CN211505300U

CN211505300U - Single-probe real-time sewage toxicity monitoring system

Info

Publication number: CN211505300U
Application number: CN201921994690.1U
Authority: CN
Inventors: 陈振国; 穆道军; 钱玮; 晁建颖; 时元贵
Original assignee: Suzhou Ark Environmental Development Co ltd
Current assignee: Suzhou Ark Environmental Development Co ltd
Priority date: 2019-11-18
Filing date: 2019-11-18
Publication date: 2020-09-15
Anticipated expiration: 2029-11-18

Abstract

The utility model discloses a single probe sewage toxicity real-time monitoring system, including the effluent water sump, the sludge impoundment, the perfect blender, the aeration head, the aeration machine, rotatory STREAMING bioreactor that pushes away, DO electrode probe and PLC control early warning system, perfect blender switch-on effluent water sump and sludge impoundment, the entry of perfect blender intercommunication rotatory STREAMING bioreactor that pushes away, the export of rotatory STREAMING bioreactor that pushes away is through backwash pump switch-on perfect blender, the perfect blender bottom is provided with the aeration head, the aeration machine is connected to the aeration head, the aeration machine is to the interior constant aeration rate aeration of perfect blender, DO electrode probe places in the outlet side of perfect blender, DO electrode probe and PLC control early warning headtotail. The utility model discloses a backward flow mode makes and only needs to set up single probe, reduces the misstatement rate, reduce cost.

Description

Single-probe real-time sewage toxicity monitoring system

Technical Field

The utility model relates to a sewage treatment technical field, concretely relates to single probe sewage toxicity real-time monitoring system.

Background

With the development of economic society and particularly industry in China, a large amount of industrial wastewater which is not properly treated and domestic sewage are mixed and discharged into an urban sewage treatment plant, so that the fluctuation of the quality of inlet water is caused, and the impact is brought to the stable operation of the treatment process. Especially, the existing urban sewage treatment plants in China widely adopt an activated sludge method, the components of industrial wastewater are complex, toxic and harmful substances which have inhibition on the activated sludge may exist, if the content of the toxic and harmful substances exceeds a certain degree (such as accidental discharge or steal discharge), the toxic and harmful substances can cause harm to biological treatment units of the sewage treatment plants, the quality of effluent water is deteriorated, the effluent water cannot reach the standard and can not be discharged, even a large amount of microorganisms die in serious conditions, the biological treatment units are damaged irreversibly, the activated sludge needs to be inoculated and cultured again, great difficulty is caused to the operation management of the sewage treatment plants, and great economic loss and environmental pollution accidents are caused. Therefore, real-time early warning of water quality fluctuation of inlet water is very necessary. The biological inhibition degree of the urban sewage can be early warned, corresponding operation management measures (such as increasing the sludge reflux amount, increasing the concentration dilution of tail water reflux and the like or discharging into a regulating tank for delayed post-treatment and the like) can be taken in advance, the normal operation of a biological treatment unit of a sewage treatment plant is ensured, and the effluent quality is ensured.

Based on the difference of the early warning method and principle, the early warning method can be roughly divided into several categories: (1) the toxicity early warning method based on the sensing current and the microbial fuel cell as the basic principle is completely in the theoretical exploration stage in the current research, and has a great difference from the practical application theoretically due to the complexity, the concealment and the environmental sensitivity of the wastewater toxicity. (2) The method based on biological early warning is mostly based on certain bacteria, algae, micro-animals and the like in water, and toxicity is judged through feedback of microorganisms and organisms. Nevertheless, such a method based on a certain biofeedback is very sensitive to external environmental disturbances and cannot maintain the culture for a long time: if the luminous bacteria as a single flora has any adverse effect on the outside, the growth factors can be fed back, and the accuracy of toxicity early warning is not facilitated; because the online culture of the luminous bacteria can not be realized, the engineering application for realizing the online early warning has great difficulty. (3) Based on activated sludge process (microbial community), feed back the research of the toxic material in waste water through microorganism OUR, need measure the parameter of two positions of water inlet and delivery port respectively with two mostly, because calibration error, equipment precision error, detection error etc. can cause great systematic error in two instrument measurement processes, lead to accuracy, stability not high, be unfavorable for practical application.

In summary, the application and research of the sewage toxicity early warning device also have the following problems:

(1) due to the fact that the factors influenced by the environment are more, the waste water is variable and complex, a monitoring and early warning method based on current, certain bacteria and the like is determined in principle, and the method is extremely easy to interfere by the environment, low in accuracy and difficult in engineering application, so that most of the methods are in a theoretical research stage and are not applied on line.

(2) According to the early warning method based on the activated sludge OUR, two groups of DO detectors are needed for OUR measurement, the false warning probability is increased due to system errors, the accuracy and the stability are reduced, and the research and the application of the method are limited.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a single probe sewage toxicity real-time monitoring system can realize utilizing single probe real-time supervision DO mutation rate through control aeration rate is invariable and control sewage backward flow, and then judges that activated sludge receives the suppression condition.

