CN106630415A - Waste paper pulp papermaking wastewater treatment process - Google Patents
Waste paper pulp papermaking wastewater treatment process Download PDFInfo
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- CN106630415A CN106630415A CN201611174901.8A CN201611174901A CN106630415A CN 106630415 A CN106630415 A CN 106630415A CN 201611174901 A CN201611174901 A CN 201611174901A CN 106630415 A CN106630415 A CN 106630415A
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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
- 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
- C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/046—Recirculation with an external loop
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a waste paper pulp papermaking wastewater treatment process which comprises the following steps: adjusting the pH of the biochemically treated waste paper pulp papermaking wastewater to 3-5 and then performing Fenton reaction; adjusting the pH of the effluent water after Fenton reaction to pH 6.5-8 to obtain the adjusted effluent water; returning 30-150% of the adjusted effluent water to a biochemical tank for secondary biochemical treatment; adding the rest of the adjusted effluent water to a coagulation sedimentation tank for coagulation sedimentation. The waste paper pulp papermaking wastewater treatment process provided by the invention is simple in process step and strong in operability, greatly reduces the treatment cost as compared with the prior art, and can effectively reduce the COD.
Description
Technical field
The invention belongs to technical field of waste water processing, and in particular to a kind of handling process of secondary stock paper waste.
Background technology
Paper waste has pollutant kind many, and content of organics is high, the features such as discharge capacity is big.Making with waste paper as raw material
Paper waste of the water quality of paper waste water relative to tradition with string as raw material has the characteristic of oneself, and it is mainly characterized by：It is useless
The load weight of water, discharge capacity is big, and the purification of impurity, slagging-off, concentration, deinking were waited in dissociation, the screening of raw material, waste paper
The wastewater flow rate discharged in journey is big；Wastewater Pollutant concentration is high, and complicated component is changeable, and substantial amounts ofization can be added during deinking etc.
Learn reagent so that not only containing organic matters such as lignin in waste water, can also be containing chemical agent, organic chloride, volatile phenol etc.
Chemical substance, it is not disposable；Containing chemical addition agent, chemical addition agent is the main source of poisonous and harmful substance, poisonous to biology
Property or inhibitory action, but it is essential in process of production；The colourity of waste water is big, smell weight, and suspension content is high.
There is common method in pulping wastewater treatment engineering：Physical, chemical method, physico-chemical process, biochemical process etc..Physical can be with
Solid suspension, colloidal type material and partial solubility organic matter in removal waste water, mainly there is coagulation, precipitation, air supporting, filtration
It is the requisite method in pulping wastewater treatment etc. method.Chemical method has mainly for dissolubility difficult degradation in waste water
Machine thing and other chemical substances, make using chemical reagent or under other specific conditions pollutant decompose reach degradation of contaminant or
Change the purpose of water quality (as improved biodegradability), such as Fenton oxidation, ozone oxidation, photochemical catalytic oxidation, electronation and super
The methods such as critical oxidation.Physico-chemical process mainly has absorption method, extraction, neutralisation, membrane separation process, ion-exchange etc., mainly
Effect is to reduce the indices such as waste water, colourity.Biochemical process is mainly using the effect such as microorganism adsorption, absorption, decomposition
Remove deliquescent organic pollution in eliminating water.
Fenton methods have its unique advantage because of its superpower oxidisability when secondary stock paper waste is processed.Fenton
Effect of the reagent in water process mainly includes two kinds of effects of the oxidation to organic matter and coagulation, in terms of paper waste is processed,
It is mainly used in the secondary treatment yielding water of paper waste.Secondary stock paper waste is processed with Fenton methods, dioxygen water consumption exists
During 60mg/L, ferrous sulfate consumption can reach 80% to 90% in 400mg/L, COD clearances, and the problem for existing is that medicament disappears
Consumption is too high, and cost is difficult to control to, it is difficult to deal with large-scale industrial production.In the last few years, Fenton methods occurred in that many
Improved method, such as light electrolysis-Fenton methods, light-Fenton methods, electricity-Fenton methods etc..Current high cost and COD clearances
Low problem is still urgently to be resolved hurrily.
