CN106830562B - Petrochemical industry industrial wastewater treatment integrated process system and method - Google Patents
Petrochemical industry industrial wastewater treatment integrated process system and method Download PDFInfo
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- C—CHEMISTRY; METALLURGY
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
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- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
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Abstract
The invention provides a petrochemical industry wastewater treatment integrated process system and a method, wherein the system comprises an online monitoring analysis system, an intelligent feedback control system and a wastewater treatment system; the online monitoring and analyzing system is used for monitoring and analyzing the water quality components of the petrochemical industrial wastewater and the water quality components of the effluent of each treatment link and transmitting monitoring and analyzing data to the intelligent feedback control system; the intelligent feedback control system processes the monitoring analysis data and outputs a control signal to the wastewater treatment system; the wastewater treatment system comprises a pretreatment module, an oil removal module, a biochemical module, a sludge treatment module and a deep treatment module; the pretreatment module, the oil removal module, the biochemical module, the advanced treatment module and the sludge treatment module treat petrochemical industry wastewater according to a control signal instruction output by the intelligent feedback control system. The method obtains the treated water with stable indexes of SS, COD, chromaticity and the like which reach the standard through 7 steps.
Description
Technical Field
The invention belongs to the technical field of industrial wastewater treatment, and particularly relates to a petrochemical industrial wastewater treatment integrated process system and a method.
Background
Petrochemical industry is the industry of processing petroleum, natural gas and the like into various chemical products. Petrochemical wastewater is wastewater discharged in the production process of petrochemical enterprises, and sewage source nodes are distributed in various production devices, crude oil tank areas, water supply and drainage workshops and the like. The petrochemical wastewater has various substances, complex composition and high organic matter content, wherein the COD is about 600-1200 mg/L, and the BOD is 200-1000 mg/L; because the catalysts used in the production process are of various types, the wastewater contains various heavy metals, has high toxicity and the characteristic of inhibiting biodegradation, and has serious influence on the surrounding water resources and the ecological environment.
The petrochemical wastewater is a type of industrial wastewater which is difficult to treat and has the following characteristics:
①, the water quality has complex components and more byproducts, and most of reaction raw materials are solvent substances or cyclic structure compounds and the like;
②, the concentration of pollutants in the wastewater is high;
thirdly, many toxic and harmful substances such as halogen compounds, nitro compounds, sulfides, partial surfactants or dispersing agents and the like;
④, the BOD/COD value is low, and the biodegradability is poor;
the chroma of the waste water is high.
The traditional treatment process can solve the problems to a certain extent, but has the conditions of serious secondary pollution, large sludge output after treatment, high energy consumption, effluent quality which can not reach the discharge standard and the like. In recent years, petrochemical enterprises attach more importance to the rapid development of refining and chemical integration, and gradually develop the core industry towards the fine chemical industry, so that the quality of sewage in the chemical enterprises is more and more complex, the requirement of environmental protection is difficult to meet only by relying on the traditional treatment process flow, and the national sewage treatment and discharge standard is difficult to meet.
In addition, the inhibition of biodegradation and the high concentration wastewater which is difficult to biodegrade are the main difficulties in the wastewater treatment of petrochemical enterprises. Whether the part of waste water can be properly treated is the key for influencing the drainage of petrochemical enterprises to reach the emission standard. The chemical or physical method is generally adopted for treating the wastewater at home and abroad, but not all petrochemical wastewater is difficult to degrade, only a small part of wastewater generated by special processes or products is difficult to treat or biochemical treat, and if the incoming water is uniformly subjected to the chemical or physical method, the problem of high operation cost exists and the effect is poor. The invention adopts a modularized intelligent recognition control system aiming at raw water with different water quality conditions, so that sewage selectively enters a reasonable treatment unit, the operation cost is reduced, and the treatment efficiency is improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a petrochemical industry industrial wastewater treatment integrated process system and a method, which are used for carrying out process integration and parametric design treatment on various kinds of wastewater generated in the production process of petrochemical enterprises, and realizing modularization, intellectualization, integration and high efficiency of a wastewater treatment process. The technical scheme of the invention is as follows:
