CN101376071A - Technique for separating mud and water in river and lake deposit - Google Patents
Technique for separating mud and water in river and lake deposit Download PDFInfo
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- CN101376071A CN101376071A CNA2008101967064A CN200810196706A CN101376071A CN 101376071 A CN101376071 A CN 101376071A CN A2008101967064 A CNA2008101967064 A CN A2008101967064A CN 200810196706 A CN200810196706 A CN 200810196706A CN 101376071 A CN101376071 A CN 101376071A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A20/40—Protecting water resources
- Y02A20/402—River restoration
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Abstract
The invention discloses a water-mud separation technology for bottom mud in rivers and lakes, which comprises the following steps of coagulant preparation, flocculant preparation, introduction of muddy water, coagulation, flocculation, etc. The method of the invention can quickly separate water from mud, avoid secondary pollution and purify the water.
Description
Technical field
The invention discloses the mud-water separation technology of a kind of river, lakebed mud, belong to environmental technology field.
Background technology
Begin from the 20 actual later stages seventies, along with the rapid expansion of economic total volume and the level of urbanization promote rapidly, environmental consciousness is thin in addition, China goes into the lake and goes into the industrial wastewater and the sanitary sewage discharge capacity in river and increase greatly, add fowl poultry aquaculture and a large amount of agricultural drain of using fertilizer and pesticide, make the river Lake Water Body be subjected to severe contamination.The disconnected plug of part city river landfill, disposal of trash, river is black smelly, and water ecological environment is seriously damaged.Along with the development of social material civilization and spiritual civilization, people are also more and more higher to environment requirement, and therefore how administering dystrophication becomes a problem that needs to be resolved hurrily.
Present domestic river bottom mud is removed the operational method that adopts and is mainly contained: operating types such as draining does that pool machinery is dredged and manually dredged, drainage machinery is not dredged, slush pump hydraulicking unit, Gan Tang are dredged, jet desilting, cutter suction dredger are dredged, air-powered pump desilting.Wherein do the pool and dredge and obstruction to open the navigation or air flight, generally will not adopt.Remaining is several except that cutter suction dredger compares environmental protection, and other are several all than the release that is easier to cause sedimentary suspension again and pollutant, cause secondary pollution.
Mud granule has huge specific area and highly hydrophilic because of being rich in moisture, and has in a large number in conjunction with water, and in conjunction with existing bond between water and the solid particle, activity is lower, needs just can remove by mechanical force or chemical reaction.Mechanical force comprises centrifugal dehydrator, filter press and seasoning etc., and is bigger with mechanical means power consumption, and disposal ability is limited.
Flocculation sedimentation, i.e. coagulation sedimentation, water treatment aspect at home and abroad is commonly used, and is a kind of not only economy but also simple method for treating water.Can be used for reducing the turbidity and the colourity of waste water, remove multiple macromolecule organic, some heavy metal ion and radioactive substance etc., can also well improve the dewatering of mud.In water treatment procedure, flocculant can effectively be removed in the water 80%～90% suspension and 65%～95% colloidal substance, and can effectively reduce the CODcr in the water.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of mud-water separation speed fast, can avoid the river that secondary pollution can also purify water, the mud-water separation technology of lakebed mud.
According to technical scheme provided by the invention, the mud-water separation technology of described river, lakebed mud comprises following steps:
The configuration of a, coagulant: in clean water body, add Fecl
3And stir control Fecl
3Mass percent concentration be 10～30%, standby;
The configuration of b, flocculant: add polyacrylamide (Polyscrylamide) and stir in clean water body, the mass percent concentration of control polyacrylamide is 0.1～0.2%, and is standby;
C, slime water import: earlier with contaminated water bottom sludge stirring, make it form the sludge suspension thing at water body, the polluted-water that will contain the sludge suspension thing again pumps in the slime water pipeline;
D, the slime water pipe outlet of coagulation: step c connects the entrance point of first blender, the coagulant that step a configures flows into pipeline by coagulant and inserts first blender, described first blender is horizontal tubular body, the port of export of first blender connects the coagulation pipe head, the caliber of slime water pipeline is 1:(1.5～3.5 with the ratio of the mixed zone internal diameter of first blender), slime water used time of first blender of flowing through is 3～5 seconds, slime water used time of coagulation pipeline of flowing through is 20～50 seconds, and the coagulant solid consumption of controlling slime water per ton is 80～150g;
E, flocculation: the coagulation pipe outlet of steps d connects the entrance point of second blender, the flocculant that step b configures inserts second blender by the flocculant flow ipe, described second blender also is horizontal tubular body, the port of export of second blender connects the flocculation pipe head, the caliber of coagulation pipeline is 1:(1.5～3.5 with the ratio of the mixed zone internal diameter of second blender), the slime water flocculation of flowing through is 10～50 seconds the used time of pipeline, and the flocculant crystal consumption of controlling slime water per ton is 10～25g.
