Water quality early warning device and sewage treatment system

Abstract

The utility model discloses a water quality early warning device and sewage treatment system, this water quality early warning device includes configuration buffer tank, aeration early warning jar, early warning sediment jar and electric control device, and the bottom of aeration early warning jar is provided with aeration pipe and aeration fan, and the upper portion of aeration early warning jar still is linked together with early warning sediment jar through the communicating pipe, and early warning sediment jar is provided with sludge supply pipe, early warning sludge return pipe and early warning sludge discharge pipe connected with aeration early warning jar, and the top of early warning sediment jar is provided with overflow pipe, and aeration early warning jar is provided with dissolved oxygen instrument probe and nitrate instrument, and electric control device is electrically connected with aeration fan, return pump, water pump, dissolved oxygen instrument probe and nitrate instrument. The sewage treatment system uses above -mentioned water quality early warning device, can carry out on -line water quality monitoring in the process of sewage treatment, and the condition of inlet water is analyzed and judged, and the subsequent process adjustment of sewage treatment system is convenient.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a water quality early warning device and a wastewater treatment system. Background Technology

[0002] Currently, in wastewater treatment systems, due to the different sources of wastewater, some substances harmful to organisms may be present. Various detection methods exist in current wastewater treatment systems. These instruments utilize the sensitivity of organisms to toxic substances, indirectly reflecting the presence and concentration of toxic substances in wastewater by monitoring changes in physiological and metabolic indicators of organisms. The core component is the "biosensor," and commonly used organisms include bacteria, algae, water fleas, and fish. Among these, bacteria and algae are the most widely used due to their ease of cultivation and rapid response.

[0003] 1. Bacterial toxicity analyzer: This analyzer uses the correlation between bacterial respiration (or metabolic activity) and the "inhibitory effect" of toxic substances. Under normal circumstances, bacteria consume oxygen and produce ATP through respiration, or generate specific products (such as fluorescent substances) through enzymatic reactions. When toxic substances are present in wastewater, bacterial respiration / metabolism is inhibited, and related indicators (such as oxygen consumption and fluorescence intensity) will undergo quantifiable changes. By detecting these changes, the strength of toxicity can be inferred.

[0004] 2. Algal Toxicity Analyzer: Based on the sensitivity of algae's photosynthesis to toxic substances. Algae absorb carbon dioxide, release oxygen, or synthesize chlorophyll (chlorophyll a content is positively correlated with algal activity) through photosynthesis. When toxic substances (such as heavy metals and herbicides) are present in wastewater, photosynthesis is inhibited, and related indicators (such as oxygen release, chlorophyll a content, and fluorescence parameters) will decrease. The changes in these indicators reflect the toxicity.

[0005] 3. Zooplankton toxicology meter: This device uses water fleas (such as Daphnia macrocarpa) as the detection organism, utilizing their movement behavior (such as swimming speed and trajectory) or survival status in response to toxicity. Normal water fleas are active and have stable trajectories; when exposed to toxic wastewater, they will slow down, become unbalanced, or even die. Image recognition technology (such as camera + algorithm) is used to monitor their behavioral changes in real time and quantify the toxic impact.

[0006] 4. Fish Toxicity Monitor: This device uses small fish (such as zebrafish and killifish) as biological indicators to monitor changes in their physiological state (such as heart rate, respiratory rate, and gill cover movement) or behavior (such as abnormal swimming). Toxic substances can affect the nervous and respiratory systems of fish, leading to slowed heart rate, rapid breathing, or erratic swimming. These changes are captured by sensors (such as infrared sensors monitoring gill cover movement) or imaging technology.

[0007] Current toxicology meters are expensive and not linked to water plant process control. They only provide toxicity detection and cannot effectively assess other impacts on water quality, thus failing to provide guidance for subsequent process control. Utility Model Content

[0008] The first technical problem to be solved by this utility model is to provide a water quality early warning device. This device uses high-concentration activated sludge in the sewage treatment system to provide online water quality early warning for incoming water, and judges the state of incoming water by detecting the content of dissolved oxygen and nitrate nitrogen in the sewage, so as to serve as a basis for subsequent process control of the sewage treatment system.

[0009] The second technical problem to be solved by this utility model is to provide a sewage treatment system that uses the above-mentioned water quality early warning device, which can perform online water quality monitoring during the sewage treatment process, analyze and judge the influent situation, and facilitate subsequent process adjustments of the sewage treatment system.

[0010] To solve the first technical problem mentioned above, the technical solution of this utility model is: a water quality early warning device, comprising a buffer tank, an aeration early warning tank, an early warning sedimentation tank, and an electrical control device. The bottom of the aeration early warning tank is equipped with an aeration pipe with a flow meter and an aeration blower connected to the aeration pipe. An inlet pipe is provided on the aeration early warning tank, and an inlet pump is installed on the inlet pipe. The inlet of the inlet pipe is inserted into the buffer tank. A sampling inlet pipe is also provided on the buffer tank. The upper part of the aeration early warning tank is connected to the early warning sedimentation tank via a connecting pipe. The early warning sedimentation tank is equipped with a secondary sedimentation tank connected to the wastewater treatment system. The system includes a sludge supply pipe connected to the tank, a warning sludge pump installed on the sludge supply pipe, a warning sludge return pipe connected to the aeration warning tank at the bottom of the warning sedimentation tank, a warning return pump installed on the warning sludge return pipe, a warning sludge discharge pipe installed on the warning sedimentation tank, an overflow pipe installed at the top of the warning sedimentation tank, and a dissolved oxygen meter probe and a nitrile nitrogen meter installed on the aeration warning tank for detecting the dissolved oxygen concentration and nitrile nitrogen concentration in the wastewater. The warning device also includes an electrical control device, which is electrically connected to the aeration blower, return pump, inlet pump, dissolved oxygen meter probe, and nitrile nitrogen meter.

