CN101786720A - Treatment method of river polluted bed mud - Google Patents
Treatment method of river polluted bed mud Download PDFInfo
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- CN101786720A CN101786720A CN201010136967A CN201010136967A CN101786720A CN 101786720 A CN101786720 A CN 101786720A CN 201010136967 A CN201010136967 A CN 201010136967A CN 201010136967 A CN201010136967 A CN 201010136967A CN 101786720 A CN101786720 A CN 101786720A
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- bed mud
- river
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- polluted bed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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Abstract
The invention discloses a treatment method of river polluted bed mud, comprising: adding oxidant into a polluted river to ensure that the bed mud on the surface layer is in the oxidation state; and preferably, adding water-solubility calcium salt and ferric salt. The invention ensures that the whole self-cleaning process of the river is in the aerobic state all the time by improving the oxidation reduction property of the polluted bed mud, thus creating conditions for aerobic microorganisms, amplifying bed mud aerobic microorganisms, and leading the aerobic microorganisms to digest organic pollutants; and in addition, the organic pollutants are completely oxidized and degraded into complete oxides such as CO2, H2O, NO2, SO4<-2> and the like, blackening and odor-causing substances, such as H2S, methyl mercaptan, FeS and the like produced during the anaerobic degradation of organic matters can be quickly oxidized, and the black and odor degree of water body can be effectively improved and remitted. Meanwhile, the calcium salt, the ferric salt and phosphorus-deposited nutritive salt are simultaneously added to lower river pollution degree and eutrophy level. The method of the invention has simple operation and strong selective pertinence, can treat in situ, almost does not damage the ecological balance of the original river and has favorable treatment effect.
Description
Technical field
The present invention relates to a kind of improvement method of river polluted bed mud, particularly a kind of is the improvement method of the polluted river of principal pollutant with the organic pollutant.
Background technology
Along with developing rapidly of industrial production and city, a large amount of trade effluents and sanitary sewage enter in the river, cause the deterioration of water quality of river and bed mud in river pollution serious day by day, and the riverbed, river are generally raised.With Guangzhou is example, and according to data in 2002, the river, Guangzhou often made the river be in anaerobic state mainly based on organic contaminations such as petroleum-type, polycyclic aromatic hydrocarbonss, produces many hazardous and noxious substances, comprises volatile sulfur compounds, methane etc.
The improvement of polluted river belongs to the difficult point of Pollution abatement in the world.From the fifties in last century, developed countries such as English, moral, U.S. just begin to consider to solve serious day by day stream pollution problem.Main improvement technology has aeration and bed mud dredging.Less, the instant effect of stream aeration technology front-end investment preferentially adopted in a lot of countries, but stream aeration technical operation expense is high, effect can not continue, and has shortcomings such as making the bed mud resuspending.
The another kind of improvement method commonly used in river is the dredging of polluted bed mud, and the bed mud to dredging carries out the strange land processing then.There is following problem in dredging: the one, and cost is higher, and the 2nd, the secondary pollution of stack up yard difficulty, bed mud and handling problem again.Research is also found: the bed mud dredging is improper, might make the ecological functions forfeiture of original, the mutually environmentally friendly one side of water body, the pollution buffering that has concurrently as the river, provide that benthos perches with growth and breeding, function and effect such as purify water, in a single day the ecosystem is destroyed, and will reduce these functions and the effect in river greatly.Bed mud after dredging needs stack up yard, and this is very difficult for the area densely populated as Guangdong, that the soil is in short supply.
Summary of the invention
Polluted river pollutes even without new external source, because the interaction of polluted bed mud and water body, water quality is difficult to be improved rapidly.Therefore, the key that is treated as river improvement of stream pollution bed mud.
For this reason, the invention provides a kind of original position improvement method of novel polluted river.
The technical solution used in the present invention is:
A kind of improvement method of river polluted bed mud comprises to polluted river and drops into oxygenant, makes the top layer bed mud be in oxidation state.
Preferably, also drop into water-soluble Ca salt, molysite at polluted river.
