Active sludge on-line monitoring device for printing and dyeing wastewater treatment

Abstract

The utility model relates to the technical field of printing and dyeing wastewater treatment, and discloses an active sludge on-line monitoring device for printing and dyeing wastewater treatment, which comprises a machine shell, a centralized control screen is arranged on the machine shell, a monitoring unit for on-line monitoring of active sludge is arranged in the machine shell, and the monitoring unit is in signal connection with the centralized control screen. The monitoring unit comprises a sampling and pretreatment subunit for extracting and treating the sewage from the biochemical pool, a reaction and measurement subunit for carrying out biochemical reaction and measurement on the sewage, and a dosing subunit for adding a reagent. According to the active sludge online monitoring device for printing and dyeing wastewater treatment, the state of the active sludge can be evaluated more comprehensively, so that the operation condition of a sewage treatment system can be reflected more accurately. And abnormal conditions can be found in time, and the problem of monitoring lag caused by a fixed reference value of traditional monitoring equipment is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of printing and dyeing wastewater treatment, in particular to an activated sludge online monitoring device for printing and dyeing wastewater treatment. Background Art

[0002] In the field of printing and dyeing wastewater treatment, the activated sludge process is widely used due to its efficient organic matter degradation capabilities. However, printing and dyeing wastewater has a complex composition, high chemical oxygen demand (COD), and high suspended solids content. This leads to intense competition between heterotrophic bacteria and nitrifying bacteria in the activated sludge, which in turn causes fluctuations in effluent ammonia and nitrogen concentrations, affecting the final effluent quality. To monitor the activity status of the activated sludge in real time, adjust process parameters promptly, and ensure the stable operation of the wastewater treatment system, online activated sludge monitoring devices have emerged for printing and dyeing wastewater treatment.

[0003] Conventional activated sludge monitoring devices are mostly capable of detecting only a single parameter, such as the specific oxygen uptake rate (SOUR) or nitrification rate. This single-parameter monitoring approach presents significant limitations. Because the activated sludge system is a complex ecosystem, a single parameter cannot fully and accurately reflect the overall activity of the sludge, nor can it enable linked analysis of heterotrophic and nitrifying bacteria activity. When sludge activity is impacted or process conditions change, the monitoring results of a single parameter often lag, preventing timely warnings. This can lead to fluctuations in effluent quality and even system failure. This limitation severely restricts the effectiveness of traditional monitoring devices in the treatment of printing and dyeing wastewater, making it difficult to meet increasingly stringent effluent quality requirements. Utility Model Content

[0004] The purpose of this utility model is to provide an online activated sludge monitoring device for dyeing wastewater treatment, which can more comprehensively assess the status of activated sludge, thereby more accurately reflecting the operating status of the sewage treatment system. It can also promptly detect abnormal conditions, avoiding the monitoring lag caused by the fixed baseline value of traditional monitoring equipment.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an online monitoring device for activated sludge in the treatment of printing and dyeing wastewater, comprising a machine housing, a centralized control screen being provided on the machine housing, a monitoring unit for online monitoring of activated sludge being provided in the machine housing, the monitoring unit being signal-connected to the centralized control screen, the monitoring unit comprising a sampling and pretreatment subunit for extracting and treating sewage from a biochemical pool, a reaction and measurement subunit for performing biochemical reaction and measurement on the sewage, and a dosing subunit for adding reagents.

[0006] One side of the reaction and measurement subunit is connected to the sampling and pretreatment subunit, and the other side of the reaction and measurement subunit is connected to the dosing subunit.

[0007] Preferably, the sampling and pretreatment subunit includes a mounting base disposed in the machine housing, the mounting base being provided with a first liquid pump, a liquid collection tube being fixed to the liquid inlet of the first liquid pump, a large-pore filter being provided on the liquid collection tube, a first liquid outlet tube being provided at the liquid outlet of the first liquid pump, an electric two-way valve being provided on the first liquid outlet tube, and mounting tubes being fixed to both liquid outlet ends of the electric two-way valve. The mounting tubes are in communication with the reaction and measurement subunit.

[0008] Preferably, a through hole for the first liquid outlet pipe to pass through is opened on the machine housing, and the first liquid outlet pipe can be connected with the biochemical pool after passing through the through hole.

[0009] Preferably, the reaction and measurement subunit includes a first reaction vessel disposed within the machine housing, the first reaction vessel being connected to a mounting pipe at one end of the electric two-way valve and equipped with an agitator. An aerator is disposed within the machine housing, a first connecting pipe being secured to the output end of the aerator, and a double-layered annular aeration head disposed on the inner wall of the first reaction vessel and connected to the first connecting pipe. The first reaction vessel is also equipped with a dissolved oxygen meter and a sludge concentration meter.

