56 results about "Sludge bulking" patented technology

The invention relates to the field of environmental engineering and technology, and discloses a coprocessing method for coking wastewater based on MBR (membrane bioreactor) technology, which sequentially comprises the steps of pretreatment, biological enhancement treatment, nitrogen and phosphorus removal treatment, sludge regulation and control treatment, membrane pollution control treatment and circular treatment, and comprises the following steps: introducing coking wastewater into a grating and a grit chamber; performing pretreatment to remove large-particle impurities; in the biological enhancement and nitrogen and phosphorus removal stage, a microbial agent is added to regulate and control the reaction environment so as to improve the pollutant degradation efficiency; accurate management and control of sludge performance and membrane pollution are realized by using an online monitoring technology; finally, sludge, cleaning wastewater and the like generated in all links are collected in a classified mode, the sludge is subjected to resource utilization after stabilization treatment, the cleaning wastewater is reused in the pretreatment stage, and a closed-loop treatment system is formed; through the steps, the problems of incomplete removal of COD (Chemical Oxygen Demand) and ammonia nitrogen, low removal rate of total nitrogen and total phosphorus, sludge bulking, fast membrane pollution and high risk of secondary pollution in the traditional process are effectively solved.

The invention provides a method for inhibiting sludge bulking through hypoxia-anoxic intermittent aeration. The method comprises the following steps: inoculating activated sludge into a sequencing batch reactor, introducing sewage to be treated, mixing, and carrying out intermittent aeration treatment; wherein the intermittent aeration treatment comprises at least one cycle formed by alternation of a low-oxygen treatment time period and an anoxic treatment time period; and in the low-oxygen treatment period, the dissolved oxygen concentration in the reactor is controlled to be higher than that in the anoxic treatment period through aeration. According to the method, through low-oxygen-oxygen-deficiency alternate environment regulation and control, efficient nitrification and denitrification are achieved, meanwhile, filamentous bacterium growth is selectively inhibited, flora structure optimization is promoted, the sludge settling performance is rapidly recovered, the system denitrification efficiency is improved, and the method has the advantages of being simple in process, environmentally friendly and low in operation cost.

The utility model relates to the technical field of wastewater treatment and reuse, and discloses a power plant sludge drying condensation wastewater treatment and reuse system, which comprises an adjusting tank, a heat exchanger, an air flotation machine, a hydrolysis acidification tank, at least one A / O unit and a flocculation sedimentation tank which are sequentially arranged along the wastewater flowing direction, each A / O unit comprises an A / O reaction tank and a sedimentation tank, the A / O reaction tank comprises an anoxic tank and an aerobic tank, the anoxic tank, the aerobic tank and the sedimentation tank are sequentially arranged along the flowing direction of wastewater, and filler for attachment of microorganisms is arranged in the aerobic tank. According to the system provided by the utility model, an A / O method and a biological contact oxidation method are combined together, so that the process treatment capacity is large, the sludge generation amount is small, sludge bulking cannot be generated in the operation process, the stability of the effluent quality can be ensured, the one-time investment and the operation cost can be reduced, and the occupied area is reduced; the system can effectively remove suspended matters, COD (Chemical Oxygen Demand), ammonia nitrogen, total phosphorus and the like in the sludge drying and condensing wastewater, and effluent reaching the standard can be recycled to a power plant.

The invention relates to the technical field of chemical wastewater treatment, and particularly discloses a comprehensive treatment method of sulfur-containing waste alkali, which comprises the following steps: S1, a pretreatment step: storing sulfur-containing waste alkali liquor in an adjusting and homogenizing tank for homogenizing treatment, and then pumping the sulfur-containing waste alkali liquor to a deoiling and diluting tank for standing separation to remove oil and solid impurities; s2, a wet oxidation (WO) step: pressurizing the pretreated waste alkali liquor to 60 bar through a booster pump, mixing the pretreated waste alkali liquor with compressed air with the flow of 230 Nm < 3 > / h, heating the mixture to 178 DEG C through a preheater, enabling the mixture to enter a reactor, carrying out oxidation reaction under the conditions of 200-240 DEG C and 3-5 barg for 30-60 minutes, cooling a reaction product, and enabling the cooled reaction product to enter a gas-liquid separator for separation; through the effects of wet oxidation, evaporative crystallization and chemical oxidation, organic matters and sulfides in the sulfur-containing waste alkali liquor can be efficiently degraded, the COD removal rate is remarkably increased, meanwhile, the common problems of sludge bulking, water quality fluctuation sensitivity and the like in traditional biological treatment are avoided, and the stability and reliability of the treatment process are ensured.