The content of the invention
For this purpose, present invention aims to be directed to the problem of prior art presence, there is provided a kind of secondary stock pulping wastewater treatment work
Skill.
For achieving the above object, secondary stock paper-making effluent treating process of the invention comprises the steps：
The pH for passing through the secondary stock paper waste of biochemical treatment is adjusted to 3-5 carries out Fenton reactions；
The reacted water outlets of Fenton are adjusted into pH to 6.5-8, adjusted water outlet；
Being back to biochemistry pool by the 30% to 150% of the adjusting water outlet carries out secondary biochemistry, and remaining adjusting water outlet is entered
Coagulative precipitation tank carries out coagulating sedimentation.
Alternatively, treatment in accordance with the present invention technique, in Fenton reactions, on the basis of 1L secondary stock paper wastes, mistake
The usage amount of hydrogen oxide is 0.1mL-15mL, and the usage amount of ferrous sulfate is 0.1g-20g.
Alternatively, treatment in accordance with the present invention technique, in Fenton reactions, on the basis of 1L secondary stock paper wastes, mistake
The usage amount of hydrogen oxide is 0.15mL, and the usage amount of ferrous sulfate is 1g.
Alternatively, treatment in accordance with the present invention technique, the reaction time of the Fenton reactions is 10-120 minutes.
Alternatively, treatment in accordance with the present invention technique, the reaction time of the Fenton reactions is 40 minutes.
Alternatively, treatment in accordance with the present invention technique, the 50% to 100% of the adjusting water outlet is back to biochemistry pool is carried out
Secondary biochemistry.
Alternatively, treatment in accordance with the present invention technique, the time of coagulating sedimentation is 20-60 minutes, in coagulative precipitation tank
One or more in addition bodied ferric sulfate, polyacrylamide and aluminium polychloride is used as coagulant.
Alternatively, treatment in accordance with the present invention technique, the time of coagulating sedimentation is 40 minutes.
Alternatively, treatment in accordance with the present invention technique, on the basis of adjusting waste water by 1L, the dosage of coagulant is 1mg-
20mg。
Alternatively, treatment in accordance with the present invention technique, on the basis of adjusting waste water by 1L, the dosage of coagulant is 5mg.
The secondary stock paper-making effluent treating process step of the present invention is simple, and workable, processing cost is compared with prior art
10% or so can be reduced, and can effectively reduce COD.
Description of the drawings
By the detailed description for reading hereafter preferred embodiment, various other advantages and benefit is common for this area
Technical staff will be clear from understanding.Accompanying drawing is only used for illustrating the purpose of preferred embodiment, and is not considered as to the present invention
Restriction.In the accompanying drawings：
Fig. 1 is the schematic flow sheet of the new advanced treatment process of paper-making effluent of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the invention will be further described with specific embodiment.
The present invention proposes a kind of secondary stock paper-making effluent treating process, and the handling process can improve COD clearances, reduces
The processing cost of secondary stock paper waste is so as to being conducive to the application of industrial mass production.
If not specializing, chemical reagent used is conventional commercial reagent in embodiment, skill used in embodiment
The conventional meanses that art means are well known to those skilled in the art.
Water quality monitoring standard is performed with reference to national standard in example.
Fig. 1 shows the schematic flow sheet of secondary stock paper-making effluent treating process of the present invention.As shown in figure 1, science and engineering at this
Skill comprises the steps：
The pH for passing through the secondary stock paper waste of biochemical treatment is adjusted to 3-5 carries out Fenton reactions.Typically
Ground, after completing biochemical treatment, the waste water after process is delivered in sedimentation basin and is precipitated, then will be settled out water outlet deliver to it is pre- anti-
Ying Chizhong, adds sulphur acid for adjusting pH to reach required value.Then the waste water after acidifying is delivered in Fenton reaction tanks is carried out
Fenton reacts.Preferably, the pH for passing through the secondary stock paper waste of biochemical treatment is adjusted to 3.5-4.5.
