An intelligent sewage treatment system

Abstract

The invention relates to the technical field of sewage treatment, and in particular to an intelligent sewage treatment system. The invention provides a nitrification unit, a denitrification unit, a pre-analysis unit, and an intelligent adjustment unit. A plurality of light transmission detection modules are arranged in the nitrification unit, and a tray module, a thickness measurement module, and a plurality of mud discharge ports are arranged in the denitrification unit. The pre-analysis unit obtains a water characteristic characterization value through the water transmittance at different heights under different aeration states of an aeration mechanism to determine whether water impurities have property characteristics. The property classification category of water impurities is determined according to the change of sludge in the tray by the intelligent adjustment unit, and a treatment method of the sludge in the tray is selected according to the property classification category. Thus, the properties of water impurities are classified according to the actual situation of sewage, the treatment method of sludge in sewage is adaptively adjusted, and the release efficiency of internal carbon sources in sewage and the efficiency of sewage denitrification are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to an intelligent sewage treatment system. Background Art

[0002] With the rapid development of industrialization and urbanization, the output of industrial wastewater and domestic sewage has increased significantly. Sewage treatment is not only a need for environmental protection and public health, but also an important means to achieve sustainable development and promote economic and social development. Converting sewage into recycled water after treatment and using it for agricultural irrigation, industrial water and urban greening can effectively alleviate the increasingly tense situation of global water resources, realize the recycling of water resources, and alleviate the problem of water shortage.

[0003] Increasingly stringent environmental regulations and water quality emission standards require sewage treatment systems to treat sewage more accurately and efficiently. The treatment process of traditional sewage treatment systems is relatively fixed and difficult to flexibly adjust according to real-time changes in sewage. Intelligent sewage treatment systems can better meet these requirements and dynamically adjust the effluent quality after sewage treatment according to the pollution absorption capacity and water quality requirements of the environmental water body, thereby achieving effective protection of the environment. However, in the denitrification process of sewage treatment, the rational use of endogenous carbon sources, the reduction of external carbon source input, and the avoidance of energy waste are technical issues that need to be urgently addressed.

[0004] For example, China's patent application publication number: CN111499008A, the invention discloses a sewage treatment system, which relates to the technical field of sewage treatment. The first treatment device of the sewage treatment system of the application is filled with a first biofilm filler, and the filling rate of the first biofilm filler reaches more than 50%. Since the filling rate of the first biofilm filler is relatively high, a filter bed can be formed, which can adsorb and filter out suspended solids in the sewage, which is beneficial to the subsequent deep purification of the sewage. The first biofilm filler with a high filling rate can reduce the fluidity in the first treatment device, so that a local hypoxic state occurs in the first treatment device, which is beneficial to achieve denitrification and reduce the nitrogen content in the sewage. The sludge at the bottom of the first treatment device releases internal carbon sources, which can be used for the denitrification process. The sewage treatment system of the application has a good denitrification effect.

[0005] The prior art still has the following problems:

[0006] The existing technology does not take into account that during the denitrification process of sewage treatment, the different properties of water impurities in the sewage will affect the full utilization of the internal carbon source and thus affect the denitrification efficiency of the sewage. The existing technology cannot adaptively adjust the treatment method of sludge in the sewage according to the properties of water impurities, which affects the release efficiency of the internal carbon source in the sewage and the efficiency of sewage denitrification. Summary of the invention

[0007] To this end, the present invention provides an intelligent sewage treatment system to overcome the problem that the prior art cannot adaptively adjust the treatment method of sludge in sewage according to the properties of water impurities, affecting the release efficiency of internal carbon sources in sewage and the efficiency of sewage denitrification.

[0008] To achieve the above object, the present invention provides an intelligent sewage treatment system, comprising:

[0009] The nitrification unit includes a nitrification tank for nitrifying sewage, an aeration mechanism arranged at the bottom of the nitrification tank for introducing air, and a plurality of light transmission detection modules arranged at preset height intervals on the side wall of the nitrification tank for obtaining the light transmittance of the water body;

[0010] A denitrification unit, which is connected to the nitrification unit, comprises a denitrification tank for carrying out a denitrification reaction on the water body that has completed the nitrification reaction, a tray module arranged at the bottom of the denitrification tank for receiving sludge, a thickness measurement module arranged at the side wall of the denitrification tank for obtaining the thickness of the sludge, and a plurality of sludge discharge ports arranged at the side wall of the denitrification tank for discharging the sludge;

[0011] The tray module comprises a tray arranged at the bottom of the denitrification tank and a movable supporting mechanism arranged at the bottom of the tray for changing the inclination angle of the tray;

[0012] A pre-analysis unit connected to the nitrification unit is used to calculate the water body characteristic value according to the water body transmittance at different heights under different aeration states of the aeration mechanism to determine whether the water impurities have property characteristics;

[0013] The intelligent regulating unit is connected to the denitrification unit and the pre-analysis unit respectively, and is used to determine the property classification of water impurities according to the thickness change of the sludge in the tray, and select the treatment method of the sludge in the tray according to the property classification, including:

[0014] adjusting the opening and closing states of a plurality of mud discharge ports in the denitrification pool according to the water body characteristic representation value;

[0015] Or, adjust the tray tilt angle according to the change in the thickness of the sludge in the tray.