The present invention improves the redox property of bed mud by adding oxygenant, makes whole stream's self-purification process be in oxygen condition all the time.For aerobic microbiological creates conditions, amplification bed mud aerobic microbiological makes its digestion organic pollution materials, and makes the organic pollution materials complete oxidation be degraded to CO
2, H
2O, NO
2, SO
4 2-Etc. full oxide.And the H that promptly produces during the oxidation of organic compounds anaerobic degradation
2Blackening odor causing substances such as S, thiomethyl alcohol and FeS improve and alleviate the black smelly degree of water body effectively.Add calcium salt, molysite simultaneously, the Ca of generation
2+, Fe
3+The nutritive salt of plasma deposition phosphorus reaches and reduces stream pollution degree and eutrophy level simultaneously.
The inventive method is simple to operate, selects with strong pointsly, can original position administer, and the eubiosis in former river is not almost destroyed, and regulation effect is good, saves engineering cost.
Description of drawings
Fig. 1 is H
2O
2Dosage is to the graph of a relation of Eh raising and the influence of LOI clearance;
Fig. 2 is Fe
2+Dosage is to the graph of a relation of Eh raising and the influence of LOI clearance;
Fig. 3 is that pH changes the graph of a relation to Eh improves and the LOI clearance influences;
Fig. 4 is the graph of a relation of reaction times to Eh raising and the influence of LOI clearance;
Fig. 5 is the graph of a relation of clorox dosage to Eh raising and the influence of LOI clearance.
Embodiment
Below in conjunction with example, further specify the present invention.
The mass concentration of hydrogen peroxide is 30% in the experiment, and chlorine bleach liquor's mass concentration is 13%.
Bed mud in the experiment is to gather fresh bed mud along Guangzhou Shi Jinghe with the grab type sludge mining device, and it mainly contains organic pollutants and forms as shown in table 1.Below employed bed mud is the bed mud of Da Gang village sampling spot in the experiment.
Gather fresh bed mud along Guangzhou Shi Jinghe with the grab type sludge mining device, sealing is kept in the refrigerator;
Synthetic glass post (diameter 5cm) is fixing, then the one end is blocked, load onto filler from the other end, the bed mud that the 15cm that packs on filler is thick separates with barrier film between filler and the bed mud, is independent of each other with the material that guarantees top and bottom;
In the synthetic glass post, add oxygenant, reaction;
Reaction finishes the raising rate that organic removal rate LOI, redox potential Eh are calculated in the back, its calculation formula is: the organism after the organism-processing in the LOI=(former state)/organism * 100% in the former state, Eh * 100% in Eh raising rate=(Eh in the Eh-former state after the processing)/former state.
Find in the experiment:
H
2
O
2
Dosage is to the influence of Eh raising and LOI clearance
Fe
2+Dosage is 0.45g, and initial pH is 5, and the reaction times is when being 60h, H
2O
2Dosage is to the influential effect of organism and Eh.Along with H
2O
2The increasing of dosage, organic clearance is the shape of " triangle ".Work as H
2O
2During for 1mL, organic removal rate only is 51.3%; Work as H
2O
2When being increased to 2mL, organic removal rate also correspondingly is increased to 62.4%.Along with H
2O
2further add, promptly work as H
2O
2For about 5mL the time, organism that can be oxidized in the system of this oxidation is oxidized basically, and it is maximum that organic removal rate reaches.Work as H
2O
2When further adding, organic removal rate descends on the contrary.H
2O
2Dosage Eh is improved and the influence of LOI clearance as shown in Figure 1.
The Fe2+ dosage is to the influence of Eh raising and LOI clearance
Fe
2+When dosage was low, organic removal rate was probably about 50%, but along with Fe
2+" falling 7 " type appears in the increase of dosage, its whole external form.Organic removal rate rises to 90% by 50%, but along with Fe
2+The increase that dosage is follow-up, organic removal rate descends on the contrary.This is because at Fe
2+Add the initial stage, along with Fe
2+Increase, the quantity of hydroxyl radical free radical OH constantly increases, organic removal rate improves constantly.Along with Fe
2+Dosage further increase, though this moment speed of response also will increase, total clearance reduces on the contrary.Because in the process that generates hydroxyl radical free radical OH, Fe
2+Can consume section H
2O
2, promptly at identical H
2O
2Under the situation of dosage, Fe
2+Dosage is big more, used up H
2O
2Measure greatly more, so for the oxidizing reaction of this liquid-phase catalysis, catalyst amounts is unsuitable excessive, dosage is big more, and the reaction initial instant produces too much hydroxyl radical free radical OH and id reaction takes place is consumed.Fe
2+Aspect the raising of Eh, but there is the trend of falling after rising.Fe
2+Dosage Eh is improved and the influence of LOI clearance as shown in Figure 2.
