CN102167490A - Integrated treatment method for thickening, drying and purifying municipal sludge - Google Patents
Integrated treatment method for thickening, drying and purifying municipal sludge Download PDFInfo
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- CN102167490A CN102167490A CN2011101323976A CN201110132397A CN102167490A CN 102167490 A CN102167490 A CN 102167490A CN 2011101323976 A CN2011101323976 A CN 2011101323976A CN 201110132397 A CN201110132397 A CN 201110132397A CN 102167490 A CN102167490 A CN 102167490A
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Abstract
The invention discloses an integrated treatment method for thickening, drying and purifying municipal sludge. The method comprises the steps as follows: the municipal sludge is concentrated in a sludge concentrating pool, and the concentrated submerged sludge is transported into a decanter centrifuge; a polyacrylamide cationic flocculating agent in a medicine adding box is added into the decanter centrifuge, wherein 2-3g of polyacrylamide is added into each kilogram of the submerged dried sludge, and solid particles in the submerged sludge are bonded together to form a plurality of particle groups, so that solid is separated from liquid to form a supernate and a mud cake; the mud cake is transported into a sludge treating place by a shaftless screw conveyer, and the supernate is transported to a sludge concentrating pool through a clear liquor pipeline by a water pump in a reflowing way; the supernate in the sludge concentrating pool is transported to the bottom of a filter by an overflowing groove through a pipeline; and the solid is separated from the liquid due to the centrifugal precipitation principle of the decanter centrifuge, the sludge with different charging concentrations is treated by less flocculating agent, and the physical filtering function and the physical absorbing function of the filler are abundantly acted, so that the municipal sludge and the wastewater produced by the municipal sludge can be synchronously treated.
Description
Technical field
The present invention relates to the environmental protection industry (epi) municipal sludge and administer technical field, be specifically related to a kind of municipal sludge thickening, mummification, purification of water quality integral type technology.
Background technology
In recent years, along with developing rapidly of municipal sewage treatment industry, the municipal sludge total amount increases progressively with annual 10% speed.Constantly the cumulative municipal sludge not only takies a large amount of soils, and contained various hazardous and noxious substances such as serious threats such as heavy metal, organic pollutant, pathogenic bacteria, parasitic ovum and foul smell in the mud The Surroundings in Cities constitute with ecological, therefore must reasonably dispose municipal sludge.Conventional at present municipal sludge disposing technique flow process is divided into four-stage, and promptly mud concentrates → sludge digestion → sludge dewatering → sludge disposal, makes mud reach minimizing, stabilization, innoxious and resource utilization after treatment.
The mud concentration technology is one of important step of handling of municipal sludge, and its purpose mainly is for the volume that reduces mud, alleviates the pressure of follow-up structures or processing unit, and its main method has that gravity concentrates, air supporting concentrates and machinery concentrates etc.Gravity concentrates has advantages such as Technology, structure and operational management be simple, be the disclosed gravity concentration technology of patent of invention of CN 1179898C as patent publication No., but its floor space is big, sanitary condition is relatively poor; Air supporting concentrates that to have floor space little, can prevent that mud releases advantages such as phosphorus, corruption, be the disclosed active sludge concentration method of patent of invention of CN 101117253B as patent publication No., but contain a large amount of bubbles in its mud, influence dewatering efficiency, and needed higher level of management.Machinery concentrates the enriching section generally be used for the sludge concentration and dewatering integration apparatus, characteristics such as have that technical process is simple, adaptability is strong, simple to operate and process controllability is strong.
Contain higher suspended substance in the municipal sludge, because moisture and mud granule bonded characteristic, Sludge Surface has a large amount of surface waters and capillary water, i.e. irreducible water.This class water is adsorbed by the powerful negative charge in periphery or is wrapped in, and adopts traditional dewatering process to handle and has certain restriction, only sloughs the free water of part, and water ratio generally can only be between 70% ~ 80%, is unfavorable for the subsequent disposal utilization of mud.
The mode that traditional municipal sludge is disposed has landfill, burning disposal and water body to dissolve etc.But the transudate of landfill and the gas of generation can destroy environment, polluted air and water source; The heavy metal that produces in De dioxin and the mud during burning disposal can cause secondary pollution to environment; And water body dissolves and easily causes pollution of the sea, do not tackle the problem at its root.Therefore, under the overall background of global resources anxiety, change traditional municipal sludge and handle and utilize mode, reduce the secondary pollution that produces in the municipal sludge treating processes, development recycling sludge, minimizing utilize technology, have become one of problem of environmental protection circle extensive concern.