[0010] Preferably, a nitric nitrogen testing device is provided in the machine housing, a second liquid pump is provided outside the nitric nitrogen testing device, the liquid outlet end of the second liquid pump is connected to the nitric nitrogen testing device, a second connecting pipe is fixed to the liquid inlet end of the second liquid pump, and the second connecting pipe is connected to the first reaction container.

[0011] Preferably, the second connecting pipe is provided with a safety filter for secondary filtration of the extracted solution.

[0012] Preferably, a second reaction container is provided in the machine housing, a capacitive level meter is provided in the second reaction container, and the installation pipe at the other end of the electric two-way valve is connected to the second reaction container.

[0013] Preferably, the dosing sub-unit includes a medicine storage tank arranged in the machine casing, a third liquid pump is provided at the top of the medicine storage tank, the liquid inlet end of the third liquid pump is connected to the medicine storage tank, the liquid outlet end of the third liquid pump is connected to a medicine outlet pipe, and the medicine outlet pipe is connected to the first reaction container.

[0014] Compared with the existing technology, the utility model provides an online monitoring device for activated sludge in the treatment of printing and dyeing wastewater, which has the following beneficial effects: the online monitoring device for activated sludge in the treatment of printing and dyeing wastewater, through the collaborative detection method of the sampling and pretreatment subunit, the reaction and measurement subunit and the dosing subunit, can more comprehensively evaluate the state of the activated sludge compared to the single parameter detection method of the traditional monitoring equipment, thereby more accurately reflecting the operating status of the sewage treatment system. It can also detect abnormal situations in a timely manner, avoiding the monitoring lag problem caused by the fixed baseline value of traditional monitoring equipment. And through the large-aperture filter and security filter, it can effectively remove suspended matter and impurities in the sewage, ensuring that the water quality of the reaction and measurement subunit is relatively clean. This helps to improve the accuracy and stability of monitoring and reduce monitoring errors caused by water quality problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a partial three-dimensional structure of an activated sludge online monitoring device for printing and dyeing wastewater treatment according to the present invention;

[0016] Figure 2 This is a schematic diagram of a top view and cross-section of the structure of an activated sludge online monitoring device for printing and dyeing wastewater treatment according to the present invention;

[0017] Figure 3 This is a schematic diagram of the three-dimensional structure of the activated sludge online monitoring device for printing and dyeing wastewater treatment of the utility model;

[0018] Figure 4 This is a schematic diagram of the internal structure of the first reaction vessel in the activated sludge online monitoring device for printing and dyeing wastewater treatment of the utility model;

[0019] Figure 5 This is a schematic diagram of the partial structure of the reaction and measurement subunit in the activated sludge online monitoring device for printing and dyeing wastewater treatment of the utility model;

[0020] Figure 6 This is a schematic structural diagram of the dosing subunit in the activated sludge online monitoring device for printing and dyeing wastewater treatment of the utility model.

[0021] In the figure: 1. Machine casing; 2. Centralized control panel; 3. Monitoring unit; 31. Sampling and pretreatment subunit; 311. Mounting base; 312. First liquid pump; 313. Liquid collection pipe; 314. Large-aperture filter; 315. First liquid outlet pipe; 316. Electric two-way valve; 317. Mounting pipe; 32. Reaction and measurement subunit; 321. First reaction vessel; 322. Agitator; 323. Aerator; 324. First connecting pipe; 325. Double-layer annular aeration head; 326. Dissolved oxygen meter; 327. Sludge concentration meter; 328. Nitrate nitrogen testing equipment; 329. Second liquid pump; 3210. Second connecting pipe; 3211. Safety filter; 3212. Second reaction vessel; 3213. Capacitive level meter; 33. Dosing subunit; 331. Drug storage tank; 332. Third liquid pump; 333. Drug outlet pipe. DETAILED DESCRIPTION

[0022] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is described in further detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] Centralized control panel 2 features a control system consisting of a data acquisition module and an early warning module. The data acquisition module records parameters such as dissolved oxygen (DO), sludge mass concentration (MLSS), and nitrate nitrogen concentration in real time and transmits them to the central control room computer via RS485 communication. Core module: Advantech ADAM-4017+ (8-channel analog input, supporting 4-20mA / 0-10V, Modbus RTU protocol); auxiliary modules: ADAM-4068 (relay output); ADAM-5056 (digital I / O module); and early warning module: comparing results against preset baseline values. Core module: Siemens SIMATIC S7-1200 PLC (6ES7214-1AG40-0XB0). Functional configuration: Built-in alarm commands (such as ALARM_8P) with threshold triggering and delay detection; PROFINET connection to an HMI (such as the TP700 Comfort screen) for pop-up notifications; and expansion module SM1223 (digital I / O) for controlling audible and visual alarms (such as the Omron E3K series).