The caliber of slime water pipeline, coagulation pipeline and the pipeline that flocculates is identical.The flow velocity of slime water in the slime water pipeline is 1.5～3 meter per seconds.
The advantage of this technology has following two aspects:
One, compared following advantage with traditional desilting:
1, occupied ground is little
The mud water content that traditional desilting comes up clearly is big, and occupied ground is big, and the time is long, causes that peri-urban rubbish Cheng Shan, mosquitos and flies grow, the situation of environmental pollution, and human beings'health is threatened.And this technology can make muddy water separate rapidly, and Yu Shui passes back into the lake, river or recycles, and occupied ground is little, and the time is short, is destitute of smell, and can not cause environmental pollution.
2, purify water
Traditional desilting mode slime water overflows, and surplus water can not be fully used.The surplus water of this technology passes back into the lake, river or recycles and can reach state sewage emission standard one-level B effluent standard.
3, the recycling of soil (soil innoxious)
(natural mummification or dose lime, cement etc.) general processing mode was a landfill after traditional desilting mode was treated the mud mummification, not only caused the waste of resource but also can cause secondary pollution to environment.And through the mud after this PROCESS FOR TREATMENT, can be used as the raw material of fertilizer or directly use soil to use as view with soil or gardens.
Two, compared following advantage with the processing of domestic sludge:
1, treating capacity is big, has formed the through engineering approaches scale
The processing treating capacity of domestic sludge is little in the sewage treatment plant, and energy consumption is big.And this PROCESS FOR TREATMENT amount is big, and day output generally can reach 15000m
3Formed the through engineering approaches scale.
2, mud different in kind
Several procedures such as sewage treatment plant's processing domestic sludge will pass through and concentrate, digestion, modulation, dehydration, and this technology is directly handled river lakebed mud, operation is simple.
The specific embodiment
The invention will be further described below in conjunction with specific embodiment.
The mud-water separation technology of river of the present invention, lakebed mud comprises following steps:
The configuration of a, coagulant: in clean water body, add Fecl
3And stir control Fecl
3Mass percent concentration be 10～30%, standby;
The configuration of b, flocculant: add polyacrylamide (Polyscrylamide) and stir in clean water body, the mass percent concentration of control polyacrylamide is 0.1～0.2%, and is standby;
C, slime water import: earlier with contaminated water bottom sludge stirring, make it form the sludge suspension thing at water body, the polluted-water that will contain the sludge suspension thing again pumps in the slime water pipeline;
D, the slime water pipe outlet of coagulation: step c connects the entrance point of first blender, the coagulant that step a configures flows into pipeline by coagulant and inserts first blender, described first blender is horizontal tubular body, the port of export of first blender connects the coagulation pipe head, the caliber of slime water pipeline is 1:(1.5～3.5 with the ratio of the mixed zone internal diameter of first blender), slime water used time of first blender of flowing through is 3～5 seconds, slime water used time of coagulation pipeline of flowing through is 20～50 seconds, and the coagulant solid consumption of controlling slime water per ton is 80～150g;
E, flocculation: the coagulation pipe outlet of steps d connects the entrance point of second blender, the flocculant that step b configures inserts second blender by the flocculant flow ipe, described second blender also is horizontal tubular body, the port of export of second blender connects the flocculation pipe head, the caliber of coagulation pipeline is 1:(1.5～3.5 with the ratio of the mixed zone internal diameter of second blender), the slime water flocculation of flowing through is 10～40 seconds the used time of pipeline, and the flocculant crystal consumption of controlling slime water per ton is 10～25g.
