CN116290182A - Medium-sized shipborne movable cutter suction and automatic filter pressing silt system and river dredging process - Google Patents

Abstract

The invention discloses a medium-sized shipborne movable cutter suction and automatic filter pressing silt system and a river dredging process, which comprise a No. I cutter suction silt boat, a No. II filter pressing silt boat and a No. III temporary mud cake storage boat; the No. I cutter suction sludge ship comprises cutter suction equipment, a thickening tank, a coagulation tank and a feed pump, and has the functions of moving cutter suction sludge and outputting concentrated coagulation slurry; the No. II filter pressing mud boat comprises a diaphragm filter pressing unit, a filtrate purifying tank, an air pressing unit, a horizontal conveyor and a lifting conveyor, and has the functions of dehydrating high-pressure filter pressing mud, outputting blow-dried mud cakes and discharging filtrate up to the standard; the III temporary mud cake storage ship comprises a mud pushing machine and a mud bin; three boats are combined into a system for synchronously moving and sucking sludge and automatically pressing and filtering the sludge in a river channel. The river dredging process uses the dredging system and optimizes process parameters, thereby meeting the requirements of small occupied area, no pollution, quick emergency, high efficiency and low cost of large and medium river dredging engineering and having remarkable technical effect.

Description

Medium-sized shipborne movable cutter suction and automatic filter pressing silt system and river dredging process

Technical Field

The invention belongs to the technical field of solid-liquid separation of sludge in hydraulic engineering, and relates to an advanced technology of a dredging filter press newly applied to a cutter suction dredger, namely a middle-sized shipborne mobile cutter suction and automatic filter pressing sludge system without occupying land, and a river dredging process.

Background

The hydraulic engineering construction is an important component of the foundation construction of China, and the dredging of river channel dredging in the hydraulic engineering is a focus of attention; river channel siltation is a natural phenomenon, but the river channel siltation directly affects the normal exertion of various functions such as flood control, drainage, irrigation, water supply, navigation and the like; in order to restore the normal function of the river channel, promote the rapid and sustainable development of the economy and society, and more dredging projects for dredging the river channel; by dredging and managing, the river channel is deepened and widened, and the river water is cleared, so that the aims of 'clear water, smooth river and green land and beautiful land' are achieved, and the production conditions of enterprises and the living environment of masses are improved increasingly.

The river channel mechanical underwater dredging method mainly comprises two methods of blowing stirring type underwater dredging and cutter suction type underwater dredging; (1) The blowing-stirring underwater dredging method is to blow-stir the sludge deposited on the river bottom into turbid water by using mechanical equipment, so that the turbid water flows away along with the river water, thereby playing a role in dredging; the blowing-stirring type dredging method is a traditional dredging method and is limited to a riverway with relatively rapid water flow to be effective; however, the dredging method seriously pollutes downstream of river channels, and is forbidden in areas with developed industry and intensive personnel. (2) A cutter suction type underwater dredging method is characterized in that a cutter suction type dredging ship is used, the cutter suction type dredging ship comprises a cutter dredger and a sludge suction pump (a slurry pump), a rotary reamer of the cutter dredger is arranged around the front end of a sludge suction pipe, the sludge at the bottom of a deposited river is loosened by the rotary reamer, the water-accompanying sludge (the semi-fluid with the water content of 70-80% is inconvenient to transport by a truck) which is loosened by the sludge suction pump is sucked into a temporary sludge settling field on the river bank, the water-accompanying sludge is concentrated into sludge with the water content of less than 45% by gravity settling, and the sludge is transported to a long-term sludge piling field or recycled waste materials are changed into valuable, and the temporary sludge settling field is returned to a field according to the relevant regulation of a soil pipeline; the cutter suction type underwater dredging method is high in efficiency and suitable for dredging large and medium-sized riverways, but the concentration SS of solid suspended matters of sewage flowing back to the riverways in a silt settling field is difficult to reach the standard of 10mg/L. (3) There are also methods of dredging underwater using other equipment (e.g. trailing suction dredgers, grab dredgers, etc.), but this is less efficient than the cutter suction type of dredging underwater.

The filter press is a pressurized filtration device with a plurality of filter chambers intermittently operated; the automatic filter press is a filter press which integrates a machine, electricity and liquid and can automatically complete certain operation procedures, and the water content of a filter cake is about 45%; the membrane filter press is an automatic filter press which is formed by alternately arranging a plurality of membrane filter plates and filter cloth to form a plurality of filter chambers, can perform low-pressure static filtration once and squeeze filter cake dehydration by a membrane expansion membrane with high pressure twice, and has the water content of about 35 percent; the dredging filter press refers to a membrane filter press for dewatering water-carrying sludge; the membrane filter press is suitable for automatic solid-liquid separation of various suspension materials (i.e. mixture of liquid and solid particles) with higher dehydration requirement (lower water content of filter cake), and is widely applied to the fields of hydrometallurgy, energy sources, environmental protection, chemical industry, materials, pharmacy, sand washing and food industry.

The existing river underwater cutter suction and river bank sediment silt dredging mode has the following defects: (1) The temporary silt settling field along the river has large mobility occupation area, difficult returning to the field (land) and slow emergency response; (2) The two banks of the urban river channel can not be used without empty space, and the urban river channel dredging has a land bottleneck; if a mud irrigation vehicle team is adopted to transport a large amount of water-carrying sludge, the environment along the way is easy to be polluted, the cost is huge, the water-carrying sludge is injected into the mud irrigation vehicle by mud irrigation vehicle, and a sludge suction pump needs to be frequently stopped and started, so that the dredging efficiency is seriously influenced; (3) The concentration SS of the solid suspended matters of desliming sewage flowing back to the river channel in the silt settling field is difficult to reach 10mg/L, so that the downstream of the river channel is polluted and the environmental sanitation is affected; the method can not meet the comprehensive requirements of small occupied area, no pollution, high efficiency and low cost of large and medium-sized river dredging engineering.

Disclosure of Invention

The invention aims to overcome the defects of the existing river underwater cutter suction and river bank sediment sludge dredging mode, solve the comprehensive technical problems that the temporary sludge sedimentation field along the river has large occupied area, difficult field returning and returning, slow emergency response, the urban river dredging has land bottleneck, the sludge irrigation vehicle team transfers a large amount of water-carrying sludge with low efficiency and huge cost, the concentration SS of the solid suspended matters of the desliming sewage flowing back to the river in the sludge sedimentation field is difficult to reach the standard, the downstream of the river is polluted, and how to realize the small occupied area, no pollution, high efficiency and low cost of the large and medium-sized river dredging engineering, and provides a medium-sized shipborne movable cutter suction and automatic filter pressing sludge system and a river dredging process; river dredging process-river dredging process using the medium-sized shipborne movable cutter suction and automatic filter pressing sludge system of the invention is short for short because of limited number of patent names.