[0016] Furthermore, the denitrification tank also includes a water inlet arranged on the side wall of the denitrification tank for introducing the water in the nitrification tank, and a drain outlet arranged on the side wall of the denitrification tank for discharging the water that has completed the denitrification reaction.

[0017] Furthermore, the pre-analysis unit is used to obtain water body characteristic characterization values, wherein:

[0018] The pre-analysis unit calculates the maximum transmittance difference of water body transmittance at different heights under a preset first aeration amount, calculates the maximum transmittance difference of water body transmittance at different heights under a preset second aeration amount, and determines the absolute value of the difference between the maximum transmittance difference under the first aeration amount and the maximum transmittance difference under the second aeration amount as the water body characteristic characterization value.

[0019] Furthermore, the pre-analysis unit is used to determine whether the water impurities have property characteristics, wherein:

[0020] If the water body undergoing denitrification reaction does not meet the impurity stability condition, the pre-analysis unit determines that the water impurities in the water body have property characteristics;

[0021] Among them, the impurity stability condition is that the water body characteristic representation value corresponding to the water body does not exceed a preset transmittance threshold.

[0022] Furthermore, the thickness measurement module is used to obtain the thickness change of the sludge in the tray, wherein:

[0023] The thickness measurement module obtains the thickness value of the sludge in the tray in real time, and draws a sludge thickness value change curve showing the thickness value changing with time, wherein the sludge thickness value change curve takes time as the horizontal axis and the thickness value as the vertical axis.

[0024] Furthermore, the intelligent adjustment unit is used to determine the properties of the water impurities and classify them, wherein:

[0025] The intelligent adjustment unit determines the points whose slopes do not exceed a preset slope threshold as sludge change characteristic points according to the slopes of several points on the sludge thickness value change curve, and determines the sludge change characteristic duration according to the horizontal coordinate values ​​corresponding to the sludge change characteristic points;

[0026] If the thickness change of the sludge in the tray meets the property differentiation expression condition, the intelligent adjustment unit determines that the water impurities are a strongly dominant category for property differentiation;

[0027] If the thickness change of the sludge in the tray does not meet the property differentiation expression condition, the intelligent adjustment unit determines that the water impurities are a weakly dominant category for property differentiation.

[0028] Furthermore, the property differentiation performance condition is that the ratio of the characteristic duration of the sludge change to the preset total sludge deposition duration does not exceed a preset ratio threshold.

[0029] Furthermore, the intelligent adjustment unit is used to select a treatment method for the sludge in the tray, wherein:

[0030] If the trait distinction category is a strongly dominant trait distinction category, the intelligent adjustment unit selects to adjust the opening and closing states of a plurality of mud discharge ports in the denitrification pool according to the water body characteristic representation value;

[0031] If the property distinction category is a weakly dominant property distinction category, the intelligent adjustment unit selects to adjust the tray tilt angle according to the thickness change of the sludge in the tray.

[0032] Furthermore, the intelligent adjustment unit is used to adjust the opening and closing states of a plurality of mud discharge ports in the denitrification tank, wherein:

[0033] The number of the mud discharge ports that remain in an open state is positively correlated with the water body characteristic characterization value, and the mud discharge ports are opened in sequence from the mud discharge port near the bottom of the denitrification tank upwards.

[0034] Furthermore, the tray tilt angle is negatively correlated with the ratio of the characteristic duration of sludge change to the preset total duration of sludge deposition.

[0035] Compared with the prior art, the beneficial effect of the present invention lies in that a nitrification unit, a denitrification unit, a pre-analysis unit, and an intelligent adjustment unit are arranged in the present invention, several groups of light transmission detection modules are arranged in the nitrification unit, and a tray module, a thickness measurement module, and several sludge discharge ports are arranged in the denitrification unit. The pre-analysis unit obtains a water body characteristic characterization value according to the water body light transmittance at different heights under different aeration states of the aeration mechanism to determine whether the water body impurities have property characteristics, and the property classification category of the water body impurities is determined according to the change of the sludge in the tray by the intelligent adjustment unit, and the treatment method of the sludge in the tray is selected according to the property classification category, thereby realizing the classification of the water body impurity properties according to the actual situation of the sewage, adaptively adjusting the treatment method of the sludge in the sewage, and improving the release efficiency of the internal carbon source in the sewage and the efficiency of the sewage denitrification.

