CN104609640A - Comprehensive treatment method of sebacic acid production wastewater - Google Patents
Comprehensive treatment method of sebacic acid production wastewater Download PDFInfo
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- CN104609640A CN104609640A CN201310540100.9A CN201310540100A CN104609640A CN 104609640 A CN104609640 A CN 104609640A CN 201310540100 A CN201310540100 A CN 201310540100A CN 104609640 A CN104609640 A CN 104609640A
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- sebacic acid
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- acid production
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Abstract
The invention belongs to the technical field of wastewater treatment and recycling, and discloses a comprehensive treatment method of sebacic acid production wastewater. The sebacic acid production wastewater sequentially goes through an extraction device, a biochemical device, an advanced treatment device and an evaporative desalination device in order to realize treatment of the sebacic acid production wastewater, wherein a cycle mother liquor generated in the evaporation device returns to the biochemical device in order to carry treatment. The method allows phenol and sodium sulfate in the sebacic acid production wastewater to be recovered, and also allows treated wastewater to be directly reused. The method has the advantages of simple enforcement steps, maximal reduction of the sewage discharge capacity and pollutant transfer, and true realization of the zero discharge of sebacic acid wastewater treatment.
Description
Technical field
The invention belongs to wastewater treatment and resource technology field, specifically high concentration sodium sulfate sebacic acid waste water is carried out to the method for comprehensive treating process, thus recycle the useful matter in waste water as far as possible, and at utmost reduce the quantity discharged of waste water and pollutent.
Background technology
Sebacic acid a kind ofly important has valency industrial chemicals.China is sebacic acid producing country maximum in the world, and main employing Viscotrol C is the cracking process production technique of raw material at present.Produce sebacic acid per ton and need consume 150 ~ 250kg phenol, produce 25 ~ 40 tons of waste water, wherein phenol content is 2000 ~ 5000mg/L, pH is 2 ~ 3, sodium sulphate content is 5 ~ 15%, COD content is 10000 ~ 20000mg/L.
The most ripe treatment process of current sebacic acid factory effluent is " extraction → evaporation → biochemical ", and water outlet COD < 40mg/L, also can be back to production after advanced treatment.But vapo(u)rization system influent COD reaches 2000 ~ 20000mg/L in this technique, there are the following problems to cause the operation of vapo(u)rization system:
(1) circulating mother liquor generation is large, goes back the economically viable treatment process of neither one at present.If do not discharge, easily cause vapo(u)rization system to occur blocking or non-crystallizable phenomenon, cause regular break-down maintenance, affect the continuous prodution of enterprise and the raising of integral production efficiency.
(2) circulating mother liquor is high salt height COD waste liquid, and in evaporative crystallization sodium sulfate, organic content is greater than 1%, also containing other impurity, belongs to slag salt, if can not properly be disposed, and possible serious environment pollution; If strict regulations processes, enterprise's waste water control comprehensive cost is by increase by tens times.
Also lack one at present can solve the problem and economically viable method.
Summary of the invention
The technical problem to be solved in the present invention is the mother liquid evaporation disposal difficulties that the direct evaporative desalination of sebacic acid waste water produces.The object of the invention is for the deficiencies in the prior art, a kind of method is provided, the method can realize sebacic acid waste water treatment and reuse up to standard, reclaim the generation of circulating mother liquor in phenol in waste water and sodium sulfate, minimizing evaporative process, avoid the generation of slag salt, improve the stability that whole sebacic acid Waste Water Treatment runs.
Thinking of the present invention: sebacic acid waste water, except after phenol, carries out purifying treatment before entering evaporative desalination system, except organism, sulfide, suspended substance and other impurity in anhydrating, can reach the effect of two aspects thus:
1. directly obtain clean water of condensation and technical grade sodium sulfate after waste water evaporative desalination, without the need to after processing further just can direct reuse with sell.
2. in vapo(u)rization system, the generation of circulating mother liquor reduces more than 90%, will greatly improve stability and the work-ing life of vapo(u)rization system operation.
Technical problem to be solved by this invention is realized by following technical scheme.The present invention is a kind of integrated conduct method of sebacic acid factory effluent, be characterized in: described sebacic acid waste water processes in interior system through extraction plant, biochemical device, advanced treatment apparatus and evaporative desalination device successively, wherein, the circulating mother liquor that evaporative desalination device produces is got back to biochemical device and is processed.
