrial wastewater adsorption tank;
furthermore, the industrial wastewater adsorption tank is provided with a zoogloea.
Furthermore, the intermediate sedimentation tank adopts an inclined plate sedimentation tank.
Furthermore, the bottom of the Fenton oxidation pond is provided with a stirring and mixing system.
Further, the sludge collecting pool is communicated with a sludge oxidation digestion pool, and the sludge oxidation digestion pool is communicated with the industrial wastewater adsorption pool.
Further, the coagulating sedimentation tank is communicated with the SBR reactor through an interlocking reflux system.
The invention also aims to provide a process for enhancing the adsorption of industrial wastewater by utilizing domestic sewage excess sludge, which improves the traditional adsorption regeneration method by utilizing the domestic sewage excess sludge.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a process for strengthening adsorption of industrial wastewater by utilizing domestic sewage excess sludge comprises the following steps:
step 1, after domestic sewage enters an SBR reactor for treatment, placing excess sludge in the industrial adsorption tank;
step 2, introducing the industrial wastewater to be treated into the industrial wastewater adsorption tank for treatment;
step 3, the wastewater treated by the industrial wastewater adsorption tank enters the intermediate sedimentation tank for treatment;
step 4, the wastewater treated by the intermediate sedimentation tank enters the Fenton oxidation tank for treatment;
and 5, the wastewater treated by the Fenton oxidation tank enters the coagulating sedimentation tank for treatment.
Preferably, the aeration intensity in the SBR reactor is 1.0-1.5kgO21500 mg/L of/Kg BOD, 1500 mg/L of MLSS, 6-8 of PH, 25-25 of T, and 0.05-0.08Kg BOD of sludge load5(iv) Kg MLSS; preferably, the SBR reactor is connected with two sets of continuous operation in parallel, and the period number is 3-5; more preferably, the cycle recommendation time is: aerating for 2h, precipitating for 1h, and standing by for 2.5 h.
Preferably, in the industrial wastewater adsorption tank: t is 25-35 ℃; HRT is 0.5-1 h; MLSS2.5-6.0 g/L.
Preferably, the intermediate sedimentation tank adopts an inclined plate sedimentation tank, and has the following structural characteristics:
the distance between the inclined plates is generally not less than 50mm, and the length of the inclined plates is 1.0-1.2 m;
the upper layer of the inclined plate is 1.0m deep in water, and the bottom buffer layer is 1.0m high; a wastewater distribution area is arranged below the inclined plate, the height of the wastewater distribution area is not less than 0.5m, and a sludge area is arranged below the water distribution area;
collecting the effluent of the pool by adopting a plurality of rows of hole pipes, wherein holes are positioned 2cm below the water surface; the flow rate is 0.5-0.7 mm/s.
Preferably, in the fenton oxidation pond: the average retention time HRT of sewage is 20-40min, the PH is 2-4, and Fe2+The concentration is 150-2O2The concentration is 200-280mg/L, H2O2With FeSO4.7H2The molar ratio of O is 1.5-2.5;
more preferably, in the fenton oxidation pond: the average retention time HRT of the sewage is 30min, the PH is 3, and Fe2+The concentration is 180mg/L, H2O2The concentration is 240mg/L, H2O2With FeSO4.7H2The molar ratio of O was 2.2, and the COD removal rate was about 66%.
Preferably, in the coagulating sedimentation tank: the PH value is 7-10, and the dosage of PAM is 2.4-4.0 mg/L;
more preferably, in the coagulating sedimentation tank: PH is 8, PAM dosage is 3.0mg/L, COD, chroma and volatile phenol removal rate can reach 70%, 89% and 80% respectively.
Preferably, the sludge collecting tank collects partial residual sludge from the SBR reactor, the intermediate settling tank sludge and the coagulating sedimentation tank sludge;
more preferably, in the mud collecting tank: SRT is less than 3h, the gradient of the pool bottom is 3%, and the effective volume and size are determined by sludge load.
More preferably, the charging load in the sludge oxidation digestion tank is as follows: fe2+＝5000-8000mg/L,H2O2＝3000mg/L；
More preferably, the charging load in the sludge oxidation digestion tank is as follows: fe2+＝6000mg/L,H2O23000mg/L, and the upper part is provided with a ventilation device for preventing gas accumulation.