an integrated process system for petrochemical industry wastewater treatment comprises an online monitoring and analyzing system, an intelligent feedback control system and a wastewater treatment system; the online monitoring and analyzing system is used for monitoring and analyzing the water quality components of the petrochemical industrial wastewater and the water quality components of the effluent of each treatment link and transmitting monitoring and analyzing data to the intelligent feedback control system; the intelligent feedback control system processes the monitoring analysis data and outputs a control signal to the wastewater treatment system; the wastewater treatment system comprises a pretreatment module, an oil removal module, a biochemical module, a sludge treatment module and a deep treatment module; the pretreatment module, the oil removal module, the biochemical module, the advanced treatment module and the sludge treatment module treat petrochemical industry wastewater according to a control signal instruction output by the intelligent feedback control system; the pretreatment module comprises a rotational flow grit chamber and a water quality adjusting tank, wherein the inlet of the rotational flow grit chamber is connected with a petrochemical industry industrial wastewater inlet, and the outlet of the rotational flow grit chamber is connected with the inlet of the water quality adjusting tank; the outlet of the water quality adjusting tank is connected with the inlet of the biochemical module; the oil removal module comprises an oil separation tank, a high-strength fiber filtering tank, a rotational flow air flotation tank and an electric flocculation system, wherein the inlet of the oil separation tank is connected with a petrochemical industry industrial wastewater inlet, and the outlet of the oil separation tank is respectively connected with the high-strength fiber filtering tank, the rotational flow air flotation tank and the inlet of the electric flocculation system; the high-strength fiber filtering tank, the rotational flow air flotation tank and the water outlet of the electric flocculation system are connected with the inlet of the biochemical module; the high-strength fiber filtering tank, the rotational flow air flotation tank and the sludge outlet of the electric flocculation system are connected with the sludge treatment module inlet; the biochemical module is divided into two parts, one part comprises a hydrolysis acidification tank, the other part comprises a Fenton oxidation tank, and an outlet of the hydrolysis acidification tank or the Fenton oxidation tank is connected with an inlet of the high-efficiency aerobic bioreactor or the batch type biofilm reactor; the water outlet of the high-efficiency aerobic bioreactor or the intermittent bio-membrane reactor is connected with the inlet of the advanced treatment module; the sludge outlet of the high-efficiency aerobic bioreactor or the intermittent bio-membrane reactor is connected with the inlet of the sludge treatment module; the sludge treatment module comprises a sludge recovery storage tank, a concentration tank and a plate-frame filter press tank which are connected in sequence, and a water outlet of the plate-frame filter press tank is connected with an inlet of the high-efficiency aerobic bioreactor or the batch type biofilm reactor; the advanced treatment module is divided into two parts, one part comprises an ozone activated carbon adsorption tank, and the other part comprises an ultrafiltration membrane filter tank and a reverse osmosis tank which are connected in sequence.
Further, the pretreatment module is also provided with an acid-base adjusting system, and the acid-base adjusting system is connected with the water quality adjusting tank.
Furthermore, the pretreatment module is also provided with a sand washing tank, a sand inlet of the sand washing tank is connected with the rotational flow grit chamber, and a water outlet of the sand washing tank is connected with the water quality adjusting tank.
Further, the oil removal module is also provided with an organic polymer flocculant adding system, and the organic polymer flocculant adding system is connected with the cyclone air flotation tank.
Furthermore, a three-way control valve is arranged on a connecting pipeline of the hydrolysis acidification tank or the Fenton oxidation tank and the high-efficiency aerobic bioreactor or the batch type biofilm reactor.
Furthermore, the biochemical module is also provided with a biological engineering microbial inoculum adding system, and the biological engineering microbial inoculum adding system is connected with the high-efficiency aerobic bioreactor.
