CN103288316A - In-plant decrement treatment method for urban sludge - Google Patents
In-plant decrement treatment method for urban sludge Download PDFInfo
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- CN103288316A CN103288316A CN2013102746784A CN201310274678A CN103288316A CN 103288316 A CN103288316 A CN 103288316A CN 2013102746784 A CN2013102746784 A CN 2013102746784A CN 201310274678 A CN201310274678 A CN 201310274678A CN 103288316 A CN103288316 A CN 103288316A
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Abstract
The invention discloses an in-plant decrement treatment method for urban sludge, which comprises the following steps of: taking surplus sludge in an urban sewage treatment plant, adding the surplus sludge into modified liquid polymeric ferric sulfate, and carrying out stirring and coagulation on the obtained mixture so as to obtain mixed liquor; pumping the mixed liquor into a gravity concentration pool, and carrying out natural sedimentation on the mixed liquor so as to obtain a supernatant fluid and concentrated sludge; adding an industrial oxalic acid into the concentrated sludge at a constant speed, and carrying out modification treatment on the obtained mixture through stirring reaction; carrying out filtration on the concentrated sludge subjected to modification treatment by using conventional mechanical equipment so as to obtain filter liquor and sludge residues; after the pH value of the filter liquor is adjusted by using lime, feeding the filter liquor back to a sewage treatment system of the sewage treatment plant; and carrying out resource utilization on the sludge residues according to the compositions and properties thereof. The method disclosed by the invention is not only applicable to the deep dehydration decrement of urban sludge, but also applicable to the sludge treatment produced by industrial wastewater.
Description
Technical field
The excess sludge deep dehydration that the present invention relates to sewage work carries out the method for decrement, is specially the method for decrement treatment in a kind of city sludge factory.
Background technology
Along with the lifting of people's quality of life, the raising that environmental protection standard requires, national town sewage plans that the sludge reduction harmlessness disposing rate of urban wastewater treatment firm reaches more than 65%, requires moisture percentage in sewage sludge to reach below 50% during handling " 12 ".The construction in succession of sewage work, the generation of mud increases fast, and mud also will be considerably beyond 3,800 ten thousand tons.It is the requisite measure that realizes the final processing target of sewage that the standardized treatment of mud is disposed.
For the control sludge of sewage treatment plant produces secondary pollution to environment, about enviromental protection law rules and technical policy requirement, the corresponding sludge of sewage treatment plant of having formulated of various places competent authorities is disposed ad hoc planning according to country.After undressed mud enters environment, directly water body, soil and atmospheric environment are caused serious secondary pollution, not only reduced the effective capacity of Sewage treatment systems, and ecotope and mankind's activity have been constituted serious harm.At present, most mud do not obtain appropriate disposal, and the phenomenon of arbitrarily abandoning, toppling over is ubiquity also, the secondary pollution problem that causes thus can not be ignored, to a certain extent even offset the achievement that pollution treatment reduces discharging.Even improper because of sludge disposal, caused the environmental pollution event.
Mud is the solidliquid mixture that produces in each unit of Sewage treatment systems, is the accessory products of sewage treatment process, is the extremely complicated heterogeneous body that a kind of organic relic, bacterium thalline, inorganic particle, colloid etc. are formed.The moisture percentage in sewage sludge height, the excess sludge water ratio reaches 97.5 ~ 99.8%, still moisturely after the concentration reaches 75 ~ 82%, and volume is bigger, transportation inconvenience, landfill inconvenience brings serious secondary pollution and potentially contaminated.
Just because of high this notable attribute of moisture percentage in sewage sludge is therefore bulky, for long distance transhipment and the subsequent disposal disposal of mud brought economically, on the environment, on the safety and technical great difficulty.At present, the treatment technology of domestic sludge dewatering and method mainly contain technologies such as mechanical dehydration, physics mummification.And find that by practical application these technology investments are big, and energy consumption is big, and the running cost height needs to add multiple a large amount of flocculations (coagulation) agent and processing brings difficulty to subsequent technique, still exists the dehydration difficulty very big.Generally the mud after dehydration still moisture 75 ~ 82%.The annual 3800 ten thousand tons of mud that produce in the whole nation carry out landfill, then are equivalent to account for 3.42 ten thousand mu of land resourcess, folding 22.8km
2
By the method for decrement treatment in the factory, can save huge land resources, solve the quagmire in China city sludge besieged city, be conducive to city planning and build development, be conducive to improve human settlement and quality of life.The annual traffic capacity of mud transhipment that will reduce is more than 3,800 ten thousand tons simultaneously, transport 15 tons for 1 time by every mud transport trolley, come and go 50 km meters, annual about 12,667 ten thousand kms of automobile transport mileage that reduce, per 100 km load-carryings need to consume 30 liters of fuel oil meters for 15 tons, can reduce oil fuel and consume about 3,800 ten thousand liters, this improves urban air-quality to reducing urban atmospheric pollution, improves urban traffic conditions, advance energy-saving and emission-reduction, all have very important meaning.