[0011] Preferably, the flow meter is a differential pressure flow meter, and the flow meter is electrically connected to the electronic control device.

[0012] Preferably, the configuration buffer container includes a container body, and the upper end of the container body is provided with a configuration addition port for adding ammonium chloride or sodium acetate.

[0013] Preferably, the warning sedimentation tank is further equipped with a sludge position detection sensor for detecting the sludge position in the tank, or the warning sludge discharge pipe is located above the sludge supply pipe, and the discharge flow rate of the warning sludge discharge pipe is greater than the supply flow rate of the sludge supply pipe. The sludge position detection sensor can detect the sludge position in the warning sedimentation tank, preventing excessive or insufficient sludge. Alternatively, if the warning sludge discharge pipe is positioned higher than the sludge supply pipe, and the discharge flow rate is greater than the supply flow rate, the sludge will gradually settle at the bottom of the warning sedimentation tank due to its lower supply position and tendency to sink. This sludge will then be supplied to the aeration warning tank. Because the discharge flow rate of the warning sludge discharge pipe is greater than the supply flow rate, it will continuously discharge sludge above the pipe's height. If the sludge is below the pipe's height, the pipe will primarily discharge wastewater from the warning sedimentation tank, which already needs to be discharged and therefore does not affect the overall system. These methods ensure that the amount of sludge is not excessive.

[0014] After adopting the above technical solution, the effect of this utility model is as follows: The sampling inlet pipe of the water quality early warning device is directly connected to the main inlet of the sewage treatment system, so that the system water can be detected and warned in a timely manner. At the same time, it utilizes the concentrated sludge in the sludge thickening tank. The sludge concentration in the sludge thickening tank is much higher than the sludge concentration in the biological treatment tank module of the sewage treatment system. Generally, the sludge concentration in the biological treatment tank module is 3g / L, while the sludge concentration in the sludge thickening tank is generally 20g / L. Thus, the sludge concentration in the entire water quality early warning device is high, and the bacterial concentration is also higher than the bacterial concentration in the normal sewage treatment process. This allows the early warning device to react quickly, thereby obtaining the water quality status of the incoming water more quickly. Furthermore, since the bacterial species of the early warning device come from the sludge in the sewage treatment system, it can provide a better basis for subsequent adjustments. The sewage and sludge treated by the early warning device can then be discharged into the sewage treatment system for further treatment.

[0015] Therefore, this water quality early warning device has a simple structure and low cost. It utilizes microorganisms in the sludge of the sewage treatment system for early warning, making it more compatible with the sewage treatment system and providing better reference for subsequent treatment processes.

[0016] To solve the second technical problem mentioned above, the technical solution of this utility model is: a sewage treatment system, including an inlet pumping station, with a coarse filtration device installed upstream of the inlet pumping station according to the sewage flow direction; a fine filtration device and an aerated grit chamber connected downstream of the inlet pumping station, the fine filtration device also being connected to an emergency tank; a biological treatment tank module installed downstream of the aerated grit chamber, a secondary sedimentation tank connected downstream of the biological treatment tank module, a carbon mixing tank and a coagulation sedimentation tank connected downstream of the secondary sedimentation tank, a sand filter connected downstream of the coagulation sedimentation tank, and a chlorination contact tank connected downstream of the sand filter; the sewage treatment system also includes the aforementioned water quality early warning device. The sampling inlet pipe is connected to the inlet pipe of the inlet pump room, and the sludge discharge pipe is connected to the outlet pipe of the inlet pump room; the emergency pool is connected to the early warning buffer tank through a pipeline; the sewage treatment system also includes a sludge treatment module, which includes a sludge mixing well, a sludge thickening tank connected downstream of the sludge mixing well, a sludge storage tank connected downstream of the sludge thickening tank, a dewatering room located downstream of the sludge storage tank, and the secondary sedimentation tank and the coagulation sedimentation tank are both connected to the sludge mixing well through sludge discharge pipes. The sludge discharge pipe of the secondary sedimentation tank is also connected to a sludge external return pipe connected upstream of the biochemical treatment tank module, and the early warning sludge return pipe is connected to the secondary sedimentation tank.

[0017] Preferably, the biochemical treatment tank module includes a pre-anoxic tank, an anaerobic tank, a first anoxic tank, a first aerobic tank, a second anoxic tank, and a second aerobic tank connected in accordance with water flow. A mixed liquor return pipeline is provided between the first aerobic tank and the first anoxic tank. The sludge external return pipeline is connected to the sludge discharge pipeline and the pre-anoxic tank. The first aerobic tank and the second aerobic tank are connected to the air supply system of the blower room. Since a pre-anoxic tank is also provided, the sludge returned in the sludge external return pipeline contains nitrates, so the nitrates can be further consumed in the pre-anoxic tank.

