CN105036518A - Deep dehydration method for excess sludge of urban sewage plant - Google Patents

Deep dehydration method for excess sludge of urban sewage plant Download PDF

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Publication number
CN105036518A
CN105036518A CN201510478952.9A CN201510478952A CN105036518A CN 105036518 A CN105036518 A CN 105036518A CN 201510478952 A CN201510478952 A CN 201510478952A CN 105036518 A CN105036518 A CN 105036518A
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China
Prior art keywords
dehydration
sludge
mud
deep dehydration
water ratio
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CN201510478952.9A
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Chinese (zh)
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温磊
陈思
万春黎
王利
刘翔
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Fudan University
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Fudan University
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Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to a deep dehydration method for excess sludge of an urban sewage plant. Concentrated sludge (water content ranging from 90% to 99%) at the bottom of a secondary sedimentation tank of the urban sewage plant and preliminarily-dehydrated sludge (water content ranging from 75% to 85%) obtained after mechanical dehydration are regarded as objects, formaldehyde or ethanol or acetone or normal butanol with the concentration ranging from 30% to 100% is adopted as a dehydration agent, and pretreatment is performed; then, deep dehydration is performed through natural drying or vacuum filtration or cyclic heating under an indoor temperature till the water content is not changed. Results indicate that the higher the concentration of the dehydration agent is, the lower the water content of a treated sludge sample will be; as for the dehydration effect of the dehydration agent, formaldehyde>acetone>ethanol>normal butanol; after dehydration, the minimum water content of the concentrated sludge is 12.2+/-2.6% (100% formaldehyde + vacuum filtration), and the minimum water content of the preliminarily-dehydrated sludge is 16.8+/-2.1% (100% formaldehyde + cyclic heating).

