CN110152591A - A kind of preparation method of city river polluted bed mud activity cover plate - Google Patents
A kind of preparation method of city river polluted bed mud activity cover plate Download PDFInfo
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- CN110152591A CN110152591A CN201910490943.XA CN201910490943A CN110152591A CN 110152591 A CN110152591 A CN 110152591A CN 201910490943 A CN201910490943 A CN 201910490943A CN 110152591 A CN110152591 A CN 110152591A
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
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- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3007—Moulding, shaping or extruding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3042—Use of binding agents; addition of materials ameliorating the mechanical properties of the produced sorbent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/30—Processes for preparing, regenerating, or reactivating
- B01J20/3078—Thermal treatment, e.g. calcining or pyrolizing
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/42—Materials comprising a mixture of inorganic materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
- B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/18—PO4-P
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Abstract
The invention discloses a kind of preparation methods of city river polluted bed mud activity cover plate, it includes the following steps: that (1) collects purification plant sludge and sludge cake is made, and sludge bulking is made in temperature lower calcination 3.5-4.5h of the sludge cake at 380-450 DEG C；(2) sludge bulking is mechanically pulverized and mechanical concussion is sieved, the calcining modified sewage sludge particle that partial size is 1~5mm is made；(3) modified sewage sludge particle, cement, 17~18 parts in proportion of flyash will be calcined, 4~6 parts of cement, 5~8 parts of flyash, water-cement ratio 0.26~0.29 is added blender and mixes, and standing is sufficiently mixed aggregate and binder；(4) bottom material being stirred is added in framed and is suppressed, the pressing time is 60~80s, and the pressure of compacting is 0.75~0.8MPa；(5) it is demoulded to obtain cover plate within 12~16 hours after molding to be pressed；(6) covering board finished product is under natural open-air condition, 20~25 DEG C of temperature, can engineer application after standing 12-16 days.Cover plate made from the method for the present invention has many advantages, such as that water permeable ability is good, water-retaining property is high, resistance to erosion.
Description
Technical field
The invention belongs to recycling sludge processing technology fields, and in particular to a kind of city river polluted bed mud activity covering
The preparation method of plate.
Background technique
With the development of Chinese society and chemical industry, city river water body ecological environment causes anxiety, especially river water body
Eutrophication problem is especially prominent.The main limiting factor of water eutrophication is nitrogen and phosphorus, and nitrogen phosphorus is constantly tired in river water body
Product, causes water eutrophication further serious.As government's manpower and material resources that increase input administer water environment, dirty and limit row etc. is being cut
Aspect obtains certain effect, controls exogenous nitrogen phosphorus.The remittance and source of endogenous (bed mud) as nitrogen phosphorus, sediment release nitrogen phosphorus at
The main source of Water phosphorus.As it can be seen that controlling substrate sludge nitrogen phosphorus in water body under the premise of outer source of nitrogen and phosphorus is effectively controlled
Release is to control one of the effective measures of water eutrophication.
Currently, the major measure of control substrate sludge nitrogen phosphorus release has dredging and covering.Because cladding process have to bed mud disturb it is small,
Project cost is lower, it is smaller to environment potential hazard, do not change water body property, be suitable for the advantages that a variety of inorganic and organic bed mud
And paid close attention to by scholars, it is especially quickly grown in the U.S., Europe, Japan, obtains extensive practical engineering application.But city
River flow velocity is larger when river course flood is drained flooded fields, scouring intensity is big, causes covering material to suspend, be lost, conventional blanket is caused to become
It is thin gradually to fail.