The innovative technical scheme adopted for solving the problems in the prior art is as follows: the utility model provides a middle-sized shipborne removes hank and inhales and automatic filter-pressing silt system (hereinafter simply: hank inhales filter-pressing silt ship), and overall technical scheme's main points are, and innovative overall structure compares with prior art promptly, and it has outstanding substantial characteristics that: the existing river channel underwater cutter suction and river bank sediment sludge dredging mode is improved into a cutter suction filter-pressing sludge ship, namely a large-scale land occupation-free ship-mounted movable cutter suction sludge, automatic coagulation-assisting filter-pressing sludge and temporary storage and transportation mud cake system for river channel dredging is mainly composed of a No. I cutter suction sludge ship, a No. II filter-pressing sludge ship and a No. III temporary storage mud cake ship, all equipment of the system are respectively arranged on three ships, the three ships can synchronously move along with the river channel dredging process, the underwater dredging capacity is 2500-3000 m/d, land occupation is avoided, the construction period of river channel dredging engineering is shortened, emergency response is fast, and cost is reduced and efficiency is improved; (1) The No. I hank-suction sludge ship has the functions of sludge hank loosening, water-accompanying sludge suction and delivery, water-accompanying sludge sedimentation and concentration, stirring and coagulation-aiding slurry and outputting coagulation slurry; firstly, sucking the loosened water-carrying sludge (semi-fluid with the water content of 70-80%) to a sedimentation thickening tank of a No. I hank-sucking sludge ship by a sludge sucking pump; then, the concrete slurry with the water content of 60-70% is input into four membrane filter presses of a No. II filter pressing slurry ship through a feeding floating pipe; (2) The No. II filter pressing mud boat has the functions of filtering and pressing the primary low-pressure filtered mud, squeezing mud cakes for dehydration for the second time under high pressure, blowing the mud cakes again if necessary, purifying the filtrate to reach the discharge standard, and outputting the mud cakes; inputting mud cakes with the water content of 30-35% into a No. III temporary mud cake storage ship through a scraper lifting conveyor; the sludge dewatering effect is good, the efficiency is high, and the concentration of solid suspended matters in filtrate is less than 10mg/L of SS standard value; (3) The III temporary mud cake storage ship is a temporary mud cake storage truck transport ship, and has the functions of temporary mud cake storage and truck loading and mud cake transportation; shoveling mud cakes into a mud truck at regular time by using a mud pushing machine at a quay so as to be directly transported to a long-term mud stacking field or to be recycled and changed into valuable; therefore, the comprehensive technical problems that the flowing occupied area of a temporary sludge settling field along a river is large, the returning to the field (land) is difficult, the emergency response is slow, the ground bottleneck exists in the dredging of a river channel penetrating through the city, the efficiency of transporting a large amount of water-carrying sludge by a mud irrigation vehicle team is low, the cost is huge, the concentration SS of solid suspended matters of desliming sewage flowing back to the river channel from the sludge settling field is difficult to reach the standard, the downstream of the river channel is polluted, and how to realize the dredging and dredging engineering of the large and medium-sized river channel with less occupied area, no pollution, high efficiency and low cost are solved; the specific design scheme of the invention is as follows.

The No. I hank-suction silt boat comprises a No. I boat, a hank silt machine, a silt suction pump (a slurry pump), a sundry filter screen, a sedimentation and concentration tank, a sedimentation slurry pump, preparation equipment, a flocculating agent pump, a stirring and coagulation tank, a high-pressure feeding pump and a feeding floating pipe; (1) characteristics of the main device: the ship I is a ship with the length of 60m and the width of 16m, the left bow of the ship I is provided with a sludge inlet groove, and the ship I is provided with a sludge wringer and a sludge suction pump; the sludge wringing machine is provided with a rotary reamer, and the rotary reamer is positioned around the front end of the sludge suction pipe and can wring sludge deposited on the river bottom; the sludge suction pump is a wear-resistant sludge suction pump, and can suck the loosened water-associated sludge (semi-fluid with the water content of 70-80%) into the No. I ship; the impurity filter screen is a square filter screen for intercepting impurities with the thickness of more than 5 mm; the settling and thickening tank is a gravity settling and thickening tank for water-carrying silt, and is provided with an overflow port, a floating sieve and a water-carrying silt with the water content of 70-80% can be settled into mud with the water content of 60-70% by gravity, wherein the upper layer purified water of the settling and thickening tank overflows back to the river through the floating sieve; the sedimentation slurry pump is a vertical submerged slurry pump, and the pump body of the sedimentation slurry pump is positioned below the water surface; the preparation equipment is automatic preparation and medicine adding equipment and comprises a flocculant pump, the flocculant can be automatically prepared and quantitatively added into the stirring coagulation tank, and the flocculant can enable particles in slurry to be aggregated and become large to form flocculation; the volume of the stirring coagulation tank is 60m, and the stirring coagulation tank is provided with an electric stirring paddle, so that the flocculant and the slurry can be fully mixed to form a coagulation slurry; the set high-pressure feed pump can pressurize 0.9-1.0MPa to input the concrete slurry into four diaphragm filter presses of a No. II filter pressing slurry ship; the feeding floating pipe comprises a feeding hose and a floating pontoon. (2) connection relation of main devices: the sundry filter screen is arranged in the sludge inlet groove of the left ship head; the sedimentation thickening tank is arranged at the middle left part of the No. I ship, the double sedimentation slurry pumps are alternately arranged in the sedimentation thickening tank, and the pump bodies of the double sedimentation slurry pumps are positioned below the water surface and are respectively communicated with the two stirring coagulation tanks; the two stirring coagulation ponds are arranged at the right part in the No. I ship, four high-pressure feed pumps and flocculant pumps are respectively arranged around the two stirring coagulation ponds, and the four high-pressure feed pumps are respectively communicated with the four membrane filter presses.