Description

A kind of deep dehydration method of municipal effluent plant excess sludge
Technical field
The invention belongs to environmental technology field, be specifically related to a kind of dewatering of municipal effluent plant excess sludge.
Background technology
At present, the technique of China's urban wastewater treatment facility, still based on biological process, can produce a large amount of excess sludges in the process of process waste water.Not only containing a large amount of moisture in mud, but also containing hazardous and noxious substances such as organic pollutant, pathogenic bacteria and heavy metals, if can not get appropriate disposal, secondary environmental pollution problem that will be serious.Therefore, pay close attention to the disposal of mud, become very urgent.
Because the water ratio of excess sludge is high, volume large, therefore, before mud is disposed, the volume reducing mud as much as possible first must be dewatered, thus the transport reduced subsequently and process disposal costs.In each stage of sewage disposal, all can produce a large amount of mud of different nature, the water ratio of these mud is usually between 95-99.9%, bulky.Dispose for ease of follow-up process, most of sewage work is all provided with sludge concentration and dewatering facility, and conventional dewatering comprises: mechanical dehydration, natural mummification, freezing-dissolving technology and heat drying technology etc.Wherein, mechanical dehydration technology comprises filter press, belt press filtration, vacuum filtration and centrifuge dehydration etc., the method is mainly through applying certain mechanical pressure to mud, the moisture in mud is made to pass through filtration medium, mud granule is then trapped, therefore achieve the separation of muddy water in mud, dehydrated sludge water ratio is usually between 75-85%.Secondly, though natural mummification, freezing-dissolve and heat drying technology by near for excess sludge water ratio less than 60%, even can reach 30%, but affect larger by extraneous factors such as weather, and expense of labor or energy consumption also higher.
Along with the promulgation of sludge disposal national standard, to needing, the requirement of the character such as the water ratio of disposing sludge is also more and more higher, so must carry out deep dehydration to the mud after mechanical dehydration, makes the water ratio of mud be reduced to less than 60%.Therefore, need to develop a kind of suitable dehydration technique, effectively deep dehydration can be carried out to mud when reducing investment outlay.
Summary of the invention
The present invention aims to provide a kind of method that is novel, municipal effluent plant excess sludge dehydration efficiently, so as when reduce investment outlay and manpower effectively deep dehydration (water ratio is lower than 50%) is carried out to mud.
The invention provides the deep dehydration method of municipal effluent plant excess sludge, concrete steps are as follows:
(1) first, get two kinds of excess sludges of municipal sewage plant, be respectively thickened sludge in second pond sludge bucket, water ratio scope is at 90-99%; Preliminary hydro-extraction mud after mechanical dehydration, water ratio scope is between 75-85%;
(2) then, respectively to second pond thickened sludge and preliminary hydro-extraction mud, carry out pre-treatment by organic solution, the solvent of described organic solution is selected from formaldehyde, acetone, ethanol and propyl carbinol, and concentration of organic solution is 30-100%;
(3) last, pretreated excess sludge is carried out natural drying or vacuum filtration under room temperature condition (25 ± 3 DEG C), or utilizes hydronic mode, carry out deep dehydration, till moisture percentage in sewage sludge no longer changes.
In the present invention, described pretreated step is: first, and configuration concentration is the formaldehyde of 30-100%, ethanol, acetone or butanol solution respectively, and organic solution 100mL is loaded in container (as triangular flask); Then, get mud after 30 ± 5g second pond thickened sludge and mechanical dehydration respectively, be respectively charged into and be placed with in the organic solution container of above-mentioned different concns, under room temperature condition (25 ± 3 DEG C), be placed in shaking table, under 120 ± 5rpm condition, mix 30-40min.
In the present invention, under described room temperature condition (25 ± 3 DEG C), the concrete steps of natural drying dehydration are:
Mud mixed liquid after adopting qualitative filter paper to filter mixing, after having filtered, shakeout by mud sample, airing under room temperature condition (25 ± 3 DEG C), until water ratio no longer changes namely complete deep dehydration process.
In the present invention, under described room temperature condition, the concrete steps of (25 ± 3 DEG C) vacuum filtration dehydration are:
Mud mixed liquid is poured in Vacuum filtration device, under 100-400mmHg pressure, carry out vacuum filtration under room temperature condition (25 ± 3 DEG C), until water ratio no longer changes namely complete deep dehydration process.
In the present invention, the described concrete steps of circulating-heating mode deep dehydration that utilize are:
Mud mixed liquid after adopting qualitative filter paper to filter mixing, after having filtered, shakeouts mud sample, is placed in constant temperature at 65-120 DEG C of mummification case, until water ratio no longer changes namely complete deep dehydration process.
The inventive method when reducing investment outlay with manpower, can carry out deep dehydration (water ratio is lower than 50%) to mud efficiently.
Embodiment
