CN115521024B - Algae sludge on-line mechanical drying and residual water purifying system and method thereof - Google Patents
Algae sludge on-line mechanical drying and residual water purifying system and method thereof Download PDFInfo
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Classifications
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- 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
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- 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
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
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Abstract
The invention relates to an algae sludge on-line mechanical drying and residual water purifying system and a method thereof, which have the advantages of strong decontamination pertinence, comprehensive purification, low treatment cost and steady-state tail water discharge; according to different water pollution levels, different residual water deep purification process paths are selected, and meanwhile, the process has certain heavy metal removal capacity, and is wide in treatment coverage and low in cost. The whole water treatment process is divided into a primary materialization system, a secondary biochemical system and a tertiary purification system, and algae water and dredging mud are purified.
Description
Technical Field
The invention relates to the technical field of water body endogenous pollution treatment, in particular to an algae sludge on-line mechanical drying and residual water purifying system and a method thereof.
Background
Blue algae salvage and sediment ecological dredging aiming at reducing the endogenous pollution load are considered as one of engineering technical measures with obvious effect of controlling the endogenous pollution, and are widely applied to water environment treatment engineering of various places in recent years, and the comprehensive development of the blue algae salvage and dredging engineering leads to the transfer of a large amount of pollutants from underwater to shore in a short time, so that the targeted reduction treatment of algae water and mud under environmental stress becomes one of the key problems to be solved in water environment treatment engineering.
At present, the manner of treating algae water and dredging mud in the industry has the following defects:
The treatment capacity is small, and a large amount of algae mud and dredging mud are difficult to treat in time;
The fine-size silt particles in the dredging mud can be resuspended under hydrodynamic conditions, so that the water suspension content in the treatment station is high;
The treated tail water is easy to cause pollution transfer;
The pilot scale data is difficult to guide actual construction;
continuous full-load operation, large power consumption and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the inventor provides an on-line mechanical drying and residual water purifying system and method for algae sludge with reasonable structure, thereby simultaneously meeting the instant treatment requirements of blue algae and dredging mud.
The technical scheme adopted by the invention is as follows:
an on-line mechanical drying and residual water purifying method for algae sludge comprises the following steps:
primary physical and chemical treatment, mechanical dehydration of slurry and residual water purification;
The algae water and the slurry enter a mechanical separation deslagging system, impurities are primarily sieved under the synergistic effect of exciting force and gravity, and the residual algae water and slurry obtained after sieving enter a primary materialization treatment system to complete primary solid-liquid separation; and (3) discharging the separated supernatant after secondary biochemical or tertiary purification treatment according to the pollution degree, wherein the separated material of the primary physical and chemical treatment system enters a mechanical dehydration system to be dehydrated, formed algae and mud cakes are temporarily piled up, waiting for subsequent treatment, and the separated residual water enters a secondary biochemical system and a tertiary purification system to be discharged after purification.
As a further improvement of the above technical scheme:
The primary materialization process specifically comprises the following stages:
mechanical sorting deslagging stage:
The algae water and the slurry enter a mechanical separation deslagging system, impurities are primarily sieved through gravity action, and the residual algae water and slurry obtained after sieving enter a primary materialization treatment system;
And (3) strengthening treatment:
Common processing mode: the algae water and the mud flow into a sedimentation block of the thickening tank through a water distribution pipe, particles of the mixture of the algae water and the mud are subjected to an electric neutralization effect by virtue of the action of a coagulation medium in the sedimentation block, the attraction of mud components is accelerated, bridge blue algae cells form a copolymer with specific gravity greater than that of water, and the volume of the copolymer is increased under continuous collision and then is settled at the bottom of the thickening tank;
Fine particles which are easy to re-suspend are captured by a sedimentation well in the flowing process;
Pollutant particles with the smallest particle size enter an upward floating block of the thickening tank, and are combined with algae water and fine particle floating sludge through a water-gas mixture generated by a dissolved gas releaser under the action of a condensation medium to form a polymer with the density smaller than that of water, and the polymer floats on the water surface and is collected;
Classification collection mode: the slurry is conveyed to a sedimentation block of a thickening tank for sedimentation; the algae water is conveyed to an upward floating zone block of the thickening zone for thickening and decrement treatment.
The mechanical dehydration process of the slurry specifically comprises the following stages:
Dewatering slurry in a thickening tank:
The algae water and the slurry deposited in a sedimentation block of the thickening tank and a sedimentation well are input into a slurry bypass modification prefabrication system, the dehydration performance of the algae slurry is improved by adding medicines, and the improved algae slurry is conveyed to a plate-frame dehydration unit through a feeding system for dehydration and filter pressing; the clarified water in the slurry bypass prefabrication system overflows into a tail water adjusting tank;
The algae residue in the upper floating zone of the thickening tank is collected to a conditioning tank, and after the concentration in the conditioning tank is balanced, the algae residue enters a belt filter press to be dehydrated and filter-pressed;
slurry dehydration of a secondary sedimentation tank:
The activated sludge in the secondary sedimentation tank connected with the contact fluidization tank is conveyed to a conditioning tank, and after the concentration in the conditioning tank is balanced, the activated sludge enters a belt filter press to carry out dehydration and filter pressing;
Tail mud collection:
And temporarily stacking the tail mud obtained by the dehydration and filter pressing to wait for subsequent treatment, and enabling the obtained residual water to enter a tail water regulating tank to balance the water quality and the water quantity.
