Organic sludge treatment system

Abstract

An organic sludge treatment system is characterized in that a residual sludge inlet pipe is connected with an original sludge concentration tank, the original sludge concentration tank is connected with a sludge dewatering system and a sludge floc destroying tank, the sludge floc destroying tank is connected with an aeration device, a sludge floc destroying part, a front oxidation zone and an efficient decomposition zone are connected with the original sludge concentration tank, the front oxidation zone is connected with the aeration device, and the efficient decomposition zone is connected with the sludge dewatering system. The efficient decomposition area is connected with the feeding device and the front end of the biochemical pool. After the excess sludge enters the sludge thickening tank, the excess sludge is guided into the sludge treatment unit from the sludge thickening tank, the sludge treatment unit performs efficient wall breaking on dead bacterial cells of the excess sludge, and quickly decomposes and precipitates the sludge components after wall breaking, so that the excess sludge is decomposed at low cost, and the volume of the excess sludge in a sewage treatment facility is remarkably reduced; and the purpose of reducing organic sludge discharge is achieved. Supernate treated by the sludge treatment unit is connected with an adjusting tank at the foremost end of a biochemical reaction tank of a sewage plant, and residual sludge in the unit is connected with a sludge concentration tank of the sewage plant through a sludge return pipeline.

Description

Technical Field

[0001] The utility model belongs to the technical field of sludge treatment, and in particular relates to an organic sludge treatment system. Background Art

[0002] Organic sludge refers to sludge with organic matter as the main component. Its main characteristics are high organic content, easy to decompose and stink, fine particles, small specific gravity, high water content and difficult to dehydrate, hydrophilic substances with colloidal structure, easy to transport through pipes and canals; and organic matter contains a lot of nutrients.

[0003] After the existing organic sludge is treated, the remaining sludge is generally dried. The dried sludge is large and inconvenient to carry. Then the dried sludge is transported to the pre-buried site by personnel, which not only wastes a lot of manpower and material resources for pre-buried, but also may cause overnutrition at the pre-buried site and lead to excessive microbial reproduction, causing pollution to the pre-buried site. Summary of the invention

[0004] The purpose of the utility model is to provide an organic sludge treatment system in order to overcome the deficiencies of the prior art.

[0005] The technical solution adopted by the utility model is:

[0006] An organic sludge treatment system comprises a residual sludge inlet pipe, characterized in that the residual sludge inlet pipe is connected to an original sludge thickening tank, the original sludge thickening tank is connected to a sludge dewatering system, the lifting pump of the sludge thickening tank is connected to a sludge floc destruction tank, and is provided with a flow meter and a sludge concentration meter, the sludge floc destruction tank is connected to an aeration device, the aeration device is provided with an ozone generator, the sludge floc destruction is connected to a pre-oxidation zone, the pre-oxidation zone is connected to a high-efficiency decomposition zone, the pre-oxidation zone and the high-efficiency decomposition zone are connected to the original sludge thickening tank, the pre-oxidation zone is connected to the aeration device, the aeration device is provided with an ozone generator, the high-efficiency decomposition zone is connected to a feeding device, the feeding device is provided with a strain feeding port, the high-efficiency decomposition zone is connected to the front end of a biochemical tank, and is provided with a sludge concentration meter and a flow meter.

[0007] An organic sludge treatment system includes a sewage inlet, characterized in that the sewage inlet is connected to a biochemical reaction tank of a sewage treatment plant, and the biochemical reaction tank of the sewage treatment plant is connected to a secondary sedimentation tank; the secondary sedimentation tank is connected to an external discharge port through one channel, connected to a sludge treatment unit through one channel, and connected to the biochemical reaction tank of the sewage treatment plant through a sludge return pipeline through one channel; the sludge treatment unit is connected to a residual sludge discharge port through one channel, and connected to the biochemical reaction tank of the sewage treatment plant through another channel.

[0008] The sludge treatment unit comprises a sludge dissolution tank, which is connected to an ozone generator.

[0009] The sludge dissolution tank is provided with a micro-nano aeration device.

