Dispersed domestic sewage treatment equipment residual sludge discharge and cleaning method and system

Abstract

The present application relates to a kind of decentralized domestic sewage treatment equipment residual sludge discharge and system, method includes the following steps: establish the connection with decentralized domestic sewage treatment equipment, based on the water quality and water quantity in a period of time and the equipment residual sludge production coefficient of pre-set, calculate the dry sludge production forecast value M in this period of time, when meeting the pre-set discharge condition, send sludge pre-concentration discharge control instruction to the domestic sewage treatment equipment, realize the discharge of residual sludge after pre-concentration processing;Based on the dry sludge production forecast value M, calculate the non-dry sludge volume V to be cleaned in a cleaning cycle, determine target domestic sewage treatment equipment and utilize cleaning truck to clean up.Compared with prior art, the present application can greatly reduce the moisture content of sludge transportation, reduce the volume of sludge treatment, reduce the input of manpower and material resources, reduce the cost input of sludge treatment, and has strong application prospect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sludge discharge and removal, and particularly relates to a method and system for discharging and removing residual sludge of a decentralized domestic sewage treatment device. BACKGROUND

[0002] In the current application scenarios of rural sewage treatment, a considerable number of villages have built village sewage collection and treatment systems. However, as rural sewage treatment facilities continue to improve, the amount of rural sludge is also increasing year by year. Due to the scattered residence points in China's rural areas and the small scale of sewage treatment facilities, it is difficult to equip on-site sludge disposal facilities for this situation. The common sludge disposal method at present is to collect the sludge at each site by a sludge removal vehicle and transport it to a sewage plant or other centralized treatment place for disposal. However, the quality and quantity of rural domestic sewage fluctuate greatly, resulting in a large difference in sludge production at different sites. When the removal vehicle arrives at the site, the problem of not being filled or not being cleaned in time often occurs. In addition, the sludge discharged by traditional sewage treatment equipment has a high water content and a large volume, resulting in a large investment cost and low efficiency of the sludge removal vehicle collection and treatment method. Moreover, the "leakage" problem often occurs during transportation, causing secondary pollution along the way.

[0003] In view of the above problems, Chinese Patent Publication No. CN 113271546 B provides a garbage collection and transportation intelligent management platform. The invention uses an intelligent management platform to receive data information from a garbage overflow positioning terminal, plans the route of the garbage collection and transportation vehicle, and realizes efficient collection and transportation of garbage, solving the problem of transportation capacity scheduling of the garbage collection and transportation vehicle. However, the invention uses a garbage overflow positioning terminal to obtain garbage quantity information. The freshly discharged rural sewage sludge has a high water content, and if similar sensing components are used to send sludge quantity information, most of the sludge extracted by the removal vehicle will be water, which is large in volume and low in efficiency.

[0004] Aiming at the problem of high moisture content of rural sewage sludge, China Patent Publication No. CN 207760211 U provides a mobile sludge dewatering equipment. The patent proposes a mobile sludge dewatering equipment which integrates sewage suction, medicine supply, flocculation, dewatering, storage and transportation, and power supply in one, solves the sludge cleaning and transportation problem of distributed, small, especially rural sewage treatment facilities, and makes sludge cleaning and transportation reduction, which facilitates further centralized and resourceful treatment of sludge. And using one equipment can realize sludge dewatering treatment of multiple sewage treatment facilities, which is convenient and low in cost. Further, China Patent Publication No. CN210915801 U upgrades the mobile treatment device for rural sewage sludge on the basis of the concept and provides a mobile comprehensive service device for decentralized rural sewage treatment, which can simultaneously, efficiently, conveniently and low-costly solve the problems of sludge treatment and disposal, water quality sampling and detection, daily inspection and maintenance, debugging and operation management and other field comprehensive operation and maintenance problems in decentralized rural sewage treatment project. However, the above patents do not consider the scheduling problem of mobile treatment equipment. The water quality and quantity of rural sewage treatment sites are quite different, and the corresponding sludge production is quite different, and there is seasonal fluctuation. If a fixed line scheduling mode is adopted, the problem of not timely treatment or low treatment capacity after arrival will occur, which greatly reduces the effectiveness and economy of sludge treatment.