An integrated process method for treating petrochemical industry industrial wastewater adopts the system, and comprises the following steps:
step one, monitoring and analyzing the concentration of petroleum substances in petrochemical industrial wastewater on line, entering step two when the concentration of the petroleum substances is less than or equal to 50mg/L, and otherwise entering step three;
step two, starting an operation pretreatment module, introducing petrochemical industry wastewater into a rotational flow grit chamber for sand settling, monitoring the pH value of the wastewater after sand settling, introducing the wastewater after sand settling into a water quality adjusting tank, adding acid or alkali into the water quality adjusting tank when the pH value is more than 8.5 or less than 6.5, adjusting the pH value to be not less than 6.5 and not more than 8.5, and otherwise, directly entering the step four;
step three, starting an oil removal module, introducing petrochemical industrial wastewater into an oil separation tank for primary oil-water separation, monitoring the mass percentage of oil particles with the particle size of 0.1-10 mu m in the wastewater after the primary oil-water separation, and when the mass percentage of the oil particles with the particle size of 0.1-10 mu m is more than 50%, introducing the wastewater subjected to the primary oil-water separation into a cyclone flotation tank for secondary oil-water separation; when the mass percentage of oil particles with the particle size of 0.1-10 mu m is less than or equal to 50% and the mass percentage of dissolved oil with the particle size of less than 0.1 mu m in the oil particles is more than 30%, the wastewater subjected to primary oil-water separation enters an electric flocculation system for secondary oil-water separation, otherwise, the wastewater subjected to primary oil-water separation enters a high-strength fiber filter tank for secondary oil-water separation; all sludge after secondary oil-water separation enters the step six, and all wastewater after secondary oil-water separation enters the step four;
step four, starting the operation of the biochemical module, and monitoring the BOD of the wastewater at the inlet of the biochemical module5COD value, BOD5Introducing the wastewater with COD less than 0.1 into a Fenton oxidation tank for treatment, otherwise, introducing a hydrolysis acidification tank for treatment, and monitoring the TN concentration of the wastewater at the outlet of the Fenton oxidation tank or the hydrolysis acidification tank;
introducing the wastewater with TN concentration of more than 50mg/L into an intermittent biofilm reactor, or else, introducing into a high-efficiency aerobic bioreactor; the sludge from the batch-type biofilm reactor or the high-efficiency aerobic bioreactor enters a sixth step, and the wastewater from the batch-type biofilm reactor or the high-efficiency aerobic bioreactor enters a seventh step;
step six, starting a sludge treatment module, introducing the sludge into a sludge recovery storage tank, a concentration tank and a plate-and-frame filter press in sequence for harmless dehydration treatment, transporting the dehydrated mud cakes outwards, and repeating the step five to the step six after monitoring the TN concentration by using a sludge concentrated solution;
and step seven, starting the advanced treatment module, monitoring the chroma of the wastewater at an inlet of the advanced treatment module, and introducing the wastewater with the chroma of more than 200 and the SS concentration of more than 50mg/L into an ultrafiltration membrane filter tank and a reverse osmosis tank for treatment in sequence, or introducing an ozone activated carbon adsorption tank for treatment.
In the method, the step two of introducing the wastewater into the cyclone grit chamber for sand settling also comprises the steps of cleaning the separated sand settling, and introducing cleaning water into the water quality adjusting tank for subsequent treatment.
In the above methodAnd the operation parameters of the hydrolysis acidification tank in the step four are as follows: the reaction temperature is 22-25 ℃, the hydraulic retention time is 5-6 h, the sludge retention time is 2.5-3 d, and the COD volume load is 10-16 kg/(m)3∙d)。
In the above method, the operating parameters of the ozone activated carbon adsorption tank in the seventh step are as follows: the ozone introducing time is 3-5 min, the ozone introducing amount is 120-140 mg/L, the activated carbon adsorption time is 10-15 min, the diameter of a carbon column is 2-2.5 m, the height of a carbon layer is 2.5-3.0 m, the total retention time is 25-30 min, and the flow ratio of ozone to wastewater from the biochemical treatment module (3.5-4.0) is 1.
The invention has the beneficial effects that: the invention can flexibly start high-efficiency and stable treatment process combination aiming at the characteristics and treatment difficulties of petrochemical industrial wastewater with different properties so as to realize the optimized configuration of the treatment process, and has high integration, intellectualization and modularization degree; the indexes of the petrochemical industrial wastewater treated by the method, such as SS, COD, chromaticity and the like, stably reach the standard, and the effluent can be recycled; in addition, the invention is beneficial to the mutual conversion of technology and integrated equipment, can also effectively save the treatment space of petrochemical industry industrial wastewater, has reliable process operation and higher industrialization value.
Drawings
FIG. 1 is a schematic structural diagram of an integrated petrochemical industrial wastewater treatment process system of the present invention, wherein a, a multi-parameter full-automatic water quality detection analyzer, b, a PLC programmable logic controller, c, a pretreatment module, e, an oil removal module, d, a biochemical module, g, a deep treatment module, f, a sludge treatment module; 1-cyclone sand settling tank, 2-water quality adjusting tank, 3-hydrolytic acidification tank, 4-Fenton oxidation tank, 5-high-efficiency aerobic bioreactor, 6-batch biofilm reactor, 7-ozone activated carbon adsorption tank, 8-ultrafiltration membrane filter tank UF, 9-reverse osmosis tank, 10-oil separation tank, 11-sand washing tank, 12-high strength fiber filter tank, 13-cyclone air flotation tank, 14-organic polymer flocculant adding system, 15-electric flocculation system, 16-sludge recovery storage tank, 17-concentration tank, 18-plate frame pressure filter tank, 19-acid-base adjusting system and 20-bioengineering microbial inoculum adding system.
