CN105254149A - Recycling technology for sludge generated after sewage treatment - Google Patents
Recycling technology for sludge generated after sewage treatment Download PDFInfo
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- CN105254149A CN105254149A CN201510710211.9A CN201510710211A CN105254149A CN 105254149 A CN105254149 A CN 105254149A CN 201510710211 A CN201510710211 A CN 201510710211A CN 105254149 A CN105254149 A CN 105254149A
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Abstract
The invention relates to a recycling technology for sludge generated after sewage treatment. The recycling technology includes the concrete steps of concentration, flocculation treatment, mechanical dehydration, deep dehydration, anaerobic digestion, marsh gas collection, purification and depuration, sludge heat drying, land utilization, building material utilization, other aspects of utilization and the like. Sludge stabilization, reduction and harmlessness are achieved, and finally the resource recycling effect is achieved.
Description
Technical field
The present invention relates to a kind of integrated wastewater treatment technology, particularly relate to a kind of sewage sludge after sewage treatment recycle utilization.
Background technology
According to statistics, current municipal sewage plant of China discharges about 300,000 tons of dewatered sludges every year, and with about 10% speed increment.The composition of mud is very complicated, be a kind of extremely complicated heterogeneous body be made up of organic relic, microorganism, inorganic particle, colloid etc., except containing a large amount of moisture, also have the organism of difficult degradation, heavy metal, salt and pathogenic micro-organism and parasite, ovum etc.Mud likely can bring following several respects to endanger if do not carried out effective disposal: pathogen contamination, excessive salt pollute, excessive nitrogen and phosphorus pollution, organic polymer pollute and heavy metal contamination.These pollutions finally can affect water body and soil, injury root system of plant, easily accumulation toxicity in crop and animal and human body, contaminate environment etc.Sludge problem has become the current overall situation problem affecting urban development as can be seen here, and properly process and disposing sludge seem particularly necessary.
" ten, water " that State Council issues proposes, and existing sludge treatment facilities should substantially complete transformation up to standard before the end of the year 2017, and region and above municipal sludge harmless treatment disposal rate should reach more than 90% before the year two thousand twenty end of the year.This to have tied tight the halter rope of sludge treatment from policy angle.
The present invention, by a kind of sewage sludge after sewage treatment recycle utilization of research, achieves the stabilization of mud, minimizing and innoxious, and finally reaches the effect of resource circulation utilization.
Summary of the invention
The present invention relates to a kind of sewage sludge after sewage treatment recycle utilization, specifically comprise the steps:
(1) concentrated: by the sludge slurry from sewage work, use centrifugal concentrating method to make sludge moisture content be down to 94% ~ 96% by 99.2% ~ 99.5%;
(2) flocculation treatment: add diatomite and microbial flocculant (MBF), the composite mass ratio of diatomite and MBF is 5:1 ~ 40:1, drop into unslaked lime again, be deployed into the calcium carbonate modified diatomite containing mass percent 25 ~ 35%, composite good modification infusorial earth is thrown in the ratio of 10-50kg with every cubic metre of mud, put into sludge slurry, the heavy metal in absorption mud, control moisture percentage in sewage sludge and reach less than 60%;
(3) mechanical dehydration: use mechanical dehydration after being stirred by the sludge slurry after process, make sludge water content by filtering net, pressure filtration, solid particulate is trapped within medium, forms filter cake, collects filtrate and is placed in heatproof reactor;
(4) deep dehydration: add the TS proteolytic enzyme of 25mg/g, 0.2g/g EDTA-2Na salt at 100-120 DEG C, the cell of mud and colloidal structure are destroyed, reduce moisture binding capacity and the compressibility of mud, carry out deep dehydration, make moisture percentage in sewage sludge reach less than 30%;
(5) anaerobic digestion: at 155 DEG C ~ 170 DEG C, under 6bar pressure, thermal hydrolysis and flash distillation process are carried out to mud, extracellular polymeric in mud and larger molecular organics are hydrolyzed again, microbial cell wall in breaking sludge again, the biodegradability energy of strengthening material, improve the mobility of material, improve the capacity utilization in anaerobic sludge digestion pond, the degradation effect of organic compound of anaerobic digestion and biogas output, reach sludge reduction, stabilization, innoxious effect simultaneously.