Hydrogen peroxide and ferrous sulfate are added with Fenton reaction tanks.Specifically, it is with 1L secondary stock paper wastes
Benchmark, the usage amount of hydrogen peroxide is 0.1mL-15mL, and the usage amount of ferrous sulfate is 0.1g-20g.It is further preferred that with
On the basis of 1L secondary stock paper wastes, the usage amount of hydrogen peroxide is 0.15mL, and the usage amount of ferrous sulfate is 1g.It is described
The reaction time of Fenton reactions is preferably 10-120 minutes, more preferably 40 minutes.
After completing Fenton reactions, reacted water outlet is entered in neutralization pond, add the basic species such as NaOH
Matter adjusts pH to 6.5-8, adjusted water outlet.Preferably, the pH of reacted water outlet is adjusted to 7.2-7.6.
Finally, being back to biochemistry pool by the 30% to 150% of the adjusting water outlet carries out secondary biochemistry, remaining adjusting water outlet
Coagulating sedimentation is carried out into coagulative precipitation tank.Preferably, the 50% to 100% of the adjusting water outlet is back to biochemistry pool and carries out two
Secondary biochemistry.
In the coagulating sedimentation, time of coagulating sedimentation is 20-60 minutes, preferably 40 minutes.In coagulative precipitation tank
One or more in middle addition bodied ferric sulfate, polyacrylamide and aluminium polychloride is used as coagulant.Specifically, with 1L tune
On the basis of section waste water, the dosage of coagulant is 1mg-20mg, preferably 5mg.
In order to specifically describe the present invention, applicant is illustrative with following specific embodiments.It should be understood that
It is that following specific embodiments are not constituted to model of the present invention only as the exemplary illustration of specific implementation of the invention
The restriction enclosed.
If not specializing, chemical reagent used is conventional commercial reagent in embodiment, skill used in embodiment
The conventional meanses that art means are well known to those skilled in the art.
Embodiment 1
The COD of secondary stock paper waste is 3303.69mg/L.
Above-mentioned waste water is processed in the steps below：
(1) secondary stock paper waste enters sedimentation basin after biochemistry pool process, then by sedimentation basin water outlet in pre-reaction
Sulphur acid for adjusting pH value is added to be 3.5 to 4.5 in pond；
(2) waste water after being acidified carries out Fenton reactions into Fenton reaction tanks, wherein adding hydrogen peroxide and sulphur
It is sour ferrous.The hydrogen peroxide of 0.15mL and the ferrous sulfate of 1g, reaction time 40min are added in wherein per 1L waste water.
(3) Fenton reaction water outlets are entered in neutralization pond, it is 7.2 to 7.6 to add NaOH to adjust pH value；
(4) 50% of the wastewater effluent after neutralization is back in biochemistry pool；
(5) waste water for being not engaged in flowing back after neutralizing is entered into coagulating basin, adds bodied ferric sulfate to carry out coagulating sedimentation,
React for 40min.Wherein, the bodied ferric sulfate of 5mg is added in every 1L waste water.
The water outlet for taking coagulating sedimentation is detected that COD is 68.27mg/L.
It is computed, COD clearances are up to 97.93%.
Embodiment 2
The COD of secondary stock paper waste is 3303.69mg/L.
Above-mentioned waste water is processed in the steps below：
(1) secondary stock paper waste enters sedimentation basin after biochemistry pool process, then by sedimentation basin water outlet in pre-reaction
Sulphur acid for adjusting pH value is added to be 3.5 to 4.5 in pond；
(2) waste water after being acidified carries out Fenton reactions into Fenton reaction tanks, wherein adding hydrogen peroxide and sulphur
It is sour ferrous.The hydrogen peroxide of 0.3mL and the ferrous sulfate of 2g, reaction time 40min are added in wherein per 1L waste water.
