CN209128145U - A Novel Anaerobic-Anoxic-Aerobic Sewage Integrated Treatment System - Google Patents

Abstract

The utility model discloses a novel anaerobic-anoxic-aerobic sewage integrated treatment system, which comprises a multi-phase flow anaerobic digestion process, a multi-stage circulating aeration treatment process, a return circulation and a self-balancing treatment process, and the like. Among them, the multi-phase flow anaerobic digestion process will anaerobic fermentation of the inflow sewage and the return sludge to reduce the organic load in the system; the multi-stage circulating aeration treatment process adopts the online monitoring equipment of dissolved oxygen meter, so that the oxygen content of the aeration box is controlled within Within the range of 2 to 8 mg/L, excessive aeration and insufficient aeration are avoided, system energy consumption is reduced, and the quality of sewage treatment is improved; the reflux cycle and self-balancing treatment process adopt alternate cycles of anaerobic, anoxic and aerobic, This greatly reduces the amount of excess sludge and reduces the workload of system maintenance. The system can cope with the impact of high organic load sewage and large changes in the range of sewage flow, and is economical and efficient.

Description

A Novel Anaerobic-Anoxic-Aerobic Sewage Integrated Treatment System

technical field

The utility model belongs to the technical field of sewage treatment, in particular to a novel anaerobic-anoxic-aerobic sewage integrated treatment system.

Background technique

The particularity of railway projects makes it difficult for the sewage (feces) of railway station areas to be integrated into the municipal pipeline network, especially some small and medium-sized railway station areas. Due to their remote geographical location and long-term construction, they often need to treat station sewage by themselves. Since the convening of the 19th National Congress of the Communist Party of China, the requirements for ecological civilization construction have become higher and higher, the state's efforts to environmental protection have continued to increase, and the standards for sewage discharge along railway lines have become higher and higher. Simple and conventional treatment methods are difficult meet new emission standards.

In the sewage treatment process, not only the effective removal of biochemical oxygen demand (BOD ₅ ), but also the nitrogen (N) and phosphorus (P) to be removed should be considered. There are many sewage treatment processes that can be used at present, but the ones with better treatment effect and relatively mature technology are as follows:

SBR process: This process is an activated sludge sewage treatment technology that operates in the way of intermittent aeration, so it is also called the sequencing batch activated sludge process.

UCT process: UCT sewage treatment process is similar to the traditional A/O process. The reaction tank is composed of three parts: anaerobic tank, anoxic tank and aerobic tank. The basic principle is that sewage and phosphorus-containing return sludge enter anaerobic tank. The reaction tank releases phosphorus and absorbs part of the organic matter; in the anoxic reaction tank, the organic matter in the influent water is used as the carbon source, and the nitrate in the reflux of the mixed liquid is used for denitrification and denitrification; Further remove BOD ₅ , carry out nitrification reaction and excessive phosphorus absorption; finally, carry out mud-water separation in the sedimentation tank, so that phosphorus-rich sludge is discharged from the treatment system in the excess sludge discharge, and finally achieves the purpose of phosphorus removal.

Oxidation ditch process: Oxidation ditch is a variant of the activated sludge process. According to the continuous circulation of the mixture of wastewater and activated sludge in the oxidation channel, it is also called "circulating aeration tank" or "endless aeration system". Commonly used Carrousel (Carrousel) oxidation ditch process and ICOG (integrated oxidation ditch) process.

A ² /O process: A ² /O process is also known as anaerobic-anoxic-aerobic method, which can achieve denitrification and phosphorus removal and organic matter degradation at the same time.

Anaerobic Membrane Bioreactor (AnMBR): The research on the anaerobic membrane bioreactor process began in 1978. Grethlein used an external cross-flow filtration membrane to treat the effluent of the anaerobic biological pond and obtained good effluent quality. However, due to serious membrane fouling and high cost of membrane modules, the process developed slowly in the following 20 years. In the past 10 years, due to the rapid development of MBR technology and the significant reduction of related operating costs, AnMBR has the advantages of low energy consumption, low sludge output, and energy recovery compared with the aerobic MBR (AeMBR) process (Jiang Lanlan, Zhang Wanli, Yang Weilan, et al. Analysis of the effect of MBR process on sewage treatment and its influencing factors [J]. China Water Supply and Drainage, 2012, 28(24): 49-52), and compared with traditional anaerobic process, it has better effluent quality Therefore, related research has received more and more attention.