[0036] In particular, the present invention obtains the water body characteristic representation value according to the water body transmittance at different heights under different aeration states of the aeration mechanism through the pre-analysis unit to determine whether the water body impurities have property characteristics. It can be understood that in the sewage treatment process, the impurities in the sewage water body may contain various solid sludges and flocculent sludges, and the state of the water body can be obtained through the water body transmittance. Under the first aeration amount condition, the water body transmittance is measured at different heights by the transmittance detection module, and the maximum transmittance difference of the water body transmittance at different heights is calculated, which can reflect the flocculent sludge and particles in the water body. The distribution of flocculent sludge can be characterized by the absolute value of the maximum transmittance difference of the water body at different heights under the second aeration amount, which can characterize the distribution of flocculent sludge and granular sludge after the impurity stability of the water body is changed. The distribution of flocculent sludge in the water body can be more accurately judged by calculating the absolute value of the maximum transmittance difference under different aeration conditions, and then the distribution of impurities in the water body can be quantified, thereby improving the release efficiency of internal carbon sources in sewage and the efficiency of sewage denitrification.

[0037] In particular, the present invention draws a sludge thickness value change curve of the sludge in the tray corresponding to the water impurities with property characteristics through the thickness measurement module. It can be understood that in sewage, there is a significant difference in the settling speed of granular sludge and flocculent sludge. The granular sludge is larger in mass and is significantly affected by gravity, and has a fast settling speed. In the initial stage of settling, the granular sludge in the water body will quickly settle into the tray under the action of gravity, while the flocculent sludge has a relatively slow settling speed due to its small particles, irregular shape and possible colloidal properties. The difference in settling speed of different types of sludge leads to changes in the growth rate of sludge thickness. By drawing a curve of the sludge thickness value in the tray changing with time, the sedimentation state changes of the water impurities can be intuitively obtained. Furthermore, by drawing a sludge thickness value change curve, the sedimentation state changes of the water impurities are quantified.

[0038] In particular, the present invention determines the properties of water impurities according to the slopes of several points on the sludge thickness value change curve and the proportion of the sludge change characteristic time by the intelligent adjustment unit. It can be understood that the accumulation rate of granular sludge is faster when it is settled and accumulated, and the slope value of the sludge thickness value change curve is larger. After the granular sludge is settled, the flocculent sludge settles and accumulates more slowly, which is reflected in the smaller corresponding slope value on the sludge thickness value change curve. When the slope value of a data point on the sludge thickness value change curve does not exceed the preset slope threshold, it indicates that the granular sludge in the water body has completed settling at the current moment corresponding to the data point. The present invention calculates the proportion of the time taken for granular sludge to complete sedimentation in the total sedimentation time to intuitively characterize the properties of impurities in the water body and distinguish the categories. The greater the proportion of the time taken for granular sludge to complete sedimentation in the total sedimentation time, the more granular sludge there is in the impurities in the water body; the smaller the proportion of the time taken for granular sludge to complete sedimentation in the total sedimentation time, the less granular sludge there is in the impurities in the water body. Furthermore, the properties of water impurities can be classified according to the actual situation of sewage, thereby improving the release efficiency of internal carbon sources in sewage and the efficiency of sewage denitrification.

[0039] In particular, under the condition that the composition category is a strongly dominant category for trait differentiation, the present invention adjusts the opening and closing states of several sludge outlets in the denitrification pool according to the water body characteristic characterization value. It can be understood that in the denitrification process, denitrifying bacteria need energy to drive the reduction of nitrate nitrogen or nitrite nitrogen to nitrogen gas for sewage denitrification. The organic carbon source contained in the sewage itself, such as biodegradable organic matter such as sugars, proteins and fats, is an important energy source for denitrifying bacteria. The presence of a large amount of flocculent sludge in water impurities will wrap up the denitrifying bacteria, making it difficult for the bacteria to obtain the carbon source in the surrounding water, hindering the contact between the denitrifying bacteria and the organic carbon source. In the case of tightness, the carbon source material may be wrapped inside the flocs, and the external denitrifying bacteria cannot access these carbon sources, thereby reducing the utilization efficiency of the carbon source. Under the condition that the composition category is a strong dominant category for property differentiation, it is characterized that there are more flocculent sludge in the impurities of the water body. The present invention adjusts the opening and closing states of several sludge discharge ports in the denitrification tank through the water body characteristic characterization value, and discharges a large amount of accumulated flocculent sludge from the denitrification tank in time, avoiding the denitrifying bacteria from being disturbed by the flocculent sludge and unable to effectively utilize the organic carbon source. Furthermore, the adaptive adjustment of the treatment method of sludge in sewage is achieved, and the release efficiency of the internal carbon source in sewage and the efficiency of sewage denitrification are improved.