The working process of the invention is as follows:
(1) SBR reactor
The SBR reactor is used for treating domestic sewage:
domestic sewage generated from a plant area, a park area and the like firstly enters an SBR reactor (namely an activated sludge reactor), and the SBR reactor adopts five working periods of water inlet, aeration reaction, sedimentation and sludge discharge, water outlet and standby. The working periods of the two sets of SBR reaction devices are alternately complementary, so that continuous water inlet and continuous and uniform mud supply are ensured.
Domestic sewage can enter intermittently, and can also enter water while aerating. The reactor integrates the functions of homogenization, primary sedimentation, biodegradation, secondary sedimentation and the like, and does not need to be provided with a front-section regulating tank. A sludge discharging and collecting area is arranged below the lower part. When the method is in operation, the SVI value is low, the sludge is easy to precipitate, and the sludge expansion is not easy to generate. According to the water quality of inlet water and the water outlet requirement, the nitrogen and phosphorus removal can be carried out in the SBR reactor by adjusting the operation mode and reforming the system. The process can be automated by using automatic control equipment such as an electric valve, a liquid level meter, an automatic timer, a PLC and the like, and the installation and design of the automatic control equipment are carried out according to the teaching of the prior art, so that the invention is not introduced. Compared with other sewage treatment systems, the SBR reactor occupies a small area, is resistant to impact load and has the capacity of treating toxic or high-concentration organic wastewater. The process adopts an SBR reaction system to save a secondary sedimentation tank, and has the advantages of small land occupation, low operation cost, flexible operation, short sludge age, high activity and good sedimentation performance. Five operation periods are alternately carried out, so that continuous water inlet and continuous mud outlet can be ensured.
(2) Industrial adsorption tank
Adsorption of organic matters and heavy metals in industrial wastewater:
in the SBR reactor, cells of activated sludge are embedded in a colloid, and a mucous substance surrounds the outside of cell walls of the cells, which is called a mucous layer. The mucus layer is not necessarily thick, and its components are mainly polysaccharides and pectins. Mucus formation is a normal consequence of bacterial metabolism, and the mucus layers of bacteria can bind together, causing the growth of many bacteria in clumps called zoogloea or jelly fungi. The zoogloea is an important component of SBR activated sludge and has strong adsorption capacity and capacity of decomposing organic matters. Residual activated sludge discharged through the SBR reactor. This process is not suitable for filamentous fungi production and therefore propagation is inhibited, thus facilitating prevention of sludge bulking and settling in the intermediate settling tank.
The excess sludge discharged from the SBR reactor contains a large amount of zoogloea, and the excess sludge is in a hungry state, so that the adsorption activity is high, and the one-time adsorption capacity of the waste water containing a large amount of suspended and colloidal particles is large. The residual sludge in the heavy SBR reactor is uniformly dispersed in the industrial adsorption tank by a sludge uniform distribution device, the uniform mixing with the inlet water is ensured by a tank bottom stirrer, an aeration pipeline and an aeration head are arranged at the lower part for supplying air to the adsorption tank, the degradation and adsorption activity of zoogloea in the residual sludge is maintained, and certain micro tangential flow is provided.
In the industrial adsorption tank, sewage is fully contacted with sludge microorganisms in residual sludge from the SBR reactor to form mixed liquor, and the high removal rate of organic matters (BOD) can be achieved within a short time (5-10 min). This initial high-speed removal phenomenon is caused by adsorption. The surface area of the activated sludge is very large (between 2000 and 10000 m)2/m3Mixed liquor) and has a polysaccharide slime layer on the surface, therefore, suspended and colloidal substances in the sewage are flocculated and adsorbed to be removed.
Meanwhile, the residual activated sludge has strong adsorption capacity on heavy metals, the adsorption is mainly realized by physical and chemical processes such as isomorphic molecular force, electrostatic force, ion exchange, complexation, chelation, precipitation and the like, and the adsorption and the ion exchange are main action mechanisms of the residual activated sludge for adsorbing pollutants. Therefore, by utilizing the characteristic of the excess sludge, the excess sludge can be recycled to a certain extent as the sewage pretreatment adsorbent.