The present application relates to the field of sewage treatment, in particular to a method for solving sludge bulking of sewage treatment system in winter, comprising the following steps: 1, judging the cause of sludge bulking, detecting the sewage index, activated sludge index and reclaimed water quality index, and judging the degree of sludge bulking; 2, sludge bulking treatment, intermittent aeration and oxygenation according to the degree of sludge bulking, adding O3 to kill part of filamentous bacteria, adding wood ash, accelerant and organic biological complexing agent, increasing the adhesion of activated sludge and the number of microorganisms; 3, discharge activation, using a small low-voltage discharge device, passing a small current into the sewage tank, and exciting microbial activity through the current; 4, intermittent pumping of sewage, the step comprising starting the sewage pump, intermittent pumping of sewage, until the activated sludge settling ratio of the aerobic tank is greater than 40%. The present application has the advantages of simple operation, low investment and stable effect, and can solve the problem of sludge bulking of the sewage treatment system in a short time.

The present application provides a sludge bulking inhibition method based on soft constraint model predictive control, which adjusts the control strategy according to the cause variable of sludge bulking, so as to track the dissolved oxygen concentration and nitrate nitrogen concentration to the expected value and realize the inhibition of sludge bulking. The present application designs a sludge bulking intelligent diagnosis algorithm, calculates the relative reconstruction contribution, diagnoses the cause variable of sludge bulking, designs a soft constraint model predictive control strategy, guides the priority order of the controlled target according to the cause variable, softens the strict output constraint by using the slack variable, and obtains the control law by sequentially optimizing the controlled target. The experimental results show that the method can effectively inhibit the sludge bulking in the urban sewage treatment process.

The present application relates to a kind of sludge grading backflow denitrification and phosphorus removal process and device suitable for municipal wastewater, comprising the following steps: active sludge and raw water are introduced into anaerobic zone one simultaneously by water inlet pipe, forming mixed liquor;The mixed liquor is lifted to anaerobic zone two using variable frequency booster pump, and further mixed reaction is carried out by stirrer;The mixed liquor treated after anaerobic zone two is introduced into transition zone, and denitrification reaction is strengthened;Make mixed liquor into aerobic zone, carry out nitrification and partial simultaneous denitrification reaction, then carry out screening treatment by cyclone screen, the heavy density sludge separated is backflowed to anaerobic zone one by pre-sedimentation backflow pipe, and the remaining sludge is transported to secondary sedimentation tank for sedimentation treatment, and part of the sludge after sedimentation treatment is backflowed to transition zone by external backflow pipe.Compared with prior art, the present application realizes the continuous gravity screening of sludge system denitrification and phosphorus removal sludge and the optimal allocation of carbon source, effectively controls sludge bulking, and improves sludge concentration and system processing efficiency.

The invention discloses a sludge settling performance intelligent diagnosis and early warning system and method based on full-automatic visual analysis, and relates to the technical field of sewage treatment. The system comprises an imaging unit, a laser calibration unit, an image processing module, an image segmentation and tracking module, a data analysis unit and an ultrasonic cleaning device. The method comprises the steps of sampling, laser calibration and image acquisition, preprocessing, segmentation tracking, parameter calculation, early warning and cleaning. According to the method, a pixel millimeter mapping relation is established through 635nm laser calibration, UNet segmentation and an LSTM prediction model are combined, online MLSS data are fused, high-precision interface tracking is realized, Vs, Cc, dynamic SVIt and other parameters are output in real time, and the early warning accuracy is improved 2-6 hours before sludge bulking / disintegration. According to the scheme, the problems that traditional manual detection is large in error and high in hysteresis quality and an existing visual scheme is low in precision are solved, the measurement efficiency is improved, and the method is suitable for AAO, MBR and other processes.

