CN103214056A - Method for reverse osmosis concentrated water by adsorption-regeneration circular treatment - Google Patents
Method for reverse osmosis concentrated water by adsorption-regeneration circular treatment Download PDFInfo
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- CN103214056A CN103214056A CN2013101526024A CN201310152602A CN103214056A CN 103214056 A CN103214056 A CN 103214056A CN 2013101526024 A CN2013101526024 A CN 2013101526024A CN 201310152602 A CN201310152602 A CN 201310152602A CN 103214056 A CN103214056 A CN 103214056A
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Abstract
The invention discloses a method for reverse osmosis concentrated water by adsorption-regeneration circular treatment, belonging to the field of advanced wastewater treatment. An adsorption-regeneration combination treatment process is adopted, the advanced treatment problem of reverse osmosis concentrated water is solved, the COD (Chemical Oxygen Demand) of inlet water is 150-300mg/L, the COD of the outlet water is less than or equal to 50mg/L after treatment. According to the combination process, adsorption treatment is adopted as the main, an electrochemistry regeneration manner is adopted to recover the adsorption capacity on a saturation adsorption material, the adsorption-regeneration combination treatment process is realized, and the treatment cost of the reverse osmosis concentrated water is greatly reduced.
Description
Technical field
The invention belongs to the advanced treatment of wastewater field, be a kind of method of adsorption-regeneration circular treatment reverse osmosis concentrated water, particularly a kind of solvability organic pollutant about the remnants that remove reverse osmosis concentrated end water is the treatment process of target with the qualified discharge.
Background technology
The at present effective sewage recycling technology of membrane separation technique conduct is just becoming the inevitable choice of sustainable utilization of water resource, is widely used in industrial sewage processing and reuse.Reverse osmosis process be used for waste water advanced processing again the dialysis water that produces about 70-75% of the actual moving process of reuse can satisfy the production reuse, and the reverse osmosis concentrated water about generation 25-30%, contain difficult biochemical organic pollutant and the salinity that are trapped in a large number in this dense water, COD wherein mostly about 150-300 mg/L, can not reach discharging standards.Effective processing of the dense water of film is to restrict one of main problem that membrane separation technique develops rapidly.
At present, the method for disposal commonly used for reverse osmosis concentrated water has: 1. be back in the former water, enter Sewage treatment systems once more; 2. mix the back discharging with the direct discharging of dense water or with other water or waste water; 3. evaporate, recycle behind the water vapor condensation of evaporation, the solid slag discharging is collected.Dense water returns and drains into the Sewage treatment systems front end; pollutent can be in system circulative accumulation; cause the reduction and the deterioration of system processing power the most at last; and dense water is in line or the discharging of dilution back; can cause serious secondary pollution maybe can increase the quantity discharged of factory effluent, not meet national environment protection, water-saving policy.The dense water evaporation drying of RO is handled, had the high problem of energy consumption and working cost.The present present situation still lower to effective degree of treatment of the dense water of RO presses for that exploitation is a kind of can effectively remove remaining organic pollutant in the dense water, and efficiently, Technology is extremely urgent economically and reasonably.
By adsorption-regeneration circular treatment technology, can well solve removing and degradation problem of Persistent organic pollutants in the dense water of RO,, can realize that sorbent material repeatedly recycles owing to solved the regeneration difficult problem of sorbent material, improve the work-ing life of sorbent material, thereby reduced processing cost.This technology has the separation efficiency height, and the characteristics that cost is low have very big market outlook.
Summary of the invention
At the deficiencies in the prior art, the invention provides a kind of treatment process of reverse osmosis concentrated water, adsorption separation technology is combined with the electrochemical degradation technology, to reach the purpose of efficient, environmental protection, the energy-conservation dense water of processing RO.