City sludge for sludge ultimate disposal provides space more widely, can be used for composting, building materials, fuel, high-quality landfill with overburden soil etc. in factory after the decrement treatment.Therefore, research and development utilize the novel method of decrement treatment in a kind of city sludge factory, can realize the deep dehydration decrement, for the minimizing of mud, innoxious, resource utilization, low carbonization is handled is very necessary, will produce very huge social benefit, economic benefit, ecological benefits and environmental benefit.
Summary of the invention
Technical problem solved by the invention is to provide the method for decrement treatment in a kind of city sludge factory, to solve the problem in the background technology:
Technical problem solved by the invention realizes by the following technical solutions:
The method of decrement treatment in a kind of city sludge factory may further comprise the steps:
(1) excess sludge pre-treatment: get the urban wastewater treatment firm water ratio and be 97.5% ~ 99.8% excess sludge, being 9% ~ 11.5% modified liquid bodied ferric sulfate and excess sludge with full weight of iron mark adds the modified liquid bodied ferric sulfate in the ratio of mass ratio 0.01 ~ 0.1:1, after stirring coagulation 10 ~ 35min, make mixed solution;
(2) natural subsidence realizes concentrating: described mixed solution is pumped into the gravity concentration basin, natural subsidence through 30 ~ 120min, reach the preliminary purpose that concentrates, obtain supernatant liquor and thickened sludge, described supernatant liquor is discharged naturally from the top of gravity concentration basin, send the Sewage treatment systems of sewage work back to, described thickened sludge is discharged from the bottom of gravity concentration basin, enter next procedure and handle;
(3) the thickened sludge modification is handled: in the thickened sludge after discharge, content 96% ~ 98% technical grade oxalic acid and thickened sludge are at the uniform velocity added technical grade oxalic acid in the ratio of mass ratio 0.005 ~ 0.01:1, stirring reaction 15 ~ 60min, under the reductive action of technical grade oxalic acid, microorganism in the thickened sludge is killed, and decompose, water is separated out in the body of microorganism;
(4) mechanical filter solid-liquid separation: the thickened sludge to after handling through modification, filter with conventional mechanical equipment such as whizzer, belt filter press, plate-and-frame filter press, reach the purpose of solid-liquid separation, obtain filtered liquid and sludge silt;
(5) after filtered liquid is regulated pH value to 7.5 ~ 9 with lime, the Sewage treatment systems of sending sewage work back to;
(6) sludge silt carries out the ultimate disposal of recycling according to its composition and character.
Beneficial effect
1, the present invention has realized the excess sludge to sewage work's generation, and deep dehydration is carried out in butt joint on the spot, and required installations and facilities can be directly installed on sewage work dehydration workshop and produce.Can save great amount of investment, land used and running cost thereof.
2, after the present invention taked pretreatment mode to stir coagulation, coagulation performance was good, and mud is agglomerating closely knit, and settling velocity is fast, for final deep dehydration provides condition.
3, dosage is few, and is with low cost, and processing costs can be saved 30%-50%.
4, the excess sludge of the present invention's processing, the energy fast dewatering drops to 50% by its former water ratio 97.5% ~ 99.8%, and the following process recycling for mud provides more wide space simultaneously.
5, the present invention can adopt the conventional equipment facility, the level of automation height, and Working environment is good, and is easy to operate, and the construction period is short, and production cost is low.
6, the inventive method is not only applicable to the deep dehydration decrement of city sludge, is applicable to the sludge treatment that trade effluent produces yet.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1 excess sludge sample is taken from Changsha sewage work, and average moisture content is 99.5%, and average solid content is 0.5%.Sample for analysis is dried to constant weight under 105 ℃ of constant temperature, 8 hours condition, it is analyzed as table 1.
Table 1 excess sludge sample water ratio is analyzed
Get excess sludge 2000g and place beaker, add full weight of iron mark and be 11% modified liquid bodied ferric sulfate 40g, after slowly stirring evenly, the coagulation time is kept 20min, then mixed solution is imported the gravity concentrating unit, carry out natural subsidence, behind 45 min, get supernatant liquor 1800g with siphonage, thickened sludge 200g weighs.
The thickened sludge 200g that obtains adds content 96% technical grade oxalic acid 1.2g, and stirring reaction 25min carries out modification; With the thickened sludge after the modification with 220V the vacuum filtration machine of 350W, suction filtration 3 min carry out solid-liquid separation, obtain filtered liquid and sludge silt.
Weight in wet base and dry weight analysis such as the table 2 of the supernatant liquor that continuous 3 experiments obtain, thickened sludge, sludge silt.
Weight in wet base and the dry weight analysis of the sludge silt that continuous 3 experiments of table 2 obtain
As shown in Table 2, after excess sludge adopts present method to handle, the sludge silt that produces, energy satisfied " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) the middle moisture percentage in sewage sludge that requires is lower than 65% the highest limit value, and this sludge silt can carry out the recycling that following process is handled.
Embodiment 2 excess sludge samples are taken from Yongzhou, Hunan sewage work, and average moisture content is 98.545%, and average solid content is 1.455%.Treatment process is as embodiment 1, and its excess sludge sample water ratio is analyzed as table 3.And by above-mentioned analytical procedure, get excess sludge 2000g equally and be used for experiment, the weight in wet base of the supernatant liquor that obtains, thickened sludge, sludge silt and dry weight analysis such as table 4.
