CN104609667A - Mixed treatment method for wastewater in 1,4-butanediol and ethanediol production - Google Patents
Mixed treatment method for wastewater in 1,4-butanediol and ethanediol production Download PDFInfo
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Abstract
The invention relates to a mixed treatment method for deionized high-concentration organic wastewater in 1,4-butanediol production and high-nitrate wastewater in production of ethanediol by a direct synthesis process for synthesis gas. The method comprises the steps of wastewater copper ion treatment, pH (potential of hydrogen) adjustment, precipitation/denitrification pretreatment, internal circulation anaerobic reaction treatment, hydrolytic acidification/aerobic biochemical reaction treatment, sludge precipitation, ozone strong oxidation pretreatment and biochemical reaction filter pond treatment which are carried out in sequence. The method not only is high in removal efficiency of COD (chemical oxygen demand) in the mixed wastewater and can effectively resist water quality change but also has the characteristics of simple flow process, easiness for implementation and the like. The method also can be applied to separate treatment of the deionized wastewater in the 1,4-butanediol production or the high-nitrate wastewater in the production of ethanediol by the direct synthesis process for synthesis gas as well as treatment of wastewater similar to the wastewater in the two production processes and similar high-concentration organic wastewater in other industries.
Description
Technical field
The present invention relates to a kind of BDO produce in deionizing high concentrated organic wastewater and synthetic gas direct method preparing ethylene glycol produce in the mixed processing method of high nitre waste water, belong to the technical field of waste water processing in environment project.
Background technology
BDO and ethylene glycol are two kinds of important organic and fine chemical materials, and it is widely used in the fields such as medicine, chemical industry, weaving, papermaking, automobile and daily-use chemical industry.The production method of these two kinds of products and pollution condition are:
1, the main production process of 4 butyleneglycols is alkynes aldehyde method, first 1 is produced at metallic copper catalysts conditions, 4-butynediol, 1, the further hydrogenation synthesis 1 of 4-butynediol, 4-butyleneglycol, pollute maximum in this technique, the waste water that generation is maximum is 1, the cleansing phase of 4-butynediol, technique is referred to as BYD deionizing system, this system adopts yin and yang resin to 1, the impurity that cupric ion etc. in 4-butynediol affects specific conductivity removes, after resin absorption is saturated, need the regeneration being carried out resin by strong acid and highly basic, a large amount of waste water containing soda acid is produced in process, wherein containing formaldehyde, 1, 4-butynediol, propiolic alcohol, the pollutent that cupric ion etc. are numerous, the hard-degraded substances such as alkynol, hormesis is had on the one hand to human body skin, hard-degraded substance is easily caused to gather in a large number in aqueous bio on the other hand, the toxicity that final generation is larger, the heavy metals such as Cu in waste water ion, easily accumulate in the biologies such as fish after entering water body, finally cause death, the saltiness of deionizing waste water is high simultaneously, biological growing environment is changed after entering surface water, cause the pollution of soil.
The direct synthesizing glycol technique of synthetic gas adopts CO carbonylation synthesizing dimethyl oxalate, Hydrogenation of Dimethyl Oxalate obtains ethylene glycol, the reaction that the synthesis of the dimethyl oxalate in technique is participated in by methyl alcohol, NO, CO, NO is wherein by Sodium Nitrite and methanol-fueled CLC, produce the waste water of SODIUMNITRATE, the mass content of nitro-compound wherein reaches 1-2%, nitric nitrogen can change the cost of water quality and soil to enrichment in water body, cause the eutrophication of water body, the great balance destroying ecology, has a great impact ecological tool.
1, the complex manufacturing of 4-butyleneglycol and ethylene glycol product, in the production process of catalyst life different time sections, the water quality of its waste water has larger difference, the intractability that such waste water becomes containing nitre material due to high COD concentration and height is large, when often not reaching at present standard and other waste water dual disposals, but the total amount of COD does not still reduce, and causes serious pollution to ecotope.
At present, domestic to 1,4-butyleneglycol deionizing waste water and ethylene glycol height nitre waste water mixing research have no report, engineer applied is little especially, but in the research of process BDO waste water, Chinese patent 201310176235.1 discloses a kind of built-up type process 1, the method of 4-butyleneglycol factory effluent, waste water enters the technique of physico-chemical pretreatment, upflow type anaerobic reactor, aerobic composite biological reaction tank, second pond, coagulating settling tank and biological filter.This technique exists 1, after the mixing of 4-butyleneglycol waste water, cupric ion is untreated, influent COD is low, after anaerobic reaction runs, toxic substance cupric ion is to Antimicrobial effect, go out water unstable etc., effective solution is not provided to the long-chain chemical substance being difficult to degrade simultaneously, when aerobic biochemical cannot process, Strong oxdiative must be adopted to rupture to long-chain chemical substance, reach the easier degradation material needed for deep biochemical.