[0005] For sludge transportation demand scheduling problem, China Invention Publication No. CN 107133688 A provides an internet-based mobile dredging sludge treatment operation and management system and method. The system mentioned in the application contains a sludge treatment vehicle scheduling module, which sends sludge treatment demand information by using a mobile internet terminal. However, the scheduling module needs to be manually sent by the on-site operator, which increases the labor cost.

[0006] In summary, there is currently a lack of a systematic scheme for discharging and transporting residual sludge of domestic sewage treatment equipment to solve the problems existing in the prior art. SUMMARY

[0007] The purpose of the present application is to provide a decentralized domestic sewage treatment equipment residual sludge discharge and transportation method and system to improve the efficiency of sludge transportation.

[0008] The purpose of the present application can be achieved by the following technical solutions:

[0009] In one aspect of the present application, a decentralized domestic sewage treatment equipment residual sludge discharge and transportation method is provided, comprising the following steps:

[0010] The connection with the decentralized domestic sewage treatment equipment is established, the absolute dry sludge yield prediction value M in a period is calculated based on the water quality and water quantity of the influent in the period and the preset equipment residual sludge yield coefficient, and when the preset discharge condition is met, the sludge pre-concentration discharge control instruction is sent to the domestic sewage treatment equipment, and the discharge of the residual sludge is realized after the pre-concentration treatment.

[0011] Based on the absolute dry sludge yield prediction value M, the non-absolute dry sludge volume V to be cleaned and transported in a cleaning and transporting cycle is calculated, the target domestic sewage treatment equipment for cleaning and transporting is determined, and the cleaning and transporting vehicle is used for cleaning and transporting.

[0012] As a preferred technical solution, the process of realizing the discharge of the residual sludge comprises the following steps:

[0013] The sludge reflux pump is controlled to be closed for A minutes, the pre-concentration before the discharge of the sludge is completed, the sludge discharge electric valve is kept open for the last B minutes in the A-minute cycle, the sludge reflux pump is restored after B minutes, and the sludge discharge electric valve is closed, so that the discharge of the residual sludge is realized.

[0014] As a preferred technical solution, the preset discharge condition is that the total cumulative value W of the absolute dry sludge yield prediction reaches the preset discharge value X or an integer multiple of X.

[0015] As a preferred technical solution, the determination of the target domestic sewage treatment equipment for cleaning and transporting is specifically:

[0016] The domestic sewage treatment equipment with the non-absolute dry sludge volume V greater than a preset value is selected as the first target domestic sewage treatment equipment, the first target domestic sewage treatment equipment is taken as the basic coordinate, the nearest n sites are selected in the fan radiation direction towards the sludge storage terminal, and the finally selected target domestic sewage treatment equipment is obtained.

[0017] As a preferred technical solution, the absolute dry sludge yield prediction value M is calculated by the following formula:

[0018] M=C*Q*Y

[0019] Wherein, M is the absolute dry sludge yield prediction value in the period, C is the average concentration of influent water quality COD in the period, Q is the cumulative total amount of influent, and Y is the equipment residual sludge yield coefficient.

[0020] As a preferred technical solution, the non-absolute dry sludge volume V to be cleaned and transported is calculated by the following formula:

[0021] V=△W*P / Z

[0022] Wherein, V is the non-absolute dry sludge volume to be cleaned and transported, △W is the absolute dry sludge mass in a predicted cleaning and transporting cycle, P is the sludge pool re-compression coefficient, and Z is the equipment discharged sludge concentration.

[0023] As a preferred technical solution, after the cleaning and removal by the cleaning and removal vehicle, further comprising:

[0024] The volume value of the cleaning and removal vehicle actually extracting sludge from each domestic sewage treatment equipment is collected, and the residual sludge production coefficient of the equipment is calibrated.