Table 3 excess sludge sample water ratio is analyzed
Weight in wet base and the dry weight analysis of the sludge silt that continuous 3 experiments of table 4 obtain
As shown in Table 4, after excess sludge adopts present method to handle, the sludge silt that produces, energy satisfied " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) the middle moisture percentage in sewage sludge that requires is lower than 65% the highest limit value, and this sludge silt can carry out the recycling that following process is handled.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (3)
1. the method for decrement treatment in the city sludge factory is characterized in that: may further comprise the steps:
(1) excess sludge pre-treatment: get the urban wastewater treatment firm water ratio and be 97.5% ~ 99.8% excess sludge, being 9% ~ 11.5% modified liquid bodied ferric sulfate and excess sludge with full weight of iron mark adds the modified liquid bodied ferric sulfate in the ratio of mass ratio 0.01 ~ 0.1:1, after stirring coagulation 10 ~ 35min, make mixed solution;
(2) natural subsidence realizes concentrating: described mixed solution is pumped into the gravity concentration basin, natural subsidence through 30 ~ 120min, reach the preliminary purpose that concentrates, obtain supernatant liquor and thickened sludge, described supernatant liquor is discharged naturally from the top of gravity concentration basin, send the Sewage treatment systems of sewage work back to, described thickened sludge is discharged from the bottom of gravity concentration basin, enter next procedure and handle;
(3) the thickened sludge modification is handled: in the thickened sludge after discharge, content 96% ~ 98% technical grade oxalic acid and thickened sludge are at the uniform velocity added technical grade oxalic acid in the ratio of mass ratio 0.005 ~ 0.01:1, stirring reaction 15 ~ 60min, under the reductive action of technical grade oxalic acid, microorganism in the thickened sludge is killed, and decompose, water is separated out in the body of microorganism;
(4) mechanical filter solid-liquid separation: the thickened sludge to after handling through modification, filter with conventional mechanical equipment such as whizzer, belt filter press, plate-and-frame filter press, reach the purpose of solid-liquid separation, obtain filtered liquid and sludge silt;
(5) after filtered liquid is regulated pH value to 7.5 ~ 9 with lime, the Sewage treatment systems of sending sewage work back to;
(6) sludge silt carries out the ultimate disposal of recycling according to its composition and character.
2. the method for decrement treatment in a kind of city sludge according to claim 1 factory, it is characterized in that: the full weight of iron mark of described modified liquid bodied ferric sulfate is 11%, and the content of described technical grade oxalic acid is 96%.
3. the method for decrement treatment in a kind of city sludge according to claim 1 factory, it is characterized in that: the mass ratio of modified liquid bodied ferric sulfate and excess sludge is 0.02:1, the mass ratio of described technical grade oxalic acid and thickened sludge is 0.006:1.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103894390A (en) * | 2013-10-12 | 2014-07-02 | 南京科盛环保科技有限公司 | Process for governing and repairing polluted sediments of water area |
| CN103992014A (en) * | 2014-05-26 | 2014-08-20 | 山东亚欧实业有限公司 | Novel process for processing municipal sludge |
| CN105293845A (en) * | 2015-10-26 | 2016-02-03 | 广州立白企业集团有限公司 | Treatment method for sludge reduction |
| CN106006888A (en) * | 2016-06-29 | 2016-10-12 | 浙江瑞霖环保科技有限公司 | Sewage sludge joint treatment technology |
| CN113325122A (en) * | 2021-05-20 | 2021-08-31 | 南开大学 | Method for determining organic pollutants enriched by colloid components in site-contaminated soil |
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| JPS60129200A (en) * | 1983-12-15 | 1985-07-10 | Kurita Water Ind Ltd | Dehydrating method of sludge |
| CN101134633A (en) * | 2007-07-27 | 2008-03-05 | 苏州金桨节能与环保科技有限公司 | Material and method for materialized sludge deweighting process |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103894390A (en) * | 2013-10-12 | 2014-07-02 | 南京科盛环保科技有限公司 | Process for governing and repairing polluted sediments of water area |
| CN103894390B (en) * | 2013-10-12 | 2015-02-04 | 南京科盛环保科技有限公司 | Process for governing and repairing polluted sediments of water area |
| CN103992014A (en) * | 2014-05-26 | 2014-08-20 | 山东亚欧实业有限公司 | Novel process for processing municipal sludge |
| CN103992014B (en) * | 2014-05-26 | 2015-11-25 | 山东亚欧实业有限公司 | Municipal sludge New Process for Treatment |
| CN105293845A (en) * | 2015-10-26 | 2016-02-03 | 广州立白企业集团有限公司 | Treatment method for sludge reduction |
| CN106006888A (en) * | 2016-06-29 | 2016-10-12 | 浙江瑞霖环保科技有限公司 | Sewage sludge joint treatment technology |
| CN113325122A (en) * | 2021-05-20 | 2021-08-31 | 南开大学 | Method for determining organic pollutants enriched by colloid components in site-contaminated soil |
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Application publication date: 20130911 |