The secondary biochemical process specifically comprises the following stages:
tail water regulating tank treatment stage:
the filtered water which does not reach the standard after being treated by the rapid filter tank enters a tail water adjusting tank together with the water outlet of the slurry bypass modification prefabrication system and the water outlet of the mechanical dehydration equipment, the water quality and the water quantity are balanced in the tank,
And (3) a pool treatment stage:
The effluent of the tail water regulating tank enters the tank A for treatment, and the denitrifying bacteria cultivated in the tank are utilized to reduce nitrate nitrogen into N2 for release by taking degradable organic matters in the water as electron donors and nitrate as electron acceptors, so that the purposes of denitrification and COD reduction are achieved;
Contact fluidization pool treatment stage:
The effluent of the pool A enters a contact fluidization pool for treatment, suspended biological film carriers are in a uniform fluidization state in the whole pool in the aeration process in the pool, nitrifying bacteria are attached to the suspended biological film carriers, oxygen is used as a final electron acceptor in the fluidization state, NH4 + is oxidized into NO 3 -, part of the effluent of the contact fluidization pool is used as nitrifying liquid to flow back to the pool A for further denitrification, and the other part of the effluent enters a secondary sedimentation pool for sedimentation.
The residual water purification process specifically comprises the following stages:
And (3) a filtering stage:
The effluent of the primary physical and chemical treatment system enters a rapid filter for filtration, if the filtered water reaches the standard, the filtered water enters an ecological purification tank, and the backwash water of the rapid filter returns to a floating block on a thickening tank;
filtration stage of the percolation dam:
the activated sludge deposited in the secondary sedimentation tank is collected to a sludge treatment system for treatment, and the effluent enters an ecological purification tank after being filtered by a percolation dam;
ecological purification pond treatment stage:
Through photosynthesis and root adsorption of submerged plants, dissolved oxygen and transparency of tail water are improved.
And subsurface flow agitators are arranged in the pool A at intervals and used for pushing denitrifying bacteria to move in the pool so as to contact more nutrient salt substances.
The dehydration process of the plate frame dehydrator is as follows:
During the early feeding, a slurry pump and a plunger pump are combined into a single feeding system to feed the plate frame dehydrator; an electromagnetic flowmeter is arranged on the feeding system and the plate frame squeezing water outlet header pipe to collect and monitor the feeding and water outlet flow;
When the water flow reaches the maximum value and gradually decreases to the maximum flow of the slurry pump, the plunger pump is closed, and the slurry pump is used for independent feeding;
when the water outlet flow is smaller than the rated flow of the plunger pump, the plunger pump is started until the plunger pump stably operates, the slurry pump is closed, the pressure of the plunger pump is increased, and mud cakes are dried.
The effective depth of the sedimentation well is more than or equal to 3m, and the pool length of a thickening pool provided with the sedimentation well is more than 40m.
An algae sludge on-line mechanical drying and residual water purifying system for an algae sludge on-line mechanical drying and residual water purifying method comprises the following steps:
a mechanical sorting and deslagging system,
The water outlet direction of the mechanical separation deslagging system is connected with a thickening tank which is divided into: a sedimentation block and an upper floating block; a sedimentation well is arranged at the tail end of the sedimentation block of the thickening tank,
A sedimentation block of the thickening tank and a discharge direction of the sedimentation well are connected with a slurry bypass modification prefabrication system, and a tail water regulating tank is connected in a water outlet direction of the slurry bypass modification prefabrication system;
the discharging direction of the upper floating zone block of the thickening tank is connected with a conditioning tank, the discharging direction of the conditioning tank is connected with mechanical dehydration equipment, and the water outlet direction of the mechanical dehydration equipment is connected to a tail water regulating tank;
the water outlet direction of the upper floating block of the thickening tank is connected to the rapid filter, the water outlet direction of backwash water of the rapid filter is connected to the upper floating block of the thickening tank, the water filtering direction of the rapid filter is connected to the tail water regulating tank/ecological purifying tank, the water outlet of the ecological purifying tank is discharged to the external environment,
The water outlet direction of the tail water adjusting tank is sequentially connected with: a pool A, a contact fluidization pool, a secondary sedimentation pool and an ecological purifying pool;
The discharging direction of the secondary sedimentation tank is connected with a conditioning tank, the discharging direction of the conditioning tank is connected with a mechanical dehydration device, and the water outlet direction of the mechanical dehydration device is connected to a tail water regulating tank.
As a further improvement of the above technical scheme:
The slurry bypass modification prefabrication system adopts a conical tank body, a water inlet pipe is arranged in the center of the tank body, and flocculating agents are added to assist sedimentation when algae water and slurry enter the tank body; a baffle is arranged in the slurry bypass modification prefabrication system, and algae water and slurry in the water inlet pipe flow through the baffle and fall into the tank bottom.
The beneficial effects of the invention are as follows:
The invention can realize the common collection and classified collection of algae water and dredging mud according to the requirements, effectively improves the collection efficiency of pollutants, and solves the problems of insufficient hydraulic retention time, overhigh suspended matters of discharged water and the like caused by insufficient construction land.
The algae water treatment and emergency dredging are carried out together, the algae and sludge can be collected together, the aggregation medium is utilized to promote algae water and sludge particles to form a copolymer and gradually grow and sink in the process, and the copolymer is enriched at the bottom of a sedimentation block of a thickening tank. In the classified collection of the invention, the characteristics of the sludge and the algae are utilized to respectively carry out dense collection on a sedimentation block and an upward floating block; the commonality of the specific gravity difference of the algae and silt mixture overcomes the difficulty that silt particles and blue algae cannot be collected simultaneously due to the specific gravity characteristics.