[0018] After adopting the above technical solution, the effect of this utility model is as follows: In this sewage treatment system, the influent enters the influent pumping station through coarse filtration. A portion is sampled and sent to the water quality early warning device for early warning response, while the vast majority of sewage enters the subsequent process for treatment normally. After biochemical treatment in the biological treatment tank module, it enters the secondary sedimentation tank for sedimentation. Activated carbon can be added to the carbon mixing tank as needed to absorb organic pollutants. PAC and PAM can be added to the coagulation sedimentation tank for coagulation and sedimentation. Finally, part of the settled sludge is returned to the upstream of the biological treatment tank module, while the other part of the sludge enters the sludge treatment module for treatment. The sludge in the secondary sedimentation tank is returned to the water quality early warning device for early warning. This sewage treatment system monitors the condition of the incoming water through the water quality early warning device, thereby better controlling the process parameters of the biological treatment tank module.

[0019] In addition, this utility model also discloses a sewage treatment method, which uses the above-mentioned sewage treatment system and includes the following method: S1, external sewage is uniformly filtered through a coarse filtration device and then enters the inlet pumping station. A water quality early warning device samples a portion of the sewage from the inlet water of the inlet pumping station and enters the water quality early warning device for early warning analysis; while the other sewage flows into the sewage treatment system for normal sewage treatment.

[0020] S2. Wastewater in the aeration warning tank flows into the warning sedimentation tank and settles along with the high-concentration sludge returned from the secondary sedimentation tank. The settled sludge is then returned to the aeration warning tank. Microorganisms in the sludge decompose COD and ammonia nitrogen in the wastewater, consuming dissolved oxygen. The dissolved oxygen and nitrate nitrogen concentrations in the warning aeration tank are detected by a dissolved oxygen meter probe and a nitrate nitrogen meter, and continuous aeration occurs in the aeration warning tank. During normal influent, the dissolved oxygen concentration in the wastewater detected by the dissolved oxygen meter probe is controlled to be 2 mg / L by adjusting the air and water flow rates, and this is used as the baseline concentration and baseline aeration rate. When the dissolved oxygen concentration in the wastewater detected by the dissolved oxygen meter probe suddenly increases, the aeration rate of the aeration blower is reduced to the minimum aeration rate and maintained for a set time. If the dissolved oxygen concentration remains high, it is determined that the wastewater entering at this time has been subjected to toxic shock.

[0021] When the dissolved oxygen concentration in the wastewater detected by the dissolved oxygen meter probe decreases, the aeration rate of the aeration blower is adjusted to gradually restore the dissolved oxygen concentration to the baseline concentration. Then, the ammonia nitrogen concentration in the system is calculated based on the value from the nitrification meter. Then, the formula is used...

[0022] Q 气 =a×Q cod +b×Q 氨氮 +c

[0023] The concentration of COD was calculated; where Q 气 Q is the aeration flow rate at which the dissolved oxygen concentration in wastewater stabilizes at the baseline concentration. cod Q represents the concentration of COD. 氨氮 Here, a represents the concentration of ammonia nitrogen, b represents the calibrated COD concentration coefficient, and c represents other gas consumption. Then, based on the calculated ammonia nitrogen and COD concentrations, an alarm is triggered.

[0024] S3. If the water quality early warning device determines that the incoming water is a toxic shock, the emergency pool will be opened to allow the current sewage to flow into the emergency pool for temporary storage; if it is not a toxic shock, the theoretical aeration rate of the current sewage will be calculated according to the formula below:

[0025] Q 理气 =a×Q cod +b×Q 氨氮 +cf×Q 硝氮

[0026] Where f is the nitrate concentration coefficient, and its value is equal to the amount of air equivalent to a unit amount of nitrate; Q 硝氮 The concentration of purified nitrate nitrogen in wastewater;

[0027] S4. During normal operation of the wastewater treatment system, Q 实气 =h×Q 理气 ×Q 进水 Where h is the correction coefficient, Q 进水 Q represents the influent flow rate of the biochemical treatment tank module in the wastewater treatment system. 实气 This refers to the actual aeration flow rate of the biological treatment tank module in the wastewater treatment system; while under normal wastewater conditions without pollution source impact, the flow rate is adjusted by Q. 实气 and Q 进水 Then, the dissolved oxygen concentration in the biological treatment tank module is brought to the baseline concentration. At this point, the correction coefficient h is calculated. When the wastewater is subjected to pollutant impact, the Q calculated in step S3 is adjusted. 理气 Q 进水 Substituting the already calculated correction coefficient h into formula Q 实气 =h×Q 理气 ×Q 进水 And thus Q is obtained. 实气 This will guide the aeration adjustment of wastewater treatment systems in response to pollutant shocks.

[0028] Preferably, the water quality early warning device further includes a data calibration method, which includes the following steps:

[0029] A1. Add pure water and sodium acetate to the buffer tank, adjusting the amount of sodium acetate added. Prepare multiple sets of wastewater with different COD concentrations in the buffer tank, and record the recovery time of dissolved oxygen to 2 mg / L and the aeration rate Q when it stabilizes at 2 mg / L. 气1 According to formula Q 气1 =a×Q cod +b×Q 氨氮 +c calculates and calibrates a;

[0030] A2. Add pure water and ammonium chloride to the buffer tank, adjusting the amount of ammonium chloride added. Prepare multiple sets of wastewater with different ammonia nitrogen concentrations in the buffer tank, and record the recovery time of dissolved oxygen to 2 mg / L and the aeration rate Q when it stabilizes at 2 mg / L. 气2 According to formula Q 气2 =a×Q cod +b×Q 氨氮 +c calculates and calibrates b;

[0031] A3. Based on step A2, the correspondence between nitrate nitrogen and ammonia nitrogen concentrations is calibrated; where Q 氨氮 =d×Q 硝氮+e, where d is the concentration coefficient and e is the concentration of nitrate nitrogen in the sludge returned from the secondary sedimentation tank; d is calibrated using the above formula.

