CN116161791A - Rural sewage treatment system and method powered by solar energy - Google Patents
Rural sewage treatment system and method powered by solar energy Download PDFInfo
- Publication number
- CN116161791A CN116161791A CN202310224299.8A CN202310224299A CN116161791A CN 116161791 A CN116161791 A CN 116161791A CN 202310224299 A CN202310224299 A CN 202310224299A CN 116161791 A CN116161791 A CN 116161791A
- Authority
- CN
- China
- Prior art keywords
- zone
- solid
- liquid separation
- water
- sewage treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 63
- 239000010865 sewage Substances 0.000 title claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 130
- 239000007788 liquid Substances 0.000 claims abstract description 74
- 238000000926 separation method Methods 0.000 claims abstract description 54
- 230000005484 gravity Effects 0.000 claims abstract description 36
- 238000011001 backwashing Methods 0.000 claims abstract description 34
- 238000005273 aeration Methods 0.000 claims abstract description 33
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 27
- 229910052698 phosphorus Inorganic materials 0.000 claims description 27
- 239000011574 phosphorus Substances 0.000 claims description 27
- 230000009977 dual effect Effects 0.000 claims description 18
- 239000000945 filler Substances 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 238000004659 sterilization and disinfection Methods 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 5
- 239000004814 polyurethane Substances 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 5
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000010992 reflux Methods 0.000 claims description 3
- 230000029087 digestion Effects 0.000 claims description 2
- 238000000746 purification Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 9
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 6
- 239000003344 environmental pollutant Substances 0.000 abstract description 6
- 231100000719 pollutant Toxicity 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 230000000694 effects Effects 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 229910002651 NO3 Inorganic materials 0.000 description 7
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 230000005855 radiation Effects 0.000 description 7
- 239000010802 sludge Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000005868 electrolysis reaction Methods 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- -1 iron ions Chemical class 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 239000005416 organic matter Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000011259 mixed solution Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000001546 nitrifying effect Effects 0.000 description 2
- 125000001477 organic nitrogen group Chemical group 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000006396 nitration reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000009287 sand filtration Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/009—Apparatus with independent power supply, e.g. solar cells, windpower, fuel cells
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention belongs to the technical field of sewage treatment, and particularly relates to a rural sewage treatment system and method powered by solar energy. The system comprises a solid-liquid separation zone for raw water pretreatment, wherein the drainage end of the solid-liquid separation zone is sequentially connected with an anoxic zone and an aerobic zone; the drainage end of the solid-liquid separation zone is also connected with an SND zone, and the anoxic zone, the aerobic zone and the SND zone are arranged in parallel; the drainage ends of the aerobic zone and the SND zone are connected with a gravity type gas-water double backwashing biological filter device; the solid-liquid separation area is provided with an electrolytic dephosphorization device, the aerobic area and the SND area are both provided with an aeration device, and the electrolytic dephosphorization device and the aeration device are connected with solar equipment. The system and the process can remove pollutants such as SS, COD, ammonia nitrogen and the like in the sewage, and are simple in process, less in mud production, low in cost, simple and convenient in operation and maintenance, free of professional operation and maintenance personnel, and more suitable for rural decentralized sewage treatment.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a rural sewage treatment system and method powered by solar energy.
Background
At present, scattered domestic sewage is collected and treated in a village household-to-household or household-to-household mode, and aeration in an aerobic zone in the existing sewage treatment process is an energy-consuming process, and a fan or an air pump is generally used for supplying oxygen, so that electric energy consumption and operation faults can necessarily occur, and electric operation and maintenance personnel with stronger professionals are required for overhauling fault points, so that the operation and maintenance of water treatment in remote areas are difficult, and the labor cost is increased, and therefore, the application of the aerobic aeration in the water treatment in the remote areas is limited.