Detailed Description
The present invention will now be described in further detail with reference to the following figures and specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention provides a petrochemical industry industrial wastewater treatment integrated process system, which has a structure shown in figure 1 and comprises an online monitoring and analyzing system, an intelligent feedback control system and a wastewater treatment system, wherein the online monitoring and analyzing system is a multi-parameter full-automatic water quality detection analyzer a and is used for monitoring and analyzing the water quality components of petrochemical industry industrial wastewater and the water quality components of effluent water of each treatment link and transmitting monitoring and analyzing data to the intelligent feedback control system; the intelligent feedback control system is specifically a PLC (programmable logic controller) b and is used for outputting a control signal to the wastewater treatment system after the monitoring analysis data is processed.
The wastewater treatment system comprises a pretreatment module c, an oil removal module e, a biochemical module d, a sludge treatment module f and an advanced treatment module g; the pretreatment module c, the oil removal module e, the biochemical module d, the advanced treatment module g and the sludge treatment module f treat the petrochemical industry wastewater according to a control signal instruction output by the PLC b.
The pretreatment module c comprises a rotational flow grit chamber 1 and a water quality adjusting tank 2, wherein the inlet of the rotational flow grit chamber 1 is connected with a petrochemical industry industrial wastewater inlet, and the outlet of the rotational flow grit chamber is connected with the inlet of the water quality adjusting tank 2; the outlet of the water quality adjusting tank 2 is connected with the inlet of the biochemical module d; the pretreatment module c is also provided with an acid-base adjusting system 19 and a sand washing tank 11, the acid-base adjusting system 19 is connected with the water quality adjusting tank 2, and the acid-base adjusting system 19 is used for controlling the addition of quicklime or sulfuric acid to adjust the pH value in the water quality adjusting tank; the sand inlet of the sand washing tank 11 is connected with the rotational flow grit chamber 1, and the water outlet is connected with the water quality adjusting tank 2.
The oil removal module e comprises an oil separation tank 10, a high-strength fiber filtering tank 12, a rotational flow air flotation tank 13 and an electric flocculation system 15, wherein the inlet of the oil separation tank 10 is connected with a petrochemical industry industrial wastewater inlet, and the outlet of the oil separation tank is respectively connected with the inlets of the high-strength fiber filtering tank 12, the rotational flow air flotation tank 13 and the electric flocculation system 15; the water outlets of the high-strength fiber filtering tank 12, the rotational flow air flotation tank 13 and the electric flocculation system 15 are connected with the inlet of the biochemical module d; the sludge outlets of the high-strength fiber filtering tank 12, the rotational flow air flotation tank 13 and the electric flocculation system 15 are connected with the inlet of the sludge treatment module f; the oil removal module e is further provided with an organic polymer flocculant adding system 14, the organic polymer flocculant adding system 14 is connected with the cyclone air flotation tank 13, and the organic polymer flocculant adding system 14 is used for controlling organic polymer flocculant to be added into the cyclone air flotation tank 13.
The biochemical module d is divided into two parts, one part comprises a hydrolysis acidification tank 3, the other part comprises a Fenton oxidation tank 4, and the outlet of the hydrolysis acidification tank 3 or the Fenton oxidation tank 4 is connected with the inlet of a high-efficiency aerobic bioreactor 5 or an intermittent biofilm reactor 6; the water outlet of the high-efficiency aerobic bioreactor 5 or the water outlet of the intermittent biofilm reactor 6 is connected with the inlet of the advanced treatment module g; the sludge outlet of the high-efficiency aerobic bioreactor 5 or the intermittent bio-membrane reactor 6 is connected with the inlet of the sludge treatment module f; a three-way control valve is arranged on a connecting pipeline of the hydrolysis acidification tank 3 or the Fenton oxidation tank 4 and the high-efficiency aerobic bioreactor 5 or the intermittent biofilm reactor 6; the biochemical module d is also provided with a biological engineering microbial inoculum adding system 20, the biological engineering microbial inoculum adding system 20 is connected with the high-efficiency aerobic bioreactor 5, and the biological engineering microbial inoculum adding system 20 is used for controlling the biological microbial inoculum to be added into the high-efficiency aerobic bioreactor 5.