[0032] Preferably, when the incoming water is subject to toxic shock, activated carbon is added to the emergency tank for sedimentation. The sediment is then sent to the dewatering room for dewatering along with other sludge. After the incoming water stabilizes, the aeration rate of the aeration blower is adjusted to maintain the dissolved oxygen in the aeration warning tank at 2 mg / L. A small amount of wastewater from the emergency tank is then sent to a buffer tank for dilution. The dissolved oxygen concentration is monitored by a dissolved oxygen meter probe to ensure that it is below 4 mg / L. After verification, the wastewater gradually flows back from the emergency tank to the influent pumping station and enters the normal wastewater treatment process.

[0033] After adopting the above technical solution, the effect of this utility model is as follows: This sewage treatment method uses the dissolved oxygen meter probe and nitrate meter in the water quality early warning device to monitor the dissolved oxygen and nitrate nitrogen in sewage in real time, and adjusts the aeration rate of the aeration blower to stabilize the dissolved oxygen concentration in the sewage in the early warning device. Then, it judges the impact of pollutants on the incoming water of the system, and then guides the adjustment of the aeration rate in the subsequent biological treatment tank module based on the pollutant content in the early warning device. The process parameters of the overall sewage treatment are adjusted more quickly. Attached Figure Description

[0034] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0035] Figure 1 This is a structural cross-sectional view of the water quality early warning device according to Embodiment 1 of this utility model;

[0036] Figure 2 This is a partial structural schematic diagram of the sewage treatment system in Embodiment 2 of this utility model;

[0037] Figure 3 This is a partial structural diagram of the remaining part of the sewage treatment system in Embodiment 2 of this utility model;

[0038] Figure 4 This is a graph showing the relationship between COD concentration and aeration rate when calibration a is performed in Embodiment 3 of this utility model.

[0039] Figure 5 This is a graph showing the relationship between ammonia nitrogen and aeration rate during calibration b in Embodiment 3 of this utility model.

[0040] Figure 6 This is a conversion diagram of ammonia nitrogen and nitrate nitrogen in Embodiment 3 of this utility model;

[0041] In the attached diagram: 1. Buffer tank; 2. Aeration blower; 3. Flow meter; 4. Aeration early warning tank; 5. Dissolved oxygen meter probe; 6. Nitrogen meter; 7. Connecting pipe; 8. Early warning return pump; 9. Early warning sedimentation tank; 10. Early warning sludge pump; 11. Early warning sludge discharge pipe; 12. Overflow pipe; 13. Inlet pump; 14. Electrical control device; 15. Sludge position detection sensor. Detailed Implementation

[0042] The present invention will be further described in detail below through specific embodiments.

[0043] Example 1

[0044] like Figure 1 As shown, a water quality early warning device includes a buffer tank 1, an aeration early warning tank 4, an early warning sedimentation tank 9, and an electrical control device 14. The bottom of the aeration early warning tank 4 is equipped with an aeration pipe with a flow meter 3 and an aeration fan 2 connected to the aeration pipe. The flow meter 3 is a differential pressure flow meter 3, and the flow meter 3 is electrically connected to the electrical control device 14. The aeration fan 2 can be a commonly used aeration fan 2 from the biological treatment tank module of a sewage treatment plant, and the aeration flow rate can be adjusted by the output power of the aeration fan 2.

[0045] The aeration warning tank 4 is equipped with an inlet pipe, and an inlet pump 13 is installed on the inlet pipe. The inlet of the inlet pump 13 is inserted into the buffer tank 1, which is also equipped with a sampling inlet pipe. The sampling inlet pipe directly samples the influent from the wastewater treatment plant. The sampling inlet pipe samples the wastewater into the buffer tank 1 for buffering, and also facilitates its supply to the aeration warning tank 4. Sodium acetate or ammonium chloride can be added to the buffer tank 1 during calibration.

[0046] The upper part of the aeration warning tank 4 is also connected to the warning sedimentation tank 9 through the connecting pipe 7. The sewage and sludge are fully mixed and stirred in the aeration warning tank 4 under the aeration state, so that the bacteria in the sludge will treat the COD and ammonia nitrogen in the sewage.

[0047] The early warning sedimentation tank 9 is equipped with a sludge supply pipe connected to the secondary sedimentation tank in the sewage treatment system. The sludge concentration in the sludge thickening tank is much higher than the sludge concentration in the biochemical treatment tank module of the sewage treatment plant. Therefore, the bacterial treatment time of this early warning device is shorter than that of the normal sewage treatment process. This shortens the early warning time and allows for faster detection of the water quality.