The No. II filter pressing slurry ship comprises a No. II ship, a membrane filter press, a pressing water tank, a pressing water pump, a cloth washing water tank, a cloth washing water pump, a filter press platform, a filtrate purifying tank, a filter press protective cover, a belt horizontal conveyor, a scraper lifting conveyor, an air compressor, an air storage tank, an air cooling dryer and an oil-water separator; (1) characteristics of the main device: the ship II is a ship with the length of 60m and the width of 16 m; the membrane filter press is a special membrane automatic filter press for dredging, has the functions of PLC program control, automatic compression of a filter plate, automatic turning plate liquid receiving, automatic drying of the filter cake, automatic plate pulling and cake discharging and automatic filter cloth cleaning, and can filter and press the concrete slurry with the water content of 60-70% into mud cakes with the water content of 30-35%; the arranged squeezing water pump can be used for adding high-pressure water with the pressure of 1.7-1.8MPa into the squeezing cavity of the membrane filter press; the cloth washing water pump is a high-pressure water pump for washing filter cloth; the filter press platform is arranged, and a primary belt conveyor can be arranged below the filter press platform; the filter press protective cover is arranged and is an integrated filter press protective and deodorizing cover; the arranged belt horizontal conveyor is a horizontal belt filter cake conveyor shared by the two membrane filter presses; the scraper lifting conveyor is vertically butted with two belt horizontal conveyors and comprises a horizontal butted converging section and an inclined cantilever lifting section; the air compressor can input compressed air of 0.8-0.9 MPa into the air storage tank; the air storage tank can stably input 0.85MPa compressed air into the multiple filter chambers of the membrane filter press; the air cooling dryer is a refrigerating type compressed air dryer; and connecting the air compressor, the air cooling and drying machine and the air storage tank by utilizing pipelines to form an air compressor unit. (2) connection relation of main devices: the filter press platform is arranged in the middle of a No. II ship, four membrane filter presses are arranged on the filter press platform, four filter press protective covers cover the four membrane filter presses respectively, a squeezing water tank is arranged beside the membrane filter presses, a squeezing water pump is arranged beside the squeezing water tank and is communicated with the squeezing water tank and the membrane filter presses, a water washing and distributing tank is arranged beside the membrane filter presses, a water washing and distributing pump is arranged beside the water washing and distributing tank and is communicated with the membrane filter presses in parallel, a filtrate purifying tank is arranged beside the membrane filter presses and is communicated with the membrane filter presses in parallel, a double-belt horizontal conveyor is arranged below the filter press platform, a scraper lifting conveyor is arranged at the left head of the No. II ship, an inclined cantilever lifting section of the scraper lifting conveyor corresponds to the No. III temporary mud cake storage ship, and an air compressor set is arranged at the right part of the No. II ship and is communicated with the membrane filter presses in parallel.

The No. III temporary mud cake storage ship is a temporary mud cake storage loading and transferring ship and comprises a No. III ship, a mud pushing machine and a mud storage bin; (1) characteristics of the main device: the III ship is a ship with the length of 60m and the width of 16 m; the mud pushing machine is provided with a rotary mud pushing loading hopper; the capacity of the sludge bin is 1000 m; (2) connection relation of main devices: the No. III ship is a sludge bin except for the sludge pushing machine and the sidewalk occupation, and the sludge bin can be mainly arranged on one side close to the No. II filter pressing sludge ship, so that the No. III temporary sludge cake storage ship can conveniently move to accept sludge cakes conveyed by the scraper lifting conveyor; the mud pushing machine is parked in the mud bin and can walk.

The invention also provides a river dredging process, namely a river dredging process of the medium-sized shipborne mobile cutter suction and automatic filter pressing sludge system, which comprises the following steps: under the control of a PLC program control system, (1) wringing and sucking sludge: a rotary reamer of the dredging machine loosens the sludge deposited on the river bottom; sucking the loosened sludge with water (semi-fluid with water content of 70-80%) into a sludge inlet tank of a No. I sludge sucking ship by a sludge sucking pump; (2) intercepting sundries: the sundries with the thickness of more than 5mm in the water-carrying silt are intercepted by the sundries filter screen and are intensively treated, and the water-carrying silt flows into the sedimentation thickening tank; (3) sedimentation thickening: gravity settling the water-carrying sludge into dense slurry with water content of 60-70% in a settling and thickening tank, and conveying the dense slurry into a stirring and coagulating tank by a settling slurry pump; the upper layer purified water in the sedimentation and concentration tank overflows back into the river through the floating sieve; (4) preparing a medicament: automatically preparing flocculant (polyacrylamide) with the concentration of 1.5-2%o, wherein the addition amount of the flocculant is 0.6-0.7%o (the weight of flocculant/filter cake or mud cake); the dosage is adjusted according to the water content of the filter cake, and the dosage with lower water content of the filter cake is correspondingly increased; (5) stirring and coagulating: the flocculant pump adds a quantitative flocculant (polyacrylamide) into a stirring coagulation tank, and the flocculant pump is fully mixed into a concrete slurry through stirring, and four high-pressure feed pumps sequentially pressurize 0.9-1.0MPa to respectively input the concrete slurry into four diaphragm filter presses of a No. II filter pressing slurry ship; (6) filter pressing sludge: four membrane filter presses are staggered with each other to circularly work for two hours (the single cycle period is 2 hours); firstly, carrying out static filtration under the pressure of 0.9-1.0MPa, then, carrying out variable-frequency pressure-maintaining by using a bulge membrane with the pressure of 1.7-1.8MPa for the second time, and carrying out dehydration on a filter cake by using an air compressor unit to input 0.85MPa compressed air into a multi-filter chamber of a membrane filter press to further blow-dry the filter cake when necessary, so that the concrete slurry is filtered into mud cakes with the water content of 30-35% (meeting the requirement of the external transportation of a truck), and the filtrate flows into a filtrate purifying tank and overflows into a river after settling and purifying the upper layer purified water reaching the standard (SS value <10 mg/L); after the filtration is completed, the filter plate is automatically pulled open, and the filter cake falls onto the belt horizontal conveyor by means of self gravity; (7) outputting mud cakes: the belt horizontal conveyor and the scraper lifting conveyor are combined to convey the mud cake to a mud bin of a No. III temporary mud cake storage ship; (8) loading and transferring: when a certain amount (< 1000 m) of mud cakes are accumulated in the mud bin, the mud cakes are shoveled into a mud truck by using a mud pushing machine on the quayside, so that the mud cakes are directly collected and transferred to a long-term mud stacking field or the resource is changed into valuable.