The utility model provides an anaerobic bioreactor, it includes reactor shell, inlet pipe, inlet main, nitrogen pipe, circulating water pipe and outlet pipe, the reactor shell is equipped with water distribution pipe, circulating water collecting pipe and three -phase separator from below to above in proper order, the top of reactor shell is equipped with marsh gas pipe, two ends of water distribution pipe are connected with two inlet main respectively, water distribution pipe includes a plurality of side -by -side arrangement's perforated pipe, the side of perforated pipe is equipped with obliquely downward water distribution hole, inlet main with inlet pipe, circulating water pipe, nitrogen pipe intercommunication, nitrogen control valve is equipped on nitrogen pipe, inlet control valve is equipped respectively between inlet pipe and two inlet main, circulating water collecting pipe with circulating water pipe intercommunication, the upper portion of three -phase separator with outlet pipe intercommunication. The technical scheme of the present application increases sludge expansion effect, has improved the mass transfer effect in the reactor, has avoided water distribution pipe blockage, and the processing efficiency is high.

The utility model discloses sludge bulking prevention equipment for an oxidation ditch, which belongs to the technical field of oxidation ditch equipment and particularly comprises an oxidation ditch, an aeration component and a clearing component, the removing assembly comprises an alkaline assembly which is arranged below the oxidation groove and is connected with the oxidation groove through a pipeline, and a scraping assembly which swings in the oxidation groove is arranged above the injection end of the alkaline assembly; the aeration assembly comprises a fixing rod which is arranged above the scraping assembly and is in the horizontal transverse direction, the surface of the fixing rod is sleeved with a plurality of fixing rings, the upper ends and the lower ends of the fixing rings are rotationally connected with rotating rods in the direction perpendicular to the fixing rod, and one end of each rotating rod is rotationally connected with a sleeve plate; the rotating end of the sleeve plate is rotatably connected with a push plate, one end of the push plate is fixedly connected with a double-acting air cylinder, and the surface of the rotating rod is rotatably connected with a swing blade. The swing type sludge water body aeration device can swing sludge water body aeration, improve the sludge treatment effect, and meanwhile can alkalify to reduce sludge formation and prevent sludge bulking.

The invention discloses a method for recovering filamentous bacterial expansion of moderately halophilic aerobic granular sludge, and belongs to the technical field of high-salinity wastewater treatment. The method aims at the problem of sludge bulking caused by the fact that filamentous bacteria and lactic acid producing bacteria Halolacbacillus sp. Grow synergistically in a high-salt environment, and the Halolacbacillus sp. Secretes lactic acid to induce overgrowth of the filamentous bacteria, and the rapid proliferation of fungi is promoted by controllably reducing the salinity of a system. Fungus hyphae extend in the particles to form an oxygen conveying channel, the anaerobic area is improved, the living space of the Halolabacillussp. Is compressed, and lactic acid supply of filamentous bacteria is cut off to inhibit growth of the filamentous bacteria. In this way, the structure of the moderately halophilic aerobic granular sludge with filamentous bacterial expansion can be recovered and strengthened in a short time. The method is a non-toxic, low-cost, simple-to-operate, safe, efficient, stable and reliable regulation and control mode.

The present application belongs to the technical field of sewage treatment, and particularly relates to a treatment system and method for sludge bulking caused by filamentous bacteria. The method comprises: performing starvation operation on a sewage biological treatment system in which filamentous bacteria bulking occurs, wherein the starvation operation is to stop or reduce the supply of organic carbon, nitrogen and phosphorus to the sewage biological treatment system; and after the starvation operation, performing supplemental nitrate water feeding on the sewage biological treatment system, wherein the supplemental nitrate water feeding comprises: resuming the supply of water containing an organic carbon source to the sewage biological treatment system, while increasing the concentration of nitrate nitrogen in the water. Through two-stage regulation of “starvation operation + nitrate supplement”, the present application precisely utilizes the metabolic disadvantage of filamentous bacteria under low substrate conditions and the sensitivity of filamentous bacteria to a nitrate environment, so as to selectively inhibit the growth of filamentous bacteria and quickly restore the settling performance of the reactor in a short period of time.