Summary of the invention
The object of this invention is to provide a kind of 1, 4-butyleneglycol produce in deionizing high concentrated organic wastewater and synthetic gas direct method preparing ethylene glycol produce in the combination treatment technique of high nitre waste water, this technique not only removes the poisonous cupric ion in bioprocesses, and the advantage of collocation two kinds of waste water, reduce the cost adding medicament, to waste water COD, colourity, in waste water 1, 4-butynediol, the materials such as formaldehyde are removed, the concentration with process waste water is high, start the advantages such as fast, the present invention also can be applicable to individual curing 1, deionizing waste water in the production of 4-butyleneglycol, also can individual curing synthetic gas direct method preparing ethylene glycol produce in high nitre waste water, and produce the process of high concentrated organic wastewater close in close waste water quality and other industry with above-mentioned two kinds.
For achieving the above object, the present invention includes carry out successively the process of waste water cupric ion, pH value adjustment, the pre-treatment of precipitation/denitrification, internal circulating anaerobic reaction treatment, acidication/aerobic biochemical reaction treatment, sludge settling, ozone strong oxidizing pre-treatment and biochemical reaction filter tank process.First will from 1, in the production of 4-butyleneglycol, deionizing waste water processes in cupric ion removing process, after making the cupric ion mass content≤0.05mg/l in waste water, in pH regulator is produced with synthetic gas direct method preparing ethylene glycol, high nitre waste water thoroughly mixes, the acescency of composite waste and biological degradability is improved again through denitrification pre-treatment and internal-circulation anaerobic reactor, through acidication/aerobic biochemical reaction tank and secondary sedimentation basins, further reduction waste water COD concentration and realize mud-water separation, enter ozone strong oxidizing reaction and biochemical reaction filter tank more successively, carry out advanced treatment, the Strong oxdiative of ozone is utilized the chemical composition of difficult degradation in waste water to be oxidized to the composition of easily degraded, biological depth degradation is carried out again by biochemical reaction filter tank, reach the object reducing COD in waste water further, water outlet is made to reach primary standard requirement in " integrated wastewater discharge standard " (GB8978-2006), concrete technology is as follows:
The first step, physics and chemistry pretreatment stage:
Prepared by sodium sulfide solution, take sodium sulphite: water=0.5:9.5-2:8 mass ratio, mixes for subsequent use;
Deionizing waste water decopper(ing) ion, 1, sodium sulfide solution is thrown in 4-butyleneglycol production deionizing waste water, injected volume adds with the 5-20 of Cu in waste water ion content amount doubly, ph value after adding is as the criterion for 9-12, then by throwing in 5-40mg Al-based coagulant in often liter of waste water and 2-5mg polyacrylamide flocculates, and in a reservoir fully after mixing, enter in filter press pressure filter, obtain the initial optimization waste water of the mass content≤0.05mg/l of Cu in waste water;
Then pH regulator is carried out to throwing in mineral acid in initial optimization waste water, the injected volume of mineral acid is to meet the requirement of pH value 5-7 in denitrification pre-treatment, then the high nitre waste water in producing with synthetic gas direct method ethylene glycol carries out Homogeneous phase mixing, mixing adopts stirs, air supporting or eddy flow, obtain the waste water that pre-treatment is optimized;
Second step, the biochemical reaction stage:
First denitrification denitrogenation process is carried out to the waste water of pre-treatment optimization, comprise by water distributing area, temperature-controlled area, anti-nitration reaction district, settling region, the denitrification denitrogenation of denitrification backflow and exhalant region composition, wastewater temperature 25-35 DEG C is controlled in temperature-controlled area, polyethylene elastomer filler is thrown in anti-nitration reaction pond, make filler adheres to the denitrification biological bacteria that concentration is greater than 1.0mg/l, inclined-plate clarifying basin is set behind denitrification pond simultaneously, polyethylene swash plate is adopted in settling tank, angle 55 °-60 °, denitrification return flow is greater than 1/3 of total wastewater flow, clarifier sludge reflux ratio 1:1-1.5:1, enter in internal-circulation anaerobic reactor after settling tank and process,