[0025] As a preferred technical solution, the residual sludge production coefficient of the equipment is determined according to the specific process and sludge age of the decentralized domestic sewage treatment equipment, combined with the actual production of dry sludge.

[0026] As a preferred technical solution, the cleaning and removal vehicle is used to clean and remove the sludge in the sludge pool of the target domestic sewage treatment equipment without supernatant.

[0027] Another aspect of the present application provides a residual sludge discharge and removal system for a decentralized domestic sewage treatment equipment, comprising:

[0028] A cloud service module is configured to establish a connection with the decentralized domestic sewage treatment equipment, and collect water quality and water quantity information;

[0029] An equipment dry sludge production prediction module is configured to calculate a dry sludge production prediction value M based on the water quality and water quantity information and a pre-set residual sludge production coefficient of the equipment;

[0030] An equipment sludge pre-concentration discharge remote control module is configured to calculate a dry sludge production prediction total cumulative value W based on the dry sludge production prediction value M, and send a sludge pre-concentration discharge control instruction to the corresponding domestic sewage treatment equipment when the total cumulative value W reaches a pre-set discharge value X or an integer multiple of X, so as to realize the discharge of residual sludge after pre-concentration treatment;

[0031] An equipment sludge pool removal volume calculation module is configured to generate a sludge removal vehicle task route and instruction based on the dry sludge production prediction value M.

[0032] Compared with the prior art, the present application has the following advantages:

[0033] (1) Improve the effectiveness of sludge collection and removal: In view of the problem that decentralized rural sewage treatment sites are scattered, not gathered, and the water quality and quantity change greatly, resulting in large changes in sludge production, the present application relies on actual water quality and quantity, combines the pre-set residual sludge production coefficient of the equipment to predict the dry sludge production, realizes the discharge of residual sludge based on the prediction value, and plans the removal route of the cleaning and removal vehicle using the non-dry sludge volume to be removed, compared with the traditional mode, this method reduces the occurrence of no sludge to be pumped after the arrival of the sludge removal vehicle or overflow due to the late arrival.

[0034] (2) Improve the concentration of discharged sludge, reduce the sludge cleaning frequency: in view of the problem that the traditional equipment discharges sludge with high moisture content, and the excess water squeezes the capacity of the sludge storage tank attached to the site, the present application can fully utilize the sludge concentration capacity of the equipment sedimentation tank by setting the equipment sludge discharge pre-concentration remote control module, and can reduce water disturbance and improve sedimentation effect by stopping the sludge backflow system before discharging sludge, so as to improve the concentration of discharged sludge, reduce the moisture content, prolong the storage time of the sludge storage tank of the site, and greatly reduce the sludge cleaning frequency.

[0035] (3) The sludge cleaning and transporting vehicle has high cleaning and transporting efficiency: the present application determines the target domestic sewage treatment equipment and uses the cleaning and transporting vehicle to clean and transport, which can fully utilize the pre-concentration capacity of the sludge storage tank, reduce the moisture content of the sludge to be extracted, and reduce the volume of the sludge. In addition, taking one main site as the center, the sludge cleaning and transporting vehicle radiates to the surrounding sites, fully considers the sludge storage capacity of the site, and improves the efficiency and economy of sludge cleaning and transporting. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a schematic diagram of a residual sludge discharge and cleaning system for a decentralized domestic sewage treatment equipment. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0038] Embodiment 1

[0039] Referring to Figure 1 , in view of the problems of the prior art mentioned above, the present embodiment provides a residual sludge discharge and cleaning system for a decentralized domestic sewage treatment equipment, which is a subsystem of a decentralized domestic sewage intelligent operation and management platform, and includes an equipment absolute dry sludge yield prediction module, an equipment sludge discharge pre-concentration remote control module, an equipment sludge tank cleaning and transporting amount calculation module, a sludge cleaning and transporting vehicle cleaning and transporting target planning module, and a cloud service module.