(3) Intermediate sedimentation tank
The intermediate sedimentation tank adopts an inclined plate sedimentation tank, receives mixed liquid from the industrial wastewater tank, concentrates and sediments the zoogloea absorbed with a large amount of industrial solute through sedimentation, and discharges settled sludge to the sludge collection tank.
(4) Fenton oxidation pond
And the effluent of the intermediate sedimentation tank enters the Fenton oxidation tank, and the lower part of the intermediate sedimentation tank is provided with a stirrer. The amount of organic matter removed by the sludge in the adsorption tank is limited depending on the type of sewage and the properties of the sludge when in contact with the sewage. If the organic matter in the inlet water is more in suspension and colloid, the COD load removed in the adsorption tank is large; on the contrary, if the amount of soluble organic matters is large, the removal rate of the adsorption tank is limited. Therefore, in order to ensure the water outlet effect, the system is provided with the Fenton oxidation pond. Because the iron ions do not have toxic action on a biochemical system, only the pH needs to be controlled, so that the effluent which does not reach the standard and passes through the coagulating sedimentation tank can also flow back to the SBR reactor for biochemical treatment.
Adding medicament Fe2+And H2O2The chain reaction between the two components catalyzes to generate hydroxyl free radical (. OH) with strong oxidizing property, which can oxidize various toxic and non-degradable organic compounds, in particular to the treatment of high-concentration non-biodegradable wastewater.
The Fenton oxidation pond is constructed to enable the wastewater to be fully and uniformly mixed with the added reagent, so that a stirring and mixing system is arranged at the bottom of the pond. The reinforced adsorption and twice coagulation can reduce the dosage of the medicament, enhance the treatment effect and resist impact.
(5) The coagulating sedimentation tank
In order to further improve the water outlet effect, the coagulation sedimentation tank is arranged behind the Fenton oxidation tank. The process adopts a classical advanced oxidation + PAM (polyacrylamide) coagulating sedimentation process. Because of the large amount of ferrous sulfate added in the Fenton oxidation process, a large amount of ferric ions in the ferrous sulfate are precipitated, a large amount of iron mud is produced, and even a large amount of sludge suspended matters are difficult to precipitate in the wastewater. PAM can be added to strengthen flocculation and precipitation. The addition of the nonionic polyacrylamide in the water can help the sludge to be precipitated quickly, and can further improve the treatment effects of chroma, volatile phenol and COD.
(6) The mud collecting pool
The sludge collecting tank collects partial residual sludge from the SBR reactor, sludge settled in the intermediate sedimentation tank and sludge settled in the coagulating sedimentation tank, and the sludge retention time is not suitable to be too long.
(7) The sludge digestion tank
And the sludge digestion tank receives the system residual sludge from the sludge collection tank, and a proper amount of Fenton reagent is added for continuous stirring to perform sludge digestion. And (4) refluxing the digested supernatant to the industrial wastewater inlet flow for further treatment. The residual sludge of the system after digestion belongs to dangerous waste after being reduced, and is periodically delivered to qualified units for centralized disposal, and the transportation and the storage meet corresponding standards.
Compared with the prior art, the invention has the following advantages:
(1) utilize domestic sewage excess sludge to improve traditional absorption regeneration method, apply to it to poisonous and harmful industrial waste water to carry out the single absorption, guaranteed the activity of zoogloea, the zoogloea polysaccharide content is higher, the stickness is big, and adsorption effect is better, and is more important, has avoided the not complete and digestion loss of regeneration mud self of regeneration. In particular to the waste water treatment in the industries of electroplating, pharmacy, chemical industry and the like.
(2) The existing adsorption regeneration process is improved, the existing original regenerated sludge or secondary sludge after biochemical (or advanced oxidation) is not utilized for adsorption, and fresh unadsorbed domestic sewage excess sludge is used for single adsorption (the sludge is circularly used for multiple times in the existing industry), and the process for adsorbing sludge only stays once, so that the process is suitable for industrial wastewater treatment with large load fluctuation, large toxicity and complex water quality.
(3) The traditional adsorption regeneration process is improved, the SBR process and the existing adsorption regeneration process are combined into a SBR-adsorption process, the process is suitable for miniaturization, the batch and continuous operation is suitable, the sewage of peripheral cells/plant areas can be brought into the treatment process, an integrated treatment device is not required to be additionally arranged, and the cost is reduced.