PH changes the influence to Eh raising and LOI clearance
When pH=1, organic removal rate only is 38.4%, and along with improving constantly of pH, organic removal rate increases, and organic removal rate reaches maximum 58.3% when pH is 3.The pH value surpasses the increase organic removal rates reduction of 7 backs with pH value, when the pH value greater than 8 the time, the organic removal rate in the system is very low.Suitable pH scope is at 2-4.The raising rate of Eh is but descending simultaneously.This may be that Fe has taken place
2++ OH
-+ 2H
2O → Fe (OH)
3+ 2H
+Reaction, same Fe
3+Also may generate Fe (OH)
3Colloid.And when pH is too high, promptly under the alkaline condition, H
2O
2Decomposition rate is slow, and the amount of the OH free radical of generation reduces, thereby has influenced its oxidation capacity.And the oxidizing potential of OH is also relevant with H+ concentration.PH change to Eh improve and the influence of LOI clearance as shown in Figure 3.
Reaction times is to the influence of Eh raising rate and organic removal rate
At Fe
2+Dosage 0.45g, H
2O
2Dosage 4mL, initial pH under 5 the condition, investigate the influence of reaction times to Eh raising rate and organic removal rate.When 10min was carried out in reaction, organic removal rate reached more than 45%, illustrated that the speed of Fenton reaction initial stage is very fast; In the preceding 70min of reaction, organic clearance does not improve along with the prolongation of time, shows that speed of reaction is basicly stable, and reactant concn is enough to keep the requirement of speed of reaction, and a large amount of organism is oxidized.Surpass 70min when the time, reaction is tending towards fully, and organic clearance no longer increases along with the prolongation of time, so the used time 70min of this bed mud of Fenton agent treated gets final product.The raising of same Eh from originally about 20% in 100min, bring up to 50% and big variation no longer takes place, this equally also is the result that it is in stable state.Reaction times to the influence of Eh raising rate and organic removal rate as shown in Figure 4.
The clorox dosage is to the influence of Eh raising and LOI clearance
At pH=6, during normal temperature and pressure reaction 48h, when clorox 2 to 11mL the time, organic clearance changes to 55.6% by 30.1%, its variation presents the trend that grows steadily, this may be relevant with the lasting decomposition of HClO wherein.Later stage is along with the continuous adding of clorox, its organic clearance is not seen obvious raising, this may be relevant with available chlorine content wherein, be that quantitative HClO is when reaction is finished, it is complete that its oxidation capacity does not reach, along with the carrying out of reaction, the HClO that the HClO that the last stage produces is reacted the later stage generation overflows.Continuous adding with clorox, the clearance of machine thing do not see obvious raising different be that the Eh of bed mud promotes steadily, progressively rises to 56.4% by initial 20.3%, this may be to reach in front under the situation of certain infiltration, follow-uply can't proceed to produce " overlapping " effect.The hypochlorous acid dosage Eh is improved and the influence of LOI clearance as shown in Figure 5.
According to experimental result, the optimum reaction condition that obtains this experiment is:
Fe
2+Dosage 0.25g, H
2O
2Dosage 3mL, reaction times 60h, initial pH is 5, this moment, organic clearance reached 90.12%;
At H
2O
2In the experiment of the co-oxidation of NaClO, the optimum process condition that obtains organic matter removal is: H
2O
2Dosage 2ml, the time of reaction is 12h, and the dosage of NaClO is 9ml, and the time of reaction is 48h.This moment, organic removal efficient can reach 85.2%.
According to above rule, those skilled in the art also can determine the treatment condition of polluted river bed mud easily.