[0040] In particular, the present invention adjusts the tray tilt angle according to the change of the sludge in the tray under the condition of weak dominant category of property distinction. It can be understood that, under the condition of weak dominant category of property distinction, there is less flocculent sludge in the water impurities, and most of the water impurities are granular sludge deposited in the tray. The present invention avoids the obstruction of the flocculent sludge on the contact between the carbon source in the granular sludge and the external denitrifying bacteria by adjusting the tray tilt angle, increases the contact area between the carbon source in the granular sludge and the external denitrifying bacteria, and further realizes the adaptive adjustment of the sludge treatment method in the sewage, thereby improving the release efficiency of the internal carbon source in the sewage and the efficiency of sewage denitrification.

[0041] In particular, the present invention adjusts the number of sludge outlets to remain in an open state and is positively correlated with the water body characteristic characterization value. It can be understood that the larger the water body characteristic characterization value, the greater the content of flocculent sludge in the water body impurities, the greater the obstacle to the contact between denitrifying bacteria and organic carbon sources, and the more necessary it is to discharge the flocculent sludge quickly. The present invention opens the sludge outlets from bottom to top near the bottom of the denitrification tank to quickly discharge the flocculent sludge. The greater the content of flocculent sludge, the more sludge outlets are opened and the faster the sludge discharge rate, thereby improving the release efficiency of the internal carbon source in the sewage and the efficiency of sewage denitrification.

[0042] In particular, the inclination angle of the tray of the present invention is negatively correlated with the ratio of the characteristic duration of sludge change to the preset total sludge deposition duration. It can be understood that when the flocculent sludge is less, the movable support mechanism only needs to adjust a smaller deflection angle to adjust the tray, thereby increasing the contact area between the carbon source in the granular sludge and the external denitrifying bacteria, and reducing the obstruction of the flocculent sludge to the contact between the carbon source in the granular sludge and the external denitrifying bacteria. The smaller the ratio is, the more flocculent sludge is, and the larger the deflection angle the movable support mechanism needs to adjust to adjust the inclination angle of the tray, so as to increase the contact area between the carbon source in the granular sludge and the external denitrifying bacteria, avoid the obstruction of the flocculent sludge to the contact between the carbon source in the granular sludge and the external denitrifying bacteria, thereby improving the release efficiency of the internal carbon source in the sewage and the efficiency of sewage denitrification. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A simplified structural diagram of an intelligent sewage treatment system according to an embodiment of the present invention;

[0044] Figure 2 This is a functional block diagram of an intelligent sewage treatment system according to an embodiment of the present invention;

[0045] Figure 3 A logic flow chart of the pre-analysis unit of the embodiment of the present invention for determining whether water impurities have property characteristics;

[0046] Figure 4A logic flow chart of the intelligent adjustment unit in an embodiment of the present invention selecting a treatment method for sludge in a tray;

[0047] In the figure: 1-nitrification tank; 2-light transmission detection module; 3-aeration mechanism; 4-water inlet; 5-denitrification tank; 6-sludge outlet; 7-tray; 8-movable support mechanism; 9-drainage outlet; 10-thickness measurement module. DETAILED DESCRIPTION

[0048] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0049] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0050] It should be noted that, in the description of the present invention, terms such as "upper", "lower", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0051] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] See also Figure 1 as well as Figure 2 As shown, Figure 1 The structure diagram of the intelligent sewage treatment system according to the embodiment of the present invention is shown in FIG. Figure 2 This is a functional block diagram of an intelligent sewage treatment system according to an embodiment of the present invention. An intelligent sewage treatment system according to the present invention includes:

[0053] The nitrification unit includes a nitrification tank 1 for nitrifying the sewage, an aeration mechanism 3 arranged at the bottom of the nitrification tank 1 for exposing the sewage to air, and a plurality of light transmission detection modules arranged at predetermined height intervals on the side wall of the nitrification tank for obtaining the light transmittance of the water body;

[0054] Specifically, the present invention does not limit the specific structure of the aeration mechanism 3. Preferably, it can be a blower aeration device, and the aeration fan presses air into the aeration pipe, and the air enters the sewage in the nitrification tank 1 through the aeration head. This is the prior art and will not be repeated here.

[0055] Specifically, the present invention does not limit the specific structure of the light transmittance detection module 2. Preferably, it can be composed of an optical sensor and a light beam emitter. The optical sensor calculates the light transmittance of the water body by measuring the attenuation degree of light intensity, which will not be repeated here.

[0056] Specifically, the height intervals of each group of light transmittance detection modules can be set by technicians in this field according to the detection accuracy requirements of water transmittance. The higher the detection accuracy requirements, the shorter the height intervals. Preferably, the height intervals can be 40 cm.