First to comprising by anaerobism circulation tank, recycle pump and waste water solid gas separating device and go out the internal-circulation anaerobic reactor of water pot composition, waste water solid gas separating device carries out being transformed into by upper, the separation hood that lower two layer heights are identical, separation hood angle 60 °, the flow rate of water flow at separator gap place is less than 1.2m/h, ensure that good solid-liquid-gas separating effect, waste water acescency >=25% is made by denitrification, enter in anaerobism circulation tank, anaerobic reactor is sent into again through recycle pump, a water outlet part for anaerobic reactor gets back to circulation tank, the treatment stage that another part entering hydrolytic acidification aerobic biological, recycle ratio controls between 3:1-5:1,
From the waste water of anaerobic reactor, first to comprising reaction tank main body, binding polypropylene elastic filler in the acidication/aerobic biochemical reaction tank of aerator piping system composition, the microbial film concentration that filler adheres to controls at > 4g/l, after biochemical reaction tank, secondary sedimentation basins is set simultaneously, and make sludge reflux to anti-nitration reaction district, aerator piping system drops into pure oxygen in aeration airduct, dosage goes out oxygen in water > 6mg/l to control biochemical Aerobic Pond end reaction pond, temperature is 25-30 DEG C, biochemical reaction terminates to add 50-100mg/m
3alSnSi alloy, the waste water after secondary sedimentation enters ozone strong oxidizing and biochemical filter tank successively, carries out advanced treatment,
3rd step, the advanced treatment stage:
Ozone strong oxidizing is made up of ozonation aerated reaction tank, ozonizer two portions, the ozone concn that ozonizer produces controls at 100-160mg/l, dosage controls according to ozonation aerated reaction tank top ozone concn≤0.1mg/l, the organism being difficult to biochemical treatment in waste water fragments into low molecular material after ozone, and further advanced treatment is carried out in biochemical filter tank afterwards;
Biochemical filter tank manages by setting gradually effluent trough, ceramic grain filter layer, distribution device, filter plate, water inlet water-distributing device and backwash aeration from top to bottom, its structure and backwash mode are shown in Chinese patent 200910050035.5, biochemical filter tank has powerful characterization of adsorption to useless Organic substance in water and dissolved oxygen, carrier has propagate microorganisms simultaneously, waste water through ozone strong oxidizing is easy to carry out biochemical degradation COD, the clearance 87.5-100% of effluent color dilution, alcohol etc., reaches primary standard requirement in " integrated wastewater discharge standard " (GB8978-2006).
Described Al-based coagulant is polymerize aluminum chloride, polyaluminium sulfate, Tai-Ace S 150, alum, selects wherein that one or more mix by any mass ratio.
The present invention also can be applicable to individual curing 1, deionizing waste water in the production of 4-butyleneglycol, or high nitre waste water in the production of individual curing synthetic gas direct method preparing ethylene glycol, and produce the process of high concentrated organic wastewater close in close waste water quality and other industry with above-mentioned two kinds.
accompanying drawing explanation:
Fig. 1 is embodiments of the invention process flow sheet.
Specific embodiments
With reference to accompanying drawing 1.Xinjiang Tianzhi Chenye Chemical Industry Co., Ltd.'s BDO production deionizing waste water water yield is 3300t/h, and it is 1020t/h that ethylene glycol is produced containing the high nitre waste water water yield.Wastewater source: 1. deionizing waste water; 2. ethylene glycol nitric acid neutralized wastewater.
