CN-121990663-A - Water supply plant sedimentation tank floc recycling system, method and composite carrier material

Abstract

The invention discloses a water supply plant sedimentation tank floc recycling system and method and a composite carrier material, and belongs to the technical field of water treatment of water supply plants. The system comprises a monitoring and regulating module, a composite carrier material supply module, a floc reflux mechanism and a floc activation reactor, wherein the monitoring and regulating module is used for collecting floc state data of a sedimentation tank in real time and outputting a control signal according to the floc state data, the composite carrier material supply module is used for adding a composite carrier material into the floc activation reactor according to the control signal, the floc reflux mechanism is used for regulating recycled flocs entering the floc activation reactor according to the control signal, and the floc activation reactor is used for receiving the composite carrier material and the recycled flocs and performing three-stage activation treatment under the action of an internal flow field to obtain regenerated flocs. The method realizes solid waste recycling through floc recycling, reduces sludge discharge, and combines a fuzzy PID model and an LSTM model by a monitoring and regulating module to accurately match treatment requirements and improve operation stability. The invention solves the technical problem of recovery and reuse of the flocs.

Inventors

• ZHANG CHENGJIONG
• ZHANG HAOKUN
• ZHANG ZILU
• WU WEIHAO
• LIU RUNLIN
• ZHANG JINGSEN
• ZHOU ZHIBO
• WANG ZELIN
• Huo Yuntao
• XUE KE
• Sun Tangfeng
• SU ZHE
• ZHANG YAO
• HAO MENG
• ZHAO GE
• JIA SHENGYONG
• ZHONG JIAN
• MENG JIAWEN

Assignees

• 郑州楷润市政工程设计有限公司

Dates

Publication Date

20260508

Application Date

20260122

Claims (10)

1. 1. A water mill settling pond floc recycling system, the system comprising: The monitoring and regulating module is used for collecting the floc state data of the sedimentation tank in real time and outputting a control signal according to the floc state data; the composite carrier material supply module is used for adding composite carrier materials into the floc activation reactor according to the control signals; The flocculation backflow mechanism is used for adjusting recycled flocs entering the flocculation activation reactor according to the control signal; And the floc activation reactor is used for receiving the composite carrier material and the recycled flocs, and performing three-stage activation treatment under the action of an internal flow field to obtain regenerated flocs.
2. 2. The system of claim 1, wherein the monitoring and regulating module comprises: The floc state data comprise a turbidity value and a Zeta potential value of flocs; the water inlet area monitoring points, the reaction area monitoring points and the water outlet area monitoring points are sequentially arranged along the water flow direction of the sedimentation tank, and each monitoring point is provided with a turbidity sensor and a Zeta potential sensor.
3. 3. The system of claim 2, wherein the monitoring and regulating module comprises: Setting a fuzzy PID control model, setting a turbidity threshold interval to be 2-8 NTU and a Zeta potential threshold interval to be-15 mV-5 mV, establishing a flocculation state evaluation matrix through a membership function, and outputting the control signal; the prediction compensation model dynamically corrects the control signal based on historical operation parameters through an LSTM neural network; the control signals comprise a floc backflow control signal, a carrier addition control signal and a floc addition control signal.
4. 4. A system according to claim 3, wherein the system further comprises: The variable-frequency screw rod pump is arranged on the floc backflow mechanism and is used for controlling the backflow ratio of the recycled flocs according to the floc backflow control signal; the weightless feeder is arranged on the composite carrier material supply module and is used for controlling the adding amount of the composite carrier material according to the carrier adding control signal; and a floc adding pump arranged between the floc activating reactor and the reaction area of the sedimentation tank and used for controlling the adding amount of the regenerated flocs according to the floc adding control signal.
5. 5. The system of any one of claims 1 to 4, wherein the floc activation reactor is a cyclonic floc activation reactor comprising: The main material of the floc activation reactor is a vertical cylindrical reactor with a main structure, a tangential water inlet is arranged at the top, and a conical separation chamber is arranged at the bottom; the inside of the floc activation reactor is provided with a three-stage activation unit which comprises a primary crushing area, a carrier loading area, a regeneration strengthening area and an ultrasonic transducer, wherein the primary crushing area is provided with a spiral guide plate; The flocculation activation reactor is matched with a magnetic separation device and consists of a permanent magnet array and a mud scraping mechanism.
6. 6. The system of claim 5, wherein the floc activation reactor comprises: The height-diameter ratio of the vertical cylindrical reactor is 3:1, the flow speed of the tangential water inlet is 1.5-3.0 m/s, and the cone angle of the conical separation chamber is 60 degrees; the inclination angle of the spiral guide plate is 45 DEG, and the generated shear rate is 200-500 DEG The aperture of the porous aeration ring is 0.5mm, the aeration intensity is 2-5L/min, the frequency of the ultrasonic transducer is 28kHz, and the power density is 0.3W/c ; The magnetic field intensity of the permanent magnet array is 0.3-0.5T.
7. 7. The system of any one of claims 1 to 4, wherein the composite carrier material is The @ attapulgite-chitosan comprises a core-shell structure magnetic carrier, a three-dimensional mesoporous network and a functional coating; The core-shell structure magnetic carrier comprises an inner core Magnetic nanoparticles, surface coating A mesoporous layer; the three-dimensional mesoporous network is grafted on the three-dimensional mesoporous network by attapulgite Forming a mesoporous layer on the surface; the functional coating is formed by loading quaternized modified chitosan on the surface of the three-dimensional mesoporous network in an electrostatic self-assembly mode.
8. 8. The system of claim 7, wherein the composite carrier material comprises: The core of the core-shell structure magnetic carrier is 50-100 nm in particle size The magnetic nano particles are coated with a layer of 10-20 nm thick A mesoporous layer; the three-dimensional mesoporous network is grafted on the attapulgite through a silane coupling agent A mesoporous layer surface is formed, wherein the attapulgite is bonded with The mass ratio of the mesoporous network is 1:3, and the pore diameter of the formed mesoporous network is 2-10 nm; The thickness of the functional coating is 200-500 nm, and the quaternization substitution degree of the chitosan is more than or equal to 85%; the overall specific surface area of the composite carrier material is more than or equal to 350m < 2 >/g, the saturation magnetization is more than or equal to 45 emu/g, and the Zeta potential of the surface of the composite carrier material is in the range of +25mV to +35 mV.
9. 9. A method for recycling flocs in a settling pond of a water supply plant, applied to a system according to any one of claims 1 to 8, comprising: collecting floc state data of a sedimentation tank in real time, and calculating to obtain a control signal through a fuzzy PID algorithm according to the floc state data; controlling the floc reflux mechanism according to the control signal, and adjusting recycled flocs entering the floc activation reactor; controlling the composite carrier material feeding of the composite carrier material feeding module according to the control signal; Performing tertiary activation treatment on the recycled flocs through a floc activation reactor to obtain regenerated flocs; And (3) re-throwing the regenerated flocs into a reaction zone of a sedimentation tank.
10. 10. A composite carrier material is characterized in that the composite carrier material is The @ attapulgite-chitosan comprises a core-shell structure magnetic carrier, a three-dimensional mesoporous network and a functional coating; The core-shell structure magnetic carrier comprises an inner core Magnetic nanoparticles, surface coating A mesoporous layer; the three-dimensional mesoporous network is grafted on the three-dimensional mesoporous network by attapulgite Forming a mesoporous layer on the surface; the functional coating is formed by loading quaternized modified chitosan on the surface of the three-dimensional mesoporous network in an electrostatic self-assembly mode.