The present invention is a kind of method of adsorption-regeneration circular treatment reverse osmosis concentrated water, it is characterized in that,
This method comprises the absorption and two systems of regenerating; Adsorption system is by the former water storage tank of reverse osmosis concentrated water, lift pump and can realize more than two that the adsorption tower group of parallel running constitutes; Regeneration system rapidly applies DC electric field, regenerated liquid lift pump and regenerated liquid storage tank by preembedded anodic-cathodic in the adsorption tower group and forms;
Described adsorption system tower group, sorbent material are one or more medium sorbing materials in gac, modified coal ash, the activated carbon fiber;
Adsorption system tower group can alternately be adsorbed-manipulation of regeneration reverse osmosis concentrated water, and concrete operation scheme is:
Go out operation scheme on advancing under the COD of water inlet reverse osmosis concentrated water is 150-300 mg/L, adopts, the absorption residence time is 10-60 min, can control water outlet COD≤50 mg/L;
As water outlet COD＞50mg/L, this adsorption tower group state is switched to reproduced state by adsorbed state, earlier raffinate in the tower is emptied in the former water storage tank of reverse osmosis concentrated water, inject electrolytic solution then, apply DC electric field on the anodic-cathodic that preembedded in the adsorption tower is discharged at interval, voltage is 2-55 V, electric current is 2-20 A, and HRT is 0.5-6h, and regenerated liquid is disposed to the regenerated liquid storage tank, to recycle, so far this adsorption tower group is finished the electrochemical regeneration process and is entered next circular treatment holding state.
The adsorption-regeneration circulating disposal process is a kind of both economical reverse osmosis concentrated water evolution technology, organic pollutant in the dense water of RO is based on deliquescent small organic molecule, the contaminant molecule amount based on tens to hundreds of dalton, and adsorption technology energy active adsorption small organic molecule, realize removing the purpose of the dense water organic pollutant of RO, saturated sorbing material adopts electrochemical principle to carry out degrading behind in-situ electrolysis and the desorption again, saturated sorbent material is regenerated, be beneficial to the adsorption treatment reverse osmosis concentrated water and the electrochemical regeneration process of next round.
Characteristics of the present invention and beneficial effect are:
(1) one or more medium adsorbents adsorb in gac, modified coal ash, the activated carbon fiber is handled reverse osmosis concentrated water, can realize complicated organic pollutant adsorption enrichment in the dense water of RO, the technology coupling system of absorption-electrochemical regeneration, has the advantage efficient, that investment is little, working cost is low, simple to operation, can realize automatization control, be a kind of very practical dense method for purifying water of RO.
(2) absorption system can have more absorption and the regenerated cycle carry out reasonable disposition, the adsorption tower group that can realize parallel running more than two groups is set, saturated adsorption tower carries out regenerated simultaneously, and the adsorption tower of standby switches to the absorption running status, can realize the continuous processing of the dense water of RO.
(3) sorbent material can be realized in-situ regeneration, can save human cost greatly.
(4) electrolytic solution can be recycled in the inventive method treating processes, and no mud and other secondary refuse produce, and are a kind of dense water technologies of RO of cleaning, have a extensive future obvious environment benefit.
Embodiment
Embodiment 1:
The dense water of RO to oil refining industry carries out art breading.Sorbent material in the adsorption tower adopts gac, and its performance perameter sees Table 1:
The performance perameter of table 1 gac
Change of water quality before and after the dense water treatment of table 2 RO
With the gac is the dense water of RO of sorbent treatment oil refining industry, and operational conditions is that HRT is 20 min, but the dense water of RO of period 1 stabilizing treatment 43 BV, and water outlet COD is 37 mg/L, satisfies the discharge index of COD≤50mg/L.The saturated activity charcoal adopts electrochemical method to regenerate, voltage 19 V, and electric current 2.53-3.17A, HRT are 6 h, through 10 all after dates of adsorption-regeneration, its regeneration efficiency is more than 88.4%.Experimental result shows that after charcoal absorption-electrochemical regeneration art breading, COD, DOC and wet goods index in the dense water of RO all can obtain effective elimination, and the saturated activity charcoal adopts electrochemical means to regenerate, and effect is more stable.
Embodiment 2:
The dense water of RO to petrochemical industry carries out art breading.Sorbent material in the adsorption tower adopts modified coal ash, and its performance perameter sees Table 3:
The performance perameter of table 3 modified coal ash
Change of water quality before and after the dense water treatment of table 4 RO
With the modified coal ash is the dense water of RO of sorbent treatment petrochemical industry, and operational conditions is that HRT is 60 min, but the dense water of RO of period 1 stabilizing treatment 23 BV, and water outlet COD is 48 mg/L, satisfies the discharge index of COD≤50 mg/L.Electrochemical method regeneration is adopted in saturated modified coal ash regeneration, voltage 38 V, and electric current 5.53-6.21 A, HRT are 2 h, through 10 all after dates of adsorption-regeneration, its regeneration efficiency is more than 73.9%.Experimental result shows that after modified coal ash absorption-electrochemical regeneration art breading, COD, DOC and wet goods index removal effect in the dense water of RO are obvious, and it is more stable that saturated modified coal ash employing electrochemical means is carried out regeneration effect.