[0048] The sludge supply pipe is equipped with an early warning sludge pump 10. The bottom of the early warning sedimentation tank 9 is equipped with an early warning sludge return pipe connected to the aeration early warning tank 4. The early warning sludge return pipe is equipped with an early warning return pump 8. The bottom of the early warning sedimentation tank 9 is also equipped with an early warning sludge discharge pipe 11. The top of the early warning sedimentation tank 9 is equipped with an overflow pipe 12. The aeration early warning tank 4 is equipped with a dissolved oxygen meter probe 5 and a nitrate meter 6 for detecting the dissolved oxygen concentration and nitrate nitrogen concentration of the sewage in the aeration early warning tank 4. The early warning device also includes an electrical control device 14, which is electrically connected to the aeration blower 2, the return pump, the inlet pump 13, the dissolved oxygen meter probe 5, and the nitrate meter 6. The electrical control device 14 can be set up as a separate control board or directly integrated into the control device of the sewage treatment system. Since the sewage treatment system of a normal sewage treatment plant has a main control device to control the water flow, aeration and chemical dosage, it is only necessary to integrate the control part of the water quality early warning device into the main control device. Since the control object of this control device and the main control device is the same, that is, to control the influent flow, sludge flow and aeration by controlling the power of the water pump, sludge pump and aeration blower 2, its control principle and control method are existing technologies.

[0049] Preferably, the configuration buffer tank 1 includes a tank body, the upper end of which is provided with a configuration addition port for adding ammonium chloride or sodium acetate. The warning sedimentation tank 9 is also equipped with a sludge position detection sensor 15 for detecting the sludge position in the warning sedimentation tank 9. The sludge position detection sensor 15 can detect the position of the sludge in the warning sedimentation tank 9, preventing situations where there is too much or too little sludge. The sludge position detection sensor 15 is commercially available, for example, a sludge interface meter using ultrasonic detection principles.

[0050] Example 2

[0051] like Figures 1 to 3 As shown, a wastewater treatment system includes an influent pump chamber 13. A coarse filter is installed upstream of the influent pump chamber 13 according to the wastewater flow direction. A fine filter and an aerated sedimentation tank are connected downstream of the influent pump chamber 13. The fine filter is also connected to an emergency tank. The emergency tank is used to buffer wastewater subjected to toxic shocks.

[0052] Downstream of the aerated sedimentation tank is a biochemical treatment tank module, downstream of which is a secondary sedimentation tank. Downstream of the secondary sedimentation tank are a carbon mixing tank and a coagulation sedimentation tank. Downstream of the coagulation sedimentation tank is a sand filter, and downstream of the sand filter is a chlorination contact tank. The wastewater treatment system also includes the aforementioned water quality early warning device. The sampling inlet pipe is connected to the inlet pipe of the inlet pump room 13, and the sludge discharge pipe is connected to the outlet pipe of the inlet pump room 13. The emergency pool is connected to the early warning buffer tank via a pipeline. The wastewater treatment system also includes a sludge treatment module, which includes a sludge mixing well. Downstream of the sludge mixing well is a sludge thickening tank, and downstream of the sludge thickening tank is a sludge storage tank. Downstream of the sludge storage tank is a dewatering room. The secondary sedimentation tank and the coagulation sedimentation tank are both connected to the sludge mixing well via sludge discharge pipes. The sludge discharge pipe of the secondary sedimentation tank is also connected to an external sludge return pipe, which is connected upstream of the biochemical treatment tank module. The early warning sludge return pipe is connected to the secondary sedimentation tank.

[0053] Preferably, the biochemical treatment tank module includes a pre-anoxic tank, an anaerobic tank, a first anoxic tank, a first aerobic tank, a second anoxic tank, and a second aerobic tank connected by water flow. A mixed liquor return pipeline is provided between the first aerobic tank and the first anoxic tank. The mixed liquor return pipeline is also called the internal return pipeline. Its function is to carry a portion of sludge while returning water. The sludge concentration in the mixed liquor return pipeline is about 3 g / L, the sludge concentration in the external return pipeline is about 6 g / L, and the sludge concentration in the sludge thickening tank is about 20 g / L.

[0054] The sludge external return pipeline connects to the sludge discharge pipeline and the pre-anoxic tank; the first aerobic tank and the second aerobic tank are connected to the air supply system of the blower room. Since a pre-anoxic tank is also set up, the sludge returned in the sludge external return pipeline contains nitrates, so the nitrates can be further consumed in the pre-anoxic tank.

[0055] Example 3

[0056] This embodiment discloses a wastewater treatment method that uses the wastewater treatment system in Embodiment 2, including the following steps: S1, external wastewater is coarsely filtered through a coarse filtration device and then enters the inlet pumping station. A water quality early warning device samples a portion of the wastewater from the inlet water of the inlet pumping station and enters the water quality early warning device for early warning analysis; while the remaining wastewater flows into the wastewater treatment system for normal wastewater treatment.

[0057] S2. Wastewater in the aeration warning tank will flow into the warning sedimentation tank and settle together with the high-concentration sludge returned from the secondary sedimentation tank. The settled sludge will then be returned to the aeration warning tank. Since the sludge concentration returned from the sludge thickening tank is 20 g / L, the sludge concentration is already very high. However, the sludge sedimentation rate is relatively constant. Therefore, when the sludge concentration is high, the sludge concentration after sedimentation in the warning sedimentation tank 9 will also be relatively stable, avoiding large fluctuations in sludge concentration. In this way, the sludge concentration returned to the aeration warning tank 4 is relatively stable.