The invention relates to a method and system for treating high-ammonia-nitrogen organic wastewater by coupling carbon capture with anaerobic ammonia oxidation, and the method comprises the following steps: inhibiting the growth of sludge bulking microorganisms in wastewater by utilizing the alternation of an anaerobic environment and an aerobic environment, and removing ammonia-oxidizing microorganisms in the wastewater by controlling the retention time of the wastewater in the anaerobic environment and the aerobic environment. The method comprises the following steps: screening and domesticating sludge carbon entrapped microorganisms, and promoting rapid metabolism and proliferation of the carbon entrapped microorganisms by utilizing an aerobic environment, so that organic matters in wastewater are rapidly captured, sludge is discharged, carbon and nitrogen separation of the wastewater is realized, high-ammonia-nitrogen low-carbon effluent is obtained, anaerobic ammonia oxidation treatment denitrification is performed on the high-ammonia-nitrogen low-carbon effluent, and the high-ammonia-nitrogen low-carbon effluent is obtained. And low-ammonia-nitrogen low-carbon effluent is obtained. The system comprises an ammonia protection and carbon interception unit and an anaerobic ammonia oxidation unit. According to the method, carbon and nitrogen in the high-ammonia-nitrogen organic wastewater can be effectively separated, the separated carbon and nitrogen are treated respectively, and on the premise that carbon and nitrogen in the wastewater are efficiently removed, resource utilization of carbon is achieved.

The application discloses a kind of early warning device and method of sludge bulking in early stage of SBR reactor based on computer vision.The device uses double visual angle to carry out real-time monitoring to activated sludge of each operation cycle of SBR reactor, one is through collecting sludge apparent image of SBR reactor, the early characteristics of sludge bulking are extracted, then early warning model of sludge bulking in early stage is used to judge the running state of reactor;Another is to collect sludge settling image of SBR reactor in the sedimentation stage, automatically generate sludge settling curve and sludge settling rate curve and carry out information extraction, and then judge the settling performance of sludge in SBR reactor, and alarm sludge bulking soon.This method combines sludge apparent image and settling image information, comprehensively analyzes the early characteristics of sludge bulking, reduces misjudgment, improves recognition accuracy, solves the problems of sewage plant sludge bulking phenomenon burst, high subsequent control cost, long recovery time and the like.

The present invention relates to the technical field of sewage treatment, and in particular to a method for biological phosphorus removal from wastewater using anoxic starvation treatment. The method performs sludge acclimation on a mixture of activated sludge and wastewater to be treated, and then performs anoxic starvation treatment; wherein the activated sludge contains fermentative polyphosphate bacteria, and before the sludge acclimation is performed, the initial abundance of the fermentative polyphosphate bacteria is 0.5%-1.5%, and during the anoxic starvation treatment, a solution containing nitrite nitrogen is used to soak the mixture of the activated sludge and wastewater to be treated. The method increases the abundance of fermentative polyphosphate bacteria and suppresses the proliferation of filamentous bacteria through anoxic starvation treatment, thereby effectively suppressing sludge swelling. The high abundance of fermentative polyphosphate bacteria can promote the performance of the biological phosphorus removal system and improve the sewage treatment effect.