[0040] The device absolute dry sludge production prediction module has two functions. The first function is to predict and calculate the residual sludge produced by the corresponding device in a period of time according to the statistical data of the water inflow quantity and water quality of a large number of decentralized rural domestic sewage treatment devices in the period of time. The calculation method is M=C*Q*Y / 1000. The second function is to predict the sludge production in a specific period of time according to the historical period sludge production statistical data. Wherein, M is the total absolute dry sludge production in the period of time, the unit is kilogram, C is the average concentration of water inflow COD in the period of time, the unit is mg / L, Q is the total cumulative water inflow, the unit is cubic meter, and Y is the coefficient of residual sludge production of the device. According to the specific process of the running device and the sludge age, the operation and maintenance personnel adjust the parameters in the background according to the actual residual sludge production feedback data.

[0041] The device sludge pre-concentration discharge remote control module has the function of triggering cloud control when the total cumulative value W of the absolute dry sludge production of the device reaches the set discharge value X and the integer multiple of X, and sending the device sludge pre-concentration discharge control instruction to the device terminal receiving module. The instruction is that the device sludge backflow pump is closed for A minutes, the sludge discharge electric valve is kept open for the last B minutes in the A-minute period, and the device sludge backflow pump is restored and the sludge discharge electric valve is closed after B minutes. Preferably, A is 30 minutes, and the sludge discharge electric valve opening time B is optimized according to the feedback of the on-site personnel.

[0042] The device sludge tank cleaning and transporting quantity calculation module has the function of predicting and calculating the non-absolute dry sludge quantity accumulated in the sludge tank of the device in a cleaning and transporting period according to the predicted absolute dry sludge quantity △W discharged by the device in the period, that is, the actual dilute sludge quantity containing a large amount of water. The calculation method is that the non-absolute dry sludge volume V of the device sludge tank in the period is △W*P / Z, and the value range of Z is 8-20 (kg / m3), and P is the sludge tank re-compression coefficient, and the value range is 0.5-1.

[0043] The calculation process of △W is as follows. Assuming that the cleaning and transporting period is a month, then △W=C*Q (1-month cumulative flow)*Y / 1000, and the △W of June is W (July 1)-W (June 1).

[0044] The sludge cleaning and transporting vehicle cleaning and transporting target planning module has the function of planning the cleaning and transporting target of the vehicle based on the grid route map composed of the cleaning and transporting vehicle starting point and the storage end point, and the grid route map containing the device station between the cleaning and transporting vehicle starting point and the sludge storage end point. According to the transportation capacity T of the cleaning and transporting vehicle and the cleaning and transporting target quantity Vn of each device sludge tank of the cleaning and transporting vehicle, the cleaning and transporting target of the vehicle is planned. The planning principle is that 1, the first target station triggers the cleaning and transporting demand V1≥2 cubic meters, 2, the first target station is taken as the coordinate, and the nearest n stations are selected in the fan radiation direction to the sludge storage end point, which meets n≥4, 0.5≤Vn≤2 cubic meters, and ∑Vn=V1.n+1 = T.

[0045] The cloud service module functions as receiving data and sending data, accepts a large amount of data transmitted by a large number of distributed devices in real time, and stores the data in the data storage module; at the same time, the cloud service module sends the sludge cleaning target instruction to the sludge cleaning vehicle receiving end and sends the device sludge pre-concentration discharge control instruction to the device terminal receiving module.

[0046] The above scheme is applied to a rural sewage treatment project in a county range in the eastern region, and the sludge of 121 distributed rural sewage treatment devices in the project is disposed.

[0047] The application before and after the application can be known, through the application of the device sludge pre-concentration discharge remote control module, the sludge concentration discharged from the device sedimentation tank is increased from the original 5000-8000 mg / L to 9000-15000 mg / L, which greatly reduces the water content of the discharged sludge. In addition, by using the device absolute dry sludge production prediction module and the sludge cleaning vehicle cleaning target planning module, the transportation capacity demand of each site can be accurately calculated, so that each dispatched cleaning vehicle is in full load state before reaching the sludge disposal point. Compared with before the application of the application, based on the transportation of the same amount of absolute dry sludge, the transportation time can be reduced by 40%-50%, and the mileage and fuel consumption are saved by more than half, which greatly improves the economy and rationality of the sludge cleaning system.