The caliber of slime water pipeline, coagulation pipeline and the pipeline that flocculates is identical.The flow velocity of slime water in the slime water pipeline is 1.5～3 meter per seconds.
Principle of the present invention is:
According to the Wen Qiuli principle, when slime water arrives first blender along the slime water pipeline, the coagulant that configures flows into pipeline by coagulant and inserts first blender, because the liquid flow section enlarges rapidly, because it is big that resistance becomes, liquid stream moment be spray regime then speed slow down, reduce again owing to diameter when going out first blender to the coagulation pipeline, speed moment returns to original level, and coagulant fully mixes with slime water in first blender.
Slime water used time of coagulation pipeline of flowing through is 20～50 seconds, makes slime water and coagulant fully react the purpose that reaches charge neutrality and slurry dewatering.Same principle made slime water fully mix with flocculant when slime water arrived second blender with flocculant then, fully reaction in the flocculation pipeline, because the adsorption bridging effect of flocculant makes the flocculation of sludge in the slime water agglomerating, muddy water separates rapidly.When process was raised the mud mouth, because the bigger speed of service, slime water was spouting, thereby really reaches the effect of mud-water separation.
Embodiment 1 calabash shell serving as a dipper river restoration of the ecosystem demonstration project
This engineering is the comprehensive government-works that integrates desilting, mud mummification, mud recycling, restoration of the ecosystem.Go into operation in November, 2007.Desilting and mud mummification are the first steps of whole engineering.This project is administered channel length 2Km, dredges about 50,000 sides of bed mud.
The configuration of a, coagulant: in clean water body, add Fecl
3And stir control Fecl
3Mass percent concentration be 15%, standby;
The configuration of b, flocculant: add polyacrylamide (Polyscrylamide) and stir in clean water body, the mass percent concentration of control polyacrylamide is 0.1%, and is standby;
C, slime water import: utilize 120 cutter suction dredgers that bed-silt is pumped into the slime water pipeline, the mud containing rate of slime water is about 15%.
D, the slime water pipe outlet of coagulation: step c connects the entrance point of first blender, the coagulant that step a configures flows into pipeline by coagulant and inserts first blender, described first blender is horizontal tubular body, the port of export of first blender connects the coagulation pipe head, the caliber of slime water pipeline (400mm), with the ratio of the mixed zone internal diameter (780mm) of first blender be 1:1.95, slime water used time of first blender of flowing through is 3 seconds, mixer length is 2.37 meters, slime water used time of coagulation pipeline of flowing through is 45 seconds, slime water is 3m/s at ducted flow velocity, duct length is 135m, and the coagulant solid consumption of controlling slime water per ton is 150g;
E, flocculation: the coagulation pipe outlet of steps d connects the entrance point of second blender, the flocculant that step b configures inserts second blender by the flocculant flow ipe, described second blender also is horizontal tubular body, the port of export of second blender connects the flocculation pipe head, the caliber of coagulation pipeline (400mm) is 1:1.95 with the ratio of the mixed zone internal diameter (780mm) of second blender, slime water used time of second blender of flowing through is 3 seconds, second mixer length is 2.37 meters, the slime water flocculation of flowing through is 30 seconds the used time of pipeline, flow velocity in the pipeline is 3m/s, duct length is 90m, and the flocculant crystal consumption of controlling slime water per ton is 13g.
The caliber of slime water pipeline, coagulation pipeline and the pipeline that flocculates is identical.The flow velocity of slime water in the slime water pipeline is 3 meter per seconds, and the flow velocity in blender is 0.79m/s.
The target one of this project is to purify water, and makes the surplus water after the processing reach national sewage discharge one-level B standard, the 2nd, and make slime water in pipeline, finish the rapid separation of muddy water.The 3rd, soil is innoxious.
1, purification of water quality
COD, BOD, ammonia nitrogen, total phosphorus, total nitrogen belong to bad V class water all above surface water V class standard in the former calabash shell serving as a dipper river matter, and specific targets see Table 1; Water quality after embodiments of the invention 1 are handled also sees Table 1.