[0010] The sludge treatment unit comprises a sludge biochemical decomposition tank and a sludge dissolution tank. The sludge biochemical decomposition tank is connected to the sludge dissolution tank. The sludge biochemical decomposition tank is provided with a micro-nano aeration device and nitrifying bacteria are added. The sludge dissolution tank is connected to an ozone generator.

[0011] The nitrifying bacteria are high-efficiency nitrifying bacteria QS1.

[0012] The beneficial effects of the utility model are:

[0013] The cell membranes of inert microorganisms and active microorganisms, which are the main components of excess sludge, are quickly broken and degraded using the following methods:

[0014] 1. Ozone + micro-nano aeration is used to treat the remaining sludge, and after converting the sludge into soluble mud water, it is returned to the front end of the biochemical pool of the sewage plant as a nutrient component (BOD) for further treatment, and finally becomes standard water discharge;

[0015] 2. Micro-nano aeration + high-efficiency nitrifying bacteria decomposition treatment is used for the excess sludge. High-efficiency nitrifying bacteria can generate protein decomposing enzymes for high-concentration excess sludge, break the cell membrane of dead bacteria, and quickly decompose BOD and other nutrients in the cytoplasm after the cell membrane is broken. The supernatant after precipitation enters the front-end regulating tank of the conventional sewage treatment plant;

[0016] 3. For sewage treatment plants with higher requirements for system stability and effluent water quality, the residual sludge can be treated with front-end micro-nano aeration + high-efficiency nitrifying bacteria decomposition. The supernatant after precipitation enters the back-end, and the dissolved residual sludge is further decomposed and purified using an ozone micro-nano aeration device.

[0017] Decompose and reduce the volume of excess sludge generated in wastewater purification facilities at low cost, thereby reducing the discharge of organic sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the system principle of Example 1. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1As shown, an organic sludge treatment system, after the residual sludge enters the sludge thickening tank, is introduced from the sludge thickening tank into the sludge treatment unit. The sludge treatment unit consists of two treatment processes: the front stage micro-nano aeration + ozone process implements efficient cell wall breaking of the dead bacteria cells of the residual sludge, and the rear stage uses efficient nitrifying bacteria + micro-nano aeration process to quickly decompose and precipitate the sludge components after cell wall breaking, decomposing and significantly reducing the volume of residual sludge in the sewage treatment facility at a low cost, achieving the purpose of reducing the discharge of organic sludge. The supernatant after treatment by the sludge treatment unit is connected to the regulating tank at the front end of the biochemical reaction tank of the sewage treatment plant, and the residual sludge in the unit is connected to the sludge thickening tank of the sewage treatment plant through the sludge return pipeline.

[0021] The sludge treatment unit comprises a sludge dissolution tank, which is connected to an ozone generator.

[0022] The sludge dissolution tank is provided with a micro-nano aeration device.

[0023] The sludge treatment unit comprises a sludge biochemical decomposition tank and a sludge dissolution tank. The sludge biochemical decomposition tank is connected to the sludge dissolution tank. The sludge biochemical decomposition tank is provided with a micro-nano aeration device and nitrifying bacteria are added. The sludge dissolution tank is connected to an ozone generator.

[0024] The nitrifying bacteria are high-efficiency nitrifying bacteria QS1.

[0025] The activated carbon processing filler used in this excess sludge digestion system is removed every 3-4 months (adjusted according to the specific indicators of influent pollutants) and replaced with new cultured live bacteria filler. The removed activated carbon processing filler has absorbed effective live bacteria QS1 and excess total nitrogen and total phosphorus nutrients, and can be directly processed into solid or liquid organic fertilizer.

[0026] One implementation method, an organic sludge treatment system, includes a sewage inlet, the sewage inlet is connected to a biochemical reaction tank of a sewage treatment plant, the biochemical reaction tank of the sewage treatment plant is connected to a secondary sedimentation tank; the secondary sedimentation tank is connected to an external discharge port on one side, connected to a sludge treatment unit on another side, and connected to the biochemical reaction tank of the sewage treatment plant through a sludge return pipeline on another side; the sludge treatment unit is connected to a residual sludge discharge port on one side, and connected to the biochemical reaction tank of the sewage treatment plant on another side.

[0027] After the sewage enters the biochemical reaction tank of the sewage treatment plant for treatment, it is precipitated in the secondary sedimentation tank, and then the sludge is extracted to the sludge treatment unit.