Summary of the invention
The objective of the invention is that the construction area occupied is big in the existing municipal sludge treatment process, traditional sludge thickening efficient is low and water ratio is high, mechanical dehydration efficient is low and moisture content of the cake is high, easily produce secondary pollution problems in order to solve, a kind of new municipal sludge thickening, mummification, purification of water quality integral type treatment process are provided, make municipal sludge reach effective processing, thereby realization city sewage sludge reclamation, be applied in the sewage treatment process, solve sludge from wastewater treatment plant and handle difficult problem.
Technical scheme of the present invention is to adopt following steps: (1) municipal sludge is promoted to sludge thickener through pump, concentrates in sludge thickener; (2) the sinking mud after concentrating by the sludge thickener bottom by sewage sludge feed pump and pipeline input horizontal screw centrifuge; Polyacrylamide cationic flocculant in the dosing tank drops into horizontal screw centrifuge by the metering of dosing volume pump through described pipeline simultaneously, the polyacrylamide dosage is that the dried mud of per kilogram sinking mud adds 2～3g, the solid particulate bonding forms cluster of grains in the sinking mud, makes solid-liquid separation form supernatant liquor and mud cake; (3) described mud cake is delivered to the sludge disposal place by Shaftless screw conveyor, and described supernatant liquor is refluxed by water pump by the clear liquor pipeline and is delivered in the sludge thickener; (4) supernatant liquor in the sludge thickener by overflow groove by pipe-line transportation to filter bottom.
The invention has the beneficial effects as follows:
1, utilizes horizontal screw centrifuge centrifugal settling principle, make solid-liquid separation, owing to be provided with filter screen, can not cause obstruction, in dehydration when input concentration changes, the slip of rotary drum and spiral and moment of torsion can be from the motion tracking adjustment, so can not establish special messenger operation, in whizzer, tiny mud also can with water sepn, so the dosage of flocculation agent is less, thereby realize adopting less flocculation agent that different feeds concentration mud is handled; And utilize the quartz consumption filtrate of the high interception capacity of filter interior filling to be treatment media simultaneously, give full play to the physisorption of physical filtering effect and filler, realized the synchronous processing of the waste water of municipal sludge and its generation.
2, the supernatant liquor effluent quality reaches the grade III Standard in " urban wastewater treatment firm pollutant emission standard " elementary item target limit value in (GB18918-2002), can be directly as industrial process waters; The mud area reduces, and has realized resource utilization, the minimizing of municipal sludge.
3, the present invention has construction investment province, takes up an area of and lacks, and working cost is low, and sludge drying degree height is directly handled concentrating back supernatant liquor and centrifugal gained filtrate, can be used as the high-quality ecological fertilizer, for new approach has been opened up in the processing of China's sludge from wastewater treatment plant.
Description of drawings
Fig. 1 is municipal sludge thickening, mummification, purification of water quality integral type process flow diagram;
Among the figure: the 1-sludge thickener; The 2-dosing tank; The 3-horizontal screw centrifuge; The 4-strainer.
Embodiment
Referring to Fig. 1, the present invention utilizes 1 pair of municipal sludge of sludge thickener to carry out thickening, mud after the dehydration is through horizontal screw centrifuge 3 centrifugations, further mummification, gained blob of slag water ratio is less than 10%, simultaneously the filtrate that produces after supernatant liquor after the thickening and the centrifugation is carried out filtration treatment, make its qualified discharge, real realization dehydration separates.Sludge thickener 1 bottom is by fresh feed pump and pipe connection horizontal screw centrifuge 3, and the mud cake after horizontal screw centrifuge 3 dehydrations is delivered to the sludge disposal place by Shaftless screw conveyor, and sludge thickener 1 is also by pipe connection strainer 4.Be provided with dosing tank 2 between sludge thickener 1 and horizontal screw centrifuge 3, dosing tank 2 is by the pipeline between volume pump connection sludge thickener 1 and the horizontal screw centrifuge 3.Horizontal screw centrifuge 3 is by the charging input channel of pipe connection sludge thickener 1.