Table 1 water quality monitoring result
| Test item | Country-level B standard | Former river | Water after the processing |
| COD(mg/L) | 60 | 142 | 49 |
| SS(mg/L) | 20 | 122 | 20 |
| BOD(mg/L) | 20 | 14.7 | 3.1 |
| TN(mg/L) | 20 | 5.11 | 6.82 |
| TP(mg/L) | 1 | 0.64 | 0.12 |
| NH 3-N(mg/L) | 8 | 4.17 | 5.72 |
| Phosphate (mg/L) | 0.19 | 0.09 | |
| Mercury (mg/L) | 0.001 | Do not detect | Do not detect |
| Arsenic (mg/L) | 0.1 | 0.015 | 0.015 |
| Plumbous (mg/L) | 0.1 | 0.005 | <0.001 |
| Chromium (mg/L) | 0.1 | Do not detect | Do not detect |
| Cadmium (mg/L) | 0.01 | Do not detect | Do not detect |
Former as can be seen from the above table river is bad five class water, meets state sewage emission standard one-level B standard through after handling.This shows that the method can purify water.
2, mud separates rapidly
Slime water about 15% mud containing rate enters mummifying pool finish mud-water separation in pipeline after, and after Yu Shui discharged, the mud containing rate of mud was about 33% in the mummifying pool.
3, soil is innoxious
Table 2 soil testing result
Table 3 soil physico-chemical property testing result
| Test item | Before the processing | After the processing | DBJ08-231-98 |
| PH | 7.36 | 7.36 | 6.0-7.8 |
| EC(ms/cm) | 1.64 | 1.64 | 0.35-1.20 |
| Total salt quantity (g/Kg) | 3.15 | 3.15 | <1.0 |
| Organic (g/Kg) | 46.9 | 46.85 | >＝20 |
| Full nitrogen (g/Kg) | 2.3 | 3.1 | |
| Rapid available phosphorus (mg/Kg) | 68.7 | 68.7 | 5～10 |
| Available potassium (mg/Kg) | 175.95 | 175.95 | 70-125 |
| Unit weight (g/cm3) | 1.1 | 0.88 | <＝1.30 |
| Total porosity (%) | 30.9 | 65.08 | |
| Aeration porosity (%) | 14.85 | 21.12 | >＝10 |
| Capillary porosity (%) | 32.4 | 43.96 | |
| Lime reaction | A little less than | A little less than | Weak-in |
As can be seen from Table 2, the content of beary metal in the mud after the processing decreases, and institute's with medicament has no adverse effect to soil.
As can be seen from Table 3: pH is within the GB scope, but to add improvement such as acid medium, peat during the acid green plants of plantation happiness, other physics and chemistry situations are more reasonable, and as content of organic matter height, nutrient is abundant, its nutrient situation is between Soil and Fertilizer, aeration is good, a little less than the lime reaction, is fit to do gardens with native, and this kind technology can also be quickened the mud mummification, makes mud reach the bearing capacity of 70～80Kpa in 3 months.
Embodiment 2 Zhang village creek restoration of the ecosystem engineerings
This engineering is the comprehensive government-works that integrates desilting, mud mummification, mud recycling, restoration of the ecosystem.Go into operation in June, 2008.Desilting and mud mummification are the first steps of whole engineering.This project is administered channel length 1Km, dredges bed mud 1.2 ten thousand sides.