The medium-sized shipborne movable cutter suction and automatic filter pressing silt system and the river dredging process provided by the invention have the outstanding substantive characteristics and remarkable progress that: the method comprises the following steps of (1) occupation-free dredging: the existing river channel underwater cutter suction and river bank sediment silt dredging mode is improved into a large shipborne mobile cutter suction silt, automatic coagulation-aiding filter pressing mud and temporary storage mud cake transferring system for river channel dredging, so that land resources are not occupied, the construction period of river channel dredging engineering is shortened, emergency response is fast, cost is reduced and efficiency is improved; (2) a sludge filter pressing mode: the special blow-drying type diaphragm automatic filter press for dredging is arranged, and the technological parameters are optimized according to material preparation, so that the effect and the production efficiency of filter pressing sludge are improved; (3) slurry coagulation mode: by adopting a slurry flocculation process, the effect of pressure filtration of sludge and the production efficiency are improved; and (4) a comprehensive sewage treatment mode: the sewage and filtrate are subjected to sedimentation, purification and flocculation comprehensive treatment, so that the standard discharge is realized, and the environmental sanitation is protected; and (5) system program control and automatic dispensing modes thereof: by arranging the PLC program control system and the automatic dispensing device, the automation level and the production efficiency of the system are improved; fills the blank of a medium-sized shipborne movable cutter suction and automatic filter pressing silt system and a river dredging process in China, and has remarkable technical effect.

Drawings

FIG. 1 is a schematic diagram of a suction filter-pressing sludge vessel (comprising a suction sludge vessel I, a filter-pressing sludge vessel II and a temporary sludge cake vessel III) according to the invention.

FIG. 2 is a schematic diagram of the connection relationship of the water supply equipment of the diaphragm filter press unit of the cutter suction filter press sludge vessel.

FIG. 3 is a schematic diagram of the connection relationship of air compressor units (air supply devices) of the pressure filtration sludge suction dredger.

FIG. 4 is a schematic front view showing the assembly of a membrane filter press and a filter press protecting cover of the pressure filter sludge suction dredger.

FIG. 5 is a schematic diagram showing the assembly of a membrane filter press and a filter press shield of the pressure filter sludge suction dredger.

FIG. 6 is a schematic diagram of a river dredging process flow of the cutter suction filter-pressing sludge vessel.

Reference numerals: 1-I a cutter suction silt ship, 101-a sundry filter screen, 103-a sedimentation and concentration tank, 105-a sedimentation and slurry pump, 106-a flocculant pump, 108-a stirring and coagulation tank, 109-a high-pressure feed pump and 110-a feed floating pipe; no. 2-II filter pressing mud boat, 201-membrane filter pressing unit (including 202-membrane filter press, 203-filter press platform, 204-press water tank, 205-press water pump, 206-cloth washing water tank, 207-cloth washing water pump, 208-filtrate purifying tank, 216-filter press protective cover), 209-belt horizontal conveyor, 210-scraper lifting conveyor, 211-air pressing unit (including 212-air compressor, 213-air storage tank, 214-air dryer, 215-oil-water separator); 221-filter plate compressing mechanism, 222-squeezing filtering mechanism, 223-turning plate liquid receiving mechanism, 224-pulling plate cake discharging mechanism, 225-cleaning filter cloth mechanism, 226-PLC program control system, no. 3-III temporary mud cake storage ship (temporary mud cake storage and transportation ship), 302-mud pushing machine and 303-mud silo.

The invention relates to a cutter suction filter-pressing sludge ship (the invention), which comprises a No. 1 cutter suction sludge ship, a No. 2 filter-pressing sludge ship and a No. 3-III temporary sludge cake storage ship.

Detailed Description

The following describes the technical solution in the embodiment of the present invention with reference to the drawings in the embodiment of the medium-sized shipborne mobile cutter suction and automatic filter pressing sludge system and the river dredging process, and the described embodiment is only a part of the preferred embodiments of the present invention, but not all the embodiments; based on the embodiment of the invention, all other embodiments, such as a cutter suction filter-pressing sludge ship with the same river dredging process and similar occupied-free system structure, obtained by a person skilled in the art without creative labor belong to the protection scope of the invention.

Example 1

The utility model provides a medium-sized shipborne type removes hank and inhales and automatic filter-pressing silt system (simply: hank inhales filter-pressing silt ship), and the main points of the general implementation scheme of innovation are: the existing river channel underwater cutter suction and river bank sediment sludge dredging mode is improved into a cutter suction filter-pressing sludge ship, namely a large-scale land occupation-free shipborne movable cutter suction sludge, automatic coagulation-assisting filter-pressing sludge and temporary storage and transportation mud cake system for river channel dredging is mainly composed of a No. I cutter suction sludge ship 1, a No. II filter-pressing sludge ship 2 and a No. III temporary storage mud cake ship 3, all equipment of the system are respectively arranged on three ships, and the underwater dredging capacity is 2500-3000 m/d, so that land occupation is avoided; (1) The No. I hank-suction sludge ship 1 has the functions of sludge hank loosening, water-accompanying sludge suction and delivery, water-accompanying sludge sedimentation and concentration, stirring and coagulation-aiding slurry and outputting coagulation slurry; firstly, sucking the loosened water-carrying sludge (semi-fluid with the water content of 70-80%) to a sedimentation thickening tank 103 of a No. I cutter-suction sludge ship 1 by a sludge suction pump; then, the concrete slurry with the water content of 60-70% is input into four membrane filter presses 202 of a No. II filter-pressing slurry ship 2 through a feeding floating pipe 110; (2) The No. II filter pressing mud boat 2 has the functions of filtering mud at a low pressure, squeezing mud cakes at a high pressure for dehydration at a second time, blowing the mud cakes to dry if necessary, purifying filtrate to reach the discharge standard, and outputting the mud cakes; inputting mud cakes with the water content of 30-35% into a mud storage bin 303 of a No. III temporary mud cake storage ship 3 through a scraper lifting conveyor 210; the sludge dewatering effect is good, the efficiency is high, and the concentration of solid suspended matters in filtrate is less than 10mg/L of SS standard value; (3) The No. III temporary mud cake storage ship 3 is a temporary mud cake storage truck loading and transferring ship, and has the functions of temporary mud cake storage and truck loading and transferring of mud cakes; shoveling mud cakes into a mud truck at regular time by using a mud pushing machine 302 at a quayside terminal so as to be directly transported to a long-term mud stacking field or to be recycled and changed into valuable; the problems that the temporary sludge settling field along the river has large occupied area, difficult returning to the field (land), slow emergency response, land utilization bottleneck in dredging the urban river, low efficiency and huge cost in transferring a large amount of water-carrying sludge by a mud irrigation vehicle team, difficulty in reaching the standard of the concentration SS of solid suspended matters of desliming sewage flowing back to the river in the sludge settling field and pollution of the downstream of the river are solved, and the comprehensive technical problems of small occupied area, no pollution, high efficiency and low cost in dredging engineering of the large and medium-sized river are realized, so that the method is intended for the use of the Tianjin channel bureau in the middle-sized and medium-sized river; specific embodiments are described in detail below.