Embodiment 3:
The dense water of RO to steel industry carries out art breading.Sorbent material in the adsorption tower adopts the activated carbon fiber felt, and the change of water quality before and after handling sees Table 5:
Change of water quality before and after the dense water treatment of table 5 RO
With the activated carbon fiber is the dense water of RO of sorbent treatment steel industry, and operational conditions is that HRT is 30 min, but the dense water of RO of period 1 stabilizing treatment 58 BV, and water outlet COD is 37 mg/L, satisfies the discharge index of COD≤50 mg/L.Saturated back adopts electrochemical method to regenerate, voltage 45 V, and electric current 8. 21-9. 51 A, HRT is 0.5 h, through 12 all after dates of adsorption-regeneration, still can processing 52 BV up to standard, regeneration efficiency is stabilized in more than 89.7%.Experimental result shows that after carbon fiber adsorption and catalytic combustion-electrochemical regeneration art breading, the indexs such as COD, oil and DOC in the dense water of RO all can obviously be removed.
Claims (1)
1. the method for an adsorption-regeneration circular treatment reverse osmosis concentrated water is characterized in that:
This method comprises the absorption and two systems of regenerating; Adsorption system is by the former water storage tank of reverse osmosis concentrated water, lift pump and can realize more than two that the adsorption tower group of parallel running constitutes; Regeneration system rapidly applies DC electric field, regenerated liquid lift pump and regenerated liquid storage tank by preembedded anodic-cathodic in the adsorption tower group and forms;
Described adsorption system tower group, sorbent material are one or more medium sorbing materials in gac, modified coal ash, the activated carbon fiber;
Adsorption system tower group can alternately be adsorbed-manipulation of regeneration reverse osmosis concentrated water, and concrete operation scheme is:
Go out operation scheme on advancing under the COD of water inlet reverse osmosis concentrated water is 150-300 mg/L, adopts, the absorption residence time is 10-60 min, can control water outlet COD≤50 mg/L;
As water outlet COD＞50mg/L, this adsorption tower group state is switched to reproduced state by adsorbed state, earlier raffinate in the tower is emptied in the former water storage tank of reverse osmosis concentrated water, inject electrolytic solution then, apply DC electric field on the anodic-cathodic that preembedded in the adsorption tower is discharged at interval, voltage is 2-55 V, electric current is 2-20 A, and HRT is 0.5-6h, and regenerated liquid is disposed to the regenerated liquid storage tank, to recycle, so far this adsorption tower group is finished the electrochemical regeneration process and is entered next circular treatment holding state.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104944638A (en) * | 2015-06-10 | 2015-09-30 | 上海化学工业区中法水务发展有限公司 | Treatment method for high-salinity and low-pollution industrial wastewater |
| CN107265549A (en) * | 2017-07-05 | 2017-10-20 | 北京中科康仑环境科技研究院有限公司 | A kind of reverse osmosis concentrated water organic matter removal devices and methods therefor |
| CN109110860A (en) * | 2018-09-11 | 2019-01-01 | 中国科学院青海盐湖研究所 | A method of by dividing intercept form adsorbent equipment to extract lithium |
| CN114436429A (en) * | 2021-12-17 | 2022-05-06 | 广东建科创新技术研究院有限公司 | Adsorption and catalytic oxidation process for organic pollutants in water body |
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2013
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104944638A (en) * | 2015-06-10 | 2015-09-30 | 上海化学工业区中法水务发展有限公司 | Treatment method for high-salinity and low-pollution industrial wastewater |
| CN107265549A (en) * | 2017-07-05 | 2017-10-20 | 北京中科康仑环境科技研究院有限公司 | A kind of reverse osmosis concentrated water organic matter removal devices and methods therefor |
| CN109110860A (en) * | 2018-09-11 | 2019-01-01 | 中国科学院青海盐湖研究所 | A method of by dividing intercept form adsorbent equipment to extract lithium |
| CN114436429A (en) * | 2021-12-17 | 2022-05-06 | 广东建科创新技术研究院有限公司 | Adsorption and catalytic oxidation process for organic pollutants in water body |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: CNOOC TIANJIN CHEMICAL RESEARCH & DESIGN INSTITUTE CO., LTD. Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: CNOOC Tianjin Chemical Research & Design Institute Patentee before: China National Offshore Oil Corporation |