[0028] like Figure 1 As shown, the sludge treatment unit includes a sludge dissolution tank, which is connected to an ozone generator.

[0029] The residual sludge generated after conventional treatment in the sewage plant is introduced into the micro-nano aeration treatment tank (or tank) using ozone through the sludge concentration tank. This treatment tank is designed to be cylindrical, and the residual sludge enters from the bottom, and is aerated and pushed through the micro-nano aeration device set at the bottom, and forms a swirling upward flow, so that the micro-nano bubbles can be fully mixed with the mud and water, increasing the contact specific surface area and achieving the best decomposition effect.

[0030] The ozone generated by the ozone generator is inhaled into the air inlet of the micro-nano aeration device, which can produce a large number of hydroxyl radicals in the water (much higher than the hydroxyl radicals generated by using ozone alone), accelerating the dead bacteria wall breaking process of the main components of the residual sludge. By controlling the treatment time, the residual dead bacteria are quickly decomposed, the live bacteria are killed, and they are converted into nutrients (BOD components). The organic matter is completely decomposed and sterilized, and then it is returned to the front-end regulating tank of the existing sewage treatment plant, and the decomposed nutrients (BOD) are put into the front-end regulating tank of the conventional sewage treatment, and finally converted into standard water discharge.

[0031] Example 1 Time: August 12-14, 2019; Location: Chayuan Wastewater Treatment Plant, Nan'an District, Chongqing;

[0032] The amount of residual sludge mixed liquid at the entrance of the sludge thickening tank: about 1.6m3

[0033] The amount of proteolytic enzyme preparation used in the first stage: 700ml The test results are as above:

[0034] The second stage uses an ozone micro-nano aeration device: the micro-nano aerator uses the OH-clean chain device KSJ80 type, the supporting submersible pump has a flow rate of 80 liters / minute, a head of 11 meters, a power of 0.75KW, and an ozone generator specification: 50 grams of ozone per hour. After 8 hours of treatment in the first stage, the outflowing muddy water was treated by the aforementioned ozone micro-nano aeration device for 1 hour, and the sludge concentration (MLSS) dropped to 3186 mg / L. After the sludge composition analysis, 90% was inorganic matter. It was confirmed that more than 90% of the organic matter components had been degraded.

[0035] See Table 1:

[0036]

[0037] In another embodiment, the sludge treatment unit includes a sludge biochemical decomposition tank and a sludge dissolution tank, the sludge biochemical decomposition tank is connected to the sludge dissolution tank; the sludge biochemical decomposition tank is provided with a micro-nano aeration device and nitrifying bacteria are added; the sludge dissolution tank is connected to an ozone generator.

[0038] The residual sludge is treated with micro-nano aeration + high-efficiency nitrifying bacteria decomposition. In the aerobic tank of the residual sludge treatment section, high-efficiency nitrifying bacteria QS1 (CGMCC: 17314) is used to quickly generate protease for high-concentration residual sludge, effectively break the cell membrane of dead bacteria, and quickly decompose BOD and other nutrients in the cytoplasm after breaking the cell membrane. The supernatant after precipitation enters the front-end regulating tank of the conventional sewage treatment plant; the precipitated activated sludge is quantitatively returned to the aerobic treatment tank for recycling.

[0039] For sewage treatment plants with higher requirements for system stability and effluent water quality, the residual sludge can be treated with front-end micro-nano aeration + high-efficiency nitrifying bacteria decomposition. The supernatant after precipitation enters the back-end, and the dissolved residual sludge is further decomposed and purified using an ozone micro-nano aeration device. Example

[0040] Time: August 18-19, 2019; Location: Chayuan Wastewater Treatment Plant, Nan'an District, Chongqing;

[0041] The amount of residual sludge mixed liquid at the entrance of the sludge thickening tank: about 1.6m3

[0042] The first stage is treated with QS1 activated bacterial solution, usage: 500ml, the number of live bacteria is about 10 million / ml

[0043] The test results are as follows:

[0044] The second stage uses an ozone micro-nano aeration device: the micro-nano aerator uses the OH-clean chain device KSJ80 type, the supporting submersible pump has a flow rate of 80 liters / minute, a head of 11 meters, a power of 0.75KW, and an ozone generator specification: 50 grams of ozone per hour. After 8 hours of treatment in the first stage, the outflowing muddy water was treated by the aforementioned ozone micro-nano aeration device for 2 hours, and the sludge concentration (MLSS) dropped to 2240 mg / L. After the sludge composition analysis, it was basically all inorganic matter. It was confirmed that the organic matter components had been basically degraded.