[0058] Microorganisms in the sludge decompose COD and ammonia nitrogen in wastewater, consuming dissolved oxygen; dissolved oxygen and nitrate nitrogen concentrations in the aeration tank are detected and monitored using a dissolved oxygen meter probe and a nitrate nitrogen meter.

[0059] Dissolved oxygen meter and nitrate meter are both commonly used measuring instruments in the current wastewater treatment field.

[0060] The Nitrogen Meter 6 is an online analytical device used to monitor the concentration of nitrate nitrogen (NO-3N-) in water in real time. It is mainly used to monitor the nitrate nitrogen concentration in real time at key process points such as aeration tanks and denitrification tanks in sewage treatment systems, and to optimize aeration and accurately add carbon sources.

[0061] Dissolved oxygen meters are mainly based on two counting principles: electrochemical methods (including polarography and galvanic cell methods) and optical methods (fluorescence methods). They primarily monitor the dissolved oxygen content in aeration tanks.

[0062] The aeration warning tank continuously aerates the wastewater. During normal water intake, the dissolved oxygen concentration detected by the dissolved oxygen meter probe is controlled to be 2 mg / L by adjusting the air intake and water intake, and this is used as the baseline concentration and baseline aeration rate. When the dissolved oxygen concentration detected by the dissolved oxygen meter probe suddenly increases, the aeration rate of the aeration blower is reduced to the minimum aeration rate and maintained for a set time. If the dissolved oxygen concentration remains high, it is determined that the wastewater entering at this time has been subjected to toxic shock.

[0063] When the dissolved oxygen concentration in the wastewater detected by the dissolved oxygen meter probe decreases, the aeration rate of the aeration blower is adjusted to gradually restore the dissolved oxygen concentration to the baseline concentration. Then, the ammonia nitrogen concentration in the system is calculated based on the value from the nitrification meter. Then, the formula is used...

[0064] Q 气 =a×Q cod +b×Q 氨氮 +c

[0065] The concentration of COD was calculated; where Q 气 Q is the aeration flow rate at which the dissolved oxygen concentration in wastewater stabilizes at the baseline concentration. cod Q represents the concentration of COD. 氨氮Here, a represents the concentration of ammonia nitrogen, b represents the calibrated COD concentration coefficient, and c represents other gas consumption. Then, based on the calculated ammonia nitrogen and COD concentrations, an alarm is triggered.

[0066] S3. If the water quality early warning device determines that the incoming water is a toxic shock, the emergency pool will be opened to allow the current sewage to flow into the emergency pool for temporary storage; if it is not a toxic shock, the theoretical aeration rate of the current sewage will be calculated according to the formula below:

[0067] Q 理气 =a×Q cod +b×Q 氨氮 +cf×Q 硝氮

[0068] Where f is the nitrate concentration coefficient, which is equal to the amount of air equivalent to a unit quantity of nitrate; and based on the calculation that 1 mg NO3-N is equivalent to 10 mL of standard cubic air, the influent flow rate in this warning device is 0.15 L / h, and the nitrate concentration in the influent is Q. 硝氮 Therefore, through calculation, we know that: f = 0.15 × 10 × Q 硝氮 / Q 硝氮 Finally, f was calculated to be 0.15 × 10 = 1.5 (mL·L) / (mg·h); Q 硝氮 The concentration of purified nitrate nitrogen in wastewater;

[0069] Because the entire process of the early warning device is a single aerobic system without denitrification, and the oxygen provided by the denitrification system needs to be subtracted in the actual process, in actual operation, all NH3-N is converted to NO3-N, therefore the removed Q 硝氮 =Q 氨氮 -Q 硝氮剩余 According to wastewater discharge standards, the nitrate nitrogen concentration in the discharged wastewater should not exceed 10 mg / L, therefore -Q at this time 硝氮剩余 =10mg / L.

[0070] S4. During normal operation of the wastewater treatment system, Q 实气 =h×Q 理气 ×Q 进水 Where h is the correction coefficient, Q 进水 Q represents the influent flow rate of the biochemical treatment tank module in the wastewater treatment system. 实气 This refers to the actual aeration flow rate of the biological treatment tank module in the wastewater treatment system; while under normal wastewater conditions without pollution source impact, the flow rate is adjusted by Q. 实气 and Q 进水 Then, the dissolved oxygen concentration in the biological treatment tank module is brought to the baseline concentration. At this point, the correction coefficient h is calculated. When the wastewater is subjected to pollutant impact, the Q calculated in step S3 is adjusted. 理气 Q 进水Substituting the already calculated correction coefficient h into the formula Q 实气 =h×Q 理气 ×Q 进水 And thus Q is obtained. 实气 This will guide the aeration adjustment of wastewater treatment systems in response to pollutant shocks.

[0071] Preferably, the water quality early warning device further includes a data calibration method, which includes the following steps:

[0072] A1. Add pure water and sodium acetate to the buffer tank, adjusting the amount of sodium acetate added. Prepare multiple sets of wastewater with different COD concentrations in the buffer tank, and record the recovery time of dissolved oxygen to 2 mg / L and the aeration rate Q when it stabilizes at 2 mg / L. 气1 According to formula Q 气1 =a×Q cod +b×Q 氨氮 +c calculates and calibrates a;

[0073] A2. Add pure water and ammonium chloride to the buffer tank, adjusting the amount of ammonium chloride added. Prepare multiple sets of wastewater with different ammonia nitrogen concentrations in the buffer tank, and record the recovery time of dissolved oxygen to 2 mg / L and the aeration rate Q when it stabilizes at 2 mg / L. 气2 According to formula Q 气2 =a×Q cod +b×Q 氨氮 +c calculates and calibrates b;

[0074] A3. Based on step A2, the correspondence between nitrate nitrogen and ammonia nitrogen concentrations is calibrated; where Q 氨氮 =d×Q 硝氮 +e, where d is the concentration coefficient and e is the concentration of nitrate nitrogen in the sludge returned from the secondary sedimentation tank; d is calibrated using the above formula.