[0024] Example: See Figures 1-6The present invention provides a technical solution: an online activated sludge monitoring device for dyeing and printing wastewater treatment, comprising a machine housing 1, a centralized control panel 2 mounted on the machine housing 1, and a monitoring unit 3 for online monitoring of the activated sludge disposed within the machine housing 1. The monitoring unit 3 is signal-connected to the centralized control panel 2 and includes a sampling and pretreatment subunit 31 for extracting and treating wastewater from a biochemical tank, a reaction and measurement subunit 32 for biochemical reactions and measurements of the wastewater, and a dosing subunit 33 for adding reagents. Through the centralized control panel 2, staff can conveniently view monitoring data and control the operating status of the monitoring unit 3, improving work efficiency and convenience.

[0025] One side of the reaction and measurement subunit 32 is connected to the sampling and pretreatment subunit 31, and the other side of the reaction and measurement subunit 32 is connected to the dosing subunit 33. This allows the sewage to flow smoothly between the various subunit areas, ensuring the continuity and stability of the monitoring process.

[0026] Furthermore, the sampling and pretreatment subunit 31 includes a mounting base 311 disposed in the machine housing 1. A first liquid pump 312 is disposed on the mounting base 311. A liquid collection pipe 313 is fixed to the liquid inlet of the first liquid pump 312. A large-pore filter 314 is provided on the liquid collection pipe 313. A first liquid outlet pipe 315 is provided at the liquid outlet of the first liquid pump 312. An electric two-way valve 316 is provided on the first liquid outlet pipe 315. Both liquid outlet ends of the electric two-way valve 316 are fixed with mounting pipes 317. The mounting pipe 317 is connected to the reaction and measurement subunit 32. The large-pore filter 314 can effectively remove large-particle suspended matter in the sewage, preventing these impurities from entering the subsequent system and causing blockage or damage, thereby improving the stability and reliability of the system.

[0027] Furthermore, the machine housing 1 is provided with a through-hole for a first liquid outlet pipe 315 to pass through. Once through the through-hole, the first liquid outlet pipe 315 can communicate with the biochemical pool. This allows the sampling and pretreatment subunit 31 to extract wastewater directly from the biochemical pool, ensuring representative and real-time sampling, and providing accurate data for subsequent monitoring.

[0028] Furthermore, the reaction and measurement subunit 32 includes a first reaction vessel 321 disposed within the machine housing 1. The first reaction vessel 321 is connected to a mounting pipe 317 at one end of the electric two-way valve 316 and is equipped with an agitator 322. An aerator 323 is also housed within the machine housing 1. A first connecting pipe 324 is secured to the output end of the aerator 323. A double-layered annular aeration head 325 is mounted on the inner wall of the first reaction vessel 321 and is connected to the first connecting pipe 324. A dissolved oxygen meter 326 and a sludge concentration meter 327 are also mounted within the first reaction vessel 321. These meters can monitor key parameters during the reaction in real time, providing strong support for subsequent data processing.

[0029] Furthermore, the machine housing 1 houses a nitrate-nitrogen testing device 328. A second pump 329 is mounted externally to the nitrate-nitrogen testing device 328. The liquid outlet of the second pump 329 is connected to the interior of the nitrate-nitrogen testing device 328. A second connecting pipe 3210 is secured to the liquid inlet of the second pump 329, which is in communication with the first reaction vessel 321. The nitrate-nitrogen testing device 328 accurately measures the nitrate-nitrogen concentration in wastewater, providing data support for calculating key parameters such as the specific nitrification rate. The second pump 329 ensures a stable supply of sample during the test.

[0030] Furthermore, a safety filter 3211 for secondary filtration of the extracted solution is provided on the second connecting pipe 3210. The safety filter 3211 can further remove tiny impurities in the sample, protecting the nitric nitrogen testing device 328 from contamination and damage, thereby extending the service life of the device.