(6) collection of biogas, purification, purifying: the collecting methane that anaerobic digestion produces is got up, after desulfurization purification processes, makes the Sweet natural gas that methane concentration reaches more than 90%.
(7) sludge heat drying: adopt fluidized-bed drying process, utilize the biogas thermal source after purifying, indirect heating, temperature is 180 DEG C ~ 220 DEG C, utilize high temperature again to remove pathogenic agent, parasitic ovum mud in mud, and be mixed into filter cake pulverize after powder, make mud absolutely dryization or semi-oriented, the mud granule distribution uniform of the finished product, diameter 1 ~ 5mm;
(8) Land_use change: by the mud after innoxious and stabilization treatment and sludge product, compositely add adequate nutrition element, the aspects such as agricultural, forestry, afforestation and soil improvement are used for forms such as fertilizer, matrix, vegetable mould, Nutrition Soils, the nutritional resource such as the organic matter in mud and nitrogen phosphorus is fully utilized, and mud also can be able to effective disposal simultaneously;
(9) building materials utilize: for the excess sludge not reaching Land_use change standard, and drop into the unslaked lime within mud weight 30%, blending even with mud, the mud after lime stabilization, high temperature incineration, passivation curing heavy metal ion, obtains grog.Reach national building standard, to be after levigate " cement ".
(10) other utilize: the powder of substandard serious pollution after testing carries out burning disposal, to lime-ash and the flying dust of Hazardous wastes, should include dangerous solid waste management in, give landfill.
Beneficial effect of the present invention:
The present invention have studied a kind of sewage sludge after sewage treatment recycle utilization, achieves the stabilization of mud, minimizing and innoxious, and finally reaches the effect of resource circulation utilization; And sludge circulation of the present invention utilizes technology sludge disposal cost low, good in economic efficiency, can not produce secondary pollution.
Accompanying drawing explanation
Fig. 1 is sewage sludge after sewage treatment recycle utilization route map of the present invention
Embodiment
Embodiment 1:
A kind of sewage sludge after sewage treatment recycle utilization, specifically comprise the steps: to concentrate: use centrifugal concentrating method to make sludge moisture content be down to 94% by 99.2% ~ 99.5%, add diatomite, microbial flocculant (MBF), the composite mass ratio of diatomite and MBF is 50:1, drop into certain proportion unslaked lime again, be deployed into the calcium carbonate modified diatomite containing 35%, after conditioning, use mechanical dehydration, make sludge water content be forced through filtration medium, form filtrate, solid particulate is trapped within medium afterwards, forms filter cake; Add 25mg/gTS proteolytic enzyme, 0.2g/gTS concentration EDTA-2Na salt at 100 DEG C, the cell of mud and colloidal structure are destroyed, reduce moisture binding capacity and the compressibility of mud, carry out deep dehydration, make moisture percentage in sewage sludge reach less than 30%; 155 DEG C, thermal hydrolysis and flash distillation process are carried out to mud under 6bar air pressure, the collecting methane that anaerobic digestion produces is got up, after desulfurization purification processes, makes the Sweet natural gas that methane concentration reaches more than 90% ~ 95%; Adopt fluidized-bed drying process, utilize the biogas thermal source after purifying, indirect heating fluidized-bed temperature reaches 180 DEG C, makes mud absolutely dryization or semi-oriented, gained mud granule diameter 1 ~ 5mm; By the mud after innoxious and stabilization treatment and sludge product, after composite appropriate n p k nutrition element, for agricultural fertilizer.