According to the invention, the sedimentation wells are arranged in the water flow direction of the sedimentation block of the material collecting tank and at the bottom of the tail end, so that local ultra-deep is increased, the loss of hydrodynamic conditions of silt fine particles falling into the wells or grooves is promoted, the silt fine particles are gradually enriched in the wells, and the pollution enrichment efficiency is effectively improved by slowly compacting under the action of gravity. Meanwhile, the upper floating zone block of the thickening tank can further carry out flotation collection on the silt fine particles and blue algae of the part which is not effectively precipitated due to insufficient residence time in the prior precipitation zone block process, so that the water body is further clarified.
The invention provides a buffer zone for the change of the mud property, concentration and flow by using a slurry bypass modification prefabrication method, and provides a space for immediate adjustment, so that the grading distribution and dehydration performance of algae and silt particle diameters are fully optimized before entering mechanical dehydration equipment, thereby improving the stability of the mechanical dehydration process.
The invention optimizes the feeding mode of the plate frame, reduces the treatment cost and improves the treatment efficiency; in the earlier stage of feeding, the filling time of the filter chamber is quickened, the unbalanced relation between the power consumption of the feeding pump and the filtering flow is coordinated in the middle and the later stages of feeding, the later stage squeezing pressure is improved, and the optimal configuration and combination mode of the feeding pump are matched under the gradient change of the filtering flow of a plate and frame dehydration system. The system adopts a single-set feeding system to match the work of a plurality of platen frames, the single-set feeding system consists of a slurry pump and a plunger pump, and the filling time of a filter chamber at the early stage of feeding is shortened, the feeding flow at the middle and later stages of feeding is reduced, and the filtering pressure is increased by utilizing the high flow of the slurry pump and the low power consumption and high pressure of the plunger pump. The full cycle working time of the plate frame is effectively shortened, the plate frame squeezing efficiency is improved, the solid content of mud cakes is improved, the equipment power consumption is reduced, and the cost is saved. The two pumps are combined in a complete set, so that the shutdown phenomenon caused by the replacement of vulnerable parts of the pump body can be effectively avoided, and the operation stability is improved.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the on-line mechanical drying and residual water purifying method for algae sludge in this embodiment includes the following steps:
primary physical and chemical treatment, mechanical dehydration of slurry and residual water purification;
The algae water and the slurry enter a mechanical separation deslagging system, impurities are primarily sieved under the synergistic effect of exciting force and gravity, and the residual algae water and slurry obtained after sieving enter a primary materialization treatment system to complete primary solid-liquid separation; and (3) discharging the separated supernatant after secondary biochemical or tertiary purification treatment according to the pollution degree, wherein the separated material of the primary physical and chemical treatment system enters a mechanical dehydration system to be dehydrated, formed algae and mud cakes are temporarily piled up, waiting for subsequent treatment, and the separated residual water enters a secondary biochemical system and a tertiary purification system to be discharged after purification.
The primary materialization process specifically comprises the following stages:
mechanical sorting deslagging stage:
The algae water and the slurry enter a mechanical separation deslagging system, impurities are primarily sieved through gravity action, and the residual algae water and slurry obtained after sieving enter a primary materialization treatment system;
And (3) strengthening treatment:
Common processing mode: the algae water and the mud flow into a sedimentation block of the thickening tank through a water distribution pipe, particles of the mixture of the algae water and the mud are subjected to an electric neutralization effect by virtue of the action of a coagulation medium in the sedimentation block, the attraction of mud components is accelerated, bridge blue algae cells form a copolymer with specific gravity greater than that of water, and the volume of the copolymer is increased under continuous collision and then is settled at the bottom of the thickening tank;
Fine particles which are easy to re-suspend are captured by a sedimentation well in the flowing process;
Pollutant particles with the smallest particle size enter an upward floating block of the thickening tank, and are combined with algae water and fine particle floating sludge through a water-gas mixture generated by a dissolved gas releaser under the action of a condensation medium to form a polymer with the density smaller than that of water, and the polymer floats on the water surface and is collected;
Classification collection mode: the slurry is conveyed to a sedimentation block of a thickening tank for sedimentation; the algae water is conveyed to an upward floating zone block of the thickening zone for thickening and decrement treatment.
The mechanical dehydration process of the slurry specifically comprises the following stages:
Dewatering slurry in a thickening tank:
The algae water and the slurry deposited in a sedimentation block of the thickening tank and a sedimentation well are input into a slurry bypass modification prefabrication system, the dehydration performance of the algae slurry is improved by adding medicines, and the improved algae slurry is conveyed to a plate-frame dehydration unit through a feeding system for dehydration and filter pressing; the clarified water in the slurry bypass prefabrication system overflows into a tail water adjusting tank;
The algae residue in the upper floating zone of the thickening tank is collected to a conditioning tank, and after the concentration in the conditioning tank is balanced, the algae residue enters a belt filter press to be dehydrated and filter-pressed;
slurry dehydration of a secondary sedimentation tank:
The activated sludge in the secondary sedimentation tank connected with the contact fluidization tank is conveyed to a conditioning tank, and after the concentration in the conditioning tank is balanced, the activated sludge enters a belt filter press to carry out dehydration and filter pressing;
Tail mud collection:
And temporarily stacking the tail mud obtained by the dehydration and filter pressing to wait for subsequent treatment, and enabling the obtained residual water to enter a tail water regulating tank to balance the water quality and the water quantity.