[0057] A denitrification unit, which is connected to the nitrification unit, comprises a denitrification tank 5 for carrying out a denitrification reaction on a water body that has completed a nitrification reaction, a tray module arranged at the bottom of the denitrification tank 5 for receiving sludge, a thickness measurement module 10 arranged on the side wall of the denitrification tank for obtaining the thickness of the sludge, and a plurality of sludge discharge ports 6 arranged on the side wall of the denitrification tank 5 for discharging the sludge, wherein the sludge discharge ports 6 are distributed along the height direction of the denitrification tank 5 at preset height intervals;

[0058] Specifically, the present invention does not limit the specific structure of the thickness measurement module 10. Preferably, it can be an optical sensor that emits a light beam of a certain wavelength and determines the deposition thickness of the sludge by measuring the intensity of the light beam absorption and scattering, which will not be described in detail here.

[0059] Specifically, the height interval of the mud outlet 6 can be set by those skilled in the art according to the content of the sewage carried in the denitrification tank 5. Preferably, when the content of the sewage carried in the denitrification tank 5 is 120 m 3 When, the height interval can be 15cm.

[0060] The tray module includes a tray 7 disposed at the bottom of the denitrification tank 5 and a movable supporting mechanism 8 connected to the bottom of the tray 7 for changing the tilt angle of the tray 7;

[0061] Specifically, the present invention does not limit the specific structure of the movable support mechanism 8. Preferably, it can be an electric push rod, which is widely used in industrial automation, transportation, agricultural machinery and other industries. This is the prior art and will not be repeated here.

[0062] A pre-analysis unit, which is connected to the nitrification unit and is used to calculate the water body characteristic value according to the water body transmittance at different heights under different aeration states of the aeration mechanism 3 to determine whether the water impurities have property characteristics;

[0063] Specifically, the present invention does not limit the specific structure of the pre-analysis unit. Preferably, it can be constructed using logic components, which can be microprocessors and processors used in computers, etc., and the water body characteristic characterization value is obtained to determine whether the water impurities have property characteristics, which will not be repeated here.

[0064] The intelligent regulating unit is connected to the denitrification unit and the pre-analysis unit respectively, and is used to determine the property classification of water impurities according to the thickness change of the sludge in the tray 7, and select the treatment method of the sludge in the tray 7 according to the property classification, including:

[0065] Adjusting the opening and closing states of a plurality of mud discharge ports in the denitrification pool 5 according to the water body characteristic representation value;

[0066] Or, the tray tilt angle is adjusted according to the thickness change of the sludge in the tray 7.

[0067] Specifically, the present invention does not limit the specific structure of the intelligent regulating unit. Preferably, it can be a microprocessor, which determines the property classification of water impurities according to the changes in the sludge in the tray 7, and selects the treatment method of the sludge in the tray 7 according to the property classification, which will not be repeated here.

[0068] Specifically, the denitrification tank 5 further includes a water inlet 4 arranged on the side wall of the denitrification tank for introducing the water in the nitrification tank 1 , and a drain outlet 9 arranged on the side wall of the denitrification tank for discharging the water that has completed the denitrification reaction.

[0069] Specifically, the pre-analysis unit is used to obtain water body characteristic representation values, wherein:

[0070] The pre-analysis unit calculates the maximum transmittance difference of water body transmittance at different heights under a preset first aeration amount, calculates the maximum transmittance difference of water body transmittance at different heights under a preset second aeration amount, and determines the absolute value of the difference between the maximum transmittance difference under the first aeration amount and the maximum transmittance difference under the second aeration amount as the water body characteristic characterization value.

[0071] Specifically, the preset first aeration volume can be set by those skilled in the art according to the actual temperature during sewage treatment. When the water temperature is low, the activity of nitrifying bacteria decreases and the nitrification reaction rate slows down. At this time, the aeration volume needs to be appropriately increased. Preferably, in winter when the water temperature is lower than 10°C, the first aeration volume can be 1.3m 3 / h, the second aeration volume can be 1.5m 3 / h.

[0072] Specifically, see Figure 3As shown, it is a logic flow chart of the pre-analysis unit of an embodiment of the present invention for determining whether water impurities have property characteristics. The pre-analysis unit is used to determine whether water impurities have property characteristics, wherein:

[0073] If the water body undergoing denitrification reaction meets the impurity stability condition, the pre-analysis unit determines that the water impurities in the water body do not have property characteristics;

[0074] If the water body undergoing denitrification reaction does not meet the impurity stability condition, the pre-analysis unit determines that the water impurities in the water body have property characteristics;

[0075] Among them, the impurity stability condition is that the water body characteristic representation value corresponding to the water body does not exceed a preset transmittance threshold.

[0076] Specifically, the preset transmittance threshold can be set by technicians in this field according to the source of sewage actually being treated. Preferably, when the source of sewage is domestic sewage, the transmittance threshold can be 25%.