First, I hank inhale silt ship 1 scheme: the No. I cutter suction dredger 1 comprises a No. I dredger, a cutter dredger, a sludge suction pump (slurry pump), a sundry filter screen 101, a sedimentation and thickening tank 103, a sedimentation slurry pump 105, preparation equipment, a flocculating agent pump 106, a stirring and coagulation tank 108, a high-pressure feeding pump 109 and a feeding floating pipe 110.

The ship I is a ship with the length of 60m and the width of 16m, the left bow of the ship is provided with a sludge inlet groove, and a sludge wringing machine and a sludge suction pump are arranged on the ship I (independent wringing and suction ships can be also arranged, and the wringing machine and the sludge suction pump are included); the device is used for bearing various devices and facilities of the No. I cutter suction silt ship 1 and moves along with the dredging progress of the river channel dredging.

The sludge cutter is provided, is a sludge cutter provided by the No. I ship, is positioned at the left bow of the No. I ship, is provided with a rotary reamer, and is positioned around the front end of the sludge suction pipe and used for loosening sludge deposited on the river bottom so as to facilitate suction.

The silt sucking pump is a wear-resistant mud sucking pump provided by the No. I ship and is positioned at the left bow of the No. I ship, and the silt sucking pump is provided with a silt sucking pipe and is used for sucking the loosened silt (semi-fluid with the water content of 70-80%) into the No. I ship.

The sundry filter screen 101 is a square filter screen for intercepting sundries with the thickness of more than 5mm, is arranged in a sludge inlet groove of the left ship head and is used for intercepting sundries with the thickness of more than 5mm in water sludge and carrying out centralized treatment.

The sedimentation and concentration tank 103 is a gravity sedimentation and concentration tank 103 for water-carrying silt, the sedimentation and concentration tank 103 is arranged at the middle left part of the No. I ship and is provided with an overflow port and a float sieve, and the sedimentation and concentration tank 103 is used for gravity sedimentation of the water-carrying silt with the water content of 70-80% into mud with the water content of 60-70%, and the upper layer purified water of the sedimentation and concentration tank overflows back into a river through the float sieve.

The settling slurry pump 105 is a vertical submerged slurry pump, the double settling slurry pumps 105 are alternately arranged in the settling and thickening tank 103, and pump bodies of the double settling slurry pumps are positioned below the water surface and are respectively communicated with two stirring and coagulating tanks 108; for feeding the dense slurry in the lower layer of the sedimentation dense tank 103 into two stirring coagulation tanks 108, respectively.

The preparation equipment is automatic preparation and medicine adding equipment (a full-automatic two-box flocculant preparation device produced by Jingjin equipment), comprises a flocculant pump 106, is arranged beside a stirring coagulation tank 108 and is used for automatically preparing flocculant and quantitatively adding the flocculant into the stirring coagulation tank 108, and the flocculant can enable particles in slurry to gather and become large to form flocculation.

The volume of the stirring coagulation tank 108 is 60m, the stirring coagulation tank is provided with an electric stirring paddle, and the two stirring coagulation tanks 108 are arranged at the right part in the No. I ship and are used for fully mixing the flocculating agent and the slurry into the coagulated slurry so as to improve the effect and efficiency of pressure filtration of the sludge.

The four high-pressure feeding pumps 109 are respectively arranged beside the two stirring coagulation tanks 108 and are respectively communicated with four membrane filter presses 202, and the four high-pressure feeding pumps 109 are used for pressurizing 0.9-1.0MPa to input the concrete slurry into the four membrane filter presses 202 of the No. II filter-pressing mud boat 2.

The feeding float pipe 110 comprises a feeding hose and a float bowl; for water floating communication of four high pressure feed pumps 109 and four membrane filter presses 202.

Second, II filter pressing mud boat 2 schemes: the No. II filter pressing mud boat 2 comprises a No. II boat, a diaphragm filter pressing unit 201, a belt horizontal conveyor 209, a scraper lifting conveyor 210 and an air compressor unit 211; the membrane filter press unit 201 comprises a membrane filter press 202, a filter press platform 203, a squeezing water tank 204, a squeezing water pump 205, a water washing and distributing tank 206, a water washing and distributing pump 207, a filtrate purifying tank 208 and a filter press protecting cover 216, and adopts a modularized design; the air compressor unit 211 comprises an air compressor 212, an air storage tank 213, an air dryer 214 and an oil-water separator 215, and adopts a modularized design.

The ship II is a ship with the length of 60m and the width of 16 m; the device and the facility are used for bearing various devices and facilities of the No. II filter-pressing mud boat 2 and synchronously move with the No. I cutter-suction mud boat 1 along with the dredging process of river channel dredging.

The filter press platform 207 is arranged in the middle of the No. II ship, and two belt horizontal conveyors 209 can be arranged below the platform in parallel; for mounting four membrane filter presses 202 and their accessories.

The membrane filter press 202 is a blow-drying type membrane automatic filter press special for dredging, and mainly comprises a double-beam frame (comprising double-side main beams), a filter plate pressing mechanism 221, a squeezing and filtering mechanism 222, a filter cake blow-drying system, a turning plate liquid receiving mechanism 223, a pulling plate cake discharging mechanism 224, a filter cloth cleaning mechanism 225 and a PLC program control system 226; the filter has the functions of automatically compacting the filter plate, automatically turning over the plate to receive liquid, automatically drying the filter cake, automatically pulling the plate to unload the cake and automatically cleaning the filter cloth; four membrane filter presses 202 are arranged on a filter press platform 203 in two rows and are used for automatically press-filtering and drying the concrete slurry with the water content of 60-70% into mud cakes with the water content of 30-35%.

The press water tank 204 and the press water pump 205 are arranged, the press water tank 204 is arranged beside the membrane filter press 202, and the press water pump 205 is arranged beside the press water tank 204 and connected with the press water tank 204 and the membrane filter press 202, and is used for inputting high-pressure water of 1.7-1.8MPa into the press cavity of the membrane filter press 202.

The water washing tank 206 and the water washing pump 207 are arranged, the water washing tank 206 is arranged beside the membrane filter press 202, the water washing pump 207 is a high-pressure water pump for washing filter cloth, and the water washing pump 206 and the membrane filter press 202 are arranged beside the water washing tank 206 and are connected in parallel, so that high-pressure water washing of 3.0MPa is provided for a filter cloth washing mechanism, and the filter cloth is washed and regenerated.

The filtrate purifying pool 208 is arranged beside the membrane filter press 202 and is communicated with the membrane filter press 202, and is used for settling and purifying the filtrate to reach the standard and enabling the upper-layer purified water to overflow back into the river.

The filter press protection cover 216 is arranged and is an integrated filter press protection and deodorization cover; four filter press shields 216 cover the four membrane filter presses 202, respectively, for dust and rain protection and filter cake odor removal for the membrane filter presses 202.