[0045] See Table 2:

[0046]

[0047] This combined treatment method can degrade organic sludge more thoroughly. If conditions permit (if there is enough space around the sludge concentration tank of the current sewage plant), it is recommended to set up an ozone + micro-nano treatment tank at the rear end of the QS1 treatment tank to achieve deep degradation of organic sludge and sterilization and decolorization at the same time. This method has no effect on the influent stability of the current sewage plant. On the basis of maintaining the stable effluent of the sewage plant, it can completely degrade organic sludge without the current sewage plant back-end sludge treatment process (after sludge concentration, adding flocculants for coagulation, using plate and frame filter press to dehydrate to mud cakes with a water content of less than 80% and then transport them for external treatment).

[0048] This process requires only a small amount of inorganic silt to be removed periodically from the ozone tank.

[0049] Typical processing cases:

[0050] Sludge in-situ treatment system for a 5,000-ton domestic sewage treatment plant

[0051] At the 5,000-ton domestic sewage treatment plant in Limu County, Japan, 40-50 tons of excess sludge is generated every day and enters the sludge thickening tank. A residual sludge digester is set up. Figure 1 The first tank is 9.5 cubic meters and uses micro-nano aeration + ozone technology, the main purpose of which is to break the cell wall of a large number of dead bacteria in the remaining sludge;

[0052] Then it enters the second tank, which is designed to be 95 cubic meters. The bottom one-third is the second micro-nano aeration + ozone treatment; most of the ozone in the middle is converted into oxygen molecules and oxygen atoms, combined with the middle and upper parts to form an aerobic treatment part, using ozone-tolerant nitrifying bacteria QS1, and activated carbon processing fillers are added to the top, so that most of the QS1 bacteria are retained in the activated carbon processing fillers, which plays the role of a sedimentation and filtration tank;

[0053] The residual sludge processor designed and processed as above has the advantages of small footprint, high sludge degradation efficiency, and no need for sludge discharge.

[0054] After the organic sludge is treated by this process, the COD of the top clear liquid effluent can be reduced to 800-1200ppm, TP 8-10ppm, TN 80-100ppm. This supernatant is returned to the front-end regulating tank of the domestic sewage treatment plant. Since the COD of 5,000 tons of domestic sewage per day is 300-400ppm, TN 30-50ppm, TP 5-6ppm; therefore, the supernatant after the digestion of 40-50 tons of sludge returned every day has almost no effect on the influent indicators after dilution with the influent water.

[0055] This residual sludge digestion processor has been operating normally for more than one and a half years. The effluent discharge from the sewage treatment plant has been consistently meeting the standards. At the same time, no organic residual sludge has been discharged, and only the inorganic sediment deposited at the bottom of the second tank is extracted regularly (twice a year).

Claims

1. An organic sludge treatment system, comprising a residual sludge inlet pipe, characterized in that: The residual sludge inlet pipe is connected to the original sludge thickening tank, the original sludge thickening tank is connected to the sludge dewatering system, the lifting pump of the sludge thickening tank is connected to the sludge floc destruction tank, and is equipped with a flow meter and a sludge concentration meter, the sludge floc destruction tank is connected to the aeration device, the aeration device is equipped with an ozone generator, the sludge floc destruction tank is connected to the pre-oxidation zone, the pre-oxidation zone is connected to the high-efficiency decomposition zone, the pre-oxidation zone and the high-efficiency decomposition zone are connected to the original sludge thickening tank, the pre-oxidation zone is connected to the aeration device, the aeration device is equipped with an ozone generator, the high-efficiency decomposition zone is connected to the feeding device, the feeding device is equipped with a bacterial strain feeding port, the high-efficiency decomposition zone is connected to the front end of the biochemical tank, and is equipped with a sludge concentration meter and a flow meter.

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