The sewage discharge of small and medium-sized railway stations in China has the characteristics of small water volume (1m ³ /d～500m ³ /d) and low pollutant concentration. The main pollutant indicators are COD _cr 80～550mg/L, BOD ₅ 53～240mg /L, ammonia nitrogen 10～50mg/L, SS 50～200mg/L, petroleum 5～20mg/L (Zhao Yuexia, Shui Chunyu, Hou Shiquan. Ecological pond technology for treating sewage in small and medium railway stations [J]. China Railway Science, 2006(04):133-136; Yan Yan. Research on domestic sewage treatment technology in small and medium railway stations [D]. Beijing Jiaotong University, 2011). From a technical point of view, the domestic sewage treatment in these small and medium-sized railway stations should adopt a decentralized and small-scale treatment mode according to the actual local conditions. Technically, it requires simple process, guaranteed purification effect, low investment, low energy consumption, and simple operation and maintenance. . At present, domestic sewage treatment in railway station areas is mainly based on biological treatment, including stabilization pond treatment, underground filter field treatment, oxidation ditch treatment, etc. (Yan Zhitao. Experimental research on domestic sewage land treatment technology in small and medium-sized railway stations [D]. Lanzhou Jiaotong University, 2010). However, the treatment effect of these methods is greatly affected by temperature, the growth of microorganisms and biological activities will be greatly inhibited, and the removal efficiency of pollutants will be greatly reduced. Therefore, better treatment systems and processes are urgently needed to achieve higher emission standards.

Utility model content

In view of the discharge characteristics of sewage (feces) in small and medium-sized railway stations, the increasing discharge standards, and the deficiencies in the treatment of the prior art, the purpose of this utility model is to provide a novel anaerobic-anoxic-aerobic sewage Integrated processing system.

The above-mentioned purpose of the present utility model is achieved through the following technical solutions:

A novel anaerobic-anoxic-aerobic sewage integrated treatment system, the system includes a multiphase flow anaerobic reaction tank 1, an aeration box 3, a micro-aeration box 9, a clarification box 11 provided with an ultraviolet sterilization lamp 10, The first water level control system, the second water level control system and the aeration control system, the multiphase flow anaerobic reaction tank 1 is connected with the bottom of the aeration tank 3 and the micro-aeration tank 9 to form a return water cycle, and the small and medium-sized railway station area Sewage is input into the multiphase flow anaerobic reaction tank 1 for fermentation, and the clear night after fermentation is controlled by the first water level control system to be pumped from the upper part of the multiphase flow anaerobic reaction tank 1 into the aeration tank 3 for first-level aeration, and then controlled by the first water level control system. The second water level control system controls the pump from the middle of the aeration box 3 into the micro-aeration box 9 for secondary aeration, and then outputs from the upper part of the micro-aeration box 9 into the clarification box 11 for precipitation, clarification and sterilization. The aeration box 3 and the micro-aeration box The aeration of 9 is controlled by the aeration control system.

Further, the first water level control system of the above-mentioned novel anaerobic-anoxic-aerobic sewage integrated treatment system includes a first water level gauge installed in the multiphase flow anaerobic reaction tank 1, and is connected to the multiphase flow anaerobic reaction tank. 1 and the sewage pump 2 of the aeration tank 3, when the first water level gauge detects that the water level in the multiphase flow anaerobic reaction tank 1 reaches the set high value, the sewage pump 2 automatically starts to pump water to the aeration tank 3. When the water level When it falls to the lower limit of the set value, the sewage pump 2 stops automatically.

Further, the second water level control system of the above-mentioned novel anaerobic-anoxic-aerobic sewage integrated treatment system includes a second water level gauge installed in the aeration tank 3, and a circulation connecting the aeration tank 3 and the micro-aeration tank 9. Pump 13, when the second water level gauge detects that the water level in the aeration tank 3 reaches the set high value, the circulating pump 13 automatically starts to pump water to the micro-aeration tank 9, and when the water level drops to the lower limit of the set value, the circulating pump 13 automatically starts. stop.

