CN102680443A - Method for evaluating chemical conditioning effect of domestic sludge - Google Patents
Method for evaluating chemical conditioning effect of domestic sludge Download PDFInfo
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- CN102680443A CN102680443A CN2012101441318A CN201210144131A CN102680443A CN 102680443 A CN102680443 A CN 102680443A CN 2012101441318 A CN2012101441318 A CN 2012101441318A CN 201210144131 A CN201210144131 A CN 201210144131A CN 102680443 A CN102680443 A CN 102680443A
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Abstract
The invention relates to a method for evaluating a chemical conditioning effect of domestic sludge. The method is characterized in that the content of dissoluble organic matters in the sludge subjected to chemical conditioning is measured through three-dimensional fluorescence so that the effect of the chemical conditioning of the sludge is determined. The method comprises the following steps of: taking the sludge and adding a chemical coagulation agent according to different dosages of the sludge for conditioning, enabling supernate to pass through a cellulose acetate fiber membrane, diluting filtrate by using water for later use, measuring a three-dimensional fluorogram of diluted filtrate by using a three-dimensional fluorescence spectroscopy; and with the dosage of the coagulation agent as a horizontal coordinate and the fluorescence strength as a vertical coordinate, drawing a curve and selecting an optical dosage of the coagulation agent. The method provided by the invention has the advantages of high sensitivity, rapidness and convenience, and can be effectively used in optimization of the dosage of the chemical coagulation agent.
Description
Technical field
The present invention relates to field of sludge treatment, be specifically related to a kind of domestic sludge chemical conditioning Evaluation on effect method.
Background technology
Mud is the product of municipal wastewater treatment plant, has become one of current main difficult problem that perplexs China's urban environment.Along with the increase of town sewage processing power, the whole nation in 2008 is produced dried mud amount per year and is reached 3,660,000 tons, and wet mud amount is 1,830 ten thousand tons, expects " 12 " end, produces dried mud amount per year and will reach 8,150,000 tons, and wet mud amount will reach 40,720,000 tons.So high mud generation if can not get dealing carefully with, will inevitably produce serious influence to environment.
In general, excess sludge is colloidal state, and particle is thinner, and water percentage is high, and the dehydration difficulty is bigger.The effective dehydration that realizes mud is significant, both can effectively reduce moisture percentage in sewage sludge, thereby reduces sludge quantity, is convenient to the recycling of mud again, like burning, compost and landfill.Chemical conditioning is an effective means of improving dehydration property, how to realize that the optimization of medicament seems very crucial.Mud resistivity (SRF) is the composite target of expression sludge filtration characteristic, and the resistance the when mud that is meant unit mass filters under certain pressure on the unit filter area is evaluation dehydration property and the chemical conditioning Evaluation on effect index of using always.The key step of existing mensuration mud resistivity is: get mud sample 100mL to be measured in graduated cylinder; Under the condition of constant air pressure P=0.6MPa, filter; Every at a distance from 10s record first-time filtrate volume, cake layer occurs stopping suction filtration till the crack in funnel; Utilize difference assay to measure filter cake moisture content, gather through various indexs at last and calculate the mud resistivity.The reappearance of this method length experimental period, complicated operation, experimental data is bad.Therefore, be badly in need of a kind of high sensitivity and dehydration property evaluation means optionally.
Fluorescence spectrum is the characteristic and the intensity of the fluorescence that taken place when utilizing some material molecule to receive rayed, the method for carrying out the qualitative analysis or the quantitative test of material.This method has been widely used in specific pollutant in water quality of river monitoring, the sewage treatment plant's operation control industrial waste water, the water fields such as monitoring of DBPs in the oil and drinking water treatment.Research shows that the composition of the dissolved organic matter in dehydration property and the mud supernatant has relation, especially protein content.Measure through three-dimensional fluorescence, can the fast measuring water-outlet body in the fluorescence intensity of protein peak, the excitation/emission wavelength is respectively tyrosine class (275/340nm and 275/310nm), tryptophane class (225 –, 237/340 – 381nm).Usually, in mud, add chemical coagulator after, the protein that has in the mud supernatant can change the mud solid phase over to because of charging neutrality and suction-operated, then the albumen fluorescence peak intensity of clear liquid can weaken, thereby reaches the purpose of the chemical conditioning effect of sign mud.
Summary of the invention
The purpose of this invention is to provide a kind of domestic sludge chemical conditioning Evaluation on effect method, said evaluation method have the mensuration process quick, easy, need not beneficial effects such as other chemical reagent, sample determination cycle be short.
Technical scheme of the present invention is:
A kind of domestic sludge chemical conditioning Evaluation on effect method is characterized in that measuring the effect that in the mud of the chemical conditioning content of dissolved organic matter is confirmed Sludge Chemical Conditioning through three-dimensional fluorescence.