The present invention is with two kinds of difference mud to be drained off for research object, and to be respectively in second pond sludge bucket mud after thickened sludge and mechanical dehydration, its water ratio scope is respectively 90-99% and 75-85%.Below by specific embodiment, further describe the present invention.
embodiment 1:
Get 30mL, 50mL, 70mL formaldehyde, ethanol, acetone and propyl carbinol respectively, with 70mL, 50mL, 30mL pure water mixed configuration concentration be 30%, 50%, 70% formaldehyde, ethanol, acetone and butanol solution, separately get each solution for standby that 100mL concentration is 100%, and above-mentioned solution 100mL is loaded in 250mL triangular flask.
After getting 30 ± 5g second pond thickened sludge and mechanical dehydration respectively, mud loads in the organic solution of different concns, is placed in shaking table, mixes 30min under 120 ± 5rpm condition under room temperature condition (25 ± 3 DEG C);
Mud mixed liquid after adopting qualitative filter paper to filter mixing, after having filtered, shakeout by mud sample, airing under room temperature condition (25 ± 3 DEG C), until water ratio no longer changes namely complete deep dehydration process.
Result shows, dewatering agent concentration is higher, the water ratio of dehydrated sludge sample is lower, and namely deep dehydration effect is better, and dewatering agent dehydrating effect is followed successively by simultaneously: formaldehyde > acetone > ethanol > propyl carbinol.Wherein, for second pond thickened sludge, after 100% formaldehyde, ethanol, acetone and propyl carbinol process, dehydrated sludge water ratio is: 17.2 ± 2.5%, 22.3 ± 2.4%, 31.1 ± 2.2%, 49.7 ± 1.5%; For preliminary hydro-extraction mud, after 100% formaldehyde, ethanol, acetone and propyl carbinol process, dehydrated sludge water ratio is: 20.3 ± 1.5%, 25.8 ± 2.7%, 29.7 ± 1.6%, 46.2 ± 1.6%.
embodiment 2:
Get 30mL, 50mL, 70mL formaldehyde, ethanol, acetone and propyl carbinol respectively, with 70mL, 50mL, 30mL pure water mixed configuration concentration be 30%, 50%, 70% formaldehyde, ethanol, acetone and butanol solution, separately get each solution for standby that 100mL concentration is 100%, and above-mentioned solution 100mL is loaded in 250mL triangular flask.
After getting 30 ± 5g second pond thickened sludge and mechanical dehydration respectively, mud loads in the organic solution of different concns, is placed in shaking table, mixes 30min under 120 ± 5rpm condition under room temperature condition (25 ± 3 DEG C);
0.45 μm of filter membrane is put into Vacuum filtration device, then mud mixed liquid is poured in device, under 100-400mmHg pressure, carry out vacuum filtration under room temperature condition (25 ± 3 DEG C), until water ratio no longer changes namely complete deep dehydration process.
Result shows, dewatering agent concentration is higher, the water ratio of dehydrated sludge sample is lower, and namely deep dehydration effect is better, and dewatering agent dehydrating effect is followed successively by simultaneously: formaldehyde > acetone > ethanol > propyl carbinol.Wherein, for second pond thickened sludge, after 100% formaldehyde, ethanol, acetone and propyl carbinol process, dehydrated sludge water ratio is: 12.2 ± 2.6%, 16.3 ± 2.0%, 21.1 ± 1.2%, 22.7 ± 1.5%; For preliminary hydro-extraction mud, after 100% formaldehyde, ethanol, acetone and propyl carbinol process, dehydrated sludge water ratio is: 17.4 ± 1.7%, 21.7 ± 1.6%, 27.7 ± 2.4%, 28.9 ± 0.9%.
embodiment 3:
Get 30mL, 50mL, 70mL formaldehyde, ethanol, acetone and propyl carbinol respectively, with 70mL, 50mL, 30mL pure water mixed configuration concentration be 30%, 50%, 70% formaldehyde, ethanol, acetone and butanol solution, separately get each solution for standby that 100mL concentration is 100%, and above-mentioned solution 100mL is loaded in 250mL triangular flask.
After getting 30 ± 5g second pond thickened sludge and mechanical dehydration respectively, mud loads in the organic solution of different concns, is placed in shaking table, mixes 30min under 120 ± 5rpm condition under room temperature condition (25 ± 3 DEG C);
Mud mixed liquid after adopting qualitative filter paper to filter mixing, after having filtered, shakeouts mud sample, is placed in constant temperature respectively at 65,80,120 DEG C of mummification casees, until water ratio no longer changes namely complete deep dehydration process.
Result shows, dewatering agent concentration is higher, the water ratio of dehydrated sludge sample is lower, and namely deep dehydration effect is better, and dewatering agent dehydrating effect is followed successively by simultaneously: formaldehyde > acetone > ethanol > propyl carbinol.Wherein, for second pond thickened sludge, after 100% formaldehyde, ethanol, acetone and propyl carbinol process, dehydrated sludge water ratio is: 13.2 ± 1.5%, 15.3 ± 2.0%, 20.1 ± 2.1%, 29.7 ± 1.6%; For preliminary hydro-extraction mud, after 100% formaldehyde, ethanol, acetone and propyl carbinol process, dehydrated sludge water ratio is: 16.8 ± 2.1%, 20.1 ± 0.9%, 24.7 ± 1.4%, 28.1 ± 1.4%.
Table 1 is that in embodiment 1, after different pretreatments, excess sludge dries the front/rear water ratio of dehydration naturally through room temperature.
Table 2 to dewater front/rear water ratio through room temperature in vacuo for excess sludge after different pretreatments in embodiment 2.
Table 3 to dewater front/rear water ratio through circulating-heating for excess sludge after different pretreatments in embodiment 3.
After table 1 different pretreatments, excess sludge dries the front/rear water ratio of dehydration naturally through room temperature
After table 2 different pretreatments, excess sludge to dewater front/rear water ratio through room temperature in vacuo
After table 3 different pretreatments, excess sludge to dewater front/rear water ratio through circulating-heating