The first water level gauge and the second water level gauge of the utility model are independently selected from a float type water level gauge, an optical fiber water level gauge, a tracking type water level gauge, a pressure type water level gauge, a sound wave water level gauge, etc. In an embodiment of the new type, a float-type water level gauge is selected.

Further, the aeration control system of the above-mentioned novel anaerobic-anoxic-aerobic sewage integrated treatment system includes a dissolved oxygen meter 4 and an aeration fan 5, and the dissolved oxygen meter 4 monitors the oxygen content in the aeration tank 3 on-line. The oxygen concentration controls the aeration fan 5 to automatically aerate in a timely manner.

Further, the tops of the aeration box 3 and the micro-aeration box 9 of the above-mentioned novel anaerobic-anoxic-aerobic sewage integrated treatment system are provided with steel meshes and inspection ports.

Further, the upper part of the aeration tank 3 and the micro-aeration tank 9 of the above-mentioned novel anaerobic-anoxic-aerobic sewage integrated treatment system are provided with overflow pipes to communicate with the bottom return water circulation pipeline, and the upper part of the clarification tank 11 is provided with overflow pipes. The flow pipe is connected to the station area drain.

The water quality of the sewage (feces) in the small and medium-sized railway station area suitable for this new type of treatment system is: COD≤500mg/L, _BOD5≤300mg /L, TN≤100mg/L, _NH3 -N≤50mg/L, TP≤ 15mg/L, SS≤200mg/L, pH 6～9.

The utility model has the following beneficial effects:

1. Part of the water in the aeration box and the micro-aeration box is circulated back to the multiphase flow anaerobic reaction tank through the bottom return water, so as to avoid the aging of the sludge in the aeration box and the micro-aeration box and floating to the water surface, which will deteriorate the water quality and significantly change the water quality. it is good. In the bottom return water circulation process, a solid-liquid multiphase flow is formed in the multiphase flow anaerobic reaction tank through hydraulic stirring, and the multiphase flow anaerobic circulation fermentation not only consumes a large amount of manure, but also consumes a large amount of sludge produced by the aerobic process, resulting in The dross is very little. In a test project of the utility model, the dross produced by the system for 5 months is less than 100 kilograms.

2. The utility model uses the aeration control system to monitor the graded aeration on-line, so as to achieve the purpose of not over-aeration and incomplete aeration, and scientific and rational distribution of the aeration amount; and the aeration control system automatically controls the intermittent aeration, on the one hand It is beneficial to reduce power consumption. It is estimated that the power consumption per ton of sewage is 0.8-1.2kWh, which is only about 1/5 of the power consumption of aeration throughout the day. On the other hand, the effluent water quality is improved through grading treatment. The first-stage oxygen exposure removes more than 70-80% of BOD ₅ , COD and other pollutants, and the second-stage is fine oxygen exposure, which further optimizes the water quality and makes it up to grade A class standard.

3. The structural design of the system makes it in constant anaerobic, anoxic and aerobic alternating cycles, the amount of sludge is greatly reduced, and most of the solid manure in the manure is converted into methane, carbon dioxide and nitrogen and other gases for discharge. The amount of slag in the whole system is very small. It was originally expected to extract the dung residue once every six months. After the test project running for 5 months, it is expected that the dung residue will not need to be extracted within one year, which greatly reduces the maintenance workload.

4. After the aeration of the aeration box and the micro-aeration box, the activated sludge in the box consumes the dissolved oxygen in the sewage, and the denitrification reaction begins to remove the organic nitrogen in the sewage. This process has an excellent nitrogen removal effect. On-line detection and automatic control can realize the complete automation of manure disposal in the theater, saving labor.

Description of drawings

Fig. 1 is the connection schematic diagram of the novel anaerobic-anoxic-aerobic sewage integrated treatment system of the present invention;

Fig. 2 is the automatic control flow chart of the novel anaerobic-anoxic-aerobic sewage integrated treatment system of the present invention;

Marked in the figure, 1. Multiphase flow anaerobic reaction tank; 2. Sewage pump; 3. Aeration box; 4. Dissolved oxygen meter; 5. Aeration fan; 6. Aeration control valve, 7. Special aeration head , 8, dissolved oxygen meter probe, 9, micro-exposure box; 10, ultraviolet sterilization lamp; 11, clarification box; 12, sewage pump water level float; 13, circulating pump; 14, circulating pump water level float.