[0077] Specifically, the present invention obtains a water body characteristic representation value according to the water body transmittance at different heights under different aeration states of the aeration mechanism through a pre-analysis unit to determine whether the water impurities have property characteristics. It can be understood that in the sewage treatment process, the impurities in the sewage water body may contain various solid sludges and flocculent sludges, and the state of the water body can be obtained through the water body transmittance. Under the first aeration amount condition, the water body transmittance is measured at different heights by the transmittance detection module, and the maximum transmittance difference of the water body transmittance at different heights is calculated, which can reflect the flocculent sludge and granular sludge in the water body. The distribution of granular sludge, while under the condition of enhanced aeration, more flocculent sludge will be redistributed, thus affecting the transmittance of the water body. The maximum transmittance difference of the water body at different heights calculated under the second aeration amount can characterize the distribution of flocculent sludge and granular sludge after the stability of water impurities changes. By calculating the absolute value of the maximum transmittance difference under different aeration conditions, the distribution of flocculent sludge in the water body can be more accurately judged, and then, the distribution of water impurities is quantified, which improves the release efficiency of internal carbon sources in sewage and the efficiency of sewage denitrification.

[0078] Specifically, the thickness measurement module is used to obtain the thickness change of the sludge in the tray 7, wherein:

[0079] The thickness measurement module obtains the thickness value of the sludge in the tray 7 in real time, and draws a sludge thickness value variation curve showing the thickness value varying with time, wherein the sludge thickness value variation curve takes time as the horizontal axis and the thickness value as the vertical axis.

[0080] Specifically, the present invention draws a sludge thickness value change curve of the sludge in the tray corresponding to the water impurities with property characteristics through the thickness measurement module. It can be understood that in sewage, there is a significant difference in the settling speed of granular sludge and flocculent sludge. The granular sludge has a large mass and is significantly affected by gravity, and has a fast settling speed. In the initial stage of sedimentation, the granular sludge in the water body will quickly settle into the tray under the action of gravity, while the flocculent sludge has a relatively slow sedimentation speed due to its small particles, irregular shape and possible colloidal properties. The difference in sedimentation speed of different types of sludge causes the growth rate of sludge thickness to change. By drawing a curve of the change of the sludge thickness value in the tray over time, the change of the sedimentation state of the water impurities can be intuitively obtained. Furthermore, by drawing a curve of the change of the sludge thickness value, the change of the sedimentation state of the water impurities is quantified.

[0081] Specifically, the intelligent adjustment unit is used to determine the properties of the water impurities to distinguish categories, wherein:

[0082] The intelligent adjustment unit determines the points whose slopes do not exceed a preset slope threshold as sludge change characteristic points according to the slopes of several points on the sludge thickness value change curve, and determines the sludge change characteristic duration according to the horizontal coordinate values ​​corresponding to the sludge change characteristic points;

[0083] If the thickness change of the sludge in the tray 7 meets the property differentiation performance condition, the intelligent adjustment unit determines that the water impurities are a strongly dominant category for property differentiation;

[0084] If the thickness change of the sludge in the tray 7 does not meet the property differentiation performance condition, the intelligent adjustment unit determines that the water impurities are a weakly dominant category for property differentiation.

[0085] Specifically, the preset slope threshold may be set by those skilled in the art based on an average value of several experimental data. Preferably, the slope threshold may be 0.6.

[0086] Specifically, the property differentiation performance condition is that the ratio of the characteristic duration of the sludge change to the preset total sludge deposition duration does not exceed a preset ratio threshold.

[0087] Specifically, the pre-set total sludge deposition time can be set by technicians in this field according to the source of sewage actually being treated. Preferably, when the sewage source is domestic sewage, the total sludge deposition time can be 3 hours.

[0088] Specifically, the preset ratio threshold value may be set by those skilled in the art based on the source of the sewage actually being treated. Preferably, when the source of the sewage is domestic sewage, the ratio threshold value may be 0.3.

[0089] Specifically, the present invention determines the properties of water impurities according to the slopes of several points on the sludge thickness value change curve and the proportion of the sludge change characteristic time by an intelligent adjustment unit. It can be understood that the accumulation rate of granular sludge is faster when it settles and accumulates, and the slope value of the sludge thickness value change curve is larger. After the granular sludge is settled, the flocculent sludge settles and accumulates more slowly, which is reflected in the smaller corresponding slope value on the sludge thickness value change curve. When the slope value of a data point on the sludge thickness value change curve does not exceed the preset slope threshold, it indicates that the granular sludge in the water body has been completed at the current moment corresponding to the data point. During sedimentation, part of the flocculent sludge is still in the process of slow sedimentation. The present invention calculates the proportion of the time taken for granular sludge to complete sedimentation in the total sedimentation time to intuitively characterize the properties of impurities in the water body and distinguish the categories. The greater the proportion of the time taken for granular sludge to complete sedimentation in the total sedimentation time, the more granular sludge there is in the impurities in the water body; the smaller the proportion of the time taken for granular sludge to complete sedimentation in the total sedimentation time, the less granular sludge there is in the impurities in the water body. Furthermore, the properties of water impurities can be classified according to the actual situation of sewage, thereby improving the release efficiency of internal carbon sources in sewage and the efficiency of sewage denitrification.