The sludge treatment module f comprises a sludge recovery storage tank 16, a concentration tank 17 and a plate frame pressure filter 18 which are connected in sequence, and a water outlet of the plate frame pressure filter 18 is connected with an inlet of the high-efficiency aerobic bioreactor 5 or an inlet of the batch type biofilm reactor 6.
The advanced treatment module g is divided into two parts, one part comprises an ozone activated carbon adsorption tank 7, the other part comprises an ultrafiltration membrane filtering tank 8 and a reverse osmosis tank 9 which are sequentially connected, and the water discharged from the reverse osmosis tank is qualified water with indexes such as SS, COD and chromaticity which reach the standard stably.
The invention also provides a petrochemical industry industrial wastewater treatment integrated process method, which adopts the system and comprises the following steps:
step one, monitoring and analyzing the concentration of petroleum substances in petrochemical industrial wastewater on line, entering step two when the concentration of the petroleum substances is less than or equal to 50mg/L, and otherwise entering step three;
step two, starting an operation pretreatment module, introducing petrochemical industry wastewater into a cyclone grit chamber for sand settling, cleaning separated grit, monitoring the pH value of the wastewater after sand settling, combining the wastewater after sand settling and grit cleaning water, introducing the combined wastewater into a water quality adjusting tank, adding acid or alkali into the water quality adjusting tank when the pH value is more than 8.5 or less than 6.5, adjusting the pH value to be not less than 6.5 and not more than 8.5, or directly entering the step four;
step three, starting an oil removal module, introducing petrochemical industrial wastewater into an oil separation tank for primary oil-water separation, monitoring the mass percentage of oil particles with the particle size of 0.1-10 mu m in the wastewater after the primary oil-water separation, and when the mass percentage of the oil particles with the particle size of 0.1-10 mu m is more than 50%, introducing the wastewater subjected to the primary oil-water separation into a cyclone flotation tank for secondary oil-water separation; when the mass percentage of oil particles with the particle size of 0.1-10 mu m is less than or equal to 50% and the mass percentage of dissolved oil with the particle size of less than 0.1 mu m in the oil particles is more than 30%, the wastewater subjected to primary oil-water separation enters an electric flocculation system for secondary oil-water separation, otherwise, the wastewater subjected to primary oil-water separation enters a high-strength fiber filter tank for secondary oil-water separation; all sludge after secondary oil-water separation enters the step six, and all wastewater after secondary oil-water separation enters the step four;
step four, starting the operation of the biochemical module, and monitoring the BOD of the wastewater at the inlet of the biochemical module5COD value, BOD5Introducing the wastewater with COD less than 0.1 into a Fenton oxidation tank for treatment, otherwise, introducing a hydrolysis acidification tank for treatment, and monitoring the TN concentration of the wastewater at the outlet of the Fenton oxidation tank or the hydrolysis acidification tank; wherein the operation parameters of the hydrolysis acidification tank are as follows: the reaction temperature is 22-25 ℃, the hydraulic retention time is 5-6 h, the sludge retention time is 2.5-3 d, and the COD volume load is 10-16 kg/(m)3∙d)；
Introducing the wastewater with TN concentration of more than 50mg/L into an intermittent biofilm reactor, or else, introducing into a high-efficiency aerobic bioreactor; the sludge from the batch-type biofilm reactor or the high-efficiency aerobic bioreactor enters a sixth step, and the wastewater from the batch-type biofilm reactor or the high-efficiency aerobic bioreactor enters a seventh step;
step six, starting a sludge treatment module, introducing the sludge into a sludge recovery storage tank, a concentration tank and a plate-and-frame filter press in sequence for harmless dehydration treatment, transporting the dehydrated mud cakes outwards, and repeating the step five to the step six after monitoring the TN concentration by using a sludge concentrated solution;
step seven, starting the advanced treatment module, monitoring the chroma of the wastewater at the inlet of the advanced treatment module, and introducing the wastewater with the chroma of more than 200 and the SS concentration of more than 50mg/L into an ultrafiltration membrane filter tank and a reverse osmosis tank for treatment in sequence, or introducing an ozone activated carbon adsorption tank for treatment; wherein the operating parameters of the ozone activated carbon adsorption tank are as follows: introducing ozone for 3-5 min, introducing ozone with the oxygen amount of 120-140 mg/L, adsorbing with active carbon for 10-15 min, controlling the diameter of a carbon column to be 2-2.5 m, controlling the height of a carbon layer to be 2.5-3.0 m, controlling the total retention time to be 25-30 min, and controlling the flow ratio of ozone to wastewater from the biochemical treatment module to be (3.5-4.0) to be 1; the indexes of SS, COD, chromaticity and the like of the treated water stably reach the standard.