The configuration of a, coagulant: in clean water body, add Fecl
3And stir control Fecl
3Mass percent concentration be 10%, standby;
The configuration of b, flocculant: add polyacrylamide (Polyscrylamide) and stir in clean water body, the mass percent concentration of control polyacrylamide is 0.2%, and is standby;
C, slime water import: earlier river is drained, with slush pump hydraulicking unit bed-silt is diluted to mud containing rate about 20% then and pumps in the slime water pipeline;
The slime water pipe outlet of d, coagulation: step c connects the entrance point of first blender, the coagulant that step a configures flows into pipeline by coagulant and inserts first blender, described first blender is horizontal tubular body, the port of export of first blender connects the coagulation pipe head, the caliber of slime water pipeline (200mm) is 1:3.5 with the ratio of the mixed zone internal diameter (700mm) of first blender, slime water used time of first blender of flowing through is 5 seconds, and mixer length is 0.61 meter.Slime water used time of coagulation pipeline of flowing through is 50 seconds, and ducted flow velocity is 1.5m/s, and duct length is 75m, and the coagulant solid consumption of controlling slime water per ton is 80g;
E, flocculation: the coagulation pipe outlet of steps d connects the entrance point of second blender, the flocculant that step b configures inserts second blender by the flocculant flow ipe, described second blender also is horizontal tubular body, the port of export of second blender connects the flocculation pipe head, the caliber of coagulation pipeline (200mm) is 1:3.5 with the ratio of the mixed zone internal diameter (700mm) of second blender, flow through time of second blender of slime water is 5 seconds, and the length of second blender is 0.61 meter.The slime water flocculation of flowing through is 10 seconds the used time of pipeline, and ducted flow velocity is 1.5m/s, and duct length is 15m.The flocculant crystal consumption of controlling slime water per ton is 25g.
The caliber of slime water pipeline, coagulation pipeline and the pipeline that flocculates is identical.The flow velocity of slime water in the slime water pipeline is 2 meter per seconds.Flow velocity in blender is 0.12m/s.
Engineering effort: the target one of this project is to purify water, and makes the surplus water after the processing reach national sewage discharge one-level B standard; The 2nd, make mud in the trimestral time, reach the bearing capacity of 70～80Kpa.
COD, BOD, ammonia nitrogen, total phosphorus, total nitrogen belong to bad V class water all above surface water V class standard in the creek water quality of former Zhang village, and specific targets see Table 4; Water quality after embodiments of the invention 2 are handled also sees Table 4.
Table 4 water quality monitoring result
| Test item | Country-level B standard | Former river | Water after the processing |
| COD(mg/L) | 60 | 37 | 21 |
| SS(mg/L) | 20 | 62 | 19 |
| BOD(mg/L) | 20 | 8.3 | 5.6 |
| TN(mg/L) | 20 | 9.18 | 9.53 |
| TP(mg/L) | 1 | 0.57 | 0.2 |
| NH 3-N(mg/L) | 8 | 4.66 | 7.8 |
| Mercury (mg/L) | 0.001 | Do not detect | Do not detect |
| Arsenic (mg/L) | 0.1 | 0.014 | 0.014 |
| Plumbous (mg/L) | 0.1 | 0.01 | 0.005 |
| Chromium (mg/L) | 0.1 | 0.03 | 0.03 |
| Cadmium (mg/L) | 0.01 | 0.001 | Do not detect |
As can be seen from Table 4, former river is bad five class water, meets state sewage emission standard one-level B standard through after handling.This shows that the method can purify water.
2, mud mummification
Slime water about 15% mud containing rate enters mummifying pool finish mud-water separation in pipeline after, and after Yu Shui discharged, the mud containing rate of mud was about 35% in the mummifying pool.
3, soil is innoxious
Table 5 soil testing result
Table 6 soil physical chemistry character testing result
| Test item | Before the processing | After the processing | DBJ08-231-98 |
| PH | 7.9 | 7.57 | 6.0-7.8 |
| EC(ms/cm) | 1.36 | 1 | 0.35-1.20 |
| Total salt quantity (g/Kg) | 2.95 | 0.85 | <1.0 |
| Organic (g/Kg) | 43 | 44.48 | >＝20 |
| Full nitrogen (g/Kg) | 3.4 | 4.11 | |
| Rapid available phosphorus (mg/Kg) | 32.36 | 9.5 | 5～10 |
| Available potassium (mg/Kg) | 291.24 | 112 | 70-125 |
| Unit weight (g/cm3) | 1.4 | 0.76 | <＝1.30 |
| Total porosity (%) | 30 | 68.87 |
| Aeration porosity (%) | 16 | 35.98 | >＝10 |
| Capillary porosity (%) | 30 | 32.89 | |
| Lime reaction | A little less than | A little less than | Weak-in |
As can be seen from Table 5, the content of beary metal in the mud after the processing decreases, and institute's with medicament has no adverse effect to soil.