[0048] The device absolute dry sludge production prediction module provided by the application can be based on online big data real-time analysis to obtain the sludge production of each site, and provides reliable data support for subsequent sludge treatment. The device sludge pre-concentration discharge remote control module innovates the sludge discharge mode, fully utilizes the sludge pre-concentration capacity of the device sedimentation tank, reduces the water content of the discharged sludge, and improves the storage capacity of the sludge storage tank. The device sludge pool cleaning capacity calculation module is used with the aforementioned device absolute dry sludge production prediction module, which can further reduce the water content of the sludge to be extracted at the site and reduce the volume of the sludge; in addition, a reasonable and scientific treatment route can be planned for the sludge cleaning vehicle, taking a main site as the center, guiding the sludge cleaning vehicle to radiate around the site, fully considering the key factors such as the sludge storage capacity of the site, the transportation capacity of the cleaning vehicle, fuel consumption, time, etc., and improving the efficiency and economy of sludge cleaning.

[0049] The present application is based on big data analysis, constructs a wisdom operation management platform subsystem, and the development direction belongs to the organic integration of traditional industry and emerging industry, the required development technology is mature, the development framework is clear, and the realization is strong. In addition, the application of the present application can greatly reduce the water content of the transported sludge, reduce the volume of the treated sludge; on the other hand, the application of the present application matches the site transportation demand with the transportation capacity of the sludge cleaning and transportation vehicle, plans a scientific and reasonable collection route for the sludge cleaning and transportation vehicle, greatly reduces the investment of manpower and material resources, reduces the cost investment of sludge treatment, and has strong application prospect.

[0050] Embodiment 2

[0051] The present embodiment provides a decentralized domestic sewage treatment equipment residual sludge discharge and cleaning method based on the residual sludge discharge and cleaning system in embodiment 1, comprising the following steps:

[0052] Step one, the equipment absolute dry sludge yield prediction module receives a large amount of water inflow and water quality statistical data of the decentralized rural domestic sewage wisdom operation management platform within a period of time, and calculates the absolute dry sludge yield within the period of time according to the residual sludge yield coefficient of the equipment.

[0053] Step two, when the total cumulative value of the absolute dry sludge yield of each equipment reaches the set discharge value and its integer multiple, feedback to the system, the equipment sludge pre-concentration discharge remote control module of the system sends the equipment sludge pre-concentration discharge control instruction to the equipment terminal receiving module, so that the sludge backflow system is temporarily closed, the pre-concentration before sludge discharge is completed, and then the sludge discharge valve is opened to complete the discharge of the pre-concentration sludge.

[0054] Step three, the equipment sludge tank cleaning amount calculation module calculates the cumulative sludge amount of the equipment sludge tank within the cleaning period according to the predicted absolute dry sludge amount discharged by the equipment within the cleaning period. The sludge cleaning vehicle cleaning target planning module selects the relevant target station according to the above predicted value by the built-in operation algorithm of the module, and sends the target station to the sludge cleaning vehicle receiving end through the cloud service module.

[0055] Step four, after the sludge cleaning vehicle receiving end obtains the target station instruction, it goes to the target station to extract the sludge in the sludge tank without supernatant, simultaneously counts the volume value of the extracted sludge of each station, and feeds back the value to the system through the equipment data sending end to calibrate the Y coefficient (residual sludge yield coefficient of the equipment).