In the integrated conduct method of sebacic acid factory effluent of the present invention, preferred technical scheme or technical characteristic are further:
1. extraction plant is using ricinolic acid, sec-octyl alcohol, QH complexing extractant, ethylene dichloride or other Examples of non-aqueous solvents as extraction agent.
2. the technique that biochemical device is taked is " acidication+aerobic " technique, processes, degradation of organic substances and sulfide oxidation to water after extraction.
3. its processing parameter is preferably respectively: acidication: HRT=8 ~ 48h, MLSS=4000 ~ 20000mg/L, F/M=0.1 ~ 0.4; Aerobic: HRT=12 ~ 72h, MLSS=2000 ~ 5000mg/L, dissolved oxygen 2.0 ~ 4.0mg/L, F/M=0.2 ~ 1.0.
4. advanced treatment apparatus comprises flocculation plant and filtration unit, makes bio-chemical effluent after treatment, colloid wherein and concentration of suspension < 1mg/L.
5. evaporative desalination device is MVR, the evaporation condensed water direct reuse obtained.
In the inventive method, the object of extraction plant is phenol in removing sebacic acid factory effluent and is back to production.Sebacic acid factory effluent can select multi-solvents to extract, and comprises ricinolic acid, sec-octyl alcohol, QH complexing extractant, ethylene dichloride or other Examples of non-aqueous solvents.Extraction efficiency, the extraction process difference to some extent of different extraction agent, should select according to practical situation.Such as, ricinolic acid is the raw material in sebacic acid production process, containing the extraction liquid direct reuse of phenol, need not strip; Its extraction process is comparatively simple, but extraction efficiency relative mistake, after extraction, the COD > 4000mg/L of water, brings larger burden to the subsequent disposal of waste water.Sec-octyl alcohol is the intermediate product in sebacic acid production process, lower as extraction agent expense with it; Sec-octyl alcohol extraction efficiency is higher than ricinolic acid, but need to carry out extraction and back-extraction to get simultaneously, after its extraction, water COD is 2000 ~ 3000mg/L, the extraction efficiency of complexing extractant to sebacic acid factory effluent is the highest, such as adopt waste water COD after the extraction of QH complexing extractant to be 1000 ~ 1500mg/L, and cost of water treatment after extraction lower than ricinolic acid and sec-octyl alcohol as extraction agent.
The extraction of sebacic acid waste water is except after phenol, and do not dilute through biochemical device process, biochemical process is " acidication+aerobic ".Biochemical treatment can be lower running cost degradation water in organism and sulfide.
After the process of sebacic acid wastewater biochemical, bio-chemical effluent COD is lower, but also containing suspended substance, colloid and other impurity in waste water.If now directly carry out evaporation process, can not ensure that the sodium sulfate that evaporative desalination obtains has good quality, therefore need further advanced treatment after the process of sebacic acid wastewater biochemical, use water-borne glue body and total suspended solids < 1mg/L.Advanced treatment apparatus of the present invention comprises flocculation, absorption and filtration unit.Flocculation plant can adopt chemical flocculation and electricity flocculation; Adsorption unit adopts gac as absorption filtering material; Filtration unit adopts more medium filter, micro-filtration or ultrafiltration.
Enter evaporative desalination system through the sebacic acid waste water of above-mentioned process to process.The multiple-effect evaporation that evaporative desalination process selection energy consumption is lower, wherein best evaporative desalination system is four-effect evaporation and MVR, and wherein MVR cost of investment is higher, but running cost is minimum.
Beneficial effect of the present invention:
(1) vapo(u)rization system influent COD < 100mg/L, vapo(u)rization system circulating mother liquor generation comparatively prior art reduces more than 90%, greatly improves the stability that vapo(u)rization system is run thus, thus improves the efficiency of whole Waste Water Treatment.
(2) the evaporation condensed water COD < 40mg/L of vapo(u)rization system acquisition, the indexs such as its colourity, SS, turbidity all meet produces quality of reused water standard, can directly as producing reuse water.