The invention carries out integrated treatment on petrochemical wastewater with different water quality sources, and the treatment results are as follows:
example 1
The quality of the wastewater from petrochemical A plant is as follows 1:
TABLE 1 quality of petrochemical A plant wastewater
TABLE 2 particle size ratio of petroleum in wastewater
The full-automatic water quality detection analyzer of start-up on-line monitoring analytic system multi-parameter carries out monitoring analysis to the petrochemical wastewater that gets into the system and the quality of water of each control node, and analysis petrochemical wastewater quality of water composition, according to the composition parameter, PLC programmable logic controller selects wastewater treatment system's specific start-up module, specifically is:
monitoring the concentration of petroleum substances in inlet water of petrochemical wastewater =32.6 and is less than or equal to 50mg/L, and enabling the wastewater to enter a rotational flow grit chamber;
monitoring the pH =8.8 and more than 8.5 of the wastewater in the water quality adjusting tank, and adding sulfuric acid into an acid-base adjusting system to adjust until the pH is not less than 6.5 and not more than 8.5;
monitoring BOD of mixed wastewater entering biochemical module5The COD =0.295 > 0.1, the wastewater enters a hydrolysis acidification tank, and the operation parameters of a hydrolysis acidification reactor are as follows: t =25 ℃, Hydraulic Retention Time (HRT) =5.5h, Sludge Retention Time (SRT) =2.75d, COD volume load 13 kg/(m)3∙d)；
Monitoring TN concentration =60 > 50mg/L of the mixed wastewater at the outlet of the hydrolysis acidification tank, and enabling the wastewater to enter an intermittent biofilm reactor;
the chroma of the mixed wastewater entering the advanced treatment module is monitored (dilution multiple method) =346 > 200, and SS =76 > 50mg/L, and the wastewater enters an ultrafiltration membrane filter tank UF and reverse osmosis RO.
The wastewater treated by the integrated process system of the embodiment has the advantages that the concentration of petroleum substances is 7 mg/L, the concentration of COD is 35-55 mg/L, the concentration of SS is 8-13 mg/L, the concentration of TN is 10-15 mg/L, the chroma (dilution multiple) is 10-19, and the average removal rates of petroleum substances, COD, SS, TN and chroma (dilution multiple) are 82-94%, 91-96%, 71-82%, 90-95% and 93-98% respectively.
Example 2
The quality of the petrochemical B plant wastewater is as follows 3:
TABLE 3 quality of wastewater from petrochemical B plant
TABLE 4 particle size ratio of petroleum in wastewater
The full-automatic water quality detection analyzer of start-up on-line monitoring analytic system multi-parameter carries out monitoring analysis to the petrochemical wastewater that gets into the system and the quality of water of each control node, and analysis petrochemical wastewater quality of water composition, according to the composition parameter, PLC programmable logic controller selects wastewater treatment system's specific start-up module, specifically is:
monitoring the concentration of petroleum substances =58.4 > 50mg/L in the inlet water of petrochemical wastewater, starting an oil removal module, and enabling the wastewater to enter an oil separation tank; monitoring the proportion of emulsified oil (the grain diameter of oil is 0.1-10 mu m) in the effluent of the oil separation tank to be less than 15% and less than 50%, and the proportion of dissolved oil (the grain diameter of oil is less than 0.1 mu m) to be less than 5 and less than 30%, and enabling the wastewater to enter a high-strength fiber filter tank;
monitoring BOD of mixed wastewater entering biochemical module5The COD =0.25 > 0.1, the wastewater enters a hydrolysis acidification tank, and the operation parameters of a hydrolysis acidification reactor are as follows: t =25 ℃, Hydraulic Retention Time (HRT) =5h, Sludge Retention Time (SRT) =2.5d, COD volume load 10 kg/(m)3∙d)；
Monitoring TN concentration of the mixed wastewater at the outlet of the hydrolysis acidification tank =45 and less than 50mg/L, and enabling the wastewater to enter a high-efficiency aerobic bioreactor;
and (3) monitoring the chromaticity of the mixed wastewater entering the advanced treatment module (dilution multiple method) =240 > 200 and SS > 50mg/L, and enabling the wastewater to enter an ultrafiltration membrane filter tank and reverse osmosis.