Summary of the invention
The present invention provides a kind of preparation methods of city river polluted bed mud activity cover plate, and which overcome background techniques
Described in the deficiencies in the prior art.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of preparation method of city river polluted bed mud activity cover plate, it includes the following steps:
(1) it collects purification plant sludge and sludge cake, temperature lower calcination 3.5-4.5h of the sludge cake at 380-450 DEG C, system is made
Obtain sludge bulking；
(2) sludge bulking is mechanically pulverized and mechanical concussion is sieved, the calcining modified sewage sludge that partial size is 1~5mm is made
Grain；
(3) will calcine modified sewage sludge particle, cement, 17~18 parts in proportion of flyash, 4~6 parts of cement, flyash 5~8
Part, water-cement ratio 0.26~0.29 is added blender and mixes, and standing is sufficiently mixed aggregate and binder；
(4) bottom material being stirred is added in framed and is suppressed, the pressing time is 60~80s, and the pressure of compacting is
0.75~0.8MPa；
(5) it is demoulded to obtain cover plate within 12~16 hours after molding to be pressed；
(6) covering board finished product is under natural open-air condition, 20~25 DEG C of temperature, can engineer application after standing 12-16 days.
Among one embodiment: in the step (1), sludge is made in temperature lower calcination 3h by the sludge cake at 400 DEG C
Block.
Among one embodiment: stirring 2~3min in the step (3), in blender and mix.
Among one embodiment: in the step (3), standing 5min is sufficiently mixed aggregate and binder.
Among one embodiment:, can engineer application after standing 14 days in the step (6).
The technical program compared with the background art, it has the following advantages:
1, the preparation method of a kind of city river polluted bed mud activity cover plate provided by the invention, the cover plate of preparation
Have many advantages, such as that water permeable ability is good, water-retaining property is high, resistance to erosion.
2, it is covered on polluted bed mud, not only effectively control substrate sludge nitrogen phosphorus release, but also can be cut down in overlying water
Nitrogen phosphorus, can effectively control water eutrophication, and itself does not discharge nitrogen phosphorus to water body.
3, when solving river course flood water drainage, cause traditional covering material outstanding because river flow velocity is larger, scouring intensity is big
Floating, losing issue.
4, according to river field condition, active cover plate can make the shapes such as square, rectangle, site operation program letter
It is single, and cover uniform.
5, method and process of the invention is simple, low in cost.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1-Fig. 2 is the test knot that 2 bed mud activity cover plate of case study on implementation of the present invention cuts down nitrogen phosphorus in water effect disquisition
Fruit figure, wherein Fig. 1 is NH in water body under different materials activity cover plate4 +- N concentration variation diagram, Fig. 2 are that different materials activity is covered
PO in water body under cover board4 3-- P concentration variation diagram.
Fig. 3-Fig. 4 is the test result that 3 bed mud activity cover plate of case study on implementation of the present invention controls the research of nitrogen phosphorus releasing effect
Figure, wherein Fig. 3 is that different materials activity cover plate covers NH in system overlying water4 +- N concentration variation diagram, Fig. 4 are different materials
PO in active cover plate covering system overlying water4 3-- P concentration variation diagram.
Specific embodiment
1 bed mud activity cover plate infiltration coefficient of embodiment, water-retaining property wash away loss and compare experimental study
(1) implementation process
In the present embodiment, the bed mud for studying the mass ratio production of different calcining modified sewage sludge particles, cement and flyash is living
Property the infiltration coefficient of cover plate, water-retaining property, the variation range for washing away loss ratio.
In the present embodiment, the mass ratio of 16 kinds of calcining modified sewage sludge particles, cement and flyash is taken altogether, calcines modified sewage sludge
Particle is 180g, and cement and flyash quality suitably change, and cement quality variation is divided into 4 groups, 1~4# of number；1#: cement
40g, flyash are respectively 50,60,70,80g；2#: cement 50g, flyash is respectively 50,60,70,80g；3#: cement 60g,
Flyash is respectively 50,60,70,80g；4#: cement 70g, flyash is respectively 50,60,70,80g；Wherein water-cement ratio is according to feelings
Condition takes 0.26~0.29.
In the present embodiment, coefficient of permeability test operation mode and calculation method are according to " National Standard of the People's Republic of China "
It is corresponding interior in " the appendix C coefficient of permeability test method " of " permeable pavement brick and porous pavement plate " in (GB/T 25993-2010)
Hold and implements.Wherein, the experimental rig of coefficient of permeability is according to corresponding specification self-control.