The utility model relates to the technical field of wastewater treatment, and discloses a system for treating and recycling high-ammonia-nitrogen sludge drying condensation wastewater in a power plant, which comprises an adjusting tank, a heat exchanger, an air flotation machine, a hydrolysis acidification tank, an A / O unit, a denitrification biological filter and a flocculation sedimentation tank which are sequentially connected along the flowing direction of the wastewater, the A / O unit comprises an A / O reaction tank and a sedimentation tank, the A / O reaction tank comprises an anoxic tank and an aerobic tank, the anoxic tank, the aerobic tank and the sedimentation tank are sequentially arranged along the flowing direction of the wastewater, and a filler for attachment of microorganisms is arranged in the aerobic tank. According to the system provided by the utility model, an A / O method and a biological contact oxidation method are combined together, so that the process treatment capacity is large, the sludge generation amount is small, sludge bulking cannot be generated in the operation process, the stability of the effluent quality can be ensured, and the operation cost can be reduced; the system can effectively remove suspended matters, COD (Chemical Oxygen Demand), ammonia nitrogen, total phosphorus and the like in the sludge drying and condensing wastewater, and is particularly suitable for treating high-ammonia-nitrogen sludge drying and condensing wastewater.

The present invention relates to the technical field of sewage treatment, and specifically to a method for evaluating the settling performance of activated sludge and controlling sludge bulking. The method of the present invention evaluates the settling performance of activated sludge by defining a "sludge escape index" SEI, and makes corresponding process adjustments based on the evaluation results, thereby slowing down or even avoiding sludge bulking. In the method of the present invention, when the sludge is slightly expanded, the solid surface load of the secondary sedimentation tank is reasonably adjusted; when the sludge is moderately expanded, micropowder is added to aid sedimentation; when the sludge is severely expanded, additional flocculants are added to improve the sludge settling performance; when the sludge is severely expanded, emergency measures such as adding a carbon source are adopted for treatment. Through the method of the present invention, the settling performance of the sludge in the secondary sedimentation tank can be effectively evaluated, and sludge bulking can be controlled in a timely and effective manner, which is of great significance to maintaining the stable operation of the production process.

This invention discloses an adaptive limit control system and method for SBR decanter based on multi-parameter coupling, belonging to the field of intelligent control technology for wastewater treatment. Addressing the non-contact sludge runoff phenomenon of "siphon following effect" caused by sludge expansion or deterioration of settling performance during the SBR decanting stage, this invention constructs a dual closed-loop control architecture of multi-parameter coupling, incorporating feedforward prediction and feedback self-learning. The system comprises a multi-parameter sensing module, a multi-parameter coupled modeling and control unit, an execution module, and a feedback correction module. By integrating multi-dimensional information such as online MLSS, temperature, real-time sludge level from the sludge interface meter, online effluent SS / TP monitoring, and laboratory SV30 / SVI data and their input timeliness, it establishes a "sedimentation risk-safety margin" mapping model expressed as a product of the sedimentation expansion coefficient k₁, activity inhibition coefficient k₂, density compensation coefficient k₃, and time-related decay coefficient k₄. This model dynamically generates a safety redundancy distance ΔS, and outputs the optimal lower limit Hopt = L + ΔS, pre-setting the limit before decanting begins, thus achieving a fundamental shift from reactive emergency shutdown to proactive prevention. The feedback correction module continuously corrects model parameters through automatic attribution judgment and trial-and-error optimization algorithms, maximizing the single-cycle treatment capacity while ensuring effluent compliance. This invention is the first to achieve proactive control of the siphon following effect, significantly improving the effluent compliance rate and operating efficiency of the SBR process under complex operating conditions.

The invention relates to a method and a system for ammonia conservation and carbon interception of high-ammonia-nitrogen organic sewage, and the method comprises the following steps: utilizing the alternation of an anaerobic environment and an aerobic environment to inhibit the growth of sludge bulking microorganisms in the sewage, and controlling the retention time of the sewage in the anaerobic environment and the aerobic environment to remove ammoxidation microorganisms in the sewage, so as to realize the ammonia conservation and carbon interception of the high-ammonia-nitrogen organic sewage. The method realizes screening and domestication of sludge carbon entrapped microorganisms, promotes rapid metabolism and proliferation of the carbon entrapped microorganisms by using an aerobic environment, rapidly captures and discharges organic matters in sewage through high organic matter adsorption capacity, rapid metabolism and proliferation of the carbon entrapped microorganisms, obtains high-ammonia-nitrogen low-carbon effluent, and realizes carbon-nitrogen separation of the sewage. The system comprises an anaerobic selection tank, an aerobic carbon interception tank and a sedimentation tank which are connected in sequence, a part of mud-water mixture in the aerobic carbon interception tank and a part of sludge in the sedimentation tank flow back to the anaerobic selection tank, and residual sludge in the sedimentation tank is discharged. The method can realize effective carbon and nitrogen separation of the high-ammonia-nitrogen organic sewage, and is beneficial to recycling of carbon and nitrogen resources.

