CN102951698A - Method for treating PX (para-xylene) wastewater by using active carbon as adsorbent - Google Patents
Method for treating PX (para-xylene) wastewater by using active carbon as adsorbent Download PDFInfo
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- CN102951698A CN102951698A CN2012105491439A CN201210549143A CN102951698A CN 102951698 A CN102951698 A CN 102951698A CN 2012105491439 A CN2012105491439 A CN 2012105491439A CN 201210549143 A CN201210549143 A CN 201210549143A CN 102951698 A CN102951698 A CN 102951698A
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Abstract
The invention discloses a method for treating PX (para-xylene) wastewater by using active carbon as an adsorbent. According to the method, the washed and dried active carbon is used as the adsorbent, the wastewater is injected into a container with a certain amount of adsorbent for adsorption, and para-xylene in the wastewater is removed. An adsorption treatment process adopted by the invention comprises intermittent adsorption and fixed bed adsorption. After the wastewater is adsorbed through a certain amount of active carbon, the effluent can reach the standard to be discharged. The method has the obvious advantages of stable and reliable process, simple treatment device, low cost, good adsorption treatment effect and the like. The active carbon adsorbent used by the invention has the characteristics of low price, wide source, simple preparation process, high efficiency, wide applicability, no secondary pollution and the like.
Description
Technical field
The invention belongs to field of waste water treatment, be specifically related to a kind of take the method for gac as sorbent treatment PX waste water.
Background technology
P-Xylol (PX) is important industrial chemicals, can be used as the thinner of pigment, paint etc., the solvent of the industry such as printing, rubber, leather.All can produce a large amount of dimethylbenzene waste water and gas in the production process of the relevant industries such as organic synthesis, synthetic rubber, paint and dyestuff, synthon, refining of petroleum, pharmacy, Mierocrystalline cellulose, these dimethylbenzene waste water and waste gas can enter water body with the waste water that it is produced and applying unit is discharged.Produce 1t dimethylbenzene, general waste water 2 m that contain dimethylbenzene 300～1000 mg/L that discharge
3In recent years, the direct discharging of trade effluent has caused the serious organic contamination of water body, although the dimethylbenzene in the environment can biological degradation, biodegradation rate is much lower more than rate of volatilization.Therefore, the discharging of dimethylbenzene waste water not only threatens fish and hydrobiological existence, and human health in serious threat.It is generally acknowledged, concentration is low-concentration organic waste water below 500 mg/L, needs after the purifying treatment discharging or recycles.Organic waste water complicated component, toxicity are large, generally deal with relatively difficulty.P-Xylol is water insoluble at normal temperatures, usually is about 100～170 ppm by PX concentration in the PX waste water of manufacture discharge, belongs to low-concentration organic waste water.PX waste water has unpleasant foul odour, if do not process, will have a strong impact on people and biological living environment.Therefore, seek cost low, simple to operate, effectively process the method for PX waste water, the processing of PX waste water is had very important significance.
At present, the treatment process of organic waste water mainly contains Physical, chemical method, biological treatment and high-level oxidation technology.Chemical method since medicament expense to remove some organic effect with high and chemical coagulation bad; The biological process processing speed is slow, and the required cycle is long; Oxidation technology needs the development of new reactor, could improve the efficient of wastewater treatment, and it is high that this method is processed the waste water cost; Absorption method is wherein a kind ofly to be commonly used to process organic physical method in the waste water, compares with additive method, and this method technique is simple, easy to operate, cost is low, treatment cycle is short, is the method for processing organic wastewater of comparatively commonly using.The sorbent material price decision expense of Handling Waste Water by Absorbing Way.The employed sorbent material of Handling Waste Water by Absorbing Way mostly is gac or macroporous adsorbent resin.Macroporous adsorbent resin is that a class does not contain cation exchange groups and the preparation of macroporous structure is arranged, and is mainly used in environmental protection, food, medicine and other fields, and price is generally high than gac.Gac is to be that main material is made raw material by containing charcoal, the hydrophobic adsorbent that makes through high temperature carbonization and activation.Because gac has flourishing pore structure and huge specific surface area, so organic pollutant to dissolving in the water, has stronger adsorptive power such as benzene-like compounds, phenolic compound, oil and petroleum products etc., and the organic pollutant to being difficult to remove with biological process and other chemical method, such as the organic compound of colourity, foreign odor, methylenum coeruleum surfactant, weedicide, sterilant, agricultural chemicals, synthetic dyestuff, aminated compounds and many synthetic etc. preferably removal effect is arranged.The gac raw material sources are extensive, and preparation is simple, and kind is many, and is large to the Adsorption of Organic capacity; And gac wastewater treatment equipment floor space is little, and operational management is simple.The saturated rear regeneration of charcoal absorption is easy and reusable, does not produce secondary pollution.Therefore, charcoal absorption is the most effective most important treatment technology during sewage disposal and water purify, and can be applicable to the processing of PX waste water.