In the present embodiment, water retention test mode of operation and calculation method are specific as follows:
1) mode of operation
1. each edge measurement is primary with the side length of gage measuring cover plate, the average value of relative edge is taken, 0.1cm is accurate to.
Calculate the top surface area (A) of cover plate；
2. cover plate is placed in the drying in oven that temperature is 100 DEG C ± 5 DEG C, cover plate is taken out into weighing one every for 24 hours
It is secondary, until the difference of consecutive weighings is considered as dry cover plate quality (M1) less than 0.1% twice；
3. being put into sink vertically after cover plate is cooled to room temperature, the distilled water that injection temperature is 20 DEG C ± 10 DEG C will
Cover plate submergence, makes the water surface be higher by cover plate about 20cm；
4. impregnating in water for 24 hours, take out cover plate upper surface from water upwards, it is attached to wipe surface with the wet towel wrung out
Dampening weighs immediately, for the quality (M2) of cover plate water suction for 24 hours.
2) calculation method
The calculation formula of water-retaining property are as follows: B=(M2-M1)/A
B is water-retaining property in formula, and unit is gram (g/cm every square centimeter2)；A is the upper surface area of test specimen, and unit is flat
Square centimetre of (cm2)；M1 is the quality of dry cover plate, and unit is gram (g)；M2 is the quality that cover plate absorbs water for 24 hours, and unit is gram
(g)。
In the present embodiment, washing away loss than test method is that will inhale water saturated cover plate and be put into flow rate of water flow to be
The organic glass of 0.33cm/s washes away and washes away 96h in sink, is then compared, is calculated according to the of poor quality and proper mass for washing away front and back
Pledge amount loss rate as washes away loss ratio.Wherein organic glass sink length × width × height=60cm × 30cm × 20cm, the water surface
High 15cm flows water circulation using immersible pump.
(2) result of implementation
According to calculating, the coefficient of permeability of (15 DEG C) cover plate when normal temperature: 1# is respectively 0.057,0.047,0.040,
0.031cm/s；2# is respectively 0.033,0.038,0.030,0.019cm/s；3# is respectively 0.017,0.014,0.013,
0.010cm/s；4# is respectively 0.005,0.003,0.001,0.001；I.e. normal temperature when (15 DEG C) coefficient of permeability range take
0.010~0.057cm/s.
According to calculating, cover plate water-retaining property: 1# is respectively 0.61,0.71,0.83,0.89g/cm2；2# is respectively 0.69,
0.71、0.71、0.72g/cm2；3# is respectively 0.55,0.57,0.58,0.65g/cm2；4# is respectively 0.49,0.50,0.50,
0.53g/cm2；I.e. water-retaining property range can use 0.55~0.89g/cm2。
According to calculating, after continuously washing away 96h under the flow velocity of 0.33cm/s, cover plate washes away loss ratio, and: 1# is respectively
1.90%, 1.50%, 1.44%, 0.92%；2# is respectively 1.26%, 0.97%, 0.73%, 0.75%；3# is respectively
1.04%, 0.79%, 0.88%, 0.92%；4# is respectively 1.00%, 0.97%, 0.94%, 1.18%；Wash away loss ratio
Range desirable 0.73%~1.90%.
2 bed mud activity cover plate of embodiment cuts down effect disquisition to nitrogen phosphorus in water
(1) testing program
Test carries out in the transparent rectangular organic glass cylinder of 16cm × 16cm × 16cm；Test water is from water distribution, institute
The ammonia nitrogen concentration of water distribution is 48.06mg/L, orthophosphates concentration 4.98mg/L.
1. cover plate used, which is respectively as follows:, in test uses calcining modified sewage sludge particle, cement and flyash to be made of raw material,
Modified sewage sludge particle 180g, cement 50g, flyash 70g are wherein calcined, referred to as calcining modified sewage sludge group；2. being modified using calcining
Mud granule, zeolite, cement and flyash are made of raw material, wherein calcining modified sewage sludge particle 150g, zeolite 70g, cement
50g, flyash 70g, referred to as calcining modified sewage sludge+zeolite group.