Above-mentioned Sludge Chemical Conditioning Evaluation on effect method may further comprise the steps:
1) gets pending thickened sludge respectively; In pending thickened sludge, add chemical coagulator with the ratio that increases progressively based on thickened sludge dry weight 5% ~ 30% weight gradient and carry out Sludge Chemical Conditioning; After accomplishing chemical conditioning, the mud after the conditioning is staticly settled 20-45min;
2) the supernatant peracetic acid fibrous filter membrane after will staticly settling must be filtrated, and water will be filtrated dilution 100-300 doubly, dilution;
3) dilution of getting the experiment effective dose is measured its fluorescence intensity, excitation wavelength lambda with the three-dimensional fluorescence spectrum appearance
Ex=250-600nm, emission wavelength lambda
Em=200-450nm, exciting and launching slit width is 5nm or 10nm, sweep velocity is 12000-60000nm/min;
4) be horizontal ordinate with the chemical coagulator dosage; The fluorescence intensity that step 3) records is the ordinate curve plotting; Estimate the Sludge Chemical Conditioning effect according to this curve, and to choose the coagulant charging quantity that fluorescence intensity reaches the fluorescence intensity low spot after steadily at first be optimal dose.
Particularly, above-mentioned Sludge Chemical Conditioning Evaluation on effect method may further comprise the steps:
1) get an amount of mud and add the chemical coagulator of various dose respectively, staticly settle 30min, the wherein said dosage that adds chemical coagulator is the 10%-15% of mud dry weight;
2) supernatant after will staticly settling is crossed 0.45 μ m acetate fiber filter membrane, must filtrate, water 200 times of the dilutions of will filtrating, dilution;
3) dilution of getting 3-10ml is measured its fluorescence intensity, excitation wavelength lambda with the three-dimensional fluorescence spectrum appearance
Ex=230nm, emission wavelength lambda
Em=350nm, exciting and launching slit width is 10nm, sweep velocity is 12000nm/min;
4) with the coagulant charging quantity be horizontal ordinate, fluorescence intensity is the ordinate curve plotting, estimates the Sludge Chemical Conditioning effect according to this curve, and to choose the coagulant charging quantity that fluorescence intensity reaches the fluorescence intensity low spot after steadily at first be optimal dose.
Wherein, above-mentioned chemical coagulator is selected from aluminium polychloride (PAC), iron chloride and high-efficiency polymerization aluminum chloride (HPAC).In said method, along with the increase of coagulant charging quantity, fluorescence intensity level can reduce up to stable gradually, and the coagulant chemical conditioning dosage that reaches the fluorescence intensity minimum point at first is optimal dose.Technical scheme of the present invention is compared the mud resistivity, more high sensitivity, fast, evaluating chemical conditioning effect easily, finally realize the optimization of added amount of chemical.
Description of drawings
Fig. 1 is the optimized experiment process figure of medicament.
Fig. 2 is the graph of a relation of coagulant charging quantity and fluorescence intensity and mud resistivity;
Wherein, 2a is the graph of a relation of coagulant charging quantity and corresponding supernatant protein fluorescence intensity, and 2b is the graph of a relation that coagulant accounts for mud dry weight number percent and corresponding mud resistivity, and the horizontal line among Fig. 2 b is the SRF value that is prone to dewatered sludge; T is the best point of coagulant charging quantity (in butt).
Embodiment
The mud that uses in following examples is taken from north, Beijing river sewage treatment plant;
[embodiment 1] embodiment of the present invention is: get sewage treatment plant's thickened sludge (water percentage is 97-98%) 500mL respectively; Then according to 5%, 10%, 15% of mud dry weight; 20%; 25%, 30% adding aluminium polychloride or high-efficiency polymerization aluminum chloride (liquid aluminium polychloride and efficient liquid aluminium polychloride chlorine monoxid content are 10%) carry out sludge conditioning, open the program control test of TA6-1 and stir appearance (Wuhan Hengling Technology Co., Ltd.); The 200rpm of elder generation stirs 30s soon, and 50rpm stirs 2min slowly then.After mud after the conditioning placed deposition 30min, get an amount of supernatant and cross 0.45 μ m acetate fiber filter membrane (the sincere film development in science and technology of Beijing Sheng He center), and will filtrate with deionized water and to dilute 200 times; Get the 5ml dilution and pour quartzy fluorescence cuvette into, adopt Hitachi F-4500 fluorophotometer on FL Solutions interface, to carry out the mensuration of three-dimensional fluorescence, it is excitation source that the fluorescence spectrophotometer nitometer adopts deuterium lamp, excitation wavelength lambda
Ex=250-600nm, emission wavelength lambda
Em=200-450nm, exciting and launching slit width is 10nm, sweep velocity is 12000nm/min, obtains the three-dimensional fluorescence spectrogram of chemical conditioning front and back mud supernatant; With Excel data are produced then; And therefrom to select excitation/emission be the fluorescence intensity level that 230/350nm is ordered; Draw the graph of a relation of coagulant charging quantity and corresponding supernatant protein fluorescence intensity level; The point that wherein fluorescence intensity level is lower is the preferable of chemical coagulator and adds a little, shown in Fig. 2 a; Wherein, along with the increase of coagulant charging quantity, fluorescence intensity level can reduce up to stable gradually, and choosing the coagulant chemical conditioning dosage that reaches the fluorescence intensity minimum point at first is optimal dose.