The secondary biochemical process specifically comprises the following stages:
tail water regulating tank treatment stage:
the filtered water which does not reach the standard after being treated by the rapid filter tank enters a tail water adjusting tank together with the water outlet of the slurry bypass modification prefabrication system and the water outlet of the mechanical dehydration equipment, the water quality and the water quantity are balanced in the tank,
And (3) a pool treatment stage:
The effluent of the tail water regulating tank enters the tank A for treatment, and the denitrifying bacteria cultivated in the tank are utilized to reduce nitrate nitrogen into N2 for release by taking degradable organic matters in the water as electron donors and nitrate as electron acceptors, so that the purposes of denitrification and COD reduction are achieved;
Contact fluidization pool treatment stage:
The effluent of the pool A enters a contact fluidization pool for treatment, suspended biological film carriers are in a uniform fluidization state in the whole pool in the aeration process in the pool, nitrifying bacteria are attached to the suspended biological film carriers, oxygen is used as a final electron acceptor in the fluidization state, NH4 + is oxidized into NO 3 -, part of the effluent of the contact fluidization pool is used as nitrifying liquid to flow back to the pool A for further denitrification, and the other part of the effluent enters a secondary sedimentation pool for sedimentation.
The residual water purification process specifically comprises the following stages:
And (3) a filtering stage:
The effluent of the primary physical and chemical treatment system enters a rapid filter for filtration, if the filtered water reaches the standard, the filtered water enters an ecological purification tank, and the backwash water of the rapid filter returns to a floating block on a thickening tank;
filtration stage of the percolation dam:
the activated sludge deposited in the secondary sedimentation tank is collected to a sludge treatment system for treatment, and the effluent enters an ecological purification tank after being filtered by a percolation dam;
ecological purification pond treatment stage:
Through photosynthesis and root adsorption of submerged plants, dissolved oxygen and transparency of tail water are improved.
And subsurface flow agitators are arranged in the pool A at intervals and used for pushing denitrifying bacteria to move in the pool so as to contact more nutrient salt substances.
The dehydration process of the plate frame dehydrator is as follows:
During the early feeding, a slurry pump and a plunger pump are combined into a single feeding system to feed the plate frame dehydrator; an electromagnetic flowmeter is arranged on the feeding system and the plate frame squeezing water outlet header pipe to collect and monitor the feeding and water outlet flow;
When the water flow reaches the maximum value and gradually decreases to the maximum flow of the slurry pump, the plunger pump is closed, and the slurry pump is used for independent feeding;
when the water outlet flow is smaller than the rated flow of the plunger pump, the plunger pump is started until the plunger pump stably operates, the slurry pump is closed, the pressure of the plunger pump is increased, and mud cakes are dried.
The effective depth of the sedimentation well is more than or equal to 3m, and the pool length of a thickening pool provided with the sedimentation well is more than 40m.
The algae-sludge on-line mechanical drying and residual water purifying system used in the algae-sludge on-line mechanical drying and residual water purifying method of the embodiment comprises:
a mechanical sorting and deslagging system,
The water outlet direction of the mechanical separation deslagging system is connected with a thickening tank which is divided into: a sedimentation block and an upper floating block; a sedimentation well is arranged at the tail end of the sedimentation block of the thickening tank,
A sedimentation block of the thickening tank and a discharge direction of the sedimentation well are connected with a slurry bypass modification prefabrication system, and a tail water regulating tank is connected in a water outlet direction of the slurry bypass modification prefabrication system;
the discharging direction of the upper floating zone block of the thickening tank is connected with a conditioning tank, the discharging direction of the conditioning tank is connected with mechanical dehydration equipment, and the water outlet direction of the mechanical dehydration equipment is connected to a tail water regulating tank;
the water outlet direction of the upper floating block of the thickening tank is connected to the rapid filter, the water outlet direction of backwash water of the rapid filter is connected to the upper floating block of the thickening tank, the water filtering direction of the rapid filter is connected to the tail water regulating tank/ecological purifying tank, the water outlet of the ecological purifying tank is discharged to the external environment,
The water outlet direction of the tail water adjusting tank is sequentially connected with: a pool A, a contact fluidization pool, a secondary sedimentation pool and an ecological purifying pool;
The discharging direction of the secondary sedimentation tank is connected with a conditioning tank, the discharging direction of the conditioning tank is connected with a mechanical dehydration device, and the water outlet direction of the mechanical dehydration device is connected to a tail water regulating tank.
The slurry bypass modification prefabrication system adopts a conical tank body, a water inlet pipe is arranged in the center of the tank body, and flocculating agents are added to assist sedimentation when algae water and slurry enter the tank body; a baffle is arranged in the slurry bypass modification prefabrication system, and algae water and slurry in the water inlet pipe flow through the baffle and fall into the tank bottom.
In the above process, the improvement of the dehydration property is specifically explained as follows: the dehydration performance improvement is realized by adding chemicals through a pipeline before the slurry bypass modification prefabrication system is input, the algae water and the slurry can destroy the original colloid steady-state structure after being added with the chemicals, and the pollutants are promoted to be condensed, and the condensation process is called the dehydration performance improvement, namely the modification.
The algae residues in the floating area of the thickening tank are collected into a conditioning tank, and after the concentration is balanced in the conditioning tank, the specific explanation of the balanced concentration is as follows: because concentration fluctuation of algae residues in a floating area on the thickening tank inevitably occurs in the collecting process, an equilibrium concentration process is inevitably generated, and the equilibrium concentration is a natural mixing process of high-concentration algae residues and low-concentration algae residues in the conditioning tank, and no additional operation is needed in the process.
In this embodiment, the common processing mode is equivalent to the common collection mode. The classification collection mode and the co-processing or collection mode are two embodiments of the process of the present invention that are freely switchable. The two collection modes are mainly set to meet the collection requirement of the process tail mud on the follow-up treatment of mud cakes; if the dehydrated sludge needs to be recycled in the building material direction, the subsequent disposal and utilization are affected due to the higher content of organic matters such as algae and floating sludge in the tail sludge, so that the sludge is collected in a classifying way, and algae are collected in the algae way; likewise, if the resource utilization of the greening nutrient soil is carried out later, the organic matter content of the tail mud needs to be improved, and then the common treatment mode can be used.