The present application belongs to the technical field of sewage treatment risk early warning, and discloses a method for predicting sludge bulking by integrating sludge volume and toxicity effect in a sewage treatment process, which comprises the following steps: S1. calculating RIS according to the integrated sludge biological effect index and physicochemical index; the RIS is the product of the sludge functional enzyme biological index (the ratio of the maximum effect concentration to the half effect concentration) and the physicochemical index (the ratio of the measured SVI value to the limited SVI value of sludge bulging); S2. defining the safe range of sludge bulging under the RIS according to the risk event probability statistics, and defining the success event and the failure event as RIS<2 and RIS>2 respectively; MOS=L * N max ‑(LN max ‑Z risk S * )=Z risk S * (5) wherein: S * : the standard deviation of the process index of the sewage plant; Z risk : the standard normal quantile of any specified acceptable risk level, and the value is obtained by consulting the normal distribution table; the evaluation result of the present application is high in accuracy, and to a certain extent, prevents the limitations brought by sludge bulging faced by the sewage treatment process system.

A slightly heavy particle system for wastewater treatment includes a contactor. The contactor includes a gas-liquid-solid three-phase region, and the gas-liquid-solid three-phase region includes gas phase, liquid phase, and solid phase. The liquid phase is the continuous phase and the solid phase is slightly heavy particles. The slightly heavy particles are able to carry some microorganisms on their surfaces at least, and the density of the slightly heavy particles is higher than the density of the liquid. The slightly heavy particle system applied in wastewater treatment can increase the concentration of microorganisms significantly, improve the ability to bear impact load, produce less sludge, and without sludge expansion. Meanwhile, suspending slightly heavy particles with the combined effect of gas and liquid is able to reduce energy consumption to a larger extent. Therefore, this system features with high efficiency and low energy consumption.

The invention belongs to the field of wastewater treatment, and discloses a method for inhibiting low-temperature sludge bulking by adding diatomite. The method comprises the following steps: treating sewage by adopting an activated sludge process under the condition that the water temperature is 4-15 DEG C, monitoring the settling property of the sludge during sewage treatment, adding a diatomite dispersion liquid into a biochemical reaction zone when the sludge expands, so that the concentration of the diatomite in the biochemical reaction zone is 200-400 mg / L, and after the diatomite dispersion liquid is added, adding the diatomite dispersion liquid into the biochemical reaction zone to ensure that the concentration of the diatomite in the biochemical reaction zone is 200-400 mg / L, so that the concentration of the diatomite in the biochemical reaction zone is 200-400 mg / L; the inhibition of low-temperature sludge bulking can be realized; the diatomite dispersion liquid is obtained by fully dispersing diatomite with the particle size of 2-50 microns in water. The invention provides a more economical and efficient method for controlling low-temperature sludge bulking.

The present application belongs to the field of sewage biological treatment technology, and particularly relates to a method for quickly and quantitatively regulating and controlling the sludge settling property of filamentous bacteria by using attapulgite micro-powder. The present application can quickly improve the settling performance of bulking sludge, and has the advantages of simple process, convenient operation, low operation cost and good engineering application prospect. The present application is not dependent on the identification of the type of sludge bulking, and is not affected by the sludge concentration, and is suitable for various types of bulking sludge. The attapulgite has good adaptability to different types of sludge, can significantly improve the settling performance of the sludge, and the sludge concentration is linearly related to the attapulgite dosage, which is convenient for regulation and control. The present application uses micron-sized attapulgite to improve the settling property of filamentous sludge, and the attapulgite is loaded on the bacterial filaments to realize the co-settling of the sludge and the attapulgite, effectively improve the flocculation structure of the sludge, and further improve the settling performance of the sludge.