The arranged belt horizontal conveyor 209 is a horizontal belt filter cake conveyor shared by the two membrane filter presses 202; two belt horizontal conveyors 209 are mounted side by side below the filter press platform 207 for receiving the cake from the cake discharge of the draw plate and outputting it to a scraper lift conveyor 210.

The scraper lifting conveyor 210 is arranged, and is a scraper lifting conveyor 210 vertically butted with two belt horizontal conveyors 209, and comprises a horizontal butted converging section and an inclined cantilever lifting section; the scraper lifting conveyor 210 is installed at the left head of the No. II ship, and the inclined cantilever lifting section of the scraper lifting conveyor corresponds to the No. III temporary mud cake storage ship 3, and is used for combining, lifting and conveying filter cakes output by the two belt horizontal conveyors 209 to a mud storage bin 303 of the No. III ship.

The air compressor 212 is arranged at the right part of the No. II ship, is connected in series with the air dryer 214 and the air storage tank 213, and is used for inputting compressed air of 0.8-0.9 MPa into the air storage tank 213 for drying the filter cake.

The air cooling dryer 214 is a refrigerating type compressed air dryer, is arranged beside the air compressor 212 and is connected in series on a pipeline between the air compressor 212 and the air storage tank 213, and is used for drying compressed air in the pipeline.

The air storage tank 213 is arranged beside the air cooling and drying machine 214, and is respectively communicated with the air cooling and drying machine 214 and the membrane filter press 202, and is used for stably inputting 0.85MPa compressed air into multiple filter chambers of the membrane filter press 202.

Third, no. III temporary mud cake storage ship 3 scheme: the No. III temporary mud cake storage ship 3 is a temporary mud cake storage loading and transferring ship and comprises a No. III ship, a mud pushing machine 302 and a mud storage bin 303.

The III ship is a ship with the length of 60m and the width of 16 m; the device is used for bearing various devices and mud storage of the No. III temporary mud cake storage ship 3 and synchronously moves with the No. II filter pressing mud ship 2 along with the dredging process of river channel dredging.

The mud pushing machine 302 is provided with a rotary mud pushing loading hopper; the mud pushing machine 302 is parked in the mud storage bin 303 and can walk, and is used for pushing mud cakes in the mud storage bin 303 to be flat, crushing a bridge gap formed by large mud cakes, and shoveling the mud cakes into a mud truck at a quasi-wharf at regular time.

The capacity of the sludge bin 303 is 1000 m; the space of the No. III ship except the mud pushing machine 302 and the occupied space of the sidewalk is a mud storage bin 303, and the mud storage bin 303 can be mainly arranged on one side close to the No. II filter pressing mud ship, so that the No. III temporary mud cake storage ship 3 can conveniently move to receive mud cakes conveyed by the scraper lifting conveyor 210; for receiving and temporarily storing the mud cake for centralized direct outward transport.

The medium-sized shipborne movable cutter suction and automatic filter pressing sludge system provided by the invention has the outstanding substantial characteristics and remarkable progress that: the method comprises the following steps of (1) occupation-free dredging: the existing river channel underwater cutter suction and river bank sediment silt dredging mode is improved into a large shipborne mobile cutter suction silt, automatic coagulation-aiding filter pressing mud and temporary storage mud cake transferring system for river channel dredging, so that land resources are not occupied, the construction period of river channel dredging engineering is shortened, emergency response is fast, cost is reduced and efficiency is improved; (2) a sludge filter pressing mode: by arranging the blow-drying type diaphragm automatic filter press 202 special for dredging, the effect and the production efficiency of filtering and pressing sludge are improved; (3) slurry coagulation mode: by adopting a slurry flocculation process, the effect of pressure filtration of sludge and the production efficiency are improved; and (4) a comprehensive sewage treatment mode: the sewage and filtrate are subjected to sedimentation and purification and coagulation-assisting comprehensive treatment, so that the standard discharge is realized, and the environmental sanitation is protected; (5) program control mode of the system: by arranging the PLC program control system, the automation level and the production efficiency of the system are improved; fills the blank of a medium-sized shipborne movable sludge wringing and sucking and automatic sludge pressing system in China, meets the comprehensive requirements of no occupation of land, no pollution, high efficiency and low cost of a large and medium-sized river dredging project of a Tianjin channel bureau of China, and has remarkable technical effect.

Example 2

The invention relates to a river dredging process, in particular to a river dredging process using a medium-sized shipborne mobile cutter suction and automatic filter pressing sludge system, wherein the whole river dredging process is intelligently controlled by a PLC program control system, and the main process flow is as follows;

(1) And sucking sludge in a twisting way: a rotary reamer of the dredging machine loosens the sludge deposited on the river bottom; the sludge sucking pump sucks the loosened sludge with water (semi-fluid with water content of 70-80%) into a sludge inlet groove of the No. I sludge sucking ship 1;

(2) Intercepting sundries: the sundries with the size of more than 5mm in the water-carrying sludge are intercepted and intensively treated by the sundry filter screen 101 in the sludge tank, and the water-carrying sludge flows into the sedimentation thickening tank 103 through the sundry filter screen 101;

(3) Sedimentation and concentration: gravity settling the water-associated sludge into a dense slurry with water content of 60-70% in a settling and thickening tank 103, and conveying the dense slurry into a stirring and coagulating tank 108 by a settling slurry pump 105; the upper layer purified water reaching the standard after sedimentation and purification overflows back into the river through a floating sieve;

(4) Preparing a medicament: automatically preparing flocculant (polyacrylamide) with the concentration of 1.5-2%o, wherein the addition amount of the flocculant is 0.6-0.7%o (the weight of flocculant/filter cake or mud cake); the dosage is adjusted according to the water content of the filter cake, and the dosage with lower water content of the filter cake is correspondingly increased; preparing a medicament and settling and thickening are carried out synchronously;

(5) Stirring and coagulating: the flocculant pump 106 adds a quantitative flocculant (polyacrylamide) into the stirring coagulation tank 108, and can also add lime into the stirring coagulation tank 108 to assist coagulation (assist flocculant plays a role and enhances coagulation effect), the materials are fully mixed into concrete slurry through stirring, and four high-pressure feed pumps 109 sequentially pressurize 0.9-1.0MPa to respectively input the concrete slurry into four membrane filter presses 202 of a No. II filter-pressing slurry ship 2;