In order to solve the technical problem, the utility model provides a single probe sewage toxicity real-time monitoring system, including effluent water sump, sludge impoundment, complete mixer, aeration head, aeration machine, rotatory STREAMING bioreactor, DO electrode probe and PLC control early warning system that pushes away, complete mixer switch-on effluent water sump and sludge impoundment, complete mixer intercommunication rotatory STREAMING bioreactor's entry, the export of rotatory STREAMING bioreactor passes through the backwash pump switch-on complete mixer, the complete mixer bottom is provided with the aeration head, the aeration head is connected the aeration machine, the aeration machine to constant aeration volume aeration in the complete mixer, DO electrode probe place in the exit side of complete mixer, DO electrode probe with PLC control early warning system connects.

Further, the sewage tank is communicated with the complete mixer through a sewage pump, and the sludge tank is communicated with the complete mixer through a sludge pump.

Further, a magnetic stirrer is arranged below the complete mixer, and a stirrer is arranged in the complete mixer.

Further, the outlet of the reflux pump is remote from the outlet of the thorough mixer.

The utility model discloses a single probe sewage toxicity real-time monitoring system compares beneficial effect with prior art: only one DO probe is adopted, so that instrument interference cannot be generated, the false alarm rate is low, the cost is low, the monitoring is convenient, meanwhile, the real-time monitoring can be met, and the monitoring effect on the sewage is ensured.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

Referring to fig. 1, it is the schematic diagram of a single-probe real-time monitoring system for sewage toxicity of the present invention, which comprises a sewage tank 1, a sludge tank 2, a complete mixer 3, an aeration head 4, an aerator 5, a rotary plug-flow type bioreactor 6, a DO electrode probe 7 and a PLC control early warning system 8. The complete mixer 3 is communicated with the sewage tank 1 and the sludge tank 2 through a sewage pump 9 and a sludge pump 10 respectively, sewage and sludge are controlled to enter the complete mixer 3 for mixing in a constant proportion through the sewage pump 9 and the sludge pump 10, and accordingly constant aeration amount of the sludge-water mixture can be guaranteed through controlling aeration intensity. The complete mixer 3 is communicated with the inlet of the rotary plug-flow type bioreactor 6, and the outlet 14 of the rotary plug-flow type bioreactor 6 is communicated with the complete mixer 3 through a reflux pump 11. The sludge-water mixture fed into the rotary plug flow type bioreactor 6 is stirred, mixed and consumed with oxygen because a rotational flow is formed in the rotary plug flow type bioreactor 6, and the dissolved oxygen of the sludge in the reactor 6 is consumed, so that the dissolved oxygen of the part of the sludge-water mixture is lower than that of the sludge-water mixture in the complete mixer 3, and the part of the sludge-water mixture is mixed with the sludge-water mixture with high dissolved oxygen in the complete mixer 3 after flowing back to the complete mixer 3, so that the dissolved oxygen of the sludge-water mixture in the complete mixer 3 is reduced. If the oxygen consumption of the slurry-water mixture in the reactor 6 is kept constant, the dissolved oxygen content measured after stabilization in the complete mixer 3 is kept constant and lower than the preset dissolved oxygen content of the aerated slurry-water mixture, and if toxicity exists in the sewage, the oxygen consumption of the sludge is suppressed or the oxygen consumption is increased greatly, and after the sewage is refluxed to the complete mixer 3, the dissolved oxygen content measured in the mixer fluctuates. If pollutants for inhibiting sludge oxygen consumption exist, the dissolved oxygen mutation rate is reduced, the actual dissolved oxygen mutation rate is compared with the preset dissolved oxygen mutation rate, and if the change of the dissolved oxygen mutation rate exceeds the preset range, an alarm is given; if organic pollutants which consume a large amount of dissolved oxygen exist, the mutation rate of the dissolved oxygen is increased, the actual mutation rate of the dissolved oxygen is compared with the preset mutation rate of the dissolved oxygen, and if the change of the mutation rate of the dissolved oxygen exceeds the preset range, an alarm is given. In order to control the initial dissolved oxygen content of the sludge-water mixture in the thorough mixer 3 to be constant, the aeration head 4 is arranged at the bottom of the thorough mixer 3, the aeration head 4 is connected with the aerator 5, and the aerator 5 aerates the inside of the thorough mixer 3 at a constant aeration rate. The DO electrode probe 7 is placed on the outlet 14 side of the complete mixer 3, the sludge-water mixture is fully aerated and mixed, the dissolved oxygen content is stable, in order to further ensure that the returned sludge-water mixture is uniformly mixed with the mixture in the complete mixer 3, a magnetic stirrer 12 is arranged below the complete mixer 3, and a stirrer 13 is arranged in the complete mixer 3. To prevent the returned muddy water mixture from directly flowing out from the perfect mixer outlet 14, the outlet of the return pump 11 is away from the outlet 14 of the perfect mixer 3. So that the refluxed muddy water mixture can be sufficiently mixed with the original mixture in the perfect mixer 3 by the magnetic stirrer 12. And the DO electrode probe 7 is connected with the PLC control early warning system 8. The toxicity of the sewage is obtained by inputting parameters of the DO electrode probe 7 into the PLC control early warning system 8 for calculation and analysis and then comparing the parameters with preset parameters. Because this system does not detect concrete pollutant, but monitors dissolved oxygen volume's change, no matter how the fungus crowd is in mud, as long as there is the pollutant that causes the influence to dissolved oxygen volume, can be monitored, carry out the early warning to the sewage of advancing the factory, and sewage and mud last inflow outflow complete mixer, can guarantee the continuous monitoring to sewage, do not have the vacuum phase.