The traditional activated sludge biological dephosphorization method is influenced by various aspects such as water quality of inflow water, sludge discharge condition, anaerobic condition of an anaerobic zone and the like, so that the operation and maintenance of a project site are more difficult; the electrolytic phosphorus removal method is a method for strengthening phosphorus removal in the centralized sewage treatment of villages and towns, the electrolytic phosphorus removal method requires a switching power supply and an electrolytic phosphorus removal controller, the switching power supply and the controller belong to consumable products, the fault is easy to occur, potential safety hazards exist, and long-term aeration and electric charge of the electrolytic phosphorus removal operation are also a small burden. In addition, power supply modes for sewage treatment often have power failure conditions such as pipe network overhaul, private power failure for electricity saving and the like, and for joint household sewage treatment, power consumption disputes are always a problem which is difficult to coordinate in sewage treatment project implementation, and the problems of difficult implementation of sewage treatment projects, unfavorable stable operation of a sewage treatment system and the like are caused.
Disclosure of Invention
Aiming at the problems existing in the current rural sewage treatment, the invention provides a solar power supply rural sewage treatment system and method, which have the advantages of simple process, convenient operation and management, stable and standard effluent and low cost, and are suitable for decentralized rural domestic sewage treatment.
Based on the above purpose, the technical scheme adopted by the invention is as follows:
in a first aspect, the invention provides a rural sewage treatment system powered by solar energy, which comprises a solid-liquid separation area for pretreatment of raw water, wherein a drainage end of the solid-liquid separation area is sequentially connected with an anoxic area and an aerobic area; the drainage end of the solid-liquid separation zone is also connected with an SND (synchronous nitrification and denitrification) zone, and the anoxic zone, the aerobic zone and the SND zone are arranged in parallel; the drainage ends of the aerobic zone and the SND zone are connected with a gravity type air-water double backwashing biological filter device; the solid-liquid separation zone is provided with an electrolytic dephosphorization device, the aerobic zone and the SND zone are both provided with an aeration device, and the electrolytic dephosphorization device and the aeration device are connected with solar equipment.
Preferably, the electrolytic dephosphorizing device is a double-iron electrolytic plate or a double-aluminum electrolytic plate or an aluminum-iron electrolytic plate; the electrolytic plates are two rectangular plates with the same size, and the plate spacing is 5-40 mm.
Preferably, the power supply voltage of the electrolytic dephosphorization device is 5-30V direct current voltage.
Preferably, the solar energy equipment comprises a solar photovoltaic panel and an energy accumulator connected with the solar photovoltaic panel, wherein the energy accumulator is also connected with a time relay, and the time relay is connected with the electrolytic dephosphorization device and the aeration device.
Solar photovoltaic panels utilize the photoelectric effect to directly convert solar radiation energy into electrical energy. Illustratively, the solar photovoltaic panel has a length by width of 800 by 600mm to 2000 by 1000mm; illustratively, the solar photovoltaic panel is comprised of one or more pieces; the solar photovoltaic panel is illustratively placed above a connection device, such as an electrolytic phosphorus removal device, an aeration device, facing the location where the solar radiation is strongest. Illustratively, the solar photovoltaic panel is connected to an energy storage device, and the converted electric energy is stored in the energy storage device to ensure that the current is output under the condition of voltage stabilization.
The parameters of the energy accumulator are 12V 24AH-12V 250AH. The energy store is connected to a time relay, for example, which can be adjusted for the supply time. Illustratively, the power supply time, normally open: 6:00-23:00, intermittently opening: 23:00-6:00, and supplying power for 5-10min every 1 h. The power supply time is set according to the characteristic of small water consumption in daily evening in rural areas, and the electric energy of the energy accumulator is saved.
Preferably, the gravity type air-water dual backwashing biological filter device comprises a water inlet cavity and a water outlet cavity, wherein the water inlet cavity is communicated with the bottom of the water outlet cavity; a packed bed is fixed in the water inlet cavity; the water inlet cavity is provided with a water inlet, and the water inlet is connected with the aerobic zone or the SND zone; the water outlet cavity is provided with a water outlet.
Preferably, the filler is a polyurethane sponge cube, and the filling rate of the filler in the water inlet cavity is 10% -70%.
In a second aspect, the invention provides a rural sewage treatment method using the system.