The dredging mud is mud formed by a dredging ship in the dredging construction process. The slurry has a high water content, which results in a huge volume, and therefore, it is necessary to perform a reduction and harmless treatment. The treatment object of the process is mud formed by dredging, namely the invention aims at treating the dredging mud.
The specific purification process of this example is as follows:
The whole process firstly divides the treatment objects of the subsequent process through a primary materialization system, namely a thickening tank, namely algae water and slurry are divided into two parts of slurry and water, the concentration of residual water suspended matters formed in the primary system is higher, and if the water quality is better, suspended matters are filtered out through a rapid filter tank and then enter an ecological purifying tank; if the solubility COD and ammonia nitrogen in the water body are higher than the emission requirements, the secondary biochemical treatment is needed to be further carried out, and at the moment, suspended matters are filtered out by the rapid filter tank and then enter the tail water regulating tank, because the main function of the tail water regulating tank is to regulate the fluctuation of the quality and quantity of water to be treated, the concentration of the suspended matters in the water is required, and the concentration cannot be too high, so that the biological membrane of a biochemical treatment system is prevented from being polluted.
The tail water regulating tank is a subsequent structure of the rapid filter tank in the three-stage purification system, which does not reach the standard for yielding water; the effluent of the tail water regulating tank enters a secondary biochemical system; the method has no direct relation with a primary materialization system, a percolation dam and an ecological purification tank.
The specific operation steps of this embodiment are as follows:
The algae water and the slurry enter a mechanical separation deslagging system, and the separation procedure classifies and collects different kinds of impurities under the action of gravity by means of exciting forces given to screens with different apertures, so that the recycling after resource differentiation is facilitated. The residual algae and the sludge enter a primary materialization treatment system.
In the primary strengthening treatment process:
in the common processing mode of operation,
The algae-sludge mixture flows into a precipitation block of the thickening tank through a water distribution pipe, algae water and sludge particles are subjected to an electric neutralization effect by means of the action of a coagulation medium, free particles directly capture negative charges carried by colloid of the sludge particles and the surfaces of blue algae cells, and the Zeta potential of a colloid dispersion system is reduced, so that the hydration film adsorbed on the surfaces of the particles is damaged to destabilize the potential of each phase of particle colloid, the slurry component is accelerated to attract, and bridge blue algae cells form a copolymer with specific gravity greater than that of water, so that the volume of the copolymer is increased under continuous collision, and finally sedimentation and enrichment are carried out at the bottom of the tank under the action of gravity.
A part of algae sludge particles with smaller particle size and difficult to precipitate are captured by a deposition well arranged at the bottom of the tail end in the water flow direction of the precipitation block; in the embodiment, the pool length is more than 40m, a deposition well is required to be arranged, the size of the deposition well is determined according to the site condition, and the effective depth is not less than 3m; the other part of ultrafine particles enter an upward floating block of the thickening tank, the water-air mixture generated by the dissolved air releaser under the action of the coagulation medium is combined with algae water and fine particle floating sludge to form a polymer with the density smaller than that of water, and the polymer continuously floats to the water surface and is collected in a concentrated way, so that the aim of further clarifying the water quality is fulfilled.
In the classified collection mode, the dredging slurry is conveyed to a sedimentation block of a thickening tank for sedimentation, and light fine particle sludge enters a floating block on a later path for flotation thickening; the algae water is conveyed to an upward floating block of the thickening tank to be directly thickened.
In the stage of mechanical dehydration of the material,
The first procedure: the algae and sludge mixture deposited at the bottom of the sedimentation block of the thickening tank and the sedimentation well is sucked to a slurry bypass modification prefabrication system through a moving platform. The system is a deep conical tank body, slurry enters the tank from top to bottom through a water inlet pipe arranged in the center of the tank, flocculant is added in the process, a baffle is arranged below a central pipe to enable the slurry to slowly rise along the whole water cross section after being uniformly distributed in the tank body, algae-sludge mixture is fully mixed and then is settled into a conical sludge settling hopper at the bottom of the tank, and clarified water flows out from the periphery of the upper part of the tank body to a tail water regulating tank along a peripheral overflow weir.
The algae slurry with improved dehydration performance is conveyed to a plate-frame dehydration unit for dehydration through a feeding system. The following is an illustration in actual case:
A single feeding system is composed of a slurry pump of 140m 3/h and 75KW, a plunger pump of 70m 3/h and 37KW, and 4 600 flat-plate frame filter presses are fed. An electromagnetic flowmeter is arranged on the feeding system and the plate frame squeezing water outlet header pipe to collect and monitor the feeding and water outlet flow.
The slurry pump and the plunger pump are adopted for feeding at the same time under 0.8Mpa, so that the full-bin time of the filter chamber is shortened;
when the water flow reaches the maximum value and gradually decreases to the full rated flow of the slurry pump, the plunger pump is closed, and the slurry pump is used for independent feeding;
When the water flow is smaller than the rated flow of the plunger pump, the plunger pump is started until the plunger pump stably operates, the slurry pump is closed, and the pressure of the plunger pump is increased to 1Mpa to dry the mud cake.
In the actual use process, the optimal quantity matching can be carried out according to the capability and the power consumption of the feeding system and the specification size of the plate frame machine. Such as 2 slurry pumps and 1 plunger pump to form a single feeding system, and 6 600 plate-and-frame filter presses are matched.
And a second procedure: after the algae residues on the surface layer of the upper floating block are collected to the equilibrium concentration of the conditioning tank, the algae residues are fed into respective mechanical dewatering equipment on line through a pipeline for dewatering and pressure filtration, wherein the mechanical dewatering equipment is a belt type pressure filtration unit.