[0090] Specifically, see Figure 4 As shown, it is a logic flow chart of the intelligent adjustment unit in the embodiment of the present invention for selecting the treatment method of the sludge in the tray, wherein the intelligent adjustment unit is used to select the treatment method of the sludge in the tray 7, wherein:

[0091] If the property distinction category is a strong dominant property distinction category, the intelligent adjustment unit selects to adjust the opening and closing states of a plurality of mud discharge ports in the denitrification pool 5 according to the water body characteristic representation value;

[0092] If the property distinction category is a weakly dominant property distinction category, the intelligent adjustment unit selects to adjust the tray tilt angle according to the thickness change of the sludge in the tray 7.

[0093] Specifically, under the condition that the composition category is a strongly dominant category for trait differentiation, the present invention adjusts the opening and closing states of several sludge outlets in the denitrification pool according to the water body characteristic characterization value. It can be understood that in the denitrification process, denitrifying bacteria need energy to drive the reduction of nitrate nitrogen or nitrite nitrogen to nitrogen gas for sewage denitrification. The organic carbon source contained in the sewage itself, such as biodegradable organic matter such as sugars, proteins and fats, is an important energy source for denitrifying bacteria. The presence of a large amount of flocculent sludge in water impurities will wrap up the denitrifying bacteria, making it difficult for the bacteria to obtain the carbon source in the surrounding water, hindering the contact between the denitrifying bacteria and the organic carbon source. In the case of a tight structure, the carbon source material may be wrapped inside the flocs, and the external denitrifying bacteria cannot access these carbon sources, thereby reducing the utilization efficiency of the carbon source. Under the condition that the composition category is a strong dominant category for property distinction, it is characterized that there are more flocculent sludge in the water body impurities. The present invention adjusts the opening and closing states of several sludge discharge ports in the denitrification tank through the water body characteristic characterization value, and discharges a large amount of accumulated flocculent sludge from the denitrification tank in time, thereby preventing the denitrifying bacteria from being disturbed by the flocculent sludge and being unable to effectively utilize the organic carbon source. Furthermore, the adaptive adjustment of the sludge treatment method in the sewage is achieved, and the release efficiency of the internal carbon source in the sewage and the efficiency of sewage denitrification are improved.

[0094] Specifically, under the condition of weakly dominant category of property distinction, the present invention adjusts the tray tilt angle according to the change of sludge in the tray. It can be understood that under the condition of weakly dominant category of property distinction, there is less flocculent sludge in the water impurities, and most of the water impurities are granular sludge deposited in the tray. The present invention avoids the obstruction of flocculent sludge on the contact between the carbon source in the granular sludge and the external denitrifying bacteria by adjusting the tray tilt angle, increases the contact area between the carbon source in the granular sludge and the external denitrifying bacteria, and further realizes the adaptive adjustment of the sludge treatment method in the sewage, thereby improving the release efficiency of the internal carbon source in the sewage and the efficiency of sewage denitrification.

[0095] Specifically, the intelligent adjustment unit is used to adjust the opening and closing states of several mud discharge ports in the denitrification tank 5, wherein:

[0096] The number of the mud discharge ports 6 that remain in the open state is positively correlated with the water body characteristic characterization value, and the mud discharge ports 6 are opened in sequence from the mud discharge ports close to the bottom of the denitrification tank 5 upwards.

[0097] Specifically, the present invention adjusts the number of sludge outlets to remain in an open state and is positively correlated with the water body characteristic characterization value. It can be understood that the larger the water body characteristic characterization value, the greater the content of flocculent sludge in the water body impurities, the greater the obstacle to the contact between denitrifying bacteria and organic carbon sources, and the more necessary it is to discharge the flocculent sludge quickly. The present invention opens the sludge outlets from bottom to top near the bottom of the denitrification tank to quickly discharge the flocculent sludge. The greater the content of flocculent sludge, the more sludge outlets are opened and the faster the sludge discharge rate, thereby improving the release efficiency of the internal carbon source in the sewage and the efficiency of sewage denitrification.

[0098] Specifically, the tray tilt angle is negatively correlated with the ratio of the characteristic duration of sludge change to the preset total duration of sludge deposition.

[0099] Specifically, the tilting direction of the tray 7 is the direction of the mud discharge port, and the tray 7 may be a circular tray.

[0100] Specifically, the inclination angle of the tray of the present invention is negatively correlated with the ratio of the characteristic duration of sludge change to the preset total sludge deposition duration. It can be understood that when the flocculent sludge is less, the movable support mechanism only needs to adjust a smaller deflection angle to adjust the tray, thereby increasing the contact area between the carbon source in the granular sludge and the external denitrifying bacteria, and reducing the obstruction of the flocculent sludge to the contact between the carbon source in the granular sludge and the external denitrifying bacteria. The smaller the ratio, the more flocculent sludge, and the larger the deflection angle the movable support mechanism needs to adjust to adjust the inclination angle of the tray, so as to increase the contact area between the carbon source in the granular sludge and the external denitrifying bacteria, avoid the obstruction of the flocculent sludge to the contact between the carbon source in the granular sludge and the external denitrifying bacteria, thereby improving the release efficiency of the internal carbon source in the sewage and the efficiency of sewage denitrification.