Detailed ways

The following is only a preferred embodiment of the present invention, and it should not be understood that the scope of the above-mentioned subject matter of the present invention is limited to the following examples, and each feature of the present invention can be arbitrarily implemented under the condition of no contradiction. combination, these all belong to the protection scope of the present invention.

Example 1

Referring to Figure 1, the new anaerobic-anoxic-aerobic sewage (fecal) integrated treatment system includes a multiphase flow anaerobic reaction tank 1, an aeration box 3, a micro-aeration box 9, and a UV sterilization lamp. The clarification tank 11 of 10, the multiphase flow anaerobic reaction tank 1 is communicated with the bottom of the aeration tank 3 and the micro-aeration tank 9 to form a backwater cycle, and the manure sewage in the small and medium-sized railway station area is input into the multiphase flow anaerobic reaction tank 1 medium fermentation, the clear night after fermentation is pumped out from the upper part of the multiphase flow anaerobic reaction tank 1 and input into the aeration box 3 for primary aeration, and then pumped out from the middle of the aeration box 3 and input into the micro-aeration box 9 for secondary aeration , after the output from the upper part of the micro-exposure box 9 enters the clarification box 11 for precipitation, clarification and sterilization.

The system also includes three automatic control systems, and the control process is shown in Figure 2: the first water level control system used to control the clear liquid in the multiphase flow anaerobic reaction tank 1 to be pumped into the aeration tank 3, and the first water level control system used to control the aeration tank The water in 3 is fed into the second water level control system of the micro-aeration tank 9, and the aeration control system for controlling the aeration operation of the aeration tank 3 and the micro-aeration tank 9. In the first water level control system, the sewage pump water level float 12 monitors the sewage water level signal, and then transmits it to the sewage pump 2, and determines whether the sewage pump 2 is turned on or off according to whether the water level is high or low. The second water level control system includes a circulating pump 13 and a circulating pump water level float 14, and the working principle is the same as that of the first water level control system. The aeration control system includes a dissolved oxygen meter 4 and an aeration fan 5. The dissolved oxygen meter probe 8 of the dissolved oxygen meter 4 is installed in the aeration box 3, and the aeration is determined according to the oxygen concentration in the aeration box 3 monitored by the dissolved oxygen meter. Fan 5 on and off.

As a preferred treatment system, the tops of the aeration box 3 and the micro-aeration box 9 of the system are provided with steel meshes and inspection ports.

As another preferred treatment system, the upper part of the aeration tank 3 and the micro-aeration tank 9 of the system are provided with overflow pipes to communicate with the bottom return water circulation pipeline, and the upper part of the clarification tank 11 is provided with overflow pipes to connect to the station area gutter.

As another preferred treatment system, the aeration heads of the aeration box 3 and the micro-aeration box 9 of the system are dedicated aeration heads 7 . The special aeration head is described in the patent CN202400911U.

The novel anaerobic-anoxic-aerobic sewage (fecal) integrated treatment system of the present invention can further add other components according to operational needs, and is not limited to the above example, such as the control pipeline opening and closing or flow rate in FIG. 1 The size of the aeration control valve 6 and so on. These are all simple choices within the scope of the present invention, and belong to the protection scope of the present invention.

When using the above system to treat sewage, it is preferable to use intermittent aeration for the primary aeration of the aeration box 3 and the secondary aeration of the micro-aeration box 9. The aeration intermittent time is 2 to 5 hours, and the aeration box 3 is controlled. The oxygen concentration is 2.0 to 8.0 mg/L. When the oxygen concentration of the aeration box 3 is lower than 2.0mg/L, the fan automatically aerates; when the oxygen concentration is higher than 8.0mg/L, the fan automatically stops aeration. By controlling the oxygen concentration in the aeration process, the treatment system is guaranteed to be in a continuous cycle of anaerobic, anoxic and aerobic alternating cycles, and effectively removes BOD ₅ , COD and other pollutants as well as nitrogen and phosphorus in manure sewage.

As a more preferred integrated sewage treatment process, during aeration, the aeration volume of the aeration box 3 accounts for 65-80% of the total aeration, and the aeration volume of the micro-aeration box 9 accounts for 20-35% of the total aeration. %. According to the distribution of aeration volume, the first-level aeration and the second-level fine aeration synergistically remove pollutants efficiently, and the final water quality can reach the first-class A standard.