Embodiment 2:
A kind of sewage sludge after sewage treatment recycle utilization, specifically comprise the steps: to concentrate: use centrifugal concentrating method to make sludge moisture content be down to 94% by 99.2% ~ 99.5%, add diatomite, microbial flocculant (MBF), the composite mass ratio of diatomite and MBF is 30:1, drop into certain proportion unslaked lime again, be deployed into the calcium carbonate modified diatomite containing 25%, after conditioning, use mechanical dehydration, make sludge water content be forced through filtration medium, form filtrate, solid particulate is trapped within medium afterwards, forms filter cake; Add 25mg/gTS proteolytic enzyme, 0.2g/gTS concentration EDTA-2Na salt at 110 DEG C, the cell of mud and colloidal structure are destroyed, reduce moisture binding capacity and the compressibility of mud, carry out deep dehydration, make moisture percentage in sewage sludge reach less than 30%; 165 DEG C, thermal hydrolysis and flash distillation process are carried out to mud under 6bar air pressure, the collecting methane that anaerobic digestion produces is got up, after desulfurization purification processes, makes the Sweet natural gas that methane concentration reaches more than 90% ~ 95%; Adopt fluidized-bed drying process, utilize the biogas thermal source after purifying, indirect heating fluidized-bed temperature reaches 180 DEG C, makes mud absolutely dryization or semi-oriented, gained mud granule diameter 1 ~ 5mm; By the mud after innoxious and stabilization treatment and sludge product, drop into the unslaked lime within mud weight 30%, even blending, the mud after lime stabilization, high temperature incineration, obtains grog, reaches national building standard, is " cement " after levigate.
Embodiment 3:
A kind of sewage sludge after sewage treatment recycle utilization, specifically comprise the steps: to concentrate: use centrifugal concentrating method to make sludge moisture content be down to 94% by 99.2% ~ 99.5%, add diatomite, microbial flocculant (MBF), the composite mass ratio of diatomite and MBF is 5:1, drop into certain proportion unslaked lime again, be deployed into the calcium carbonate modified diatomite containing 25%, after conditioning, use mechanical dehydration, make sludge water content be forced through filtration medium, form filtrate, solid particulate is trapped within medium afterwards, forms filter cake; Add 25mg/gTS proteolytic enzyme, 0.2g/gTS concentration EDTA-2Na salt at 120 DEG C, the cell of mud and colloidal structure are destroyed, reduce moisture binding capacity and the compressibility of mud, carry out deep dehydration, make moisture percentage in sewage sludge reach less than 20%; 170 DEG C, thermal hydrolysis and flash distillation process are carried out to mud under 6bar air pressure, the collecting methane that anaerobic digestion produces is got up, after desulfurization purification processes, makes the Sweet natural gas that methane concentration reaches more than 90% ~ 95%; Adopt fluidized-bed drying process, utilize the biogas thermal source after purifying, indirect heating fluidized-bed temperature reaches 180 DEG C, makes mud absolutely dryization or semi-oriented, gained mud granule diameter 1 ~ 5mm; By the mud after innoxious and stabilization treatment and sludge product, after composite appropriate n p k nutrition element, for agricultural fertilizer.
Embodiment 4
A kind of sewage sludge after sewage treatment recycle utilization, specifically comprise the steps: to concentrate: use centrifugal concentrating method to make sludge moisture content be down to 94% by 99.2% ~ 99.5%, add diatomite, microbial flocculant (MBF), the composite mass ratio of diatomite and MBF is 10:1, drop into certain proportion unslaked lime again, be deployed into the calcium carbonate modified diatomite containing 25%, after conditioning, use mechanical dehydration, make sludge water content be forced through filtration medium, form filtrate, solid particulate is trapped within medium afterwards, forms filter cake; Add 25mg/gTS proteolytic enzyme, 0.2g/gTS concentration EDTA-2Na salt at 110 DEG C, the cell of mud and colloidal structure are destroyed, reduce moisture binding capacity and the compressibility of mud, carry out deep dehydration, make moisture percentage in sewage sludge reach less than 30%; 170 DEG C, thermal hydrolysis and flash distillation process are carried out to mud under 6bar air pressure, the collecting methane that anaerobic digestion produces is got up, after desulfurization purification processes, makes the Sweet natural gas that methane concentration reaches more than 90% ~ 95%; Adopt fluidized-bed drying process, utilize the biogas thermal source after purifying, indirect heating fluidized-bed temperature reaches 180 DEG C, makes mud absolutely dryization or semi-oriented, gained mud granule diameter 1 ~ 3mm; By the mud after innoxious and stabilization treatment and sludge product, after composite appropriate n p k nutrition element, for agricultural fertilizer, for the excess sludge not reaching Land_use change standard, drop into the unslaked lime within mud weight 30%, even blending, mud after lime stabilization, high temperature incineration, obtains grog, reaches national building standard, be after levigate " cement ", what do not reach building standard after burning carries out landfill, residue is belonged to lime-ash and the flying dust of Hazardous wastes, should include dangerous solid waste management in.
