CN-121591389-B - Environment-friendly full-scene drainage circulation system of concrete mixing station and control method

CN121591389BCN 121591389 BCN121591389 BCN 121591389BCN-121591389-B

Abstract

The invention belongs to the technical field of wastewater treatment, and particularly discloses a full-scene drainage circulation system of an environment-friendly concrete mixing station and a control method, wherein the system comprises a sand-stone separator, a high-frequency dewatering screen, a centrifugal separation tank and a homogenizing adjusting tank; the high-frequency dewatering screen is arranged at an overflow port of the sand-stone separator, a sand outlet end and a mud outlet end are arranged at an outlet of the high-frequency dewatering screen, the centrifugal separation tank is connected to the mud outlet end of the high-frequency dewatering screen, the overflow port is connected with a clear water recycling tank, a bottom flow port is connected with a gravity separator, the effective components screened by the gravity separator enter a homogenizing adjustment tank, a pneumatic pulse array is arranged in the homogenizing adjustment tank to circularly stir the effective components, a density proportioning unit is arranged in the homogenizing adjustment tank to adjust the concentration of slurry in the homogenizing adjustment tank, and the slurry with the standard concentration is used as production water to be input into the concrete mixer to produce concrete. The sand aggregates in the sewage are recycled in a grading way, so that the full-flow closed-loop utilization and zero emission of waste residues and waste water are realized.

Inventors

CHENG JINPING
DING YANG
ZHANG SULIN
WEI JIAYUAN
CHEN YU
Pan Baishuang
LIU HAI
YUE JIAO
LIU HAIDONG
LI BIN
LI YE
GUI HAIBO
YANG XIANG

Assignees

中交二航局第四工程有限公司
中交第二航务工程局有限公司
广西桂贺高速公路有限公司

Dates

Publication Date: 20260512
Application Date: 20260129

Claims (7)