(3) the sodium sulfate crystal purity that vapo(u)rization system obtains at least can reach industrial sulphuric acid sodium II grade standard.
(4) circulating mother liquor that vapo(u)rization system produces can be got back to biochemical device and process, and thoroughly avoids the outer row of circulating mother liquor.
(5) at utmost reduce the discharge of sebacic acid waste water and refuse, the phenol of recovery and sodium sulfate can compensate part process wastewater treatment expense, achieve comprehensive treating process and the resource utilization of waste water.
Embodiment
Below in conjunction with specific embodiment, content of the present invention is described, so that those skilled in the art understand further to the present invention.
Embodiment 1, a kind of integrated conduct method of sebacic acid factory effluent, described sebacic acid waste water processes in interior system through extraction plant, biochemical device, advanced treatment apparatus and evaporative desalination device successively, and wherein, the circulating mother liquor that evaporative desalination device produces is got back to biochemical device and processed.
Embodiment 2, in the method described in embodiment 1: extraction plant is using ricinolic acid, sec-octyl alcohol, QH complexing extractant, ethylene dichloride or other Examples of non-aqueous solvents as extraction agent.
Embodiment 3, in the method described in embodiment 1 or 2: the technique that biochemical device is taked is " acidication+aerobic " technique, processes water after extraction, degradation of organic substances and sulfide oxidation.
Embodiment 4, in embodiment 1 or the method described in 2 or 3: its processing parameter is respectively: acidication: HRT=8 ~ 48h, MLSS=4000 ~ 20000mg/L, F/M=0.1 ~ 0.4; Aerobic: HRT=12 ~ 72h, MLSS=2000 ~ 5000mg/L, dissolved oxygen 2.0 ~ 4.0mg/L, F/M=0.2 ~ 1.0.
Embodiment 5, in the method for embodiment 1-4 described in any one: advanced treatment apparatus comprises flocculation plant and filtration unit, makes bio-chemical effluent after treatment, colloid wherein and concentration of suspension < 1mg/L.
Embodiment 6, in the method for embodiment 1-5 described in any one: evaporative desalination device is MVR, the evaporation condensed water direct reuse obtained.
Embodiment 7, a kind of integrated conduct method experiment of sebacic acid factory effluent:
Hebei sebacic acid manufacturing enterprise, sebacic acid factory effluent COD is 12000 ~ 15000mg/L, and phenol content is 3000 ~ 4000mg/L, and sodium sulphate content is 6 ~ 10%.
Adopt the inventive method to carry out pilot scale process test to above-mentioned waste water, the process water yield is 1 ~ 2m
3/ d.
(1) ricinolic acid is adopted to carry out multi-stage solvent extraction except phenol to waste water, phenol reuse.After extraction, water COD is 3500 ~ 4200mg/L, and phenol content is 50 ~ 150mg/L, pH is 5.0 ~ 6.0.
(2) after extraction, water enters the equalizing tank of biochemical device, adopts " acidication+aerobic " art breading.Hydrolysis acidification pool useful volume 1.5 m
3, retention time of sewage 18 ~ 36h, sludge concentration 10000 ~ 20000mg/L, sludge loading 0.1 ~ 0.4 kgCOD/ (kgMLSSd); Aerobic Pond adopts conventional activated sludge process useful volume 3m
3, retention time of sewage 36 ~ 72h, sludge concentration 2000 ~ 4000mg/L, sludge loading 0.4 ~ 0.6kgCOD/ (kgMLSSd), dissolved oxygen 2.0 ~ 4.0mg/L.Through the Start-up and Adjustment of 3 months, bio-chemical effluent COD < 200mg/L, SS < 50mg/L, phenol < 0.5mg/L.
(3) bio-chemical effluent adds polymerization ferrous sulfate and PAM carries out flocculation treatment, and it is 8.0 ~ 9.0 that pH controls.Flocculation water outlet COD < 120mg/L, SS < 10mg/L
(4) water outlet of flocculating carries out activated carbon filtration and multi-medium filtering, water outlet COD < 100mg/L, SS < 1mg/L successively.