Claims (5)
1. a sewage sludge after sewage treatment utilization process, specifically comprises the steps:
(1) concentrated: by the sludge slurry from sewage work, use centrifugal concentrating method to make sludge moisture content be down to 94% ~ 96% by 99.2% ~ 99.5%;
(2) flocculation treatment: add diatomite, microbial flocculant and unslaked lime and make modification infusorial earth, modification infusorial earth puts into sludge slurry, the heavy metal in absorption mud, controls moisture percentage in sewage sludge and reaches less than 60%;
(3) mechanical dehydration: use mechanical dehydration after being stirred by the sludge slurry after process, make sludge water content by filtering net, pressure filtration, solid particulate is trapped within medium, forms filter cake, collects filtrate and is placed in heatproof reactor;
(4) deep dehydration: add TS proteolytic enzyme and EDTA-2Na salt, at 100-120 DEG C, destroys the cell of mud and colloidal structure, reduces moisture binding capacity and the compressibility of mud, carries out deep dehydration, make moisture percentage in sewage sludge reach less than 30%;
(5) anaerobic digestion: carry out thermal hydrolysis and flash distillation process to mud, makes the extracellular polymeric in mud and larger molecular organics again be hydrolyzed, microbial cell wall in breaking sludge again.
(6) collection of biogas, purification, purifying: the collecting methane that anaerobic digestion produces is got up, after desulfurization purification processes, makes the Sweet natural gas that methane concentration reaches more than 90%.
(7) sludge heat drying: adopt fluidized-bed drying process, utilize the biogas thermal source after purifying, indirect heating fluidized-bed, high temperature is utilized again to remove pathogenic agent, parasitic ovum mud in mud, and powder after being mixed into filter cake pulverizing, make mud absolutely dryization or semi-oriented, the mud granule distribution uniform of the finished product;
(8) Land_use change: by the mud after innoxious and stabilization treatment and sludge product, compositely add adequate nutrition element, the aspects such as agricultural, forestry, afforestation and soil improvement are used for forms such as fertilizer, matrix, vegetable mould, Nutrition Soils, the nutritional resource such as the organic matter in mud and nitrogen phosphorus is fully utilized, and mud also can be able to effective disposal simultaneously;
(9) building materials utilize: for the excess sludge not reaching Land_use change standard, and drop into the unslaked lime within mud weight 30%, blending even with mud, the mud after lime stabilization, high temperature incineration, passivation curing heavy metal ion, obtains grog.Reach national building standard, to be after levigate " cement ";
(10) other utilize: the powder of substandard serious pollution after testing carries out burning disposal, to lime-ash and the flying dust of Hazardous wastes, should include dangerous solid waste management in, give landfill.
2. technique according to claim 1, it is characterized in that: in described step (2) flocculation treatment step, the composite mass ratio of diatomite and microbial flocculant MBF is 5:1 ~ 40:1, drop into unslaked lime again, be deployed into the calcium carbonate modified diatomite containing mass percent 25 ~ 35%, composite good modification infusorial earth thrown in the ratio of 10-50kg with every cubic metre of mud, put into sludge slurry, heavy metal in absorption mud, controls moisture percentage in sewage sludge and reaches less than 60%.