Technical process of the present invention is specific as follows: municipal sludge is promoted to by the charging input channel through pump, enters sludge thickener 1, concentrates in sludge thickener 1.The mud concentration time is not less than 12h in the sludge thickener 1, and sludge loading easily adopts 30～60kg/(m
2D), available depth is preferably 4m.By sewage sludge feed pump and pipeline input horizontal screw centrifuge 3, the sinking sludge quantity is measured by magnetic flow meter sinking mud after concentrating by sludge thickener 1 bottom; The model that horizontal screw centrifuge 3 is selected for use is LW450, commercially available obtaining.Polyacrylamide (PAM) cationic flocculant in the dosing tank 2 is also dropped in this pipeline through the metering of dosing volume pump by dosing tank 2 simultaneously.The polyacrylamide dosage is that the dried mud of the per kilogram of sinking mud adds 2～3g, and whole day 24h moves continuously, the rinse water that do not need in service.Like this, sinking mud and cationic flocculant are sent in the rotary drum inner mixing chamber of horizontal screw centrifuge 3 together, make solid particulate bonding formation cluster of grains in the mud, utilize solid-liquid biphase density difference, and dependence centrifuge field, make solid-liquid separation form mud cake, owing to be provided with filter screen in the rotary drum inner mixing chamber of horizontal screw centrifuge 3, can not cause obstruction, in the dehydration when input concentration changes, the slip of rotary drum and spiral and moment of torsion can be from the motion tracking adjustment, and the mud cake after horizontal screw centrifuge 3 dehydrations is delivered to the sludge disposal place by Shaftless screw conveyor.Supernatant liquor in the horizontal screw centrifuge 3 is then refluxed to be delivered to further to handle in the sludge thickener 1 through sludge thickener 1 and strainer 4 by water pump by the clear liquor pipeline and handles.The mud rate of recovery is more than 95%, and the water ratio of dehydrated sludge is 55%～60%.
Supernatant liquor in the sludge thickener 1 by overflow groove by pipe-line transportation to strainer 4 bottoms, strainer 4 is commercial product, it carries dividing plate, filter core, filter material layer, transmission shaft, electronic residual cake valve and recoil tube etc., the quartz sand filter media of the high interception capacity of inner filling is a treatment media, the filtrate height is 12cm ~ 40cm, the orifice flow of supernatant liquor on dividing plate advances filter material layer, filter material layer is pressed circumference uniform distribution around transmission shaft on dividing plate, supernatant liquor is handled back up to standard discharging, filtering accuracy≤5 μ m through filter 4.The back-flushing method of strainer 4 is: when the resistance of strainer 4 reaches 20cm, electronic residual cake valve is opened, the clear water reverse direction flow on strainer 4 tops is filtered the bed of material, will be along with the solid particulate at the filter material layer inwall is discharged through the deslagging recoil tube, back flushing is under the drive of transmission shaft, pass through each filter material layer position successively, finish backwash process; The impurity such as mud that back flushing comes off are back to sludge thickener 1 with the back flushing water shoot.The filter material layer filling is multi-angular, density is big, the physical strength height, and retaining power is strong, and particle diameter is the quartz sand filter media of 0.5mm ~ 0.8mm, and its specification is that particle diameter is 0.5mm ~ 0.8mm, and tap density is 1.85 g/cm
3, wear rate is 0.3%, and percentage of damage is 0.35%, and porosity is 43%, and the hydrochloric acid soluble rate is 0.02%.Backwashing period is 7d ~ 20d, and backwashing time is 15min, and back washing strength is 4 L/ (m
2S) ~ 15 L/ (m
2S), filtering velocity is 25m/h ~ 30m/h, and backwash swelling rate is 40% ~ 50%, temperature≤95 ℃, and under this processing parameter, its average removal rate to the moisture percentage in sewage sludge in the municipal sludge reaches more than 90%.
Embodiments of the invention below are provided.
Embodiment
It is the municipal sludge of 99.1%-99.6% that present embodiment is handled water ratio, specific embodiment step: at first advance the mud water ratio and be 99.1% ~ 99.6% municipal sludge and handle through sludge thickener 1, concentration time 12h, make its water ratio reduce to 75% ~ 80%, after supernatant liquor filters through filter 4, qualified discharge, mud after the sedimentation mixes in horizontal screw centrifuge 2 rotary drums with flocculation agent by pipeline, dosage adds 2.54 g cationic PAM according to the dried mud of per kilogram, the dispersive mud granule is assembled produced bigger flocs unit, under the centrifugation of horizontal screw centrifuge 2, make mud-water separation, the rotary drum rotating speed is controlled between 2200rpm～2400rpm, keeping under the constant prerequisite of flocculant dosage, by adjusting the rotating speed of mud spiral pump, advance mud according to peak flow, improve differential from low to high gradually, limpid fully until supernatant liquor, supernatant liquor is further handled through pipe-line transportation to sludge thickener 1, mud extraction water ratio after the horizontal helical type centrifugal treating can be reduced to below 10%, and the water outlet suspension content can drop to below the 50mg/L.