1. The full-scene drainage circulation system of the environment-friendly concrete mixing station is characterized by comprising a sand-stone separator, a high-frequency dewatering screen, a centrifugal separation tank and a homogenizing adjusting tank; the sand-stone separator is used for preprocessing discharge port cleaning sewage, tank car cleaning sewage, site sewage and bin drainage; The high-frequency dewatering screen is arranged at an overflow port of the sand-stone separator, water pretreated by the sand-stone separator is connected into the high-frequency dewatering screen, and a sand outlet end and a mud outlet end are arranged at an outlet of the high-frequency dewatering screen and respectively output fine sand and muddy water; the centrifugal separation tank is connected to the mud outlet end of the high-frequency dewatering screen, mud and water output by the high-frequency dewatering screen are separated, an overflow port of the centrifugal separation tank is connected with a clear water recycling tank, and a bottom flow port of the centrifugal separation tank is connected with a gravity separator; The gravity separator collects concentrated waste slurry output from a bottom flow port of the centrifugal separation tank, screens particles in the concentrated waste slurry, and the screened effective components enter a homogenizing adjustment tank; The device comprises a homogenizing adjusting tank, a plurality of homogenizing adjusting tanks, a plurality of air-driven pulse arrays, a plurality of air-driven pulse nozzles and a plurality of air-driven pulse nozzles, wherein the air-driven pulse arrays are arranged in the homogenizing adjusting tank in a layered mode, and the air-driven pulse arrays are used for circularly stirring effective components in the homogenizing adjusting tank; The homogenizing adjusting tank is internally provided with a density proportioning unit, the concentration of the slurry in the homogenizing adjusting tank is regulated in an auxiliary way, and the slurry with the concentration reaching the standard is used as production water to be input into a concrete mixer for producing concrete; after the separated water containing effective particles enters the homogenizing adjusting tank, alternating air injection is carried out through pulse nozzles arranged in the homogenizing adjusting tank, and intermittent stirring is carried out on the separated water, so that particle precipitation hardening in the separated water is avoided; The homogenizing adjusting tank is a slender cylindrical tank body, a feed inlet is arranged at the top end of the tank body, a discharge outlet is arranged at the bottom end of the tank body, an overflow port for preventing the tank from being full is further arranged at the top end, the pulse nozzle is provided with three layers, namely an arch breaking layer arranged at the bottom layer, a main mixing layer arranged at the middle layer and a perturbation layer arranged at the top layer, and a plurality of nozzles are arranged in each layer; The arch breaking layer is used for aiming at heavy particles to prevent heavy particle deposition, the main mixing layer is used for aiming at thick slurry, carrying the thick slurry to the top end to realize up-and-down circulation, and the perturbation layer is used for aiming at the inner surface of the liquid level to prevent particles from crusting on the inner wall of the homogenizing adjusting tank at the liquid level.
2. The full-scene drainage circulation system of the environment-friendly concrete mixing station according to claim 1, wherein an overflow port of the sand-stone separator is connected into a feeding box of a high-frequency dewatering screen through a chute or a pipeline, and a high-pressure spray water pipe is arranged on the high-frequency dewatering screen to flush separated fine sand, prevent sand from being coated with mud and improve the cleanliness of the fine sand.
3. The full scene drainage circulation system of the environment-friendly concrete mixing station according to claim 2, wherein the fine sand separated in the high-frequency dewatering screen is directly conveyed to a raw material warehouse for making concrete, the separated muddy water enters an intermediate buffer tank, and the muddy water is pumped into a centrifugal separation tank from the intermediate buffer tank by a slurry pump; the centrifugal separation tank is a hydrocyclone with a cone structure, a sand settling nozzle is arranged in a bottom flow port of the hydrocyclone, the diameter of the sand settling nozzle is variable, and the concentration of bottom flow is controlled by adjusting the diameter of the sand settling nozzle so as to output high-concentration waste slurry.
4. The full-field drainage circulation system of the environment-friendly concrete mixing station according to claim 3, wherein the gravity separator is a spiral chute gravity separator, and the high-concentration waste slurry output by the bottom flow of the centrifugal separation tank is separated according to the density difference of effective particles and ineffective particles after entering the gravity separator; The effective particles comprise unhydrated cement particles and fine sand stone powder, the ineffective particles comprise hydrated cement gel, clay impurities and floccules, and the density of the effective particles is higher than that of the ineffective particles; The effective particles can move against the inner ring of the spiral chute in the gravity separator due to the higher density, and the ineffective particles float on the surface of water flow due to the low density and are thrown to the outer ring of the spiral chute.
5. The full-scene drainage circulation system of the environment-friendly concrete mixing station according to claim 4, wherein the density proportioning unit comprises a test tube arranged at the bottom end of the homogenizing adjustment tank, a test pump and a three-way valve are arranged on the test tube, one end of the three-way valve is connected to a metering scale, the other end of the three-way valve flows back into the homogenizing adjustment tank, a densimeter and a flowmeter are arranged at the end of the test pump, the densimeter is used for measuring the density of output water at the bottom end of the homogenizing adjustment tank, the flowmeter is used for measuring the flow rate in the test tube, the frequency of the test pump is controlled in a feedback manner, and the influence degree of particle deposition caused by the too slow flow rate of liquid in the test tube is avoided; the density proportioning unit also comprises a clean water supplementing valve, the clean water supplementing valve is connected into the homogenizing adjusting tank, and the liquid density in the homogenizing adjusting tank is controlled by adjusting the flow of the separated water containing effective particles and the clean water which are input into the homogenizing adjusting tank.
6. The full-field drainage circulation system of the environment-friendly concrete mixing station according to claim 5, wherein after the density of the liquid in the homogenizing adjusting tank is adjusted constantly, the liquid is output to the concrete mixer in a fixed density range, the slurry output by the homogenizing adjusting tank is used as water required for mixing concrete, and the effective particles in the slurry are directly used as raw materials for mixing, so that the input amount of the raw materials is correspondingly reduced.
7. A method for controlling a full scene drainage circulation system of an environment-friendly concrete mixing station as claimed in any one of claims 1 to 6, comprising the steps of: S100, collecting sewage of a stirring station, introducing the sewage into a sand-stone separator to pretreat and separate large-particle sand stone, controlling an overflow port chute or a pipeline to be opened, introducing a water body into a high-frequency dewatering screen, starting high-pressure spraying and flushing fine sand to improve cleanliness, then delivering the water body into a raw material warehouse, and introducing muddy water into an intermediate buffer tank; S200, diluting muddy water with water of Chi Jiaqing, eluting impurity ions on the surfaces of particles, starting a slurry pump to pump the muddy water into a centrifugal separation tank, adjusting the caliber of a sand settling nozzle to control the concentration of underflow and output high-concentration waste slurry, and filtering overflow impurity-containing water to be used for washing vehicles and cleaning places of a stirring station; s300, introducing high-concentration waste slurry into a spiral chute gravity separator, separating the high-concentration waste slurry from the effective particles by utilizing the density difference of the effective particles and the ineffective particles, enabling the effective particles to move close to the inner ring of the chute, enabling the ineffective particles to float to the surface and swing to the outer ring, and accurately realizing the classified screening of the two types of particles; S400, pumping the separation water containing effective particles into a homogenizing adjusting tank, delivering the ineffective particle separation water into a filter press for treatment, transporting out mud cakes, discharging or recycling filtrate after reaching standards, starting a pneumatic pulse array, and alternately spraying and stirring in layers to prevent particle deposition, layering and inner wall crusting; S500, starting a density proportioning unit, starting a test pump and a three-way valve, monitoring data through a densimeter and a flowmeter, feeding back and adjusting pump frequency to avoid particle deposition, adjusting a clean water supplementing valve, controlling water inflow, and adjusting the concentration of slurry in a tank to a set range and keeping stable; S600, delivering the standard-reaching slurry into a concrete mixer, and reducing the input amount of raw materials according to the content of effective particles to realize the closed-loop utilization and zero discharge of waste residues and waste water.