The monitoring method adopting the monitoring system comprises the following steps:

s01, pumping sewage flow Q1 and sludge flow Q2 into a complete mixer according to a constant volume ratio, and adding the initial DO₀Inputting the value into a PLC control early warning system, opening an aerator, and ensuring that the DO value of the initial dissolved oxygen in the complete mixer is DO₀；

S02, enabling the aerated muddy water mixture to enter a rotary plug flow type bioreactor at a flow rate of Q3 through a reflux pump, refluxing to a complete mixer, and monitoring the dissolved oxygen DO of the refluxed and mixed muddy water mixture on line by utilizing a DO electrode probe₁；

S03, mixing DO₁The value of (A) is input into a PLC control early warning system and is according to a formula DO_T1Mutation Rate k₁＝(DO₀-DO_1T1)/DO₀Obtaining DO_T1Wherein DO_1T1DO at time T1_TA value;

s04, presetting a DO mutation rate value in the PLC control early warning system, and calculating the DO calculated in S03_TAnd comparing the mutation rate with a preset value, and judging the toxicity intensity of the wastewater.

Further, the DO calculated in S03 is added in S04_T1Mutation Rate k₁Comparison with a preset value k:

when |. k-k₁| k is less than or equal to 10%, no alarm is given, indicating that the wastewater is non-toxic;

when 10% < |. k-k₁| k is less than or equal to 30%, and the PLC controls the early warning system to give an alarm to indicate that the wastewater has toxicity, but the toxicity is not strong, so that light attention needs to be paid;

when 30% < |.k-k₁| k is less than or equal to 50%, the PLC controls the early warning system to give an alarm, which indicates that the wastewater has toxicity and strong toxicity, and needs to pay proper attention, and appropriate measures are taken according to the situation;

when 50% < |.k-k₁| k, the PLC controls the early warning system to give an alarm, which indicates that the wastewater has toxicity and strong toxicity, and measures are required to be taken immediately.

When an alarm needs to be sent out, according to | k-k₁And | k values are different, the PLC controls the early warning system to send out different warning signals of orange, yellow, red and the like.

The method principle of the utility model is that:

the respiration rate (OUR) is a parameter for representing the microbial activity in the activated sludge, the large OUR value indicates good microbial activity, the small OUR value indicates poor microbial activity, the OUR value is related to the dissolved oxygen content, and the calculation formula of the OUR value is as follows: OUR ═ DO_Into-DO_{Go out}) and/T, wherein T is the hydraulic retention time of the bioreactor. If the dissolved oxygen content DO at the water inlet end is maintained_IntoRelatively stable, then the dissolved oxygen content DO at the water outlet end can be passed_{Go out}To determine changes in OUR values, i.e., DO_{Go out}The OUR value is increased, and the microbial activity is inhibited. DO_{Go out}The values are relatively unchanged or decreased, indicating that microbial activity is not inhibited. In the method, the sludge-water mixture is reacted in a reactor for oxygen consumption and DO₁The dissolved oxygen content is obtained by mixing the mixture with the original mixture after the mixture flows out of the reactor, if DO₁A decrease in the value indicates that microbial activity is not inhibited, DO₁The value increases, the microbial activity is inhibited.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

Claims

1. The single-probe real-time sewage toxicity monitoring system is characterized by comprising a sewage tank, a sludge tank, a complete mixer, an aerator, a rotary plug-flow type bioreactor, a DO electrode probe and a PLC (programmable logic controller) control early warning system, wherein the complete mixer is communicated with the sewage tank and the sludge tank, the complete mixer is communicated with an inlet of the rotary plug-flow type bioreactor, an outlet of the rotary plug-flow type bioreactor is communicated with the complete mixer through a reflux pump, the aerator is arranged at the bottom of the complete mixer and connected with the aerator, the aerator aerators aerate the complete mixer at constant aeration rate, the DO electrode probe is arranged at an outlet side of the complete mixer, and the DO electrode probe is connected with the PLC control early warning system.

2. The real-time single-probe sewage toxicity monitoring system of claim 1, wherein the sewage tank is communicated with the thorough mixer through a sewage pump, and the sludge tank is communicated with the thorough mixer through a sludge pump.

3. The real-time single-probe sewage toxicity monitoring system of claim 1, wherein a magnetic stirrer is arranged below the complete mixer, and a stirrer is arranged in the complete mixer.

4. The real-time single probe sewage toxicity monitoring system of claim 1, wherein the outlet of the reflux pump is remote from the outlet of the thorough mixer.