(5) filter water outlet and carry out multiple-effect evaporation, complete evaporate to dryness, in gained solid salt, the index such as sodium sulfate > 98%, moisture, iron magnesium, calcium, chlorine, whiteness all meets the II grade of acceptable end product requirement of industrial sulphuric acid sodium; Gained evaporation condensed water COD < 30mg/L.
Embodiment 8, a kind of integrated conduct method experiment of sebacic acid factory effluent:
Hebei sebacic acid manufacturing enterprise, sebacic acid factory effluent COD is 12000 ~ 15000mg/L, and phenol content is 3000 ~ 4000mg/L, and sodium sulphate content is 6 ~ 10%.
Adopt the inventive method to carry out pilot scale process test to above-mentioned waste water, the process water yield is 1 ~ 2m
3/ d.
(1) QH-1 type extraction agent is adopted to carry out one-level extraction to waste water and two-stage is stripped except phenol, phenol reuse.After extraction, water COD is 1000 ~ 1200mg/L, and phenol content is 30 ~ 50mg/L, pH is 5.0 ~ 6.0.
(2) after extraction, water enters the equalizing tank of biochemical device, adopts " acidication+aerobic " art breading.Hydrolysis acidification pool useful volume 1 m
3, retention time of sewage 12 ~ 24h, sludge concentration 10000 ~ 20000mg/L, sludge loading 0.1 ~ 0.4 kgCOD/ (kgMLSSd); Aerobic Pond adopts conventional activated sludge process useful volume 1m
3, retention time of sewage 8 ~ 20h, sludge concentration 3000 ~ 4000mg/L, sludge loading 0.3 ~ 0.5kgCOD/ (kgMLSSd), dissolved oxygen 2.0 ~ 4.0mg/L.Through the Start-up and Adjustment steady running of 2 months, bio-chemical effluent COD < 150mg/L, SS < 20mg/L, phenol < 0.5mg/L.
(3) bio-chemical effluent adds polymerization ferrous sulfate and PAM carries out flocculation treatment, and it is 8.0 ~ 9.0 that pH controls.Flocculation water outlet COD < 120mg/L, SS < 10mg/L
(4) water outlet of flocculating carries out activated carbon filtration and multi-medium filtering, water outlet COD < 100mg/L, SS < 1mg/L successively
(5) filter water outlet and carry out multiple-effect evaporation, complete evaporate to dryness, in gained solid salt, the index such as sodium sulfate > 98%, whiteness all meets the II grade of acceptable end product requirement of industrial sulphuric acid sodium; Gained evaporation condensed water COD < 30mg/L.
Claims (6)
1. the integrated conduct method of a sebacic acid factory effluent, it is characterized in that: described sebacic acid waste water processes in interior system through extraction plant, biochemical device, advanced treatment apparatus and evaporative desalination device successively, wherein, the circulating mother liquor that evaporative desalination device produces is got back to biochemical device and is processed.
2. method according to claim 1, is characterized in that: extraction plant is using ricinolic acid, sec-octyl alcohol, QH complexing extractant, ethylene dichloride or other Examples of non-aqueous solvents as extraction agent.
3. method according to claim 1, is characterized in that: the technique that biochemical device is taked is " acidication+aerobic " technique, processes, degradation of organic substances and sulfide oxidation to water after extraction.
4. method according to claim 3, is characterized in that: its processing parameter is respectively: acidication: HRT=8 ~ 48h, MLSS=4000 ~ 20000mg/L, F/M=0.1 ~ 0.4; Aerobic: HRT=12 ~ 72h, MLSS=2000 ~ 5000mg/L, dissolved oxygen 2.0 ~ 4.0mg/L, F/M=0.2 ~ 1.0.
5. method according to claim 1, is characterized in that: advanced treatment apparatus comprises flocculation plant and filtration unit, makes bio-chemical effluent after treatment, colloid wherein and concentration of suspension < 1mg/L.
6. method according to claim 1, is characterized in that: evaporative desalination device is MVR, the evaporation condensed water direct reuse obtained.
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| CN109354261A (en) * | 2018-12-10 | 2019-02-19 | 浙江普洛家园药业有限公司 | A kind for the treatment of process of D-pHPG compound probability waste water |
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| JP2007007573A (en) * | 2005-06-30 | 2007-01-18 | Toyota Motor Corp | Apparatus for and method of recycling coolant |
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