Description

Water supply plant sedimentation tank floc recycling system, method and composite carrier material Technical Field The invention relates to the technical field of water supply treatment, in particular to a water supply plant sedimentation tank floc recycling system and method and a composite carrier material. Background In the water supply treatment process, the low turbidity water body (such as reservoir water, deep groundwater and the like) with the raw water turbidity lower than 10 NTU has the characteristics of low colloid particle concentration, small specific surface area, higher Zeta potential and the like, so that the traditional flocculation process faces the great challenges of strong colloid stability, limited floc growth, unbalanced medicament addition and the like. Firstly, brownian motion of colloid particles in low-turbidity water is dominant, electrostatic repulsion between charged colloids prevents effective collision, conventional aluminum/ferric salt coagulants are difficult to form stable adsorption bridging, meanwhile, the quantity of flocculation cores is insufficient due to low-concentration suspended particles, the formed micro-flocs are low in density and poor in sedimentation performance, turbidity of effluent of a sedimentation tank is easy to exceed standard, secondly, in order to compensate flocculation effect, coagulant is added in excess of a water plant, water production cost is increased, and secondary risks such as exceeding standard of residual aluminum ions and aggravation of pipe network corrosion are caused. Aiming at the problems, the current technology for improving the flocculation of low turbid water mainly comprises three types of (1) a chemical strengthening method, namely, adding a coagulant aid, a compound coagulant or a pH regulator to strengthen the electric neutralization and adsorption bridging capability, but the method has the problems of sensitive medicament compatibility, low residual risk of organic matters and the like, and cannot solve the fundamental defects of loose structure of the flocs, (2) a physical strengthening method, namely, adopting micro sand loading, magnetic separation or ultrasonic pretreatment to promote the aggregation of the flocs by introducing exogenous particles or energy input, wherein the technology can shorten the flocculation time, has high equipment transformation cost and complex operation and maintenance and is difficult to popularize in a traditional water plant, and (3) a biological/carrier strengthening method, namely, a biological flocculation bacteria or porous carrier material (such as zeolite and active carbon) is used for constructing a floc growth carrier, but the method has the bottleneck of long group domestication period, poor low-temperature adaptability and the like, and a static carrier material is easy to saturate and needs frequent back flushing. However, the actual application of the prior art is rough, the overload of the floccules in the high turbidity stage and the insufficient reflux quantity in the low turbidity stage are often caused, meanwhile, the carrier has single function, only depends on the physical adsorption of the reflux floccules, lacks chemical modification and structural reinforcement on the surface active sites of the floccules, and secondly, the system suitability is poor, so that the traditional reflux pipe is blocked, and the traditional reflux pipe is not cooperatively controlled with the traditional medicine adding system, so that the actual operation stability is insufficient. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a water supply plant sedimentation tank floc recycling system, a water supply plant sedimentation tank floc recycling method and a composite carrier material, and aims to solve the problem of floc throwing in the prior art. In order to achieve the above object, the present application provides the following solutions: The application provides a water supply plant sedimentation tank floc recycling system which is characterized by comprising a monitoring and regulating module, a composite carrier material supply module, a floc backflow mechanism and a floc activation reactor, wherein the monitoring and regulating module is used for collecting floc state data of a sedimentation tank in real time and outputting a control signal according to the floc state data, the composite carrier material supply module is used for adding a composite carrier material into a floc activation reactor according to the control signal, the floc backflow mechanism is used for regulating recycled flocs entering the floc activation reactor according to the control signal, and the floc activation reactor is used for receiving the composite carrier material and the recycled flocs and performing three-stage activation treatment under the action of an internal flow field to obtain regenerated flocs. The application provides a method for recycling flocs