Table 1 adopts municipal sludge thickening, mummification, purification of water quality integral type treatment process effect embodiment
| Embodiment | Advance mud water ratio (%) | Mud extraction water ratio (%) | Go out water suspension (mg/L) |
| 1 | 99.6 | 9.8 | 48 |
| 2 | 99.4 | 9.5 | 39 |
| 3 | 99.1 | 9.3 | 31 |
Claims (4)
1. a municipal sludge thickening, mummification and purification of water quality integral type treatment process is characterized in that adopting following steps:
(1) municipal sludge is promoted to sludge thickener through pump, concentrates in sludge thickener;
(2) the sinking mud after concentrating by the sludge thickener bottom by sewage sludge feed pump and pipeline input horizontal screw centrifuge; Polyacrylamide cationic flocculant in the dosing tank drops into horizontal screw centrifuge by the metering of dosing volume pump through described pipeline simultaneously, the polyacrylamide dosage is that the dried mud of per kilogram sinking mud adds 2～3g, the solid particulate bonding forms cluster of grains in the sinking mud, makes solid-liquid separation form supernatant liquor and mud cake;
(3) described mud cake is delivered to the sludge disposal place by Shaftless screw conveyor, and described supernatant liquor is refluxed by water pump by the clear liquor pipeline and is delivered in the sludge thickener;
(4) supernatant liquor in the sludge thickener by overflow groove by pipe-line transportation to filter bottom.
2. municipal sludge thickening according to claim 1, mummification and purification of water quality integral type treatment process is characterized in that: the mud concentration time is not less than 12h in the described sludge thickener of step (1), and available depth is preferably 4m.
3. municipal sludge thickening according to claim 1, mummification and purification of water quality integral type treatment process, it is characterized in that: the described filter interior filling of step (4) quartz sand filter media, the particle diameter of quartz sand filter media is 0.5mm ~ 0.8mm, highly be 12cm ~ 40cm, tap density is 1.85 g/cm
3, porosity is 43%.
4. municipal sludge thickening according to claim 1, mummification and purification of water quality integral type treatment process, it is characterized in that: the back-flushing method of the described strainer of step (4) is: when the resistance of strainer reaches 20cm, electronic residual cake valve is opened, the clear water reverse direction flow on strainer top is filtered the bed of material, along with the solid particulate at the filter material layer inwall is discharged through the deslagging recoil tube, each filter material layer position is passed through in back flushing successively under the drive of transmission shaft, finish backwash process; Backwashing period is 7d ~ 20d, and the time is 15min, and intensity is 4 L/ (m
2S) ~ 15 L/ (m
2S), filtering velocity is 25m/h ~ 30m/h, and backwash swelling rate is 40% ~ 50%, temperature≤95 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101323976A CN102167490A (en) | 2011-05-23 | 2011-05-23 | Integrated treatment method for thickening, drying and purifying municipal sludge |
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| CN2011101323976A CN102167490A (en) | 2011-05-23 | 2011-05-23 | Integrated treatment method for thickening, drying and purifying municipal sludge |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102874952A (en) * | 2012-09-29 | 2013-01-16 | 常州大学 | Treatment method of waste drilling fluid |
| CN102992542A (en) * | 2012-11-26 | 2013-03-27 | 常州大学 | Method for treating heavy-nitrogen mother solution generated from production of dinitrodiazophenol |
| CN105169757A (en) * | 2015-09-23 | 2015-12-23 | 邓永辉 | Waste dehydrating system |
| CN105461096A (en) * | 2014-08-11 | 2016-04-06 | 北京建筑材料科学研究总院有限公司 | Solid-liquid separation method for waste incineration fly ash washing slurry |