[0075] Preferably, when the incoming water is subject to toxic shock, activated carbon is added to the emergency tank for sedimentation. The sediment is then sent to the dewatering room for dewatering along with other sludge. After the incoming water stabilizes, the aeration rate of the aeration blower is adjusted to maintain the dissolved oxygen in the aeration warning tank at 2 mg / L. A small amount of wastewater from the emergency tank is then sent to a buffer tank for dilution. The dissolved oxygen concentration is monitored by a dissolved oxygen meter probe to ensure that it is below 4 mg / L. Finally, the wastewater gradually flows back from the emergency tank to the influent pumping station and enters the normal wastewater treatment process.

[0076] The specific results and calculations obtained from the actual operation of the above wastewater treatment method are as follows:

[0077] 1. Add pure water and sodium acetate to the buffer tank, adjusting the amount of sodium acetate added. Prepare multiple sets of wastewater with different COD concentrations in the buffer tank. The COD concentrations prepared with sodium acetate are 100 mg / L, 200 mg / L, 300 mg / L, 400 mg / L, 500 mg / L, and 600 mg / L. The data after the water quality early warning device is in operation are as follows.

[0078] <![CDATA[Q 气1 (ml / h)]]> 509.8 1117.6 1685 2308.6 2838.8 3198.8

[0079] Then according to Q 气1 =a×Q cod +b×Q 氨氮 +c reveals that at this point, the wastewater Q 氨氮 The value of Q is 0. By simplifying the above formula, we can obtain Q. 气1 =a×Q cod +c, and then perform linear fitting on the above table as follows: Figure 4 As shown, then through Figure 4 The equation of the straight line in the equation can be calculated to be a = 5.49, and at this time c = 19.88, where, when Q cod When Q is equal to 0, 气1 =c, where c is the oxygen consumed by other substances, such as the endogenous respiration of sludge, which also consumes oxygen in the gas.

[0080] 2. Add pure water and ammonium chloride to the buffer tank and adjust the amount of ammonium chloride added. Configure multiple sets of wastewater with different ammonia nitrogen concentrations in the buffer tank. The ammonia nitrogen concentrations are 10mg / L, 20mg / L, 30mg / L, 40mg / L, 50mg / L and 60mg / L respectively. The data after the water quality early warning device is running are as follows, and the readings of the nitrile nitrogen meter are also integrated in the table below.

[0081] Aeration flow rate (ml / h) 382.2 779.4 1105.4 1580.6 1773.8 2290 NO3-N concentration (mg / L) 8.49 18.87 24.33 32.27 37.67 45.07

[0082] According to Q 气2 =a×Q cod +b×Q 氨氮 +c reveals that at this point, the wastewater Q cod Q 氨氮 The value of Q is 0. By simplifying the above formula, we can obtain Q. 气2 =a×Q 氨氮 +c, and then perform linear fitting on the above table as follows: Figure 5 As shown, then through Figure 5 The equation of the straight line in the equation can be calculated to be b = 37.14, and c = 18.83 at this time. Where, when Q... 氨氮 When Q is equal to 0, 气2 =c, where c is the oxygen consumed by other substances, such as the endogenous respiration of sludge, which also consumes oxygen in the gas.

[0083] Then, the average value of c after the two calibrations is calculated as c = (19.88 + 18.83) ÷ 2 = 19.36.

[0084] According to Q 氨氮 =d×Q 硝氮 +e, where d is the concentration coefficient and e is the concentration of nitrate nitrogen in the sludge returned from the secondary sedimentation tank; the nitrate nitrogen concentration in the table above is the reading of the nitrate nitrogen meter, while the ammonia nitrogen concentration is the known configured concentration. Linear fitting of the data in the table above is as follows: Figure 6 As shown, the equation of the straight line is obtained. The calculation shows that d = 1.40 and e = -4.02. The negative value of e is due to the sludge being returned from the secondary sedimentation tank to the early warning device. The sludge contains nitrate nitrogen, and the concentration of nitrate nitrogen in the sludge is 8 mg / L. The sludge will be diluted when it is returned to the aeration early warning tank, so the value of e is -4.02 at this time.

[0085] After the above calibration, under normal sewage treatment system conditions, Q 实气 =h×Q 理气 ×Q 进水 Where h is the correction coefficient, Q 进水 Q represents the influent flow rate of the biochemical treatment tank module in the wastewater treatment system. 实气 This refers to the actual aeration flow rate of the biological treatment tank module in the wastewater treatment system; while under normal wastewater conditions without pollution source impact, the flow rate is adjusted by Q. 实气 and Q 进水 After the dissolved oxygen concentration in the biological treatment tank module reaches the baseline concentration, the correction coefficient h can be calculated. When the wastewater is subjected to pollutant impact, the Q calculated in step S3 will be adjusted accordingly. 理气 Q 进水 Substituting the already calculated correction coefficient h into the formula Q 实气 =h×Q 理气 ×Q 进水 And thus Q is obtained. 实气 This will guide the aeration adjustment of wastewater treatment systems in response to pollutant shocks.