[0056] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for discharging and removing excess sludge from a decentralized domestic sewage treatment device, characterized by, The method comprises the following steps: establishing a connection with the decentralized domestic sewage treatment equipment, calculating an absolute dry sludge yield prediction value M in a period of time based on the water quality and quantity of the influent in the period of time and a pre-set equipment residual sludge yield coefficient, and sending a sludge pre-concentration discharge control instruction to the domestic sewage treatment equipment when a pre-set discharge condition is met to realize the discharge of residual sludge after pre-concentration treatment; based on the absolute dry sludge yield prediction value M, calculating the volume V of non-absolute dry sludge to be cleaned and transported in a cleaning and transporting cycle, determining a target domestic sewage treatment equipment to be cleaned and transported, and cleaning and transporting by using a cleaning and transporting vehicle, the process of realizing the discharge of residual sludge comprises the following steps: controlling the sludge reflux pump to be closed for A minutes to complete pre-concentration before sludge discharge, keeping the sludge discharge electric valve open for the last B minutes in the A-minute period, resuming the sludge reflux pump after B minutes, and closing the sludge discharge electric valve to realize the discharge of residual sludge, the target domestic sewage treatment equipment to be cleaned and transported is determined as follows: selecting a domestic sewage treatment equipment with a non-absolute dry sludge volume V greater than a pre-set value as a first target domestic sewage treatment equipment, taking the first target domestic sewage treatment equipment as a base coordinate, and selecting the nearest n sites in a fan-shaped radiation direction towards a sludge storage terminal to obtain finally selected target domestic sewage treatment equipment, the non-absolute dry sludge volume V to be cleaned and transported is calculated by using the following formula: V=△W*P / Z wherein V is the non-absolute dry sludge volume to be cleaned and transported, △W is the absolute dry sludge mass in a predicted cleaning and transporting cycle, P is a sludge pool re-compression coefficient, and Z is the concentration of sludge discharged by the equipment, after cleaning and transporting by using the cleaning and transporting vehicle, the following steps are further included: collecting the volume value of sludge actually extracted by the cleaning and transporting vehicle at each domestic sewage treatment equipment, and calibrating the equipment residual sludge yield coefficient, the equipment residual sludge yield coefficient is determined according to the specific process of the decentralized domestic sewage treatment equipment and the sludge age, in combination with the actual yield of absolute dry sludge, the sludge pre-concentration discharge control instruction comprises: closing the equipment sludge reflux pump for A minutes, keeping the sludge discharge electric valve open for the last B minutes in the A-minute period, resuming the equipment sludge reflux pump after B minutes, and closing the sludge discharge electric valve.

2. The method according to claim 1, wherein the method is characterized by, the pre-set discharge condition is that the total cumulative value W of the absolute dry sludge yield prediction reaches a pre-set discharge value X or an integer multiple of X.

3. The method of claim 1, wherein the method is characterized by: the absolute dry sludge yield prediction value M is calculated by using the following formula: M=C*Q*Y wherein M is the absolute dry sludge yield prediction value in the period of time, C is the average concentration of influent water quality COD in the period of time, Q is the total cumulative amount of influent water, and Y is the equipment residual sludge yield coefficient.

4. The method of claim 1, wherein the method is characterized by, the cleaning and transporting vehicle is used to clean and transport the sludge not containing supernatant in the sludge pool of the target domestic sewage treatment equipment.

5. A decentralized domestic sewage treatment equipment residual sludge discharge and cleaning system, characterized in that, A system for implementing the method for discharging and cleaning residual sludge of the decentralized domestic sewage treatment equipment according to any one of claims 1-4 comprises: a cloud service module configured to establish a connection with the decentralized domestic sewage treatment equipment and collect information about the water quality and quantity of influent water; an equipment absolute dry sludge yield prediction module configured to calculate an absolute dry sludge yield prediction value M based on the information about the water quality and quantity of influent water and a pre-set equipment residual sludge yield coefficient; and a cloud service module configured to establish a connection with the decentralized domestic sewage treatment equipment and collect information about the water quality and quantity of influent water. The device sludge pre-concentration discharge remote control module is used for calculating an absolute dry sludge yield prediction total cumulative value W based on the absolute dry sludge yield prediction value M, and sending a sludge pre-concentration discharge control instruction to a corresponding domestic sewage treatment device when the total cumulative value W reaches a preset discharge value X or an integer multiple of X, so as to realize the discharge of residual sludge after pre-concentration treatment. The device sludge pool cleaning and transporting capacity calculation module is used for generating a sludge cleaning and transporting vehicle task route and an instruction based on the absolute dry sludge yield prediction value M.

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