The wine brewing wastewater conversion system provided by the utility model comprises a closed reaction zone, a filtering device and a liquid circulation system. The closed reaction zone receives wine brewing wastewater and corresponding reactants and active matters, the pH value of the wine brewing wastewater is adjusted to a proper interval, organic matters in the wine brewing wastewater are converted by using the active matters, and then the converted clear liquid is fed into the reaction zone by circularly supplementing the reactants and the active matters in an overflowing and filtering manner. Through uninterrupted circulating conversion, muddy water and sediment which are rich in carbon and nitrogen elements and can be converted by a conventional high-concentration organic biochemical treatment mode are obtained, and harmless conversion is achieved by performing conventional high-concentration organic biochemical treatment on the muddy water and sediment. The pH of the reaction bin is adjusted through hydrogen peroxide and ozone, the microbial conversion efficiency can be improved, the conversion problem of the wine brewing wastewater is solved, sludge bulking is controlled through a liquid circulation system, COD parameters of effluent are reduced, and harmless conversion is achieved.

The application discloses a method for full-load operation of an oxidation ditch system during a sludge expansion period, and the oxidation ditch system comprises a pretreatment zone, an oxidation ditch and a secondary sedimentation tank, and comprises the following steps: opening a water inlet valve of the oxidation ditch, and re-injecting sewage treated by the pretreatment zone; meanwhile, clear water in the upper layer of the oxidation ditch is discharged to the secondary sedimentation tank; the water inlet valve of the oxidation ditch is closed, all pushers in the oxidation ditch are opened, the newly-injected sewage is mixed with the original sludge-water mixture, and the mixture is circulated and flows in the oxidation ditch to perform an anaerobic reaction and release phosphates; then, an aeration system in the oxidation ditch is opened, and the sewage in the oxidation ditch is circulated to perform an aerobic-anoxic working condition; the aeration system and the pushers in the oxidation ditch are closed to perform static sedimentation; and the intermittent operation is repeated. The application controls the expanded sludge in the oxidation ditch, thereby reducing the influence of the expanded sludge on the secondary sedimentation, and enabling the oxidation ditch process to normally produce at full load during the sludge expansion period in winter.

The invention discloses a hydrolytic acidification reactor capable of controlling the height of a sludge bed and a hydrolytic acidification treatment method, and relates to the technical field of sewage treatment. The hydrolytic acidification reactor comprises a reactor main body, a central vertical shaft, a water distribution system, a control system and a water quality detection system; the central vertical shaft is vertically arranged inside the reactor main body, and the central vertical shaft is communicated with an external sewage pipeline; the water quality detection system is connected with the signal input of the control system, the water quality detection system is used for detecting COD of a water body before and after a reaction and the suspended matter concentration of a clear water area in real time, and the control system is used for receiving a signal sent by the water quality detection system and adjusting the stirring frequency and the stirring strength of the water distribution device according to the received signal; the height of the sludge bulking bed is controlled. The hydrolytic acidification reactor can dynamically adjust the height of a sludge bulking bed in the reactor so as to achieve the effects of high mass transfer, hardening prevention and strong interception.