Claims (5)

1. a deep dehydration method for municipal effluent plant excess sludge, is characterized in that concrete steps are as follows:
(1) first, get two kinds of excess sludges of municipal sewage plant, be respectively thickened sludge in second pond sludge bucket, water ratio scope is at 90-99%; Preliminary hydro-extraction mud after mechanical dehydration, water ratio scope is between 75-85%;
(2) then, respectively to second pond thickened sludge and preliminary hydro-extraction mud, carry out pre-treatment by organic solution, the solvent of described organic solution is selected from formaldehyde, acetone, ethanol and propyl carbinol, and concentration of organic solution is 30-100%;
(3) last, pretreated excess sludge is carried out natural drying or vacuum filtration under room temperature condition, or utilizes hydronic mode, carry out deep dehydration, till moisture percentage in sewage sludge no longer changes.
2. the deep dehydration method of municipal effluent plant excess sludge according to claim 1, it is characterized in that described pretreated step is: first, configuration concentration is the formaldehyde of 30-100%, ethanol, acetone or butanol solution respectively, and organic solution 100mL is loaded in container; Then, get mud after 30 ± 5g second pond thickened sludge and mechanical dehydration respectively, be respectively charged into and be placed with in the organic solution container of above-mentioned different concns, under room temperature condition, be placed in shaking table, under 120 ± 5rpm condition, mix 30-40min.
3. the deep dehydration method of municipal effluent plant excess sludge according to claim 2, is characterized in that the concrete steps of natural drying dehydration under described room temperature condition are:
Mud mixed liquid after adopting qualitative filter paper to filter mixing, after having filtered, shakeouts mud sample, airing under room temperature condition, until water ratio no longer changes namely complete deep dehydration process.
4. the deep dehydration method of municipal effluent plant excess sludge according to claim 2, is characterized in that the concrete steps of vacuum filtration dehydration under described room temperature condition are:
Mud mixed liquid is poured in Vacuum filtration device, under room temperature condition, under 100-400mmHg pressure, carry out vacuum filtration, until water ratio no longer changes namely complete deep dehydration process.
5. the deep dehydration method of municipal effluent plant excess sludge according to claim 2, is characterized in that the described concrete steps of circulating-heating mode deep dehydration that utilize are:
Mud mixed liquid after adopting qualitative filter paper to filter mixing, after having filtered, shakeouts mud sample, is placed in constant temperature at 65-120 DEG C of mummification case, until water ratio no longer changes namely complete deep dehydration process.
CN201510478952.9A 2015-08-03 2015-08-03 Deep dehydration method for excess sludge of urban sewage plant Pending CN105036518A (en)

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Publication number Priority date Publication date Assignee Title
CN106082575A (en) * 2016-08-05 2016-11-09 湖南警察学院 A kind of method utilizing sludge dewatering pyrolytic gasification to generate electricity
WO2019201313A1 (en) * 2018-04-19 2019-10-24 北京中科国通环保工程技术股份有限公司 Method and device for treating aqueous substance
CN114044640A (en) * 2021-10-28 2022-02-15 嘉兴绿方舟环保技术有限公司 Double-component sludge-based non-fired cementing material and preparation method and application thereof

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Publication number Priority date Publication date Assignee Title
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CN114044640A (en) * 2021-10-28 2022-02-15 嘉兴绿方舟环保技术有限公司 Double-component sludge-based non-fired cementing material and preparation method and application thereof

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