Water body at polluted river adds water-soluble Ca salt, molysite, generates Ca
2+/ Fe
3+, following reaction takes place in water body:
Ca
2+/ Fe
3+Compound → the coprecipitate of+phosphorus → stable the bed mud that is adsorbed in
Reduced the content of free phosphorus in the sewage so effectively, reduced the eutrophication degree of sewage, and then algae is increased water quality to the demand of oxygen in the minimizing sewage.
Claims (4)
1. the improvement method of a river polluted bed mud comprises to polluted river and drops into oxygenant, makes the top layer bed mud be in oxidation state, improves redox potential, reduces organic content.
2. the improvement method of a kind of river polluted bed mud according to claim 1, described oxygenant comprises Fenton reagent (hydrogen peroxide and molysite), hypochlorite and composition thereof.
3. the improvement method of a kind of river polluted bed mud according to claim 1 is characterized in that: add the nutritive salt of calcium salt, molysite plasma deposition phosphorus simultaneously, reach and reduce stream pollution degree and eutrophy level simultaneously.
4. the improvement method of a kind of river polluted bed mud according to claim 1 is characterized in that: according to pollution condition, and selective oxidation agent and array configuration, and control corresponding influence factor and processing condition.
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| CN201010136967A CN101786720A (en) | 2010-03-31 | 2010-03-31 | Treatment method of river polluted bed mud |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102285746A (en) * | 2011-06-09 | 2011-12-21 | 深圳市市政设计研究院有限公司 | Method for controlling odor of polluted bottom sediment |
| CN102320710A (en) * | 2011-06-09 | 2012-01-18 | 香港大学 | Method for controlling polluted bottom sediment odor |
| CN105502867A (en) * | 2016-02-06 | 2016-04-20 | 广东灵捷制造化工有限公司 | Method for treating black and odorous water body bottom mud through microelectrolysis material |
| CN108002679A (en) * | 2017-12-06 | 2018-05-08 | 中国科学院南京地理与湖泊研究所 | A kind of in-situ treatment method of black and odorous water deposit |
| CN113526840A (en) * | 2020-04-22 | 2021-10-22 | 水木金谷环境科技有限公司 | Method for treating polluted bottom mud by organic acid chelated ferrous iron catalytic oxidation technology |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1787974A (en) * | 2003-04-23 | 2006-06-14 | 凯米拉·开米公司 | Method of treating digested sludge |
-
2010
- 2010-03-31 CN CN201010136967A patent/CN101786720A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1787974A (en) * | 2003-04-23 | 2006-06-14 | 凯米拉·开米公司 | Method of treating digested sludge |
Non-Patent Citations (1)
| Title |
|---|
| 《水处理技术》 20080131 孙远军等 受污染沉积物原位修复技术研究进展 第14－18页 1-4 第34卷, 第1期 2 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102285746A (en) * | 2011-06-09 | 2011-12-21 | 深圳市市政设计研究院有限公司 | Method for controlling odor of polluted bottom sediment |
| CN102320710A (en) * | 2011-06-09 | 2012-01-18 | 香港大学 | Method for controlling polluted bottom sediment odor |
| CN102320710B (en) * | 2011-06-09 | 2013-08-28 | 香港大学 | Method for controlling polluted bottom sediment odor |
| CN102285746B (en) * | 2011-06-09 | 2013-08-28 | 深圳市市政设计研究院有限公司 | Method for controlling odor of polluted bottom sediment |
| CN105502867A (en) * | 2016-02-06 | 2016-04-20 | 广东灵捷制造化工有限公司 | Method for treating black and odorous water body bottom mud through microelectrolysis material |
| CN105502867B (en) * | 2016-02-06 | 2019-04-05 | 广东灵捷制造化工有限公司 | A method of black and odorous water bed mud is handled with micro-electrolysis material |
| CN108002679A (en) * | 2017-12-06 | 2018-05-08 | 中国科学院南京地理与湖泊研究所 | A kind of in-situ treatment method of black and odorous water deposit |
| CN113526840A (en) * | 2020-04-22 | 2021-10-22 | 水木金谷环境科技有限公司 | Method for treating polluted bottom mud by organic acid chelated ferrous iron catalytic oxidation technology |
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Application publication date: 20100728 |