And a third procedure: and after the activated sludge deposited in the secondary sedimentation tank is conveyed to the conditioning tank for equalizing the concentration, the activated sludge is fed into the mechanical dewatering equipment on line through a pipeline for dewatering and pressure filtration, wherein the mechanical dewatering equipment is a belt type pressure filtration unit.
Tail mud generated in the three procedures is conveyed to a temporary storage yard through a belt conveyor for subsequent treatment, and the generated residual water enters a tail water regulating tank to balance water quality and water quantity.
In the residual water purification process:
Under the condition that the effluent of the thickening tank can basically reach the standard, the sewage firstly enters a rapid filter tank for filtration, and a filtering layer is formed by grading granular filter materials such as quartz sand, volcanic rock and the like, so that suspended solids, part of pollutants such as bacteria, microorganisms and the like in the sewage are rapidly trapped. The back flushing water of the rapid filter tank returns to the floating block of the dense tank, the filtered water of the rapid filter tank enters the ecological purification tank, the dissolved oxygen and transparency of the tail water are improved through photosynthesis and root adsorption of submerged plants, the clear water steady state of the tail water is maintained, and the deep purification is completed.
Under the condition that the effluent of the dense pool can not reach the standard, biochemical treatment is needed: firstly, suspended matters are filtered by a rapid filter tank, and then enter a tail water adjusting tank together with the effluent of a slurry bypass modification prefabrication system, the effluent of a plate-and-frame filter press machine and the effluent of a belt filter press, so that the water quality and the water quantity are balanced in the tank, and the pollution load resistance of a water treatment system is improved.
The effluent of the regulating tank firstly enters the tank A, the retention time of the tank A is generally 2 to 3.5 hours, the effective depth is not less than 4m,
A pool is internally provided with a circular ball body made of polypropylene material by injection molding, volcanic rock filler is arranged in the pool for film formation, degradable organic matters in tail water are used as electron donors by means of denitrifying bacteria cultivated on the filler, nitrate is used as an electron acceptor, nitrate nitrogen is reduced into N2 to be released, the purposes of denitrification and COD reduction are achieved, and meanwhile, a submerged flow stirrer is arranged in the area with the interval of 5m of the inner circumference of the pool and used for pushing the ball body to move in the pool so as to contact more nutrient salt substances.
The effluent of the pool A enters a contact fluidization pool, the contact fluidization pool adopts a mode of combining activated sludge, a biological film and contact oxidation, a suspended biological film carrier put in a system is utilized in the aeration process to enable the whole pool to be in a uniform fluidization state, the cultured autotrophic nitrifying bacteria are attached to the suspended biological film carrier, oxygen is used as a final electron acceptor in the fluidization state, NH4 < + > is oxidized into NO3 < - >, one part of effluent of the contact fluidization pool is used as nitrifying liquid to flow back to the pool A to complete further denitrification, and the other part of effluent enters a secondary sedimentation pool to be precipitated.
The secondary sedimentation tank is an auxiliary structure for contacting the fluidization tank, is an important component of a biochemical treatment system, and has the functions of clarifying mixed liquid, partially recycling and concentrating activated sludge.
The activated sludge deposited in the tank is collected to a sludge treatment system for treatment, and the effluent enters an ecological purification tank after being treated by a percolation dam. The percolation dam is a functional structure which is formed by taking ceramsite and volcanic rock as matrixes and is used for blocking two pond bodies and playing a role in purifying water, the section of the percolation dam is divided into a percolation area and a surface flow area from bottom to top, and emergent aquatic plants are planted in the surface flow area; the seepage and gauge flows must not be less than the treated water. The water quality is purified and maintained through the triple synergistic effects of physical, chemical and biological of microorganisms formed by the aquatic plants in the surface flow area and the film hanging in the seepage area, such as adsorption, retention, filtration, oxidation reduction, precipitation, microbial decomposition, conversion, plant shielding, residue accumulation, nutrient absorption and the like on the water discharged from the secondary biochemical treatment system.
The effluent of the percolation dam enters an ecological purification tank, and through photosynthesis and root adsorption of submerged plants, dissolved oxygen and transparency of tail water are improved, clear water steady state of the tail water is maintained, and deep purification is completed.
The invention has strong decontamination pertinence, comprehensive purification, low treatment cost and steady-state tail water discharge; according to different water pollution levels, different residual water deep purification process paths are selected, and meanwhile, the process has certain heavy metal removal capacity, and is wide in treatment coverage and low in cost. The whole water treatment process is divided into a primary materialization system, a secondary biochemical system and a tertiary purification system, and algae water and dredging mud are purified.
The dredging mud or algae water with lower pollution degree directly enters the three-stage purification system for deep purification after the strengthening treatment of the primary materialization system, so that on one hand, the water treatment cost is reduced, and on the other hand, the impact of the water body with low pollution load on the secondary biochemical system is also reduced. Under the condition that the primary physicochemical system cannot reach the standard for treatment, the system effluent and the residual water of the sludge treatment system enter a secondary biochemical system for dephosphorization and denitrification.
The secondary biochemical treatment system adopts a mode of combining activated sludge, biological membranes and contact oxidation, utilizes a suspended biological membrane carrier which is put in the system and has a specific gravity (0.945-0.965 g/cm < 3 >) close to that of water, a hollow three-dimensional structure and a rough inner surface to attach to the biological membranes cultured in situ, and respectively realizes the uniform fluidization state of the suspended biological membrane carrier in different tanks by aeration through a submerged mixer, so that nitrification and denitrification can be fully carried out, and the efficiency and the standard reaching rate of tail water treatment are greatly improved. And because the suspended biological membrane carrier is made of HDPE, the durability is strong, the suspended biological membrane carrier can be recycled, and the suspended biological membrane carrier is different from the defects of shorter service cycle, high price and the like of the traditional membrane-hanging material, so that the suspended biological membrane carrier has lower ton water treatment cost and better economy.