(4) The adsorption and regeneration stage of the prior art is a separation device (process), and is improved into a process (namely synchronous adsorption regeneration), aeration is added in the industrial wastewater adsorption tank, and adsorption and partial regeneration are simultaneously completed in sludge adsorption. The synchronous regeneration can further improve the pretreatment effect of the adsorption tank, save the occupied area and save the cost.
(5) The process for adsorbing the excess sludge of the single-time domestic sewage by the SBR with synchronous adsorption regeneration is suitable for wastewater with poor biodegradability, biotoxicity, high heavy metal content, complex water quality, large load fluctuation and high excess sludge (hazardous waste) treatment cost. In particular to the waste water treatment in the industries of electroplating, pharmacy, chemical industry and the like.
(6) The sludge digestion process is added in the adsorption process, and the digested supernatant is returned to the inlet water, so that the hazardous waste treatment cost can be reduced and the safety can be improved for the industries generating hazardous wastes (sludge).
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The invention will be described in detail with reference to the following examples.
Example 1
A domestic sewage excess sludge enhanced adsorption industrial wastewater cooperative treatment process comprises an SBR reactor, an industrial wastewater adsorption tank, an intermediate sedimentation tank, a Fenton oxidation tank and a coagulation sedimentation tank which are sequentially connected in series;
wherein the sludge discharging and collecting area of the SBR reactor is communicated with the industrial wastewater adsorption tank;
and the sludge discharging and collecting area of the SBR reactor, the middle sedimentation tank and the bottom of the coagulating sedimentation tank are communicated with a sludge collecting tank.
And a sludge discharge and collection area of the SBR is communicated with the industrial wastewater adsorption tank through a sludge uniform distribution device.
Treating the wastewater containing dimethyl formamide with CODCr1250mg/L、BOD5/CODCr0.012 (pH 3), 7000 times chromaticity and 50m water volume3And d, the wastewater contains a large amount of toxic substances, the biodegradability is poor, and if the biochemical treatment is directly adopted, a large amount of biological floras in the biochemical treatment stage die, so that the biochemical system fails.
The industrial wastewater synergistic treatment process for enhancing the adsorption of the excess sludge is adopted, and the factory domestic sewage enters an SBR reaction tank from a septic tank (an adjusting tank).
The aeration intensity of the SBR reaction tank is 1.2kg of O2Perkg BOD, 4000mg/L MLSS, operating at high load. The PH change atmosphere is 6-8, and the water temperature is 25 ℃; the sludge load adopts 0.06Kg BOD5(iv) Kg MLSS; aerating for 2h, precipitating for 1h, and standing for 2.5 h.
The temperature T in the industrial wastewater adsorption tank is 30 ℃; HRT is adopted for 1 h; MLSS adopts 5.0 g/L; the design flow rate of the intermediate sedimentation tank is 0.5-0.7mm/s, and the HRT is adopted for 30 min.
HRT in the Fenton oxidation pond is adopted for 1 h; PH is 3; fe2+The concentration is 180 mg/L; the adding amount of hydrogen peroxide is 50mmol/L, and the COD is at the momentCrThe removal rate of the method is highest, and the chroma removal effect is good.
The PH value in the coagulating sedimentation tank is 8; the dosage of PAM is 3.0 mg/L; COD, chroma and volatile phenol are further removed.
A sludge collecting pool: SRT took 2 h.
The charging load in the sludge oxidation digestion tank adopts Fe2+＝6000mg/L,H2O2＝3000mg/L。
Adsorbing and removing a large amount of toxic substances in dimethyl formamide wastewater, and adsorbing for 1h and 1h with fenfenOxidation treatment, yielding water CODCrReaches 95.1mg/L, the effective removal rate is 92.4 percent, and the BOD of the effluent water5/CODCrThe ratio is 0.35, the biodegradability is greatly improved, the chromaticity is effectively removed, the digestion rate of a main toxic substance, namely Dimethylformamide (DMF) reaches 99 percent, and the treatment requirement is basically met.