3. technique according to claim 1, is characterized in that: in described step (4), add the TS proteolytic enzyme of 25mg/g, 0.2g/g EDTA-2Na salt at 100-120 DEG C.
4. technique according to claim 1, is characterized in that: described step (5), at 155 DEG C ~ 170 DEG C, carries out thermal hydrolysis and flash distillation process under 6bar pressure to mud.
5. technique according to claim 1, it is characterized in that: described step (7) concrete technology is the biogas thermal source after utilizing purifying, indirect heating, temperature is 180 DEG C ~ 220 DEG C, utilize high temperature again to remove pathogenic agent, parasitic ovum mud in mud, and be mixed into filter cake pulverize after powder, make mud absolutely dryization or semi-oriented, the mud granule distribution uniform of the finished product, diameter 1 ~ 5mm.
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| CN201510710211.9A CN105254149A (en) | 2015-10-28 | 2015-10-28 | Recycling technology for sludge generated after sewage treatment |
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Cited By (9)
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| CN107265798A (en) * | 2017-06-29 | 2017-10-20 | 山东毅康科技股份有限公司 | A kind of method for sludge treatment |
| CN107382005A (en) * | 2017-09-22 | 2017-11-24 | 北京高能时代环境技术股份有限公司 | The processing system and method for a kind of sludge |
| CN107473542A (en) * | 2017-07-31 | 2017-12-15 | 江苏天诺环境工程技术开发有限公司 | A kind of sludge treatment technique |
| CN109081537A (en) * | 2018-06-21 | 2018-12-25 | 惠州市东江园林工程有限公司 | A kind of Environmental-protection recycling sludge treatment system |
| CN110746061A (en) * | 2019-10-30 | 2020-02-04 | 方小兵 | Sludge treatment method |
| CN111056699A (en) * | 2019-12-05 | 2020-04-24 | 广州盈德建筑工程有限公司 | New sewage treatment technology |
| CN112062430A (en) * | 2020-09-09 | 2020-12-11 | 樊晓瑜 | Sludge heavy metal treatment system |
| CN113562826A (en) * | 2021-08-02 | 2021-10-29 | 浙江众华家纺集团有限公司 | Printing and dyeing wastewater recovery device and waste treatment method thereof |
| CN117185612A (en) * | 2023-08-30 | 2023-12-08 | 北京大学 | Sludge dewatering reuse self-adaptive intelligent treatment system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107265798A (en) * | 2017-06-29 | 2017-10-20 | 山东毅康科技股份有限公司 | A kind of method for sludge treatment |
| CN107473542A (en) * | 2017-07-31 | 2017-12-15 | 江苏天诺环境工程技术开发有限公司 | A kind of sludge treatment technique |
| CN107382005A (en) * | 2017-09-22 | 2017-11-24 | 北京高能时代环境技术股份有限公司 | The processing system and method for a kind of sludge |
| CN109081537A (en) * | 2018-06-21 | 2018-12-25 | 惠州市东江园林工程有限公司 | A kind of Environmental-protection recycling sludge treatment system |
| CN110746061A (en) * | 2019-10-30 | 2020-02-04 | 方小兵 | Sludge treatment method |
| CN111056699A (en) * | 2019-12-05 | 2020-04-24 | 广州盈德建筑工程有限公司 | New sewage treatment technology |
| CN112062430A (en) * | 2020-09-09 | 2020-12-11 | 樊晓瑜 | Sludge heavy metal treatment system |
| CN112062430B (en) * | 2020-09-09 | 2022-04-26 | 樊晓瑜 | Sludge heavy metal treatment system |
| CN113562826A (en) * | 2021-08-02 | 2021-10-29 | 浙江众华家纺集团有限公司 | Printing and dyeing wastewater recovery device and waste treatment method thereof |
| CN117185612A (en) * | 2023-08-30 | 2023-12-08 | 北京大学 | Sludge dewatering reuse self-adaptive intelligent treatment system |
| CN117185612B (en) * | 2023-08-30 | 2024-07-12 | 北京大学 | Sludge dewatering reuse self-adaptive intelligent treatment system |
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