The three-stage purification system mainly relies on physical, chemical and biological actions to realize deep purification of the water body, and has extremely low running cost. The rapid filter chamber contained in the system removes impurities and suspended matters in the effluent of the primary physicochemical treatment system through the adsorption effect of the filter material, reduces the turbidity of the effluent, improves the safety and treatment efficiency of subsequent treatment facilities, reduces the content of organic matters in the effluent to a certain extent, and has a certain removal rate for heavy metals, bacteria and viruses; the percolation dam of the system utilizes the physical, chemical and biological synergistic effects of matrix, aquatic plants and microorganisms to provide the effects of adsorption, retention, filtration, oxidation reduction, precipitation, microbial decomposition, conversion, plant shielding, residue accumulation, nutrient absorption and the like for the effluent of the secondary biochemical treatment system; the ecological purifying pond in the system utilizes photosynthesis and root system adsorption of submerged plant to raise the dissolved oxygen and transparency of tail water and maintain the clear water stable state of tail water.
By taking blue algae in a Taihu water area and a water area as an example, the invention realizes the fusion of different treatment processes of algae water and dredging slurry, judges that the risk of water pollution events such as lake flooding and the like in a blue algae accumulation area is obviously higher than that in other areas on the basis of the treatment experience of endogenous pollution in the Taihu water area, and enables treatment stations of the algae accumulation area and the dredging slurry to be planned in one place under the process fusion, thereby unifying the functions of construction land, saving the land area, and greatly improving the blue algae treatment capacity by depending on the dredging treatment scale. In addition, the technology micro-polluted residual water is effectively subjected to advanced treatment, so that the pollutants in the whole set of technology are realized: the full coverage treatment of algae, silt and water truly achieves the deep reduction of endogenous pollution.
The above description is intended to illustrate the invention and not to limit it, the scope of which is defined by the claims, and any modifications can be made within the scope of the invention.
Claims (9)
1. The on-line mechanical drying and residual water purifying method for algae sludge is characterized by comprising the following steps:
primary physical and chemical treatment, mechanical dehydration of slurry and residual water purification;
The algae water and the slurry enter a mechanical separation deslagging system, impurities are primarily sieved under the synergistic effect of exciting force and gravity, and the residual algae water and slurry obtained after sieving enter a primary materialization treatment system to complete primary solid-liquid separation; the separated supernatant is discharged after secondary biochemical or tertiary purification treatment according to the pollution degree, the materials separated by the primary physical and chemical treatment system enter a mechanical dehydration system to be dehydrated, formed algae and mud cakes are temporarily piled up, the subsequent treatment is waited, and the separated residual water enters a secondary biochemical system and a tertiary purification system to be discharged after purification;
The primary materialization process specifically comprises the following stages:
mechanical sorting deslagging stage:
The algae water and the slurry enter a mechanical separation deslagging system, impurities are primarily sieved through gravity action, and the residual algae water and slurry obtained after sieving enter a primary materialization treatment system;
And (3) strengthening treatment:
Common processing mode: the algae water and the mud flow into a sedimentation block of the thickening tank through a water distribution pipe, particles of the mixture of the algae water and the mud are subjected to an electric neutralization effect by virtue of the action of a coagulation medium in the sedimentation block, the attraction of mud components is accelerated, bridge blue algae cells form a copolymer with specific gravity greater than that of water, and the volume of the copolymer is increased under continuous collision and then is settled at the bottom of the thickening tank;
Fine particles which are easy to re-suspend are captured by a sedimentation well in the flowing process;
Pollutant particles with the smallest particle size enter an upward floating block of the thickening tank, and are combined with algae water and fine particle floating sludge through a water-gas mixture generated by a dissolved gas releaser under the action of a condensation medium to form a polymer with the density smaller than that of water, and the polymer floats on the water surface and is collected;
Classification collection mode: the slurry is conveyed to a sedimentation block of a thickening tank for sedimentation; the algae water is conveyed to an upward floating zone block of the thickening zone for thickening and decrement treatment.
2. The on-line mechanical drying and residual water purifying method of algae sludge according to claim 1, wherein: the mechanical dehydration process of the slurry specifically comprises the following stages:
Dewatering slurry in a thickening tank:
The algae water and the slurry deposited in a sedimentation block of the thickening tank and a sedimentation well are input into a slurry bypass modification prefabrication system, the dehydration performance of the algae slurry is improved by adding medicines, and the improved algae slurry is conveyed to a plate-frame dehydration unit through a feeding system for dehydration and filter pressing; the clarified water in the slurry bypass modification prefabrication system overflows into a tail water regulating tank;
The algae residue in the upper floating zone of the thickening tank is collected to a conditioning tank, and after the concentration in the conditioning tank is balanced, the algae residue enters a belt filter press to be dehydrated and filter-pressed;
slurry dehydration of a secondary sedimentation tank:
The activated sludge in the secondary sedimentation tank connected with the contact fluidization tank is conveyed to a conditioning tank, and after the concentration in the conditioning tank is balanced, the activated sludge enters a belt filter press to carry out dehydration and filter pressing;
Tail mud collection:
And temporarily stacking the tail mud obtained by the dehydration and filter pressing to wait for subsequent treatment, and enabling the obtained residual water to enter a tail water regulating tank to balance the water quality and the water quantity.