The dosage of the medicament in the sludge digestion tank is reduced. The dimethyl formamide wastewater contains toxic dissolved matters and has a certain effect on sludge digestion, and adsorption of the industrial organic matters with biological toxicity can promote sludge digestion, reduce the usage amount of medicaments in a sludge digestion tank, simultaneously maintain the anaerobic state of sludge digestion, increase the endogenous respiration process of 'secondary excess sludge' and further reduce sludge. The absorbed sludge can adopt the excess sludge generated in chemical plants, parks and peripheral districts, and the excess sludge and the industrial sludge are collected and reduced in coordination, so that the cost for independently treating the excess sludge of the domestic sewage is saved. Can realize sludge recycling to a certain degree.
Example 2
A domestic sewage excess sludge enhanced adsorption industrial wastewater cooperative treatment process comprises an SBR reactor, an industrial wastewater adsorption tank, an intermediate sedimentation tank, a Fenton oxidation tank and a coagulation sedimentation tank which are sequentially connected in series.
Wherein the sludge discharging and collecting area of the SBR reactor is communicated with the industrial wastewater adsorption tank;
and the sludge discharging and collecting area of the SBR reactor, the middle sedimentation tank and the bottom of the coagulating sedimentation tank are communicated with a sludge collecting tank.
And a sludge discharge and collection area of the SBR is communicated with the industrial wastewater adsorption tank through a sludge uniform distribution device.
The industrial wastewater synergistic treatment process for enhancing the adsorption of the excess sludge is adopted, and the factory domestic sewage enters an SBR reaction tank from a septic tank (an adjusting tank).
The process is adopted to treat the production wastewater of the solvent and the coupling agent (the water quality COD of the workshop production wastewater)Cr: 27000mg/L, the chroma is 7000 times, the pH value is 3), the recommended parameters are as follows:
the aeration intensity of the SBR reaction tank is 1.2kg of O2(per Kg of BOD, 4000mg/L of MLSS, high load transportAnd (6) rows. The PH change atmosphere is 6-8, and the water temperature is 25 ℃; the sludge load adopts 0.06Kg BOD5(iv) Kg MLSS; aerating for 2h, precipitating for 1h, and standing for 2.5 h.
The temperature T in the industrial wastewater adsorption tank is 30 ℃; HRT is adopted for 1 h; MLSS adopts 5.0 g/L; the design flow rate of the intermediate sedimentation tank is 0.5-0.7mm/s, and the HRT is adopted for 30 min.
HRT in the Fenton oxidation pond is adopted for 1 h; PH is 3; fe2+The concentration is 180 mg/L; the adding amount of hydrogen peroxide is 50 mmol/L. A sludge collecting pool: SRT took 2 h. The charging load in the sludge oxidation digestion tank adopts Fe2+＝6000mg/L,H2O2＝3000mg/L。
The treatment effect of the wastewater generated in the production of chemical solvents and coupling agents is as follows: the final effluent quality COD is obtained through adsorption and Fenton oxidationCr: 385mg/L, 50 times of chroma and 7-8 of pH value reach the national second-level emission standard, and the treatment effect is good.
Example 3
A domestic sewage excess sludge enhanced adsorption industrial wastewater cooperative treatment process comprises an SBR reactor, an industrial wastewater adsorption tank, an intermediate sedimentation tank, a Fenton oxidation tank and a coagulation sedimentation tank which are sequentially connected in series.
Wherein the sludge discharging and collecting area of the SBR reactor is communicated with the industrial wastewater adsorption tank;
and the sludge discharging and collecting area of the SBR reactor, the middle sedimentation tank and the bottom of the coagulating sedimentation tank are communicated with a sludge collecting tank.
And a sludge discharge and collection area of the SBR is communicated with the industrial wastewater adsorption tank through a sludge uniform distribution device.
The recommended parameters for treating the relevant printing and dyeing wastewater are as follows:
the aeration intensity of the SBR reaction tank is 1.2kg of O2Perkg BOD, 4000mg/L MLSS, operating at high load. The PH change atmosphere is 6-8, and the water temperature is 25 ℃; the sludge load adopts 0.06Kg BOD5(iv) Kg MLSS; aerating for 2h, precipitating for 1h, and standing for 2.5 h.
The temperature T in the industrial wastewater adsorption tank is 30 ℃; HRT is adopted for 1 h; MLSS adopts 5.0 g/L; the design flow rate of the intermediate sedimentation tank is 0.5-0.7mm/s, and the HRT is adopted for 30 min.
HRT in the Fenton oxidation pond is adopted for 1 h; PH is 3; the adding amount of hydrogen peroxide is 45 mmol/L. (Fe)2+)：(H2O2) The molar ratio was 1: 10.