By the mud resistivity of the employed thickened sludge of conventional method mensuration present embodiment, the result shows that the evaluation method of present embodiment is similar with the result of the mud resistivity assay method of routine shown in Fig. 2 b.
[embodiment 2] iron chloride (mass concentration is 40%) according to embodiment 1 described method and step, can reach the effect of selecting optimum chemical coagulant dosage dosage as chemical coagulator equally.
Claims (4)
1. domestic sludge chemical conditioning Evaluation on effect method is characterized in that measuring the effect that in the mud of the chemical conditioning content of dissolved organic matter is confirmed Sludge Chemical Conditioning through three-dimensional fluorescence.
2. the described evaluation method of claim 1 is characterized in that said method comprising the steps of:
1) gets pending thickened sludge respectively; In pending thickened sludge, add chemical coagulator with the ratio that increases progressively based on thickened sludge dry weight 5% ~ 30% weight gradient and carry out Sludge Chemical Conditioning; After accomplishing chemical conditioning, the mud after the conditioning is staticly settled 20-45min;
2) the supernatant peracetic acid fibrous filter membrane after will staticly settling must be filtrated, and water will be filtrated dilution 100-300 doubly, dilution;
3) dilution of getting the experiment effective dose is measured its fluorescence intensity, excitation wavelength lambda with the three-dimensional fluorescence spectrum appearance
Ex=250-600nm, emission wavelength lambda
Em=200-450nm, exciting and launching slit width is 5nm or 10nm, sweep velocity is 12000-60000nm/min;
4) be horizontal ordinate with the chemical coagulator dosage; The fluorescence intensity that step 3) records is the ordinate curve plotting; Estimate the Sludge Chemical Conditioning effect according to this curve, and to choose the coagulant charging quantity that fluorescence intensity reaches the fluorescence intensity low spot after steadily at first be optimal dose.
3. evaluation method as claimed in claim 2 is characterized in that, said method comprising the steps of:
1) get an amount of mud and add the chemical coagulator of various dose respectively, staticly settle 30min, the wherein said dosage that adds chemical coagulator is the 10%-15% of mud dry weight;
2) supernatant after will staticly settling is crossed 0.45 μ m acetate fiber filter membrane, must filtrate, water 200 times of the dilutions of will filtrating, dilution;
3) dilution of getting 3-10ml is measured its fluorescence intensity, excitation wavelength lambda with the three-dimensional fluorescence spectrum appearance
Ex=230nm, emission wavelength lambda
Em=350nm, exciting and launching slit width is 10nm, sweep velocity is 12000nm/min;
4) with the coagulant charging quantity be horizontal ordinate, fluorescence intensity is the ordinate curve plotting, estimates the Sludge Chemical Conditioning effect according to this curve, and to choose the coagulant charging quantity that fluorescence intensity reaches the fluorescence intensity low spot after steadily at first be optimal dose.
4. like claim 2 or 3 described evaluation methods, wherein said chemical coagulator is selected from aluminium polychloride, iron chloride and high-efficiency polymerization aluminum chloride.
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| CN105906046A (en) * | 2016-06-24 | 2016-08-31 | 燕京啤酒(桂林漓泉)股份有限公司 | Method for judging degree of influences of chemical reagent production application on normal running of sewage anaerobic treatment system |
| CN110255707A (en) * | 2019-05-22 | 2019-09-20 | 杭州师范大学 | A method of reactor operating status is monitored using triaxial stress condition |
| CN115572040A (en) * | 2022-10-19 | 2023-01-06 | 北京尚水清源水处理技术有限公司 | Method for judging anaerobic digestion sludge conditioning effect |
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| CN110255707A (en) * | 2019-05-22 | 2019-09-20 | 杭州师范大学 | A method of reactor operating status is monitored using triaxial stress condition |
| CN115572040A (en) * | 2022-10-19 | 2023-01-06 | 北京尚水清源水处理技术有限公司 | Method for judging anaerobic digestion sludge conditioning effect |
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Application publication date: 20120919 |