As can be seen from Table 6: pH is within the GB scope, but to add improvement such as acid medium, peat during the acid green plants of plantation happiness, other physics and chemistry situations are more reasonable, and as content of organic matter height, nutrient is abundant, its nutrient situation is between Soil and Fertilizer, aeration is good, a little less than the lime reaction, is fit to do gardens with native, and this kind technology can also be quickened the mud mummification, makes mud reach the bearing capacity of 70～80Kpa in 3 months.
Embodiment 3 calabash shell serving as a dipper lake basin restoration of the ecosystem engineerings
This engineering is the comprehensive government-works that integrates desilting, mud mummification, mud recycling, restoration of the ecosystem.Go into operation in November, 2007.Desilting and mud mummification are the first steps of whole engineering.This project is administered channel length 2Km, dredges bed mud 4.5 ten thousand sides.
The configuration of a, coagulant: in clean water body, add Fecl
3And stir control Fecl
3Mass percent concentration be 30%, standby;
The configuration of b, flocculant: add polyacrylamide (Polyscrylamide) and stir in clean water body, the mass percent concentration of control polyacrylamide is 0.15%, and is standby;
C, slime water import: utilize 120 cutter suction dredgers that bed-silt is pumped into the slime water pipeline, the mud containing rate of slime water is about 10%.
The slime water pipe outlet of d, coagulation: step c connects the entrance point of first blender, the coagulant that step a configures flows into pipeline by coagulant and inserts first blender, described first blender is horizontal tubular body, the port of export of first blender connects the coagulation pipe head, the caliber of slime water pipeline (300mm) is 1:1.5 with the ratio of the mixed zone internal diameter (450mm) of first blender, slime water used time of first blender of flowing through is 4 seconds, and the length of first blender is 3.56 meters.Slime water used time of coagulation pipeline of flowing through is 20 seconds, and velocity in pipes is 2m/s, and duct length is 40m, and the coagulant consumption of controlling slime water per ton is 120g;
E, flocculation: the coagulation pipe outlet of steps d connects the entrance point of second blender, the flocculant that step b configures inserts second blender by the flocculant flow ipe, described second blender also is horizontal tubular body, the port of export of second blender connects the flocculation pipe head, the caliber of coagulation pipeline (300mm) is 1:1.5 with the ratio of the mixed zone internal diameter (450mm) of second blender, flow through time of second blender of slime water is 4 seconds, and the length of second blender is 3.56 meters.The slime water flocculation of flowing through is 40 seconds the used time of pipeline, and flow velocity is 2m/s in the pipeline, and duct length is 80m.The flocculant crystal consumption of controlling slime water per ton is 10g.
The caliber of slime water pipeline, coagulation pipeline and the pipeline that flocculates is identical.The flow velocity of slime water in the slime water pipeline is 3 meter per seconds.The flow velocity of slime water in blender is 0.89 meter per second.
One, purifies water
COD, BOD, ammonia nitrogen, total phosphorus, total nitrogen belong to bad V class water all above surface water V class standard in the water quality of former calabash shell serving as a dipper lake basin, and specific targets see Table 5; Water quality after embodiments of the invention 3 are handled also sees Table 7.
Table 7
| Test item | Country-level B standard | Former river | Water after the processing |
| COD(mg/L) | 60 | 21 | 19 |
| SS(mg/L) | 20 | 56 | 15 |
| BOD(mg/L) | 20 | 10 | 5.4 |
| TN(mg/L) | 20 | 5.34 | 1.5 |
| TP(mg/L) | 1 | 0.63 | 0.18 |
| NH 3-N(mg/L) | 8 | 3.4 | 2.0 |
| Mercury (mg/L) | 0.001 | Do not detect | Do not detect |
| Arsenic (mg/L) | 0.1 | 0.013 | 0.013 |
| Plumbous (mg/L) | 0.1 | 0.01 | 0.005 |
| Chromium (mg/L) | 0.1 | 0.03 | 0.03 |
| Cadmium (mg/L) | 0.01 | 0.001 | Do not detect |
Former as can be seen from Table 7 river is bad five class water, meets state sewage emission standard one-level B standard through after handling.This shows that the method can purify water.