Description

Environment-friendly full-scene drainage circulation system of concrete mixing station and control method Technical Field The invention belongs to the technical field of wastewater treatment, and particularly relates to a full-scene drainage circulation system of an environment-friendly concrete mixing station and a control method. Background The concrete mixing plant is used as a core production base for infrastructure construction, and a large amount of wastewater can be generated in the daily operation process, whether the mixing host machine is cleaned, the transportation vehicle is washed or the rainwater in the field is collected. The mixing plant drainage system is an important component of the field infrastructure and has the main function of efficiently collecting, transporting and treating the production and domestic sewage to ensure that the field is free of ponding and production is continuously carried out. In the prior art, most of traditional drainage systems of stirring stations adopt a scheme for expressing drain sewage. According to the scheme, open concrete or brick trenches are excavated on the ground according to the topography of a field, and various sewage generated in the field is collected and guided to flow to a sedimentation tank or a tail-end water collecting pit by utilizing the gravity flow principle. The open ditch drainage mode is widely applied to early stirring station construction due to simple structure, convenient construction and low initial construction cost, and is a common pollution discharge means at present. However, in practical application, the conventional open ditch sewage disposal mode has a plurality of defects which are difficult to overcome. Firstly, the operation and maintenance difficulty is high, and the cost is high, a large amount of sand and stone aggregates and cement paste are mixed in the sewage of the stirring station, so that the sediment is extremely easy to harden at the bottom of the ditch, the open ditch is frequently blocked, once the open ditch is blocked, the sewage overflows, the civilized image of a construction site is seriously damaged, a large amount of manpower is consumed for regular dredging, and the management difficulty and the labor cost are increased. Secondly, the hidden trouble of environmental pollution is serious, the sewage of the mixing plant usually contains various concrete additives, the traditional open trench system often lacks perfect seepage prevention and sealing measures, and the sewage containing chemical agents can seriously damage the surrounding soil environment, the underground water body and the natural ecological system if the sewage is directly discharged untreated or leaked through a trench. Disclosure of Invention Aiming at the defects or improvement demands of the prior art, the invention provides an environment-friendly full-scene drainage circulation system of a concrete mixing station and a control method, which solve the technical problems that the conventional drainage system of the mixing station is blocked in open trenches due to mud and sand deposition and the ecological environment is damaged by directly discharging sewage containing additives by adopting a sand-stone separator, a high-frequency dewatering screen and a centrifugal separation tank to carry out multistage physical separation and solid-liquid separation on sewage and matching a homogenizing adjusting tank provided with a pneumatic pulse array. The sand and stone aggregates in the sewage are recycled in a grading manner, and the concentrated waste slurry is directly used as production raw materials for concrete stirring in a state of no precipitation and controllable concentration, so that the environmental protection effects of full-flow closed-loop utilization and zero emission of waste residues and waste water are realized. In order to achieve the above object, according to a first aspect of the embodiments of the present invention, there is provided an environment-friendly full-scene drainage circulation system of a concrete mixing station, comprising a sand-stone separator, a high-frequency dewatering screen, a centrifugal separation tank and a homogenization adjustment tank; the sand-stone separator is used for preprocessing discharge port cleaning sewage, tank car cleaning sewage, site sewage and bin drainage; The high-frequency dewatering screen is arranged at an overflow port of the sand-stone separator, water pretreated by the sand-stone separator is connected into the high-frequency dewatering screen, and a sand outlet end and a mud outlet end are arranged at an outlet of the high-frequency dewatering screen and respectively output fine sand and muddy water; the centrifugal separation tank is connected to the mud outlet end of the high-frequency dewatering screen, mud and water output by the high-frequency dewatering screen are separated, an overflow port of the centrifugal separation tank is connected with a clear wate