The first step, physics and chemistry pretreatment stage:
Prepared by sodium sulfide solution, take sodium sulphite: water=0.5:9.5-2:8 mass ratio, mixes for subsequent use;
Deionizing waste water decopper(ing) ion, 1, sodium sulfide solution is thrown in 4-butyleneglycol production deionizing waste water, injected volume adds with the 5-20 of Cu in waste water ion content amount doubly, ph value after adding is as the criterion for 9-12, then by throwing in 5-40mg Al-based coagulant in often liter of waste water and 2-5mg polyacrylamide flocculates, and in a reservoir fully after mixing, enter in filter press pressure filter, obtain the initial optimization waste water of the mass content≤0.05mg/l of Cu in waste water;
Then pH regulator is carried out to throwing in mineral acid in initial optimization waste water, the injected volume of mineral acid is to meet the requirement of pH value 5-7 in denitrification pre-treatment, then the high nitre waste water in producing with synthetic gas direct method ethylene glycol carries out Homogeneous phase mixing, mixing adopts stirs, air supporting or eddy flow, obtain the waste water that pre-treatment is optimized;
Second step, the biochemical reaction stage:
First denitrification denitrogenation process is carried out to the waste water of pre-treatment optimization, comprise by water distributing area, temperature-controlled area, anti-nitration reaction district, settling region, the denitrification denitrogenation of denitrification backflow and exhalant region composition, wastewater temperature 25-35 DEG C is controlled in temperature-controlled area, polyethylene elastomer filler is thrown in anti-nitration reaction pond, make filler adheres to the denitrification biological bacteria that concentration is greater than 1.0mg/l, inclined-plate clarifying basin is set behind denitrification pond simultaneously, polyethylene swash plate is adopted in settling tank, angle 55 °-60 °, denitrification return flow is greater than 1/3 of total wastewater flow, clarifier sludge reflux ratio 1:1-1.5:1, enter in internal-circulation anaerobic reactor after settling tank and process,
First to comprising by anaerobism circulation tank, recycle pump and waste water solid gas separating device and go out the internal-circulation anaerobic reactor of water pot composition, waste water solid gas separating device carries out being transformed into by upper, the separation hood that lower two layer heights are identical, separation hood angle 60 °, the flow rate of water flow at separator gap place is less than 1.2m/h, ensure that good solid-liquid-gas separating effect, waste water acescency >=25% is made by denitrification, enter in anaerobism circulation tank, anaerobic reactor is sent into again through recycle pump, a water outlet part for anaerobic reactor gets back to circulation tank, the treatment stage that another part entering hydrolytic acidification aerobic biological, recycle ratio controls between 3:1-5:1,
From the waste water of anaerobic reactor, first to comprising reaction tank main body, binding polypropylene elastic filler in the acidication/aerobic biochemical reaction tank of aerator piping system composition, the microbial film concentration that filler adheres to controls at > 4g/l, after biochemical reaction tank, secondary sedimentation basins is set simultaneously, and make sludge reflux to anti-nitration reaction district, aerator piping system drops into pure oxygen in aeration airduct, dosage goes out oxygen in water > 6mg/l to control biochemical Aerobic Pond end reaction pond, temperature is 25-30 DEG C, biochemical reaction terminates to add 50-100mg/m3 AlSnSi alloy, waste water after secondary sedimentation enters ozone strong oxidizing and biochemical filter tank successively, carry out advanced treatment,
3rd step, the advanced treatment stage:
Ozone strong oxidizing is made up of ozonation aerated reaction tank, ozonizer two portions, the ozone concn that ozonizer produces controls at 100-160mg/l, dosage controls according to ozonation aerated reaction tank top ozone concn≤0.1mg/l, the organism being difficult to biochemical treatment in waste water fragments into low molecular material after ozone, and further advanced treatment is carried out in biochemical filter tank afterwards;
Biochemical filter tank manages by setting gradually effluent trough, ceramic grain filter layer, distribution device, filter plate, water inlet water-distributing device and backwash aeration from top to bottom, its structure and backwash mode are shown in Chinese patent 200910050035.5, biochemical filter tank has powerful characterization of adsorption to useless Organic substance in water and dissolved oxygen, carrier has propagate microorganisms simultaneously, waste water through ozone strong oxidizing is easy to carry out biochemical degradation COD, the clearance 87.5-100% of effluent color dilution, alcohol etc., reaches primary standard requirement in " integrated wastewater discharge standard " (GB8978-2006).