9 organic glass cylinders are shared in test, are divided into 3 groups, every group 3 parallel, and number is 1~3#, wherein 1# is control
Group does not place active cover plate；2# is calcining modified sewage sludge group, is placed using calcining modified sewage sludge particle, cement and flyash
For cover plate made of raw material；3# is calcining modified sewage sludge+zeolite group, is placed using calcining modified sewage sludge particle, zeolite, cement
It is cover plate made of raw material with flyash；There is 2.0L water distribution in each organic glass cylinder.
It tests and starts to carry out on March 15th, 2019, April 10 terminated, and lasted 26d；Organic glass cylinder is opened wide and (is not controlled
Water distribution DO concentration), it places indoors, test carries out at room temperature；Water temperature, DO and pH at depth of water 5cm in results of regular determination each group；It is fixed
Phase water sampling measures ammonia nitrogen, orthophosphates in water sample respectively, is carried out being supplemented to former scale with tap water after each water sampling
Line.
Research calcining modified sewage sludge particle, cement and flyash are bed mud activity cover plate made of raw material to nitrogen phosphorus in water
Cut down effect；And suitably reduce a certain amount of calcining modified sewage sludge particle, a certain amount of zeolite of addition again, obtain calcining modified sewage sludge+
Zeolite group selects optimum feed stock and proportion compared with only calcining modified sewage sludge group carries out cutting down effect to nitrogen phosphorus in water.
(2) test results and analysis
During lasting the test of 26d, each group water temperature variation range is 19.6~27.4 DEG C, and DO variation range is 7.37
~12.10, pH variation range are 6.74~9.76, and the variation of ammonia nitrogen and orthophosphates concentration is respectively such as Fig. 1 and Fig. 2 in each group water
It is shown.
As seen from Figure 1, compared with the control, the cover plate made using calcining modified sewage sludge particle as primary raw material is in water body
The average reduction rate of ammonia nitrogen is 73.57%, illustrates that calcining modified sewage sludge particle is that primary raw material production cover plate can effectively be cut
Ammonia nitrogen in diminishing；It is averaged using calcining the cover plate that modified sewage sludge particle and zeolite make as primary raw material to ammonia nitrogen in water body
Reduction rate is 72.06%, illustrates that calcining modified sewage sludge particle+zeolite cover plate also preferably cuts down effect to ammonia nitrogen in water.Analysis
The reason that the effect of purification plant sludge+zeolite group (i.e. calcining modified sewage sludge particle+zeolite covers board group) is poor is zeolite surface
It is wrapped up by cement and flyash, pore plugging causes adsorption capacity to be decreased obviously, so that adsorption energy of the 70g zeolite to ammonia nitrogen
Power calcines modified sewage sludge particle not as good as 30g.Variance analysis show calcine modified sewage sludge group, calcining modified sewage sludge+zeolite group with it is right
There is notable difference (P < 0.05) according to ammonia nitrogen effect is cut down between group.
From Figure 2 it can be seen that compared with the control, the cover plate made as primary raw material using to calcine modified sewage sludge particle is in water body
The average reduction rate of orthophosphates is 82.81%, illustrates the cover plate energy made to calcine modified sewage sludge particle as primary raw material
It is enough effectively to cut down orthophosphates in water；The cover plate made using calcining modified sewage sludge and zeolite as primary raw material is to phosphorus positive in water body
The average reduction rate of hydrochlorate is 80.60%, illustrates that orthophosphates in water can also be had preferably by calcining modified sewage sludge+zeolite cover plate
Cut down effect.Variance analysis shows that purification plant sludge group (calcining modified sewage sludge group), (calcining is modified purification plant sludge+zeolite group
Sludge+zeolite group) and control group between cut down orthophosphates effect have notable difference (P < 0.05).
In summary, it is known that living to calcine the bed mud that modified sewage sludge particle, cement and flyash are primary raw material production
Property cover plate can effectively cut down the nitrogen phosphorus in water body, addition zeolite cuts down effect to nitrogen phosphorus in water and is not significantly improved, because
This selects calcining modified sewage sludge particle, cement and flyash to cover board raw material for production bed mud activity.