Summary of the invention
The object of the present invention is to provide that a kind of cost is low, adsorptive capacity is large, non-secondary pollution, operation is simple and feasible take the method for gac as sorbent treatment PX waste water.
To achieve these goals, the technical solution used in the present invention is as follows:
It is a kind of take the method for gac as sorbent treatment PX waste water that the present invention at first provides, and described method is static Batch Adsorption method, carries out according to the following steps:
(1) gac is washed with water method and remove wherein floating matter and dust, drying, for subsequent use;
(2) getting concentration is that the PX waste water of 100～170 ppm is poured reaction tank into;
(3) gac is dropped into reaction tank, utilize agitator in whole pond, to carry out rapid stirring, make gac and PX waste water carry out absorption reaction, the gac addition is 0.0012～0.1 g/g PX waste water, adsorption time is 3～10 h, adsorption temp is 20～60 ℃, and stirring velocity is 100～280 rpm.
It is a kind of take the method for gac as sorbent treatment PX waste water that the present invention also provides, and described method is dynamic continuous adsorption method, is undertaken by following operation:
(1) gac is washed with water method and remove wherein floating matter and dust, drying, for subsequent use;
(2) gac is packed into preventing fixed bed adsorber, then the PX waste water that passes into concentration and be 100～170ppm carries out continuous adsorption, the loadings of charcoal absorption bed is 0.0012～0.1 g/g PX waste water, the PX wastewater flow be controlled at the wastewater flow rate of 10～105 times of charcoal absorption column volumes/hour, treatment temp is 20～55 ℃.
The gac raw material that above two kinds of methods adopt is KC-8, KC-6, coal mass active carbon, cocoanut active charcoal or active fruit shell carbon.The particle diameter of gac is 10 ~ 40 orders.
The present invention directly uses gac as sorbent material, processes PX waste water, and the waste water after the processing can directly discharge.The amount of acticarbon is decided according to the loading capacity of concentration, treatment capacity and the gac of waste water.Adsorbing saturated gac can reuse by the desorption and regeneration recovery.
Remarkable advantage of the present invention is: treatment effect is good, sorbent material wide material sources, cost are low, do not need aftertreatment, applied range etc.Be specially:
(1) treatment effect is good, and activated carbon dosage is few.Acticarbon of the present invention is large to the loading capacity of PX in the waste water, and in the time of 40 ℃, during 100 rpm, KC-8 can reach 235 mg/g to the adsorptive capacity of PX.
(2) sorbent material is cheap, and cost for wastewater treatment is low.In addition, the present invention is less demanding to equipment and adsorption conditions, and technological process is simple, can implement industrialization, has wide market outlook.
(3) gac wide material sources.
(4) do not need subsequent disposal.Charcoal absorption capacity of the present invention is large, and the waste water after the processing can directly discharge or reuse.
(5) applied range.The present invention is fit to contain all waste water of PX.
Description of drawings
Fig. 1 is that embodiment 5 different activities charcoal consumptions are on the impact of PX clearance.
Fig. 2 is the graph of a relation of embodiment 7 exit PX concentration and adsorption time.
Embodiment
Below be several embodiments of the present invention, further specify the present invention, but the present invention is not limited only to this.
Gac pre-treatment: activated carbon granule washing, dry for standby;
Treatment sewage: the PX waste water of concentration 100～170ppm.