(6) And (3) filter pressing sludge: the four membrane filter presses 202 are staggered with each other to circularly work for two hours (the single cycle period is 2 hours); firstly, carrying out static filtration under pressure maintaining of 0.9-1.0MPa, then closing a high-pressure feed pump 109 and a feed valve, carrying out variable-frequency pressure maintaining on a bulge membrane with a secondary high pressure of 1.7-1.8MPa, squeezing a filter cake to dehydrate, inputting compressed air with the pressure of 0.85MPa into a multi-filter chamber of a membrane filter press 202 by using an air compressor unit 211 when necessary, further drying the filter cake, filtering and pressing concrete slurry into mud cakes with the water content of 30-35% (meeting the requirement of the outward transportation of trucks), and allowing filtrate to flow into a filtrate purifying tank 208, and overflowing upper-layer purified water reaching the standard (SS value <10 mg/L) after sedimentation and purification into a river; after the filtration is completed, the filter plate is automatically pulled away, and the filter cake falls onto the belt horizontal conveyor 209 by self gravity; when necessary, the filter cloth is automatically cleaned by using high-pressure water of 3.0 Mpa;

(7) Outputting mud cakes: the belt horizontal conveyor 209 and the scraper lifting conveyor 210 are combined to convey the mud cake to a mud silo 303 of a No. III temporary mud cake storage ship 3;

(8) Loading and transferring: when the mud cake of the mud bin 303 is accumulated to a certain amount (< 1000 m), the mud cake is shoveled into a mud truck by using a mud pushing machine 302 on the quayside so as to be directly collected and transported to a long-term mud piling site or recycled for changing waste into valuable.

The river dredging process provided by the invention has the outstanding substantial characteristics and remarkable progress that: the medium-sized shipborne movable cutter suction and automatic filter pressing sludge system has the beneficial effects that the process parameters are optimized according to the material preparation: the method comprises the following steps of (1) occupation-free dredging: the existing river channel underwater cutter suction and river bank sediment silt dredging mode is improved into a large shipborne mobile cutter suction silt, automatic coagulation-aiding filter pressing mud and temporary storage mud cake transferring system for river channel dredging, so that land resources are not occupied, the construction period of river channel dredging engineering is shortened, emergency response is fast, cost is reduced and efficiency is improved; (2) a sludge filter pressing mode: by arranging the blow-drying type diaphragm automatic filter press 202 special for dredging and optimizing process parameters due to material preparation, the effect and the production efficiency of filter pressing sludge are improved; (3) slurry coagulation mode: by adopting a mud flocculation and coagulation assisting process, the effect and the production efficiency of pressure filtration of sludge are improved; and (4) a comprehensive sewage treatment mode: the sewage and filtrate are subjected to sedimentation, purification and flocculation comprehensive treatment, so that the standard discharge is realized, and the environmental sanitation is protected; and (5) system program control and automatic dispensing modes thereof: by arranging the PLC program control system and the automatic dispensing device, the automation level and the production efficiency of the system are improved; fills the blank of the river dredging process using the medium-sized shipborne mobile cutter suction and automatic filter pressing silt system in China, meets the comprehensive requirements of no occupation of land, no pollution, high efficiency and low cost of the large and medium river dredging engineering of the middle-sized Tianjin channel bureau, and has remarkable technical effect.

Claims (5)

1. The utility model provides a middle-sized shipborne removes hank and inhales and automatic filter-pressing silt system, includes that I hank is inhaled silt ship, II filter-pressing mud ship, III temporary storage mud cake ship, its characterized in that: the No. I hank-suction silt boat comprises a No. I boat, a hank silt machine, a silt suction pump, a sundry filter screen, a sedimentation and thickening tank, a sedimentation and mud pump, preparation equipment and a flocculating agent pump thereof, a stirring and coagulation tank, a high-pressure feeding pump and a feeding floating pipe; the sundry filter screen is arranged in the sludge inlet groove of the left ship head; the sedimentation thickening tank is arranged at the middle left part of the No. I ship, the double sedimentation slurry pumps are alternately arranged in the sedimentation thickening tank, and the pump bodies of the double sedimentation slurry pumps are positioned below the water surface and are respectively communicated with the two stirring coagulation tanks; the two stirring coagulation tanks are arranged at the right part of the No. I ship, four high-pressure feed pumps and flocculant pumps are respectively arranged around the two stirring coagulation tanks, and the four high-pressure feed pumps are respectively communicated with the four membrane filter presses; the No. II filter pressing slurry ship comprises a No. II ship, a membrane filter press, a pressing water tank, a pressing water pump, a cloth washing water tank, a cloth washing water pump, a filter press platform, a filtrate purifying tank, a filter press protective cover, a belt horizontal conveyor, a scraper lifting conveyor, an air compressor, an air storage tank, an air cooling dryer and an oil-water separator; the filter press platform is arranged in the middle of a No. II ship, four membrane filter presses are arranged on the filter press platform, four filter press protective covers cover the four membrane filter presses respectively, a squeezing water tank is arranged beside the membrane filter presses, a squeezing water pump is arranged beside the squeezing water tank and communicated with the squeezing water tank and the membrane filter press, a water washing and distributing tank is arranged beside the membrane filter press, a water washing and distributing pump is arranged beside the water washing and distributing tank and communicated with the membrane filter press in parallel, a filtrate purifying tank is arranged beside the membrane filter press and communicated with the membrane filter press in parallel, a double-belt horizontal conveyor is arranged below the filter press platform, a scraper lifting conveyor is arranged at the left head of the No. II ship, an inclined cantilever lifting section of the scraper lifting conveyor corresponds to the No. III temporary mud cake storage ship, and an air compressor set is arranged at the right part of the No. II ship and communicated with the membrane filter press in parallel; the No. III temporary mud cake storage ship is a temporary mud cake storage loading and transporting ship and comprises a No. III ship, a mud pushing machine and a mud storage bin, wherein the No. III ship is the mud storage bin except for the occupation of the mud pushing machine and a sidewalk, and the mud pushing machine is parked in the mud storage bin and can walk; the ship I, the ship II and the ship III are all ships with the length of 60m and the width of 16m, and can synchronously move along with the dredging progress of the river channel dredging.