The active cover plate control substrate sludge nitrogen phosphorus releasing effect research of embodiment 3
(1) testing program
Test carries out in the transparent rectangular organic glass cylinder of 16cm × 16cm × 16cm；Bed mud in each organic glass cylinder
About 1.15kg, thickness are about 5cm, wherein bed mud used is derived from Huaqiao University, school district, Xiamen egression lake sediments；It is covered on bed mud
It is covered with the plate covering that length × wide=15cm × 15cm and thickness are about 0.5cm；Overlying water is tap water；Using siphon principle, lead to
It crosses plastic flexible pipe and tap water is slowly added in cylinder along casing wall, overlying water volume is about 2L.
Activity cover plate used, which is respectively as follows: 1. use, in test calcines modified sewage sludge particle, cement and flyash as raw material
It is made, wherein calcining modified sewage sludge particle 180g, cement 50g, flyash 70g, referred to as calcining modified sewage sludge group；2. with sand,
Cement and flyash are made of raw material, and wherein dosage is sand 180g, cement 50g, flyash 70g, referred to as sand group.
9 organic glass cylinders are shared in test, are divided into 3 groups, every group 3 parallel, and number is 1~3#, wherein 1# is control
Group, without cover plate on bed mud；2# is calcining modified sewage sludge group, and covering is using calcining modified sewage sludge particle, cement and powder on bed mud
Coal ash is activity cover plate made of raw material；3# is sand group, covers on bed mud and is made using sand, cement and flyash by raw material
Inertia cover plate.
It tests and starts to carry out on March 15th, 2019, April 10 terminated, history 26d；Organic glass cylinder is opened wide and (is not controlled
Water distribution DO concentration), it places indoors, test carries out at room temperature；Water temperature, DO and pH at depth of water 5cm in results of regular determination each group；It is fixed
Phase water sampling measures ammonia nitrogen, orthophosphates in water sample respectively, is carried out being supplemented to former scale with tap water after each water sampling
Line.
Research uses calcining modified sewage sludge particle, cement and flyash to control substrate sludge nitrogen for activity cover plate made of raw material
Phosphorus releasing effect and there are problems, and bed mud control is covered with by inertia cover plate made of raw material of sand, cement and flyash
Nitrogen phosphorus releasing effect processed is compared.
(2) test results and analysis
During the test of history 26d, each group water temperature variation range is 19.8~27.9 DEG C, and DO variation range is 7.94
~13.41, pH variation range are 7.81~9.13, and the variation of ammonia nitrogen and orthophosphates concentration is respectively such as Fig. 3 and Fig. 4 in each group water
It is shown.
As seen from Figure 3, compared with the control, the active cover plate made using calcining modified sewage sludge particle as primary raw material is to ammonia
Nitrogen reduction rate is 42.42%~96.34%, mean value 81.31%, illustrates to make to calcine modified sewage sludge particle as primary raw material
Active cover plate can effectively control bed mud ammonia nitrogen release；The inertia cover plate made using sand as primary raw material is to ammonia nitrogen
Average reduction rate is 75.10%, illustrates that sand inertia cover plate also can be effectively controlled the release of bed mud ammonia nitrogen.It is modified dirty to compare calcining
Mud group and sand group can obtain the suction-operated that cover plate control bed mud ammonia nitrogen release is mainly physics coverage and active material.Side
Difference analysis shows, calcining modified sewage sludge group cuts down ammonia nitrogen effect and has notable difference (P < 0.05) between sand group and control group.
From fig. 4, it can be seen that compared with the control, covering bed mud to calcine the cover plate that modified sewage sludge particle makes as primary raw material
It is 64.71%~96.51% to orthophosphates reduction rate, mean value 86.41% illustrates that calcine modified sewage sludge particle be main
The active cover plate of raw material production can effectively control the release of bed mud orthophosphates；It is covered using the inertia that sand makes as primary raw material
Cover board is 23.88%~85.71% to orthophosphates reduction rate, and mean value 60.80% illustrates sand cover plate to sediment release
Orthophosphates also has certain control effect.Compare the modified dirty group of calcining and sand group, cover plate control bed mud orthophosphates can be obtained
Release is mainly the suction-operated of physics coverage and active material.Variance analysis shows purification plant sludge group, sand group and compares
Orthophosphates effect is cut down between group notable difference (P < 0.05).