Getting concentration is the PX aqueous solution 57 g of 170 ppm, and 30 purpose KC-8 gacs, 0.04 g that weighs up is joined in the Batch Adsorption container that waste water is housed, and the control adsorption temp is 40 ℃, and adsorber vibration rotating speed is 100 rpm.P-Xylol concentration in the aqueous solution is carried out the real time measure, investigate its over time rule.When p-Xylol concentration no longer changes in the aqueous solution, can think that gac has adsorbed saturated.This moment, the adsorptive capacity of gac was 235 mg/g, and residue PX concentration is 13 ppm in the water, and the PX clearance reaches 92.3 % in the water.
Embodiment 2
For comparing adsorption effect, use respectively KC-6 gac and coal mass active carbon to carry out the experiment of embodiment 1, other conditions are constant.When using the KC-6 gac, the adsorptive capacity of gac is 234 mg/g, and residue PX concentration is 16 ppm in the water, and the PX clearance reaches 90.8 % in the water; When using coal mass active carbon, the adsorptive capacity of gac is 204 mg/g, and residue PX concentration is 32 ppm in the water, and the PX clearance reaches 81.2 % in the water.
Embodiment 3
Getting concentration is the PX aqueous solution 57 g of 130 ppm, and 40 purpose KC-8 gacs, 0.04 g that weighs up is joined in the Batch Adsorption container that waste water is housed, and the control adsorption temp is 40 ℃, and adsorber vibration rotating speed is 200 rpm.During adsorption equilibrium, the adsorptive capacity of gac is 180 mg/g, and residue PX concentration is 3 ppm in the water, and the PX clearance reaches 97.7 % in the water.
Embodiment 4
Getting concentration is the PX aqueous solution 57 g of 140 ppm, and 30 purpose KC-8 gacs, 0.04 g that weighs up is joined in the Batch Adsorption container that waste water is housed, and the control adsorption temp is 40 ℃, and adsorber vibration rotating speed is 280 rpm.During adsorption equilibrium, the adsorptive capacity of gac is 190 mg/g, and residue PX concentration is 7 ppm in the water, and the PX clearance reaches 95.2 % in the water.
Embodiment 5
Getting concentration is the PX aqueous solution 57 g of 110 ppm, and 40 purpose KC-8 gacs of the different mass that weighs up are joined in the Batch Adsorption container that waste water is housed, and the control adsorption temp is 50 ℃, and adsorber vibration rotating speed is 250 rpm.During adsorption equilibrium, the adsorptive capacity of different activities charcoal concerns such as Fig. 1 the clearance of PX.When the consumption of gac was 0.04 g, the PX clearance was about 95 % in the water; When consumption was 0.07 g, the PX clearance was near 100 % in the water.
Embodiment 6
Getting concentration is the PX aqueous solution 570 g of 110 ppm, and KC-8 gac 1.0 g that weigh up are joined in the Batch Adsorption container that waste water is housed, and the control adsorption temp is 50 ℃, and adsorber vibration rotating speed is 280 rpm.P-Xylol concentration in the aqueous solution is carried out the real time measure, and during adsorption equilibrium, residue PX concentration is 0 in the water, and namely the PX clearance is 100%.
Embodiment 7
20 purpose gacs are packed into the ADSORPTION IN A FIXED BED post, and (φ 10 * 360mm), and the amounts of activated carbon that adsorption column is filled out is 10.8423g, gets rid of bubble with deionized water rinsing.Through constant-flux pump with concentration be the PX waste water of 170ppm with the flow of 35ml/min by active carbon bed, the adsorption column insulation is 45 ℃.At set intervals, measure PX concentration in the exit.The graph of a relation of exit PX concentration and adsorption time as shown in Figure 2.As can be seen from Fig., time of break-through (take exit concentration as starting point concentration 5%) is about 190min, and treatment capacity is 6.8L.
Embodiment 8
40 purpose gacs are packed into the ADSORPTION IN A FIXED BED post, and (φ 10 * 360mm), and the amounts of activated carbon that adsorption column is filled out is 10.2583g, gets rid of bubble with deionized water rinsing.Through constant-flux pump with concentration be the PX waste water of 170ppm with the flow of 42ml/min by active carbon bed, the adsorption column insulation is 55 ℃.Can get equally, time of break-through is about 200min, and treatment capacity is 8.4L.