[0031] Furthermore, a second reaction vessel 3212 is disposed within the machine housing 1. A capacitive level gauge 3213 is installed within this second reaction vessel 3212. A mounting tube 317 at the other end of the electric two-way valve 316 is connected to the second reaction vessel 3212. This second reaction vessel 3212 provides an independent space for measuring the sludge volume index, preventing interference with other reaction processes. The capacitive level gauge 3213 accurately measures the sludge layer height, providing reliable data for calculating the sludge volume index.

[0032] Furthermore, the dosing subunit 33 includes a drug storage tank 331 disposed within the machine housing 1. A third liquid pump 332 is disposed at the top of the drug storage tank 331. The liquid inlet of the third liquid pump 332 is connected to the drug storage tank 331, and the liquid outlet of the third liquid pump 332 is connected to a drug outlet pipe 333, which is in communication with the first reaction vessel 321. The dosing subunit 33 can add necessary reagents, such as ammonium chloride solution, to the reaction vessel as needed to maintain the smooth progress of the biochemical reaction. The third liquid pump 332 ensures accurate addition and a stable supply of reagents.

[0033] The online activated sludge monitoring device for dyeing wastewater treatment operates as follows: A monitoring unit 3 is integrated within the machine housing 1. This unit comprises a sampling and pretreatment subunit 31, a reaction and measurement subunit 32, and a dosing subunit 33. First, the sampling and pretreatment subunit 31 begins operation. The first pump 312 on the mounting base 311 draws wastewater from the biochemical pool via a liquid intake pipe 313. A large-pore filter 314 on the liquid intake pipe 313 removes suspended solids larger than 3 cm, ensuring relatively clean water entering the subsequent system. The first pump 312 then distributes the filtered wastewater through a first outlet pipe 315 and an electric two-way valve 316 to two mounting pipes 317, ultimately delivering it to the first reaction vessel 321 and second reaction vessel 3212 of the reaction and measurement subunit 32, respectively.

[0034] In the reaction and measurement subunit 32, the system will perform corresponding biochemical reactions and measurements according to different monitoring requirements. For monitoring of specific oxygen consumption rate (SOUR), the aerator 323 aerates the reaction vessel through the first connecting pipe 324 and the double-layer annular aeration head 325 to increase the dissolved oxygen to the set value DO 01 . 5 seconds after aeration is stopped, the dissolved oxygen meter 326 records the dissolved oxygen data DO1 in real time, and the sludge concentration meter 327 reads the sludge concentration (MLSS1) value. The agitator 322 is started to consume the dissolved oxygen, and the dissolved oxygen meter 326 continues to record data until the dissolved oxygen concentration drops below 2 mg / L. By fitting the curve of dissolved oxygen concentration changing with time (DO-t curve), the oxygen consumption rate constant k is calculated, and then the specific oxygen consumption rate is obtained according to the formula SOUR=k / MLSS1. This parameter is monitored once an hour, and its baseline value is taken from the sliding average of the past 7 days. When the SOUR value is lower than 30% of the baseline value, the multi-level warning of the centralized control screen 2 will be triggered.

[0035] Monitoring of the specific nitrification rate (SNUR) is also performed in the first reaction vessel 321. After the sample enters the reaction vessel, the third pump 332 of the dosing subunit 33 extracts ammonium chloride solution from the drug storage tank 331 and adds it to the reaction vessel through the drug outlet pipe 333. The agitator 322 operates for 30 seconds to mix the solution evenly. After standing for 5 minutes, the second pump 329 extracts the supernatant through the second connecting pipe 3210 and the security filter 3211 and sends it to the nitric nitrogen testing equipment 328 to detect the initial nitric nitrogen concentration N1. Subsequently, the aerator 323 is restarted to maintain the dissolved oxygen concentration constant at the set value DO 02The sludge concentration is monitored at ±0.2 mg / L. Simultaneously, a sludge concentration meter 327 measures the sludge concentration (MLSS2). Aeration is stopped after 2 hours, and after 5 minutes of sludge sludge concentration is again collected and tested for the nitrate nitrogen concentration (N2). The specific nitrification rate (SNUR) is calculated using the formula SNUR = (N2 - N1) / 2 / MLSS2. This parameter is monitored daily, with the baseline value being the sliding average of the past 30 days. When the SNUR value falls below 15% of the baseline, a multi-level warning is triggered on centralized control panel 2.

[0036] The sludge volume index (SVI) is monitored in the second reaction vessel 3212. After the sample enters the reaction vessel, it is allowed to rest for two hours. The capacitive level meter 3213 reads the sludge layer height (H mL) to obtain the sludge volume (SV). Combined with the sludge concentration (MLSS1) measured during the specific oxygen consumption rate monitoring, the sludge volume index is calculated using the formula SVI = SV × 10 / MLSS1. This parameter is monitored daily, with a normal range of 50 to 150. Exceeding this range triggers an alert.