The wastewater treated by the integrated process system of the embodiment has the advantages that the concentration of petroleum substances is 5mg/L, the concentration of COD is 30-50 mg/L, the concentration of SS is 5-10 mg/L, the concentration of TN is 5-15 mg/L, the chroma (dilution multiple) is 5-9, and the average removal rates of petroleum substances, COD, SS, TN and chroma (dilution multiple) are 80-95%, 90-95%, 75-86%, 92-99% and 94-98% respectively.
It will be understood that modifications and variations can be resorted to by those skilled in the art, and that all such modifications and variations are intended to be within the scope of the invention as claimed.
Claims (9)
1. An integrated process method for treating petrochemical industrial wastewater is characterized by comprising the following steps:
step one, monitoring and analyzing the concentration of petroleum substances in petrochemical industrial wastewater on line, entering step two when the concentration of the petroleum substances is less than or equal to 50mg/L, and otherwise entering step three;
step two, starting an operation pretreatment module, introducing petrochemical industry wastewater into a rotational flow grit chamber for sand settling, monitoring the pH value of the wastewater after sand settling, introducing the wastewater after sand settling into a water quality adjusting tank, adding acid or alkali into the water quality adjusting tank when the pH value is more than 8.5 or less than 6.5, adjusting the pH value to be not less than 6.5 and not more than 8.5, and otherwise, directly entering the step four;
step three, starting an oil removal module, introducing petrochemical industrial wastewater into an oil separation tank for primary oil-water separation, monitoring the mass percentage of oil particles with the particle size of 0.1-10 mu m in the wastewater after the primary oil-water separation, and when the mass percentage of the oil particles with the particle size of 0.1-10 mu m is more than 50%, introducing the wastewater subjected to the primary oil-water separation into a cyclone flotation tank for secondary oil-water separation; when the mass percentage of oil particles with the particle size of 0.1-10 mu m is less than or equal to 50% and the mass percentage of dissolved oil with the particle size of less than 0.1 mu m in the oil particles is more than 30%, the wastewater subjected to primary oil-water separation enters an electric flocculation system for secondary oil-water separation, otherwise, the wastewater subjected to primary oil-water separation enters a high-strength fiber filter tank for secondary oil-water separation; all sludge after secondary oil-water separation enters the step six, and all wastewater after secondary oil-water separation enters the step four;
step four, starting the operation of the biochemical module, and monitoring the BOD of the wastewater at the inlet of the biochemical module5COD value, BOD5Introducing the wastewater with COD less than 0.1 into a Fenton oxidation tank for treatment, otherwise, introducing a hydrolysis acidification tank for treatment, and monitoring the TN concentration of the wastewater at the outlet of the Fenton oxidation tank or the hydrolysis acidification tank;
introducing the wastewater with TN concentration of more than 50mg/L into an intermittent biofilm reactor, or else, introducing into a high-efficiency aerobic bioreactor; the sludge from the batch-type biofilm reactor or the high-efficiency aerobic bioreactor enters a sixth step, and the wastewater from the batch-type biofilm reactor or the high-efficiency aerobic bioreactor enters a seventh step;
step six, starting a sludge treatment module, introducing the sludge into a sludge recovery storage tank, a concentration tank and a plate-and-frame filter press in sequence for harmless dehydration treatment, transporting the dehydrated mud cakes outwards, and repeating the step five to the step six after monitoring the TN concentration by using a sludge concentrated solution;
step seven, starting the advanced treatment module, monitoring the chroma of the wastewater at the inlet of the advanced treatment module, and introducing the wastewater with the chroma of more than 200 and the SS concentration of more than 50mg/L into an ultrafiltration membrane filter tank and a reverse osmosis tank for treatment in sequence, or introducing an ozone activated carbon adsorption tank for treatment;
the system adopted by the petrochemical industry industrial wastewater treatment integrated process method is specifically a petrochemical industry industrial wastewater treatment integrated process system, and comprises an online monitoring and analyzing system, an intelligent feedback control system and a wastewater treatment system; the online monitoring and analyzing system is used for monitoring and analyzing the water quality components of the petrochemical industrial wastewater and the water quality components of the effluent of each treatment link and transmitting monitoring and analyzing data to the intelligent feedback control system; the intelligent feedback control system processes the monitoring analysis data and outputs a control signal to the wastewater treatment system; the wastewater treatment system comprises a pretreatment module, an oil removal module, a biochemical module, a sludge treatment module and a deep treatment module; the pretreatment module, the oil removal module, the biochemical module, the advanced treatment module and the sludge treatment module treat petrochemical industry wastewater according