Embodiment 9
10 purpose gacs are packed into the ADSORPTION IN A FIXED BED post, and (φ 10 * 360mm), and the amounts of activated carbon that adsorption column is filled out is 10.5210g, gets rid of bubble with deionized water rinsing.Through constant-flux pump with concentration be the PX waste water of 170ppm with the flow of 50ml/min by active carbon bed, the adsorption column insulation is 45 ℃.Can get equally, time of break-through is about 130min, and treatment capacity is 6.6L.
Claims (4)
1. one kind take the method for gac as sorbent treatment PX waste water, and it is characterized in that: described method is static Batch Adsorption method, carries out according to the following steps:
(1) gac is adopted method for washing remove wherein floating matter and dust, drying, for subsequent use;
(2) getting concentration is that the PX waste water of 100～170 ppm is poured reaction tank into;
(3) gac is dropped into reaction tank, utilize agitator in whole pond, to carry out rapid stirring, make gac and PX waste water carry out absorption reaction, the gac addition is 0.0012～0.1 g/g PX waste water, adsorption time is 3～10 h, adsorption temp is 20～60 ℃, and stirring velocity is 100～280 rpm.
2. one kind take the method for gac as sorbent treatment PX waste water, and it is characterized in that: described method is dynamic continuous adsorption method, is undertaken by following operation:
(1) gac is adopted method for washing remove wherein floating matter and dust, drying, for subsequent use;
(2) gac is packed into preventing fixed bed adsorber, then the PX waste water that passes into concentration and be 100～170ppm carries out continuous adsorption, the gac loadings is 0.0012～0.1 g/g PX waste water, the PX wastewater flow be controlled at the wastewater flow rate of 10～105 times of charcoal absorption column volumes/hour, treatment temp is 20～55 ℃.
3. according to claim 1 and 2 take the method for gac as sorbent treatment PX waste water, it is characterized in that: the gac raw material of employing is KC-8, KC-6, coal mass active carbon, cocoanut active charcoal or active fruit shell carbon.
4. according to claim 1 and 2 take the method for gac as sorbent treatment PX waste water, it is characterized in that: the particle diameter of the gac that adopts is 10 ~ 40 orders.
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| CN2012105491439A CN102951698A (en) | 2012-12-18 | 2012-12-18 | Method for treating PX (para-xylene) wastewater by using active carbon as adsorbent |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103877934A (en) * | 2014-03-26 | 2014-06-25 | 西北师范大学 | Method for preparing porous carbon material from bean dregs and application of porous carbon material serving as adsorbent in wastewater treatment |
| CN110961087A (en) * | 2019-11-26 | 2020-04-07 | 浙江海洋大学 | PX adsorbent and preparation method thereof |
| CN113511770A (en) * | 2021-09-13 | 2021-10-19 | 江苏飞亚化学工业集团股份有限公司 | Sewage treatment system in xylene course of working |
-
2012
- 2012-12-18 CN CN2012105491439A patent/CN102951698A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| 陈良杰等: "挥发性有机物的物化性质与活性炭饱和吸附量的相关性研究 ", 《化工环保》 * |
| 陈良杰等: "挥发性有机物的物化性质与活性炭饱和吸附量的相关性研究", 《化工环保》, vol. 27, no. 05, 15 October 2007 (2007-10-15), pages 409 - 412 * |
| 高宇翔: "对二甲苯在活性炭固定床上的吸附动力学", 《广东化工》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103877934A (en) * | 2014-03-26 | 2014-06-25 | 西北师范大学 | Method for preparing porous carbon material from bean dregs and application of porous carbon material serving as adsorbent in wastewater treatment |
| CN110961087A (en) * | 2019-11-26 | 2020-04-07 | 浙江海洋大学 | PX adsorbent and preparation method thereof |
| CN113511770A (en) * | 2021-09-13 | 2021-10-19 | 江苏飞亚化学工业集团股份有限公司 | Sewage treatment system in xylene course of working |
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Application publication date: 20130306 |