(3) Fenton reaction water outlets are entered in neutralization pond, it is 7.2 to 7.6 to add NaOH to adjust pH value；
(4) 75% of the wastewater effluent after neutralization is back in biochemistry pool；
(5) waste water for being not engaged in flowing back after neutralizing is entered into coagulating basin, adds bodied ferric sulfate to carry out coagulating sedimentation,
React for 40min.Wherein, the bodied ferric sulfate of 1mg is added in every 1L waste water.
The water outlet for taking coagulating sedimentation is detected that COD is 51.81mg/L.
It is computed, COD clearances are up to 98.43%.
Embodiment 3
The COD of secondary stock paper waste is 2855.36mg/L.
Above-mentioned waste water is processed in the steps below：
(1) secondary stock paper waste enters sedimentation basin after biochemistry pool process, then by sedimentation basin water outlet in pre-reaction
Sulphur acid for adjusting pH value is added to be 3.5 to 4.5 in pond；
(2) waste water after being acidified carries out Fenton reactions into Fenton reaction tanks, wherein adding hydrogen peroxide and sulphur
It is sour ferrous.The hydrogen peroxide of 0.1mL and the ferrous sulfate of 5g, reaction time 40min are added in wherein per 1L waste water.
(3) Fenton reaction water outlets are entered in neutralization pond, it is 7.2 to 7.6 to add NaOH to adjust pH value；
(4) 100% of the wastewater effluent after neutralization is back in biochemistry pool；
(5) waste water for being not engaged in flowing back after neutralizing is entered into coagulating basin, adds bodied ferric sulfate to carry out coagulating sedimentation,
React for 40min.Wherein, the bodied ferric sulfate of 3mg is added in every 1L waste water.
The water outlet for taking coagulating sedimentation is detected that COD is 42.58mg/L.
It is computed, COD clearances are up to 98.51%.
Embodiment 4
The COD of secondary stock paper waste is 3303.69mg/L.
Above-mentioned waste water is processed in the steps below：
(1) secondary stock paper waste enters sedimentation basin after biochemistry pool process, then by sedimentation basin water outlet in pre-reaction
Sulphur acid for adjusting pH value is added to be 3.5 to 4.5 in pond；
(2) waste water after being acidified carries out Fenton reactions into Fenton reaction tanks, wherein adding hydrogen peroxide and sulphur
It is sour ferrous.The hydrogen peroxide of 15mL and the ferrous sulfate of 20g, reaction time 120min are added in wherein per 1L waste water.
(3) Fenton reaction water outlets are entered in neutralization pond, it is 7.2 to 7.6 to add NaOH to adjust pH value；
(4) 150% of the wastewater effluent after neutralization is back in biochemistry pool；
(5) waste water for being not engaged in flowing back after neutralizing is entered into coagulating basin, adds bodied ferric sulfate to carry out coagulating sedimentation,
React for 60min.Wherein, the bodied ferric sulfate of 20mg is added in every 1L waste water.
The water outlet for taking coagulating sedimentation is detected that COD is 105.53mg/L.
It is computed, COD clearances are up to 96.81%.
Comparative example 1
The COD of secondary stock paper waste is 3303.69mg/L.
Above-mentioned waste water is processed using existing treatment technology：
(1) secondary stock paper waste enters sedimentation basin after biochemistry pool process, then by sedimentation basin water outlet in pre-reaction
Sulphur acid for adjusting pH value is added to be 3.5 to 4.5 in pond；
(2) waste water after being acidified carries out Fenton reactions into Fenton reaction tanks, wherein adding hydrogen peroxide and sulphur
It is sour ferrous.The hydrogen peroxide of 0.15mL and the ferrous sulfate of 1g, reaction time 40min are added in wherein per 1L waste water.
(3) Fenton reaction water outlets are entered in neutralization pond, it is 7.2 to 7.6 to add NaOH to adjust pH value；
(4) wastewater effluent after neutralizing is entered into coagulating basin, adds bodied ferric sulfate to carry out coagulating sedimentation, is reacted and is
40min.Wherein, the bodied ferric sulfate of 5mg is added in every 1L waste water.