In summary, it is known that calcine the bed mud covering that modified dirty particle, cement and flyash are primary raw material production
Plate can effectively control the release of substrate sludge nitrogen phosphorus.
Those of ordinary skill in the art still are able to it is found that when technical solution of the present invention changes in following ranges
To same as the previously described embodiments or similar technical effect:
A kind of preparation method of city river polluted bed mud activity cover plate, it includes the following steps:
(1) it collects purification plant sludge and sludge cake, temperature lower calcination 3.5-4.5h of the sludge cake at 380-450 DEG C, system is made
Obtain sludge bulking, it is preferable that sludge bulking is made in temperature lower calcination 3h of the sludge cake at 400 DEG C；
(2) sludge bulking is mechanically pulverized and mechanical concussion is sieved, the calcining modified sewage sludge that partial size is 1~5mm is made
Grain；
(3) will calcine modified sewage sludge particle, cement, 17~18 parts in proportion of flyash, 4~6 parts of cement, flyash 5~8
Part, water-cement ratio 0.26~0.29 is added blender and mixes, and can stir 2~3min mixing, can stand 5min makes aggregate and binder
It is sufficiently mixed；
(4) bottom material being stirred is added in framed and is suppressed, the pressing time is 60~80s, and the pressure of compacting is
0.75~0.8MPa；
(5) it is demoulded to obtain cover plate within 12~16 hours after molding to be pressed；
(6) covering board finished product is under natural open-air condition, 20~25 DEG C of temperature, stands 12-16 days (preferably, taking 14 days)
After can engineer application.
The above is only the preferred embodiment of the present invention, the range implemented of the present invention that therefore, it cannot be limited according to, i.e., according to
Equivalent changes and modifications made by the invention patent range and description, should still be within the scope of the present invention.
Claims (5)
1. a kind of preparation method of city river polluted bed mud activity cover plate, characterized by the following steps:
(1) it collects purification plant sludge and sludge cake is made, dirt is made in temperature lower calcination 3.5-4.5h of the sludge cake at 380-450 DEG C
Clod；
(2) sludge bulking is mechanically pulverized and mechanical concussion is sieved, the calcining modified sewage sludge particle that partial size is 1~5mm is made；
(3) will calcine modified sewage sludge particle, cement, 17~18 parts in proportion of flyash, 4~6 parts of cement, 5~8 parts of flyash,
Water-cement ratio 0.26~0.29 is added blender and mixes, and standing is sufficiently mixed aggregate and binder；
(4) bottom material being stirred being added in framed and is suppressed, the pressing time is 60~80s, the pressure of compacting is 0.75~
0.8MPa；
(5) it is demoulded to obtain cover plate within 12~16 hours after molding to be pressed；
(6) covering board finished product is under natural open-air condition, 20~25 DEG C of temperature, can engineer application after standing 12-16 days.
2. a kind of preparation method of city river polluted bed mud activity cover plate according to claim 1, it is characterised in that:
In the step (1), sludge bulking is made in temperature lower calcination 3h by the sludge cake at 400 DEG C.
3. a kind of preparation method of city river polluted bed mud activity cover plate according to claim 1, it is characterised in that:
2~3min is stirred in the step (3), in blender to mix.
4. a kind of preparation method of city river polluted bed mud activity cover plate according to claim 1, it is characterised in that:
In the step (3), standing 5min is sufficiently mixed aggregate and binder.
5. a kind of preparation method of city river polluted bed mud activity cover plate according to claim 1, it is characterised in that:
It, can engineer application after standing 14 days in the step (6).
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| CN114291986A (en) * | 2021-12-27 | 2022-04-08 | 华侨大学 | Preparation method of active covering plate for synchronously controlling release of nitrogen and phosphorus in sediment |
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| CN110152591B (en) | 2022-09-30 |
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