2, mud mummification
Slime water about 15% mud containing rate enters mummifying pool finish mud-water separation in pipeline after, and after Yu Shui discharged, the mud containing rate of mud was about 35% in the mummifying pool.
3, soil is innoxious
Table 8 soil testing result
Table 9 soil physical chemistry character testing result
| Test item | Before the processing | After the processing | DBJ08-231-98 |
| PH | 7.69 | 7.45 | 6.0-7.8 |
| EC(ms/cm) | 1.26 | 0.9 | 0.35-1.20 |
| Total salt quantity (g/Kg) | 2.65 | 0.80 | <1.0 |
| Organic (g/Kg) | 40 | 40.48 | >＝20 |
| Full nitrogen (g/Kg) | 3.8 | 4.01 | |
| Rapid available phosphorus (mg/Kg) | 34.36 | 8.5 | 5～10 |
| Available potassium (mg/Kg) | 295.24 | 110 | 70-125 |
| Unit weight (g/cm3) | 1.3 | 0.66 | <＝1.30 |
| Total porosity (%) | 36 | 68.97 | |
| Aeration porosity (%) | 30 | 45.98 | >＝10 |
| Capillary porosity (%) | 34 | 37.89 | |
| Lime reaction | A little less than | A little less than | Weak-in |
As can be seen from Table 8, the content of beary metal in the mud after the processing decreases, and institute's with medicament has no adverse effect to soil.
As can be seen from Table 9: pH is within the GB scope, but to add improvement such as acid medium, peat during the acid green plants of plantation happiness, other physics and chemistry situations are more reasonable, and as content of organic matter height, nutrient is abundant, its nutrient situation is between Soil and Fertilizer, aeration is good, a little less than the lime reaction, is fit to do gardens with native, and this kind technology can also be quickened the mud mummification, makes mud reach the bearing capacity of 70～80Kpa in 3 months.
Claims (3)
1, the mud-water separation technology of a kind of river, lakebed mud is characterized in that this method comprises following steps:
The configuration of a, coagulant: in clean water body, add Fecl
3And stir control Fecl
3Mass percent concentration be 10%～40%, standby;
The configuration of b, flocculant: add polyacrylamide (Polyscrylamide) and stir in clean water body, the mass percent concentration of control polyacrylamide is 0.1～0.2% standby;
C, slime water import: utilizing cutter suction dredger or slush pump hydraulicking unit is that the slime water of 10～20% mud containing rates pumps into the slime water pipeline then with the bed-silt dilution.
D, the slime water pipe outlet of coagulation: step c connects the entrance point of first blender, the coagulant that step a configures flows into pipeline by coagulant and inserts first blender, described first blender is horizontal tubular body, the port of export of first blender connects the coagulation pipe head, the caliber of slime water pipeline is 1:(1.5～3.5 with the ratio of the mixed zone internal diameter of first blender), slime water used time of first blender of flowing through is 3～5 seconds, slime water used time of coagulation pipeline of flowing through is 20～50 seconds, and the coagulant solution consumption of controlling slime water per ton is 0.4～1.5Kg;
E, flocculation: the coagulation pipe outlet of steps d connects the entrance point of second blender, the flocculant that step b configures inserts second blender by the flocculant flow ipe, described second blender also is horizontal tubular body, the port of export of second blender connects the flocculation pipe head, the caliber of coagulation pipeline is 1:(1.5～3.5 with the ratio of the mixed zone internal diameter of second blender), the slime water flocculation of flowing through is 10～40 seconds the used time of pipeline, and the flocculant solution consumption of controlling slime water per ton is 5～25Kg.
2, the mud-water separation technology of river as claimed in claim 1, lakebed mud is characterized in that: the caliber of slime water pipeline, coagulation pipeline and the pipeline that flocculates is identical.
3, the mud-water separation technology of river as claimed in claim 1, lakebed mud is characterized in that: the flow velocity of slime water in the slime water pipeline is 1.5～3 meter per seconds.
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