The water outlet for taking coagulating sedimentation is detected that COD is 652.48mg/L.
It is computed, COD clearances are 80.25%.
The more existing handling process of handling process of the present invention is can be seen that by examples detailed above 1-4 and comparative example 1
COD clearances are significantly improved.
It should be noted that above-described embodiment the present invention will be described rather than limits the invention, and this
Art personnel can design without departing from the scope of the appended claims alternative embodiment.In claim
In, any reference symbol between bracket should not be configured to limitations on claims.Word "comprising" is not excluded for depositing
In element or step not listed in the claims.Word first, second and third use do not indicate that any order, can
These words are construed into title.
Claims (10)
1. a kind of secondary stock paper-making effluent treating process, comprises the steps：
The pH for passing through the secondary stock paper waste of biochemical treatment is adjusted to 3-5 carries out Fenton reactions；
The reacted water outlets of Fenton are adjusted into pH to 6.5-8, adjusted water outlet；
Being back to biochemistry pool by the 30% to 150% of the adjusting water outlet carries out secondary biochemistry, and remaining adjusting water outlet enters coagulation
Sedimentation basin carries out coagulating sedimentation.
2. handling process according to claim 1, wherein, in Fenton reactions, on the basis of 1L secondary stock paper wastes,
The usage amount of hydrogen peroxide is 0.1mL-15mL, and the usage amount of ferrous sulfate is 0.1g-20g.
3. handling process according to claim 2, wherein, in Fenton reactions, on the basis of 1L secondary stock paper wastes,
The usage amount of hydrogen peroxide is 0.15mL, and the usage amount of ferrous sulfate is 1g.
4. handling process according to claim 1, wherein, the reaction time of the Fenton reactions is 10-120 minutes.
5. handling process according to claim 4, wherein, the reaction time of the Fenton reactions is 40 minutes.
6. handling process according to claim 1, wherein, the 50% to 100% of the adjusting water outlet is back to biochemistry pool is carried out
Secondary biochemistry.
7. the handling process according to any one of claim 1-6, wherein, the time of coagulating sedimentation is 20-60 minutes,
Add one or more in bodied ferric sulfate, polyacrylamide and aluminium polychloride in coagulative precipitation tank as coagulant.
8. handling process according to claim 7, wherein, the time of coagulating sedimentation is 40 minutes.
9. handling process according to claim 7, wherein, on the basis of adjusting waste water by 1L, the dosage of coagulant is
1mg-20mg。
10. handling process according to claim 9, wherein, on the basis of adjusting waste water by 1L, the dosage of coagulant is
5mg。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109574276A (en) * | 2018-12-28 | 2019-04-05 | 江苏理文造纸有限公司 | A kind of wastewater treatment method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102260027A (en) * | 2011-07-06 | 2011-11-30 | 广州中环万代环境工程有限公司 | Method for treating papermaking wastewater |
| CN102557288A (en) * | 2010-12-07 | 2012-07-11 | 上海洗霸科技股份有限公司 | Pulping and papermaking wastewater processing technology |
| CN104445801A (en) * | 2014-10-24 | 2015-03-25 | 无锡伊佩克科技有限公司 | Papermaking wastewater treatment process |
-
2016
- 2016-12-19 CN CN201611174901.8A patent/CN106630415A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557288A (en) * | 2010-12-07 | 2012-07-11 | 上海洗霸科技股份有限公司 | Pulping and papermaking wastewater processing technology |
| CN102260027A (en) * | 2011-07-06 | 2011-11-30 | 广州中环万代环境工程有限公司 | Method for treating papermaking wastewater |
| CN104445801A (en) * | 2014-10-24 | 2015-03-25 | 无锡伊佩克科技有限公司 | Papermaking wastewater treatment process |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109574276A (en) * | 2018-12-28 | 2019-04-05 | 江苏理文造纸有限公司 | A kind of wastewater treatment method |
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Application publication date: 20170510 |