[0037] During the entire monitoring process, the control system in the centralized control screen 2 collects, transmits and processes data in real time, and makes judgments based on preset benchmark values ​​and algorithms. It triggers the early warning module when necessary and can display alarm information through the centralized control screen 2 to ensure the stable operation of the monitoring unit 3.

[0038] The above embodiments merely represent one or several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. An activated sludge online monitoring device for dyeing wastewater treatment, comprising a machine housing (1), a centralized control panel (2) being provided on the machine housing (1), and characterized in that: A monitoring unit (3) for online monitoring of activated sludge is provided in the machine housing (1). The monitoring unit (3) is connected to the centralized control panel (2) by signal. The monitoring unit (3) comprises a sampling and pretreatment subunit (31) for extracting and treating sewage from the biochemical pool, a reaction and measurement subunit (32) for performing biochemical reaction and measurement on the sewage, and a dosing subunit (33) for adding reagents. One side of the reaction and measurement subunit (32) is connected to the sampling and pretreatment subunit (31), and the other side of the reaction and measurement subunit (32) is connected to the dosing subunit (33).

2. The activated sludge online monitoring device for printing and dyeing wastewater treatment according to claim 1 is characterized in that: The sampling and pretreatment subunit (31) includes a mounting base (311) arranged in the machine housing (1), a first liquid pump (312) is arranged on the mounting base (311), a liquid collection pipe (313) is fixed to the liquid inlet end of the first liquid pump (312), a large-pore filter (314) is arranged on the liquid collection pipe (313), a first liquid outlet pipe (315) is arranged at the liquid outlet end of the first liquid pump (312), an electric two-way valve (316) is arranged on the first liquid outlet pipe (315), and both liquid outlet ends of the electric two-way valve (316) are fixed with mounting pipes (317); the mounting pipes (317) are connected to the reaction and measurement subunit (32).

3. The activated sludge online monitoring device for printing and dyeing wastewater treatment according to claim 2 is characterized in that: The machine housing (1) is provided with a through hole for the first liquid outlet pipe (315) to pass through.

4. The activated sludge online monitoring device for printing and dyeing wastewater treatment according to claim 2 is characterized in that: The reaction and measurement subunit (32) comprises a first reaction container (321) arranged in a machine housing (1), the first reaction container (321) being in communication with a mounting pipe (317) at one end of an electric two-way valve (316), and a stirrer (322) being arranged in the first reaction container (321); an aerator (323) being arranged in the machine housing (1), a first connecting pipe (324) being fixed to an output end of the aerator (323), and a double-layered annular aeration head (325) being in communication with the first connecting pipe (324) being arranged on an inner wall of the first reaction container (321); and a dissolved oxygen meter (326) and a sludge concentration meter (327) being arranged on the first reaction container (321).

5. The activated sludge online monitoring device for printing and dyeing wastewater treatment according to claim 4 is characterized in that: A nitric nitrogen testing device (328) is provided in the machine housing (1), a second liquid pump (329) is provided outside the nitric nitrogen testing device (328), a liquid outlet of the second liquid pump (329) is connected to the inside of the nitric nitrogen testing device (328), a second connecting pipe (3210) is fixed to the liquid inlet of the second liquid pump (329), and the second connecting pipe (3210) is connected to the first reaction container (321).

6. The activated sludge online monitoring device for printing and dyeing wastewater treatment according to claim 5 is characterized in that: The second connecting pipe (3210) is provided with a safety filter (3211) for secondary filtration of the extracted solution.

7. The activated sludge online monitoring device for printing and dyeing wastewater treatment according to claim 2 is characterized in that: A second reaction container (3212) is provided in the machine housing (1), a capacitive level meter (3213) is provided in the second reaction container (3212), and a mounting pipe (317) at the other end of the electric two-way valve (316) is in communication with the second reaction container (3212).

8. The activated sludge online monitoring device for printing and dyeing wastewater treatment according to claim 4 is characterized in that: The dosing subunit (33) comprises a medicine storage tank (331) arranged in the machine housing (1); a third liquid pump (332) is provided at the top of the medicine storage tank (331); a liquid inlet end of the third liquid pump (332) is connected to the medicine storage tank (331); a liquid outlet end of the third liquid pump (332) is connected to a medicine outlet pipe (333); and the medicine outlet pipe (333) is connected to the first reaction container (321).

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