2. The midship mobile cutter suction and automatic pressure filtration sludge system of claim 1, wherein: the sludge suction ship is characterized in that the left bow of the ship I is provided with a sludge inlet groove and is provided with a sludge cutter and a sludge suction pump; the sludge wringing machine is provided with a rotary reamer, and the rotary reamer is positioned around the front end of the sludge suction pipe and can wring sludge deposited on the river bottom; the sludge suction pump is a wear-resistant sludge suction pump, and can suck the loosened water-associated sludge (semi-fluid with the water content of 70-80%) into the No. I ship; the impurity filter screen is a square filter screen for intercepting impurities with the thickness of more than 5 mm; the settling and thickening tank is a gravity settling and thickening tank for water-carrying silt, and is provided with an overflow port, a floating sieve and a water-carrying silt with the water content of 70-80% can be settled into mud with the water content of 60-70% by gravity, wherein the upper layer purified water of the settling and thickening tank overflows back to the river through the floating sieve; the sedimentation slurry pump is a vertical submerged slurry pump, and the pump body of the sedimentation slurry pump is positioned below the water surface; the preparation equipment is automatic preparation and medicine adding equipment and comprises a flocculant pump, the flocculant can be automatically prepared and quantitatively added into the stirring coagulation tank, and the flocculant can enable particles in slurry to be aggregated and become large to form flocculation; the volume of the stirring coagulation tank is 60m, and the stirring coagulation tank is provided with an electric stirring paddle, so that the flocculant and the slurry can be fully mixed to form a coagulation slurry; the set high-pressure feed pump can pressurize 0.9-1.0MPa to input the concrete slurry into four diaphragm filter presses of a No. II filter pressing slurry ship; the feeding floating pipe comprises a feeding hose and a floating pontoon.

3. The midship mobile cutter suction and automatic pressure filtration sludge system of claim 1, wherein: the II-type filter pressing mud boat is provided with a diaphragm filter press which is a diaphragm automatic filter press special for dredging, and comprises a double-beam frame, a filter plate pressing mechanism, a squeezing and filtering mechanism, a filter cake drying system, a turning plate liquid receiving mechanism, a pulling plate cake discharging mechanism, a filter cloth cleaning mechanism and a PLC program control system, wherein the diaphragm filter press can automatically filter-press concrete mud with the water content of 60-70% into mud cakes with the water content of 30-35%; the arranged squeezing water pump can be used for adding high-pressure water with the pressure of 1.7-1.8MPa into the squeezing cavity of the membrane filter press; the cloth washing water pump is a high-pressure water pump for washing filter cloth; the filter press platform is arranged, and a primary belt conveyor can be arranged below the filter press platform; the filter press protective cover is arranged and is an integrated filter press protective and deodorizing cover; the arranged belt horizontal conveyor is a horizontal belt filter cake conveyor shared by the two membrane filter presses; the scraper lifting conveyor is vertically butted with two belt horizontal conveyors and comprises a horizontal butted converging section and an inclined cantilever lifting section; the air compressor can input compressed air of 0.8-0.9 MPa into the air storage tank; the air storage tank can stably input 0.85MPa compressed air into the multiple filter chambers of the membrane filter press; the air cooling dryer is a refrigerating type compressed air dryer; and connecting the air compressor, the air cooling and drying machine and the air storage tank by utilizing pipelines to form an air compressor unit.

4. The midship mobile cutter suction and automatic pressure filtration sludge system of claim 1, wherein: the mud pushing machine is provided with a rotary mud pushing loading hopper; the capacity of the sludge bin is 1000m, the sludge bin can be arranged on one side close to the No. II filter pressing mud boat, and the No. III temporary mud cake boat can movably receive mud cakes conveyed by the scraper lifting conveyor.

5. A river dredging process is characterized in that: the middle-sized shipborne mobile cutter suction and automatic filter pressing silt system as claimed in claim 1 is used, the whole river dredging process is intelligently controlled by a PLC program control system, and the process flow is as follows;

step one, sucking sludge in a twisting way: a rotary reamer of the dredging machine loosens the sludge deposited on the river bottom; the sludge suction pump sucks the semi-fluid with 70-80% of water content of the loosened sludge with water into a sludge inlet groove of the No. I sludge suction dredger;

secondly, intercepting sundries: a sundry filter screen in the sludge tank intercepts and concentrates sundries with the size of more than 5mm in the water-carrying sludge, and the water-carrying sludge flows into a sedimentation thickening tank through the sundry filter screen;

thirdly, sedimentation and thickening: gravity settling the water-carrying sludge in a settling and thickening tank to obtain thick slurry with water content of 60-70%, and settling

The slurry pump inputs the thick slurry into a stirring coagulation pool; the upper layer purified water reaching the standard after sedimentation and purification overflows back into the river through a floating sieve;

fourth step, preparing medicament: automatically preparing polyacrylamide flocculant with concentration of 1.5-2 per mill, and adding the flocculant (flocculation)

Agent/filter cake or mud cake weight) of 0.6-0.7 per mill; the dosage is adjusted according to the water content of the filter cake, and the dosage with lower water content of the filter cake is correspondingly increased; preparing a medicament and settling and thickening are carried out synchronously;

fifthly, stirring and coagulating: the flocculant pump adds quantitative polyacrylamide flocculant into the stirring coagulation tank, and can also add

Adding a certain amount of lime coagulant aid into a stirring coagulation pond to aid coagulation, stirring and fully mixing to form a concrete slurry, sequentially pressurizing by 0.9-1.0MPa by four high-pressure feed pumps, and respectively inputting the concrete slurry into four diaphragm filter presses of a No. II filter pressing slurry ship;

sixth, mud is filtered and pressed: according to the single cycle period of the membrane filter press of 2 hours, the four membrane filter presses are staggered from each other by two

The working is circulated in an hour; firstly, carrying out static filtration under the pressure of 0.9-1.0MPa, then closing a high-pressure feed pump and a feed valve, carrying out variable-frequency pressure-maintaining by using a bulge membrane with the pressure of 1.7-1.8MPa for secondary application, squeezing a filter cake to dehydrate, inputting compressed air with the pressure of 0.85MPa into a multi-filter chamber of a membrane filter press by using an air compressor unit when necessary, further drying the filter cake, and carrying out filter pressing on concrete slurry to obtain mud cakes with the water content of 30-35% so as to meet the requirement of the external transportation of a truck, wherein the filtrate flows into a filtrate purifying tank, is subjected to sedimentation and purification to reach the standard, and the upper layer purified water with the SS value of <10mg/L overflows back into a river; after the filtration is completed, the filter plate is automatically pulled open, and the filter cake falls onto the belt horizontal conveyor by means of self gravity; when necessary, the filter cloth is automatically cleaned by using high-pressure water of 3.0 Mpa;

seventh, outputting mud cakes: the belt horizontal conveyor 209 and the scraper lifting conveyor are combined to convey mud cakes to the temporary storage No. III

In a sludge bin of the mud cake ship, a III temporary mud cake storage ship can movably receive mud cakes conveyed by a scraper lifting conveyor;

eighth step, loading and transferring: when the sludge cake of the sludge bin is accumulated and stored to a certain amount, namely <1000m, pushing is utilized on the quayside

The mud machine shovels mud cakes into a mud truck so as to be directly collected and transported to a long-term mud stacking field or to recycle waste materials.

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