The effluent of certain printing and dyeing wastewater is CODCr1200mg/L, 1000 times of chroma and 7 of pH value, and the Fenton oxidation effluent quality reaches COD after the treatment of the processCr98mg/L, 32 times of chroma reduction, good treatment effect and capability of being recycled as water for workshop production.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (8)
1. The utility model provides a system for utilize domestic sewage excess sludge to strengthen absorption industrial waste water which characterized in that: the system comprises an SBR reactor, an industrial wastewater adsorption tank, an intermediate sedimentation tank, a Fenton oxidation tank and a coagulating sedimentation tank which are sequentially connected in series; wherein the sludge discharging and collecting area of the SBR reactor is communicated with the industrial wastewater adsorption tank; the bottom parts of the sludge discharging and collecting area of the SBR reactor, the middle sedimentation tank and the coagulating sedimentation tank are communicated with a sludge collecting tank;
the sludge discharging and collecting area of the SBR is communicated with the industrial wastewater adsorption tank through a sludge uniform distribution device; the bottom of the industrial wastewater adsorption tank is provided with a stirrer; an aeration pipeline and an aeration head are arranged at the lower part of the industrial wastewater adsorption tank; the intermediate sedimentation tank adopts an inclined plate sedimentation tank; a stirring and mixing system is arranged at the bottom of the Fenton oxidation pond; the sludge collecting tank is communicated with a sludge oxidation digestion tank, and the sludge oxidation digestion tank is communicated with the industrial wastewater adsorption tank.
2. The system for the enhanced adsorption of industrial wastewater by using domestic sewage excess sludge as claimed in claim 1, wherein: the industrial wastewater adsorption tank is provided with a zoogloea.
3. A process for the enhanced adsorption of industrial wastewater by domestic sewage excess sludge using the system of claim 1, characterized in that: the method comprises the following steps: step 1, after domestic sewage enters an SBR reactor for treatment, placing excess sludge in an industrial adsorption tank; step 2, introducing the industrial wastewater to be treated into the industrial wastewater adsorption tank for treatment; step 3, the wastewater treated by the industrial wastewater adsorption tank enters an intermediate sedimentation tank for treatment; step 4, the wastewater treated by the intermediate sedimentation tank enters the Fenton oxidation tank for treatment; and 5, treating the wastewater treated by the Fenton oxidation tank in a coagulating sedimentation tank.
4. The process for the enhanced adsorption of industrial wastewater by using domestic sewage excess sludge according to claim 3, wherein the process comprises the following steps: in the SBR reactor: the aeration intensity is 1.0-1.5kgO2KgBOD, MLSS 1500-5/KgMLSS。
5. The process for the enhanced adsorption of industrial wastewater by using domestic sewage excess sludge according to claim 3, wherein the process comprises the following steps: in the industrial wastewater adsorption tank: t is 25-35 ℃; HRT is 0.5-1 h; MLSS2.5-6.0 g/L.
6. The process for the enhanced adsorption of industrial wastewater by using domestic sewage excess sludge according to claim 3, wherein the process comprises the following steps: in the Fenton oxidation pond: the average retention time HRT of sewage is 20-40min, the pH is 2-4, and Fe2+The concentration is 150-2O2The concentration is 200-280mg/L, H2O2With FeSO4.7H2The molar ratio of O is 1.5-2.5.
7. The process for the enhanced adsorption of industrial wastewater by using domestic sewage excess sludge according to claim 3, wherein the process comprises the following steps: in the coagulating sedimentation tank: the pH value is 7-10, and the dosage of PAM is 2.4-4.0 mg/L.
8. According to claim3 the process for utilizing the domestic sewage excess sludge to strengthen the adsorption of the industrial wastewater is characterized in that: the sludge oxidation digestion tank is characterized in that the adding load is as follows: fe2+＝5000-8000mg/L,H2O2＝3000mg/L。
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| KR20020087799A (en) * | 2001-05-16 | 2002-11-23 | 이찬원 | Method for advanced wastewater treatment using multi-sbr system |
| CN101891343A (en) * | 2010-07-12 | 2010-11-24 | 西安建筑科技大学 | Method for biologically purifying municipal sewage and recovering resources |
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