Claims (2)
1. BDO and ethylene glycol produce in the mixed processing method of waste water, it is characterized in that:
(1) physics and chemistry pretreatment stage:
Prepared by sodium sulfide solution, take sodium sulphite: water=0.5:9.5-2:8 mass ratio, mixes for subsequent use;
Deionizing waste water decopper(ing) ion, 1, sodium sulfide solution is thrown in 4-butyleneglycol production deionizing waste water, injected volume adds with the 5-20 of Cu in waste water ion content amount doubly, pH value after adding is that 9-12 is as the criterion, then by throwing in 5-40mg Al-based coagulant in often liter of waste water and 2-5mg polyacrylamide flocculates, and in a reservoir fully after mixing, enter in filter press pressure filter, obtain the initial optimization waste water of the mass content≤0.05mg/l of Cu in waste water;
Then pH regulator is carried out to throwing in mineral acid in initial optimization waste water, the injected volume of mineral acid is to meet the requirement of pH value 5-7 in denitrification pre-treatment, then the high nitre waste water in producing with synthetic gas direct method ethylene glycol carries out Homogeneous phase mixing, mixing adopts stirs, air supporting or eddy flow, obtain the waste water that pre-treatment is optimized;
(2) the biochemical reaction stage:
First denitrification denitrogenation process is carried out to the waste water of pre-treatment optimization, comprise by water distributing area, temperature-controlled area, anti-nitration reaction district, settling region, the denitrification denitrogenation of denitrification backflow and exhalant region composition, wastewater temperature 25-35 DEG C is controlled in temperature-controlled area, polyethylene elastomer filler is thrown in anti-nitration reaction pond, make filler adheres to the denitrification biological bacteria that concentration is greater than 1.0mg/l, inclined-plate clarifying basin is set behind denitrification pond simultaneously, polyethylene swash plate is adopted in settling tank, angle 55 °-60 °, denitrification return flow is greater than 1/3 of total wastewater flow, clarifier sludge reflux ratio 1:1-1.5:1, enter in internal-circulation anaerobic reactor after settling tank and process,
First to comprising by anaerobism circulation tank, recycle pump and waste water solid gas separating device and go out the internal-circulation anaerobic reactor of water pot composition, waste water solid gas separating device carries out being transformed into by upper, the separation hood that lower two layer heights are identical, separation hood angle 60 °, the flow rate of water flow at separator gap place is less than 1.2m/h, ensure that good solid-liquid-gas separating effect, waste water acescency >=25% is made by denitrification, enter in anaerobism circulation tank, anaerobic reactor is sent into again through recycle pump, a water outlet part for anaerobic reactor gets back to circulation tank, the treatment stage that another part entering hydrolytic acidification aerobic biological, recycle ratio controls between 3:1-5:1,
From the waste water of anaerobic reactor, first to comprising reaction tank main body, binding polypropylene elastic filler in the acidication/aerobic biochemical reaction tank of aerator piping system composition, the microbial film concentration that filler adheres to controls at > 4g/l, after biochemical reaction tank, secondary sedimentation basins is set simultaneously, and make sludge reflux to anti-nitration reaction district, aerator piping system drops into pure oxygen in aeration airduct, dosage goes out oxygen in water > 6mg/l to control biochemical Aerobic Pond end reaction pond, temperature is 25-30 DEG C, biochemical reaction terminates to add 50-100mg/m
3alSnSi alloy, the waste water after secondary sedimentation enters ozone strong oxidizing and biochemical filter tank successively, carries out advanced treatment,
(3) the advanced treatment stage:
Ozone strong oxidizing is made up of ozonation aerated reaction tank, ozonizer two portions, the ozone concn that ozonizer produces controls at 100-160mg/l, dosage controls according to ozonation aerated reaction tank top ozone concn≤0.1mg/l, the organism being difficult to biochemical treatment in waste water fragments into low molecular material after ozone, and further advanced treatment is carried out in biochemical filter tank afterwards;
Biochemical filter tank manages by setting gradually effluent trough, ceramic grain filter layer, distribution device, filter plate, water inlet water-distributing device and backwash aeration from top to bottom, biochemical filter tank has powerful characterization of adsorption to useless Organic substance in water and dissolved oxygen, carrier has propagate microorganisms simultaneously, waste water through ozone strong oxidizing is easy to carry out biochemical degradation COD, the clearance 87.5-100% of effluent color dilution, alcohol etc.
2. according to claim 1 a kind of 1,4-butyleneglycol and ethylene glycol produce in the mixed processing method of waste water, it is characterized in that: described Al-based coagulant is polymerize aluminum chloride, polyaluminium sulfate, Tai-Ace S 150, alum, select wherein that one or more mix by any mass ratio.
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Effective date of registration: 20190910 Address after: 832000 No. 1 Quanqi Road, Beiquan Town, Shihezi City, Xinjiang Uygur Autonomous Region Co-patentee after: Xinjiang Tianye (Group) Co., Ltd. Patentee after: XINJIANG TIANZHI CHENYE CHEMICAL CO., LTD. Address before: 832000, No. 36, North East Road, Shihezi Development Zone, the Xinjiang Uygur Autonomous Region, Shihezi Co-patentee before: Xinjiang Tianye (Group) Co., Ltd. Patentee before: XINJIANG TIANZHI CHENYE CHEMICAL CO., LTD. Co-patentee before: Tianneng Chemical Co., Ltd. |
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