to a control signal instruction output by the intelligent feedback control system; the pretreatment module comprises a rotational flow grit chamber and a water quality adjusting tank, wherein the inlet of the rotational flow grit chamber is connected with a petrochemical industry industrial wastewater inlet, and the outlet of the rotational flow grit chamber is connected with the inlet of the water quality adjusting tank; the outlet of the water quality adjusting tank is connected with the inlet of the biochemical module; the oil removal module comprises an oil separation tank, a high-strength fiber filtering tank, a rotational flow air flotation tank and an electric flocculation system, wherein the inlet of the oil separation tank is connected with a petrochemical industry industrial wastewater inlet, and the outlet of the oil separation tank is respectively connected with the high-strength fiber filtering tank, the rotational flow air flotation tank and the inlet of the electric flocculation system; the high-strength fiber filtering tank, the rotational flow air flotation tank and the water outlet of the electric flocculation system are connected with the inlet of the biochemical module; the high-strength fiber filtering tank, the rotational flow air flotation tank and the sludge outlet of the electric flocculation system are connected with the sludge treatment module inlet; the biochemical module is divided into two parts, one part comprises a hydrolysis acidification tank, the other part comprises a Fenton oxidation tank, and an outlet of the hydrolysis acidification tank or the Fenton oxidation tank is connected with an inlet of the high-efficiency aerobic bioreactor or the batch type biofilm reactor; the water outlet of the high-efficiency aerobic bioreactor or the intermittent bio-membrane reactor is connected with the inlet of the advanced treatment module; the sludge outlet of the high-efficiency aerobic bioreactor or the intermittent bio-membrane reactor is connected with the inlet of the sludge treatment module; the sludge treatment module comprises a sludge recovery storage tank, a concentration tank and a plate-frame filter press tank which are connected in sequence, and a water outlet of the plate-frame filter press tank is connected with an inlet of the high-efficiency aerobic bioreactor or the batch type biofilm reactor; the advanced treatment module is divided into two parts, one part comprises an ozone activated carbon adsorption tank, and the other part comprises an ultrafiltration membrane filter tank and a reverse osmosis tank which are connected in sequence.
2. The integrated process method for treating petrochemical industry industrial wastewater according to claim 1, wherein the step two of introducing wastewater into the cyclone grit chamber for grit, further comprises cleaning the separated grit, and introducing cleaning water into the water quality adjusting tank for subsequent treatment.
3. The petrochemical industry industrial wastewater treatment integrated process method according to claim 1, wherein the operation parameters of the hydrolysis acidification tank of the step four are as follows: the reaction temperature is 22-25 ℃, the hydraulic retention time is 5-6 h, the sludge retention time is 2.5-3 d, and the COD volume load is 10-16 kg/(m)3∙d)。
4. The petrochemical industry industrial wastewater treatment integrated process method according to claim 1, wherein the operating parameters of the ozone activated carbon adsorption tank of the seventh step are as follows: the ozone introducing time is 3-5 min, the ozone introducing amount is 120-140 mg/L, the activated carbon adsorption time is 10-15 min, the diameter of a carbon column is 2-2.5 m, the height of a carbon layer is 2.5-3.0 m, the total retention time is 25-30 min, and the flow ratio of ozone to wastewater from the biochemical treatment module (3.5-4.0) is 1.
5. The petrochemical industry industrial wastewater treatment integrated process method according to claim 1, wherein the pretreatment module is further provided with an acid-base regulation system, and the acid-base regulation system is connected with the water quality regulation tank.
6. The petrochemical industry industrial wastewater treatment integrated process method according to claim 5, wherein the pretreatment module is further provided with a sand washing tank, a sand inlet of the sand washing tank is connected with the rotational flow grit chamber, and a water outlet of the sand washing tank is connected with the water quality adjusting tank.
7. The petrochemical industry industrial wastewater treatment integrated process method according to claim 1, wherein the oil removal module is further provided with an organic polymeric flocculant dosing system, and the organic polymeric flocculant dosing system is connected with the cyclone flotation tank.
8. The integrated process method for treating petrochemical industrial wastewater according to claim 1, wherein a three-way control valve is disposed on a connecting pipeline between the hydrolysis acidification tank or the Fenton oxidation tank and the high-efficiency aerobic bioreactor or the batch type biofilm reactor.
9. The integrated process method for treating petrochemical industrial wastewater according to claim 1, wherein the biochemical module is further provided with a biological engineering microbial inoculum adding system, and the biological engineering microbial inoculum adding system is connected with the high-efficiency aerobic bioreactor.
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