Example 2

The new anaerobic-anoxic-aerobic sewage (manure) integrated treatment system of implementation 1 was applied to the manure sewage treatment project of the Hump Signal Building of Yangang Railway Station in Emeishan City. The sewage volume is 1～3m ³ /d, and the trial operation was carried out from December 25th to April 30th, 2018, for a total of 125 days. During the trial operation, water samples were taken at different time periods and at different locations for testing. After more than 20 days of trial operation, the system has reached a stable operation state, and the effluent quality is stable. The water quality of the water samples taken from the clarification tank can reach the Class A standard (GB 18918-2002), see Table 1.

Table 1. Main test indicators of effluent

The treatment system of the utility model is convenient for construction and management, and the construction period is very short, only 4 days; the operation cost of the treatment process is relatively low, although there are no processes such as anaerobic pond + oxidation pond, composite filter pond + artificial wetland, etc. These processes require a large area and certain adaptation conditions, so this process still has great advantages. At the same time, in terms of not requiring personnel to be on duty and realizing automatic control, the process can also achieve the effect similar to the purification tank, and does not require the high operating cost of the purification tank.

Claims (6)

1. a kind of Novel anaerobic-anaerobic-aerobic sewage integrated processing system, which is characterized in that including multiphase flow anaerobic reation pool (1), be aerated case (3), micro- exposure case (9), the clarification case (11) for being provided with ultraviolet sterilizing lamp (10), the first water level control system, Second water level control system and aeration control system, the multiphase flow anaerobic reation pool (1) and aeration case (3) and micro- exposure case (9) Bottom connection constitute backwater circulation, middle-size and small-size Railways Stations area waste water inputs fermentation in the multiphase flow anaerobic reation pool (1), The stillness of night after fermentation, which is controlled by the first water level control system from multiphase flow anaerobic reation pool (1) top, is pumped into aeration case (3) progress Level-one exposes oxygen, is then pumped into micro- exposure case (9) progress second level in the middle part of aeration case (3) by the control of the second water level control system and exposes oxygen, It is exported again from micro- exposure case (9) top and enters clarification case (11) precipitating clarification sterilizing, aeration case (3) and micro- exposure for exposing case (9) Oxygen is controlled by aeration control system.

2. Novel anaerobic according to claim 1-anaerobic-aerobic sewage integrated processing system, which is characterized in that the system The first water level control system include the first water-level gauge for being mounted in multiphase flow anaerobic reation pool (1), and connection multiphase flow Anaerobic reation pool (1) and the sewage pump (2) for being aerated case (3), when the first water-level gauge monitors in multiphase flow anaerobic reation pool (1) After water level reaches setting high level, sewage pump (2) starts automatically to draw water to aeration case (3), when water level decreasing is to setting value lower limit, Sewage pump (2) is automatically stopped.

3. Novel anaerobic according to claim 1-anaerobic-aerobic sewage integrated processing system, which is characterized in that the system The second water level control system include the second water-level gauge being mounted in aeration case (3), and connection aeration case (3) and micro- exposure case (9) circulating pump (13), after the second water-level gauge monitors that the water level in aeration case (3) reaches setting high level, circulating pump (13) Automatically start and draw water to micro- exposure case (9), when water level decreasing is to setting value lower limit, circulating pump (13) is automatically stopped.

4. Novel anaerobic according to claim 1-anaerobic-aerobic sewage integrated processing system, which is characterized in that the system Aeration control system include dissolved oxygen meter (4) and Aeration fan (5), the oxygen in dissolved oxygen meter (4) on-line monitoring aeration case (3) contains Amount controls Aeration fan (5) in due course automatic aeration according to oxygen concentration.

5. Novel anaerobic according to claim 1-anaerobic-aerobic sewage integrated processing system, which is characterized in that the exposure Steel wire and access hole are equipped at the top of gas tank (3) and micro- exposure case (9).

6. Novel anaerobic according to claim 1-anaerobic-aerobic sewage integrated processing system, which is characterized in that the exposure Gas tank (3) and micro- top for exposing case (9) are provided with overflow pipe and are connected to bottom backwater circulation pipeline, clarify the top of case (11) It is provided with overflow pipe and is connected to station area gutter.