[0101] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0102] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An intelligent sewage treatment system, characterized in that: include: The nitrification unit includes a nitrification tank for nitrifying sewage, an aeration mechanism arranged at the bottom of the nitrification tank for introducing air, and a plurality of light transmission detection modules arranged at preset height intervals on the side wall of the nitrification tank for obtaining the light transmittance of the water body; A denitrification unit, which is connected to the nitrification unit, comprises a denitrification tank for carrying out a denitrification reaction on the water body that has completed the nitrification reaction, a tray module arranged at the bottom of the denitrification tank for receiving sludge, a thickness measurement module arranged at the side wall of the denitrification tank for obtaining the thickness of the sludge, and a plurality of sludge discharge ports arranged at the side wall of the denitrification tank for discharging the sludge; The tray module comprises a tray arranged at the bottom of the denitrification tank and a movable supporting mechanism arranged at the bottom of the tray for changing the inclination angle of the tray; The thickness measurement module obtains the thickness value of the sludge in the tray in real time, and draws a sludge thickness value change curve showing the thickness value changing with time, wherein the sludge thickness value change curve takes time as the horizontal axis and the thickness value as the vertical axis; A pre-analysis unit connected to the nitrification unit is used to calculate the water body characteristic value according to the water body transmittance at different heights under different aeration states of the aeration mechanism to determine whether the water impurities have property characteristics; The pre-analysis unit calculates the maximum transmittance difference of water body transmittance at different heights under a preset first aeration amount, calculates the maximum transmittance difference of water body transmittance at different heights under a preset second aeration amount, and determines the absolute value of the difference between the maximum transmittance difference under the first aeration amount and the maximum transmittance difference under the second aeration amount as the water body characteristic representation value; The intelligent regulating unit is connected to the denitrification unit and the pre-analysis unit respectively, and is used to determine the property classification of water impurities according to the thickness change of the sludge in the tray, and select the treatment method of the sludge in the tray according to the property classification, including: adjusting the opening and closing states of a plurality of mud discharge ports in the denitrification pool according to the water body characteristic representation value; Or, adjust the tray tilt angle according to the thickness change of the sludge in the tray; The intelligent adjustment unit determines the points whose slopes do not exceed a preset slope threshold as sludge change characteristic points according to the slopes of several points on the sludge thickness value change curve, and determines the sludge change characteristic duration according to the horizontal coordinate values ​​corresponding to the sludge change characteristic points; If the thickness change of the sludge in the tray meets the property differentiation expression condition, the intelligent adjustment unit determines that the water impurities are a strongly dominant category for property differentiation; If the thickness change of the sludge in the tray does not meet the property differentiation performance condition, the intelligent adjustment unit determines that the water impurities are a weakly dominant category for property differentiation; The property differentiation performance condition is that the ratio of the characteristic duration of the sludge change to the preset total duration of sludge deposition does not exceed a preset ratio threshold; If the trait distinction category is a strongly dominant trait distinction category, the intelligent adjustment unit selects to adjust the opening and closing states of a plurality of mud discharge ports in the denitrification pool according to the water body characteristic representation value; If the property distinction category is a weakly dominant property distinction category, the intelligent adjustment unit selects to adjust the tray tilt angle according to the thickness change of the sludge in the tray.

2. The intelligent sewage treatment system according to claim 1 is characterized in that: The denitrification tank further comprises a water inlet arranged on the side wall of the denitrification tank for introducing the water in the nitrification tank, and a drain outlet arranged on the side wall of the denitrification tank for discharging the water after the denitrification reaction is completed.

3. The intelligent sewage treatment system according to claim 1 is characterized in that: The pre-analysis unit is used to determine whether the water impurities have property characteristics, wherein: If the water body undergoing denitrification reaction does not meet the impurity stability condition, the pre-analysis unit determines that the water impurities in the water body have property characteristics; Among them, the impurity stability condition is that the water body characteristic representation value corresponding to the water body does not exceed a preset transmittance threshold.

4. The intelligent sewage treatment system according to claim 1 is characterized in that: The intelligent adjustment unit is used to adjust the opening and closing states of several mud discharge ports in the denitrification tank, wherein: The number of the mud discharge ports that remain in an open state is positively correlated with the water body characteristic characterization value, and the mud discharge ports are opened in sequence from the mud discharge port near the bottom of the denitrification tank upwards.

5. The intelligent sewage treatment system according to claim 4 is characterized in that: The tray tilt angle is negatively correlated with the ratio of the sludge change characteristic duration to the preset sludge deposition total duration.

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