3. The on-line mechanical drying and residual water purifying method of algae sludge according to claim 1, wherein: the secondary biochemical process specifically comprises the following stages:
tail water regulating tank treatment stage:
the filtered water which does not reach the standard after being treated by the rapid filter tank enters a tail water adjusting tank together with the water outlet of the slurry bypass modification prefabrication system and the water outlet of the mechanical dehydration equipment, the water quality and the water quantity are balanced in the tank,
And (3) a pool treatment stage:
The effluent of the tail water regulating tank enters a tank A for treatment, degradable organic matters in the water are used as electron donors, nitrate is used as an electron acceptor, nitrate nitrogen is reduced into N 2 for release, and the purposes of denitrification and COD reduction are achieved;
Contact fluidization pool treatment stage:
The effluent of the pool A enters a contact fluidization pool for treatment, in the aeration process in the pool, suspended biological film carriers are in a uniform fluidization state in the whole pool, nitrifying bacteria are attached to the suspended biological film carriers, oxygen is used as a final electron acceptor in the fluidization state, NH 4 + is oxidized into NO 3 -, part of the effluent of the contact fluidization pool is used as nitrifying liquid to flow back to the pool A for further denitrification, and the other part of the effluent enters a secondary sedimentation pool for sedimentation.
4. The on-line mechanical drying and residual water purifying method of algae sludge according to claim 1, wherein: the residual water purification process specifically comprises the following stages:
And (3) a filtering stage:
The effluent of the primary physical and chemical treatment system enters a rapid filter for filtration, if the filtered water reaches the standard, the filtered water enters an ecological purification tank, and the backwash water of the rapid filter returns to a floating block on a thickening tank;
filtration stage of the percolation dam:
the activated sludge deposited in the secondary sedimentation tank is collected to a sludge treatment system for treatment, and the effluent enters an ecological purification tank after being filtered by a percolation dam;
ecological purification pond treatment stage:
Through photosynthesis and root adsorption of submerged plants, dissolved oxygen and transparency of tail water are improved.
5. The on-line mechanical drying and residual water purifying method of algae sludge according to claim 3, wherein: and subsurface flow agitators are arranged in the pool A at intervals and used for pushing denitrifying bacteria to move in the pool so as to contact more nutrient salt substances.
6. The on-line mechanical drying and residual water purifying method of algae sludge according to claim 2, wherein: the dehydration process of the plate frame dehydrator is as follows:
During the early feeding, a slurry pump and a plunger pump are combined into a single feeding system to feed the plate frame dehydrator; an electromagnetic flowmeter is arranged on the feeding system and the plate frame squeezing water outlet header pipe to collect and monitor the feeding and water outlet flow;
When the water flow reaches the maximum value and gradually decreases to the maximum flow of the slurry pump, the plunger pump is closed, and the slurry pump is used for independent feeding;
When the water outlet flow is smaller than the rated flow of the plunger pump, the plunger pump is started until the plunger pump stably operates, the slurry pump is closed, the pressure of the plunger pump is increased, and the mud cake is dried.
7. The on-line mechanical drying and residual water purifying method of algae sludge according to claim 1, wherein: the effective depth of the sedimentation well is more than or equal to 3m, and the pool length of a thickening pool provided with the sedimentation well is more than 40m.
8. An on-line mechanical drying and residual water purifying system for algae sludge in the on-line mechanical drying and residual water purifying method of claim 1, comprising:
a mechanical sorting and deslagging system,
The water outlet direction of the mechanical separation deslagging system is connected with a thickening tank which is divided into: a sedimentation block and an upper floating block; a sedimentation well is arranged at the tail end of the sedimentation block of the thickening tank,
A sedimentation block of the thickening tank and a discharge direction of the sedimentation well are connected with a slurry bypass modification prefabrication system, and a tail water regulating tank is connected in a water outlet direction of the slurry bypass modification prefabrication system;
the discharging direction of the upper floating zone block of the thickening tank is connected with a conditioning tank, the discharging direction of the conditioning tank is connected with mechanical dehydration equipment, and the water outlet direction of the mechanical dehydration equipment is connected to a tail water regulating tank;
the water outlet direction of the upper floating block of the thickening tank is connected to the rapid filter, the water outlet direction of backwash water of the rapid filter is connected to the upper floating block of the thickening tank, the water filtering direction of the rapid filter is connected to the tail water regulating tank/ecological purifying tank, the water outlet of the ecological purifying tank is discharged to the external environment,
The water outlet direction of the tail water adjusting tank is sequentially connected with: a pool A, a contact fluidization pool, a secondary sedimentation pool and an ecological purifying pool;
The discharging direction of the secondary sedimentation tank is connected with a conditioning tank, the discharging direction of the conditioning tank is connected with a mechanical dehydration device, and the water outlet direction of the mechanical dehydration device is connected to a tail water regulating tank.
9. The algae sludge on-line mechanical drying and residual water purifying system as claimed in claim 8, wherein the slurry by-pass modification prefabrication system adopts a conical tank body, a water inlet pipe is arranged at the center of the tank body, and flocculating agent is added to assist sedimentation when algae water and slurry enter the tank body; a baffle is arranged in the slurry bypass modification prefabrication system, and algae water and slurry in the water inlet pipe flow through the baffle and fall into the tank bottom.
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| CN111252995A (en) * | 2018-11-30 | 2020-06-09 | 潍坊博华环境技术工程有限公司 | Sewage nitrogen and phosphorus removal method |
| CN111018283A (en) * | 2019-12-13 | 2020-04-17 | 中交（天津）生态环保设计研究院有限公司 | Plate-frame filter-pressing dehydration method for river and lake bottom mud |
| CN111285494A (en) * | 2020-02-18 | 2020-06-16 | 广西博世科环保科技股份有限公司 | Combined purification process of blue algae water body |
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