| CN105693060A (en) * | 2014-01-23 | 2016-06-22 | 天紫环保装备制造（天津）有限公司 | Small sludge harmless disposal system provided with movable baffle |
| CN105750308A (en) * | 2016-05-06 | 2016-07-13 | 海城市宝德畜牧设备制造有限公司 | Mobile intelligent animal harmless treatment vehicle for death |
| CN106316051A (en) * | 2015-06-19 | 2017-01-11 | 宜兴市富陶环境保护设备有限公司 | Centrifugal sludge dehydration system |
| CN106746484A (en) * | 2017-03-03 | 2017-05-31 | 上海绿美环保科技有限公司 | A kind of system of selection of environmentally friendly sludge dewatering preferred agents |
| CN107151153A (en) * | 2017-06-06 | 2017-09-12 | 扬州大学 | A kind of method that domestic sludge is made to compost |
| CN107721011A (en) * | 2017-10-24 | 2018-02-23 | 首钢京唐钢铁联合有限责任公司 | A kind of method for treating water of horizontal flow basin drainage |
| CN108316444A (en) * | 2018-03-16 | 2018-07-24 | 天津市鼎盛鑫科技有限公司 | A kind of urban sewer sludge purifier and method |
| CN109070102A (en) * | 2016-02-08 | 2018-12-21 | Eco水科技公司 | Waste water treatment system and method |
| CN109160707A (en) * | 2018-09-30 | 2019-01-08 | 广东溢丰环保科技有限公司 | A method of improving sludge dewatering efficiency |
| CN111116007A (en) * | 2019-12-31 | 2020-05-08 | 常州市深水城北污水处理有限公司 | Method for optimizing operation of concentration tank and improving efficiency |
| CN111646661A (en) * | 2020-05-25 | 2020-09-11 | 北京城市排水集团有限责任公司 | Energy recovery and fertilizer preparation process based on sludge pyrohydrolysis split-phase digestion |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102874952B (en) * | 2012-09-29 | 2014-04-30 | 常州大学 | Treatment method of waste drilling fluid |
| CN102874952A (en) * | 2012-09-29 | 2013-01-16 | 常州大学 | Treatment method of waste drilling fluid |
| CN102992542A (en) * | 2012-11-26 | 2013-03-27 | 常州大学 | Method for treating heavy-nitrogen mother solution generated from production of dinitrodiazophenol |
| CN105693060A (en) * | 2014-01-23 | 2016-06-22 | 天紫环保装备制造（天津）有限公司 | Small sludge harmless disposal system provided with movable baffle |
| CN105461096B (en) * | 2014-08-11 | 2018-12-11 | 北京建筑材料科学研究总院有限公司 | A kind of incineration of refuse flyash washing slurries solid-liquid separating method |
| CN105461096A (en) * | 2014-08-11 | 2016-04-06 | 北京建筑材料科学研究总院有限公司 | Solid-liquid separation method for waste incineration fly ash washing slurry |
| CN106316051A (en) * | 2015-06-19 | 2017-01-11 | 宜兴市富陶环境保护设备有限公司 | Centrifugal sludge dehydration system |
| CN105169757A (en) * | 2015-09-23 | 2015-12-23 | 邓永辉 | Waste dehydrating system |
| CN109070102A (en) * | 2016-02-08 | 2018-12-21 | Eco水科技公司 | Waste water treatment system and method |
| CN105750308A (en) * | 2016-05-06 | 2016-07-13 | 海城市宝德畜牧设备制造有限公司 | Mobile intelligent animal harmless treatment vehicle for death |
| CN106746484A (en) * | 2017-03-03 | 2017-05-31 | 上海绿美环保科技有限公司 | A kind of system of selection of environmentally friendly sludge dewatering preferred agents |
| CN107151153A (en) * | 2017-06-06 | 2017-09-12 | 扬州大学 | A kind of method that domestic sludge is made to compost |
| CN107721011B (en) * | 2017-10-24 | 2020-10-09 | 首钢京唐钢铁联合有限责任公司 | Water treatment method of advection pool sewage discharge system |
| CN107721011A (en) * | 2017-10-24 | 2018-02-23 | 首钢京唐钢铁联合有限责任公司 | A kind of method for treating water of horizontal flow basin drainage |
| CN108316444A (en) * | 2018-03-16 | 2018-07-24 | 天津市鼎盛鑫科技有限公司 | A kind of urban sewer sludge purifier and method |
| CN109160707A (en) * | 2018-09-30 | 2019-01-08 | 广东溢丰环保科技有限公司 | A method of improving sludge dewatering efficiency |
| CN111116007A (en) * | 2019-12-31 | 2020-05-08 | 常州市深水城北污水处理有限公司 | Method for optimizing operation of concentration tank and improving efficiency |
| CN111646661A (en) * | 2020-05-25 | 2020-09-11 | 北京城市排水集团有限责任公司 | Energy recovery and fertilizer preparation process based on sludge pyrohydrolysis split-phase digestion |
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Application publication date: 20110831 |