[0086] After adopting the above technical solution, the effect of this utility model is as follows: The wastewater treatment method uses the dissolved oxygen meter probe 5 and the nitrate meter 6 in the water quality early warning device to monitor the dissolved oxygen and nitrate nitrogen in the wastewater in real time, and adjusts the aeration rate of the aeration blower 2 to stabilize the dissolved oxygen concentration in the early warning device. Then, it judges the status of the incoming water in the system, whether it is normal influent, toxic shock, COD shock, or ammonia nitrogen shock. Then, it calculates and specifically guides the aeration rate in the subsequent biological treatment tank module. The process parameters of the overall wastewater treatment are adjusted more quickly and accurately, and the aeration accuracy can be guaranteed. It is not easy to have insufficient aeration or excessive aeration. Excessive aeration can easily lead to increased energy consumption of the aeration blower.

[0087] The above-described embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications and alterations to the technical solution of the present utility model without departing from its design spirit shall fall within the protection scope defined by the claims of the present utility model.

Claims

1. A water quality early warning device, characterized in that: The system includes a buffer tank, an aeration warning tank, a warning sedimentation tank, and an electrical control device. The bottom of the aeration warning tank is equipped with an aeration pipe with a flow meter and an aeration blower connected to the aeration pipe. An inlet pipe with an inlet pump is installed on the aeration warning tank, and the inlet of the inlet pipe is inserted into the buffer tank. The buffer tank also has a sampling inlet pipe. The upper part of the aeration warning tank is connected to the warning sedimentation tank via a connecting pipe. The warning sedimentation tank has a sludge supply pipe connected to the secondary sedimentation tank in the wastewater treatment system. The sludge supply pipe is equipped with an early warning sludge pump. The bottom of the early warning sedimentation tank is equipped with an early warning sludge return pipe connected to the aeration early warning tank. The early warning sludge return pipe is equipped with an early warning return pump. The early warning sedimentation tank is also equipped with an early warning sludge discharge pipe. The top of the early warning sedimentation tank is equipped with an overflow pipe. The aeration early warning tank is equipped with a dissolved oxygen meter probe and a nitrate meter for detecting the dissolved oxygen concentration and nitrate nitrogen concentration in the wastewater. The electrical control device is electrically connected to the aeration blower, the return pump, the inlet pump, the dissolved oxygen meter probe, and the nitrate meter.

2. The water quality early warning device as described in claim 1, characterized in that: The flow meter is a differential pressure flow meter, and the flow meter is electrically connected to the electronic control device.

3. The water quality early warning device as described in claim 2, characterized in that: The configuration buffer container includes a container body, and the upper end of the container body is provided with a configuration addition port for adding ammonium chloride or sodium acetate.

4. A water quality early warning device as described in claim 3, characterized in that: The early warning sedimentation tank is also equipped with a sludge position detection sensor for detecting the sludge position in the early warning sedimentation tank, or the early warning sludge discharge pipe is located above the sludge supply pipe, and the sludge discharge flow rate of the early warning sludge discharge pipe is greater than the supply flow rate of the sludge supply pipe.

5. A wastewater treatment system, comprising an influent pumping station, with a coarse filtration device installed upstream of the pumping station according to the wastewater flow direction; a fine filtration device and an aerated grit chamber connected downstream of the pumping station, the fine filtration device also connected to an emergency tank; a biological treatment tank module installed downstream of the aerated grit chamber, a secondary sedimentation tank connected downstream of the biological treatment tank module, a carbon mixing tank and a coagulation sedimentation tank connected downstream of the secondary sedimentation tank, a sand filter connected downstream of the coagulation sedimentation tank, and a chlorination contact tank connected downstream of the sand filter, characterized in that: The wastewater treatment system further includes the water quality early warning device as described in claim 1, wherein the sampling inlet pipe is connected to the inlet pipe of the inlet pump house, and the sludge discharge pipe is connected to the outlet pipe of the inlet pump house; the emergency pool is connected to the early warning buffer tank through a pipeline; the wastewater treatment system further includes a sludge treatment module, wherein the sludge treatment module includes a sludge mixing well, a sludge thickening tank is connected downstream of the sludge mixing well, a sludge storage tank is connected downstream of the sludge thickening tank, a dewatering room is provided downstream of the sludge storage tank, the secondary sedimentation tank and the coagulation sedimentation tank are both connected to the sludge mixing well through sludge discharge pipelines, the sludge discharge pipeline of the secondary sedimentation tank is also connected to a sludge external return pipeline connected upstream of the biochemical treatment tank module, and the early warning sludge return pipeline is connected to the secondary sedimentation tank.

6. A wastewater treatment system as described in claim 5, characterized in that: The biochemical treatment tank module includes a pre-anoxic tank, an anaerobic tank, a first anoxic tank, a first aerobic tank, a second anoxic tank, and a second aerobic tank connected in accordance with water flow. A mixed liquor return pipeline is provided between the first aerobic tank and the first anoxic tank. The sludge external return pipeline is connected to the sludge discharge pipeline and the pre-anoxic tank. The first aerobic tank and the second aerobic tank are connected to the air supply system of the blower room.

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