The utility model belongs to the technical field of sewage treatment, and particularly relates to a novel milk factory wastewater treatment system. The wastewater treatment system comprises a grating, an adjusting tank, an air floatation tank, a hydrolysis acidification tank, an anoxic tank, a contact oxidation tank, a vertical flow sedimentation tank, a coagulative precipitation tank, a common rapid filter tank and a disinfection tank which are sequentially connected, the hydrolysis acidification tank, the vertical flow sedimentation tank, the coagulative precipitation tank and the common rapid filter tank are communicated with a sludge collecting well, and the sludge collecting well is sequentially communicated with a sludge concentration tank and a dehydration room. And the hydrolysis acidification pool is sequentially connected with a water-sealed tank, a buffer tank and a gas holder. The milk factory wastewater treatment system disclosed by the utility model has a good treatment effect on milk factory wastewater, and the effluent quality index meets the primary standard in Integrated Wastewater Discharge Standard. The whole process has the advantages of high high-concentration organic wastewater treatment efficiency, impact load resistance, difficulty in sludge bulking, low operation cost, good effluent quality, stable operation and low energy consumption, and is an economical and reasonable treatment system.

The utility model relates to a municipal sewage treatment system and belongs to the technical field of sewage treatment. Each group of sewage treatment line comprises a biological selection tank, an anaerobic tank, a first-stage anoxic tank, at least one first-stage aerobic tank, a second-stage anoxic tank and a second-stage aerobic tank which are communicated in sequence, the biological selection tank is connected with an incoming water main pipeline, the incoming water main pipeline is connected with an incoming water branch pipe, the middle part of the incoming water branch pipe is connected with a first branch, the first branch extends into the first-stage anoxic tank, and the second branch extends into the second-stage anoxic tank. The other end of the incoming water branch pipe is connected with a second branch, and the second branch extends into the first primary aerobic tank. A part of incoming water is introduced into a primary anoxic tank through an incoming water branch pipe and a first branch, so that a carbon source in the incoming water is fully utilized as a carbon source of a denitrification system, and the dosage of the carbon source is reduced; a part of incoming water is introduced into the first primary aerobic tank through the incoming water branch pipe and the second branch, so that the sludge load of the primary aerobic tank is improved, the sludge aging is relieved, and the sludge bulking problem is prevented.

This utility model relates to a device for solving sludge bulking, comprising a cylindrical screening chamber, a conical screening chamber, an impeller, a motor, a bell-shaped inlet, and a bushing. The motor is located on the outer front end of the cylindrical screening chamber. An inlet is located at the top of the cylindrical screening chamber, and the rear end is connected to the conical screening chamber. An impeller is located at the inner end of the cylindrical screening chamber, and the motor shaft is connected to the impeller. The bell-shaped inlet is located at the front end of the impeller, and the narrow end of the bell-shaped inlet is connected to the bushing. The bushing passes through the cylindrical screening chamber, and an overflow port is provided on the bushing on the outer side of the cylindrical screening chamber. Under the centrifugal force of the impeller, high-quality sludge enters the conical screening chamber, while low-quality sludge enters the bell-shaped inlet. This device does not rely on the addition of chemicals, nor does it require changes to the operating conditions of the biological treatment tank. The obtained high-quality sludge has a large particle size, low filamentous bacteria content, and good settling performance, thus avoiding sludge bulking and solving the sludge bulking problem caused by low-quality sludge.

The invention relates to a sludge graded reflux nitrogen and phosphorus removal process and device suitable for town sewage, and the process comprises the following steps: synchronously introducing activated sludge and raw water into an anaerobic zone I through a water inlet pipe to form a mixed solution; lifting the mixed solution to an anaerobic zone II by using a variable-frequency lifting pump, and further mixing and reacting by using a stirrer; introducing the mixed solution treated in the anaerobic zone II into a transition zone, and enhancing the denitrification reaction; enabling the mixed solution to enter an aerobic zone, carrying out nitrification and partial synchronous denitrification reaction, then carrying out screening treatment through a cyclone screener, enabling the separated heavy-density sludge to flow back to the anaerobic zone I through a pre-sedimentation return pipe, conveying the rest sludge to a secondary sedimentation tank, and carrying out sedimentation treatment; and part of the sludge subjected to precipitation treatment flows back to the transition area through an outer backflow pipe. Compared with the prior art, continuous gravity screening and carbon source optimal configuration of nitrogen and phosphorus removal sludge of a sludge system are achieved, sludge bulking is effectively controlled, and the sludge concentration and the system treatment efficiency are improved.