The rural sewage treatment method powered by solar energy comprises the following steps of:
1) Treating raw water by a solid-liquid separation area, and collecting mixed liquid separated by solid-liquid separation;
2) The mixed liquid of solid-liquid separation is treated as follows:
a) The mixed liquor after solid-liquid separation flows into an anoxic zone for denitrification treatment, the mixed liquor after denitrification treatment flows into an aerobic zone for nitrification reaction, the mixed liquor after digestion reaction flows into a gravity type gas-water dual backwashing biological filter device for treatment, and effluent is discharged after disinfection;
or b) the mixed liquid of solid-liquid separation flows into an SND zone for synchronous nitrification and denitrification treatment, the mixed liquid treated by the SND zone flows into a gravity type gas-water dual backwashing biological filter for treatment, and the effluent is discharged after disinfection.
Preferably, the effluent treated by the gravity type gas-water double backwashing biological filtering device flows back to the solid-liquid separation area for purification treatment; and (3) refluxing the effluent treated by the aerobic zone into an anoxic zone and then purifying.
Preferably, an electrolytic phosphorus removing device is arranged in the solid-liquid separation area, and the electrolytic phosphorus removing device exchanges the anode and the cathode of the electrolytic plate at intervals of 3-12 hours; the aeration device of the aerobic zone is intermittent aeration, and the intermittent aeration period is controlled by a time relay.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention uses solar energy to supply electricity to remove phosphorus and aeration, saves electric energy, yi Yunwei, has low running cost, and can be unattended.
(2) The A/O process adopts a biological contact oxidation method, more microorganisms or suspended sludge are attached to the filler, and after multiple precipitation in the solid-liquid separation area and the anoxic area, large-size and large-particle insoluble substances are separated, the sludge yield of sewage flowing into the aerobic area is greatly reduced, no additional precipitation area is needed, no nitrifying liquid backflow is needed, and the sewage is directly treated by a gravity type gas-water dual backwashing biological filtering device, so that the SS stability is less than 10mg/L, and the process is simplified.
(3) Compared with the A/O process, the SND process has the advantages of less aeration, no need of nitrifying liquid reflux, lower energy consumption and simpler operation and maintenance.
(4) The solid-liquid separation area of the invention is deposited with a certain amount of sludge, and can also play a role in biological dephosphorization, and the total phosphorus of the effluent can be ensured to reach the first grade B standard GB18918-2002 by being matched with electrolysis dephosphorization.
Drawings
FIG. 1 is a schematic diagram of a gravity type gas-water double backwashing biological filter device;
FIG. 2 is a flow chart of the A/O process of the present invention;
fig. 3 is a SND process flow diagram.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples. It will be appreciated by persons skilled in the art that the specific embodiments described herein are for purposes of illustration only and are not intended to be limiting.
The test methods used in the examples are conventional methods unless otherwise specified; the materials, reagents and the like used, unless otherwise specified, are all commercially available.
Example 1
The embodiment provides a rural sewage treatment system powered by solar energy, which comprises a solid-liquid separation area for raw water pretreatment, wherein the drainage end of the solid-liquid separation area is sequentially connected with an anoxic area and an aerobic area; the drainage end of the solid-liquid separation zone is also connected with an SND (synchronous nitrification and denitrification) zone, and the anoxic zone, the aerobic zone and the SND zone are arranged in parallel; and the drainage ends of the aerobic zone and the SND zone are connected with a gravity type air-water double backwashing biological filter device. The solid-liquid separation area is provided with an electrolytic dephosphorization device which is a double-iron electrolytic plate or a double-aluminum electrolytic plate or an aluminum-iron electrolytic plate; the electrolytic plates are two rectangular plates with the same size, the plate spacing is 5-40 mm, and the power supply voltage of the electrolytic phosphorus removing device is 5-30V direct current voltage. The iron ions or aluminum ions released by the anode are combined with phosphorus in the mixed solution in the form of phosphate radical to form indissolvable ferric salt through electrolysis, and the total phosphorus concentration in raw water is reduced under the actions of precipitation, flocculation and floatation. The electrolytic dephosphorization device changes the positive electrode and the negative electrode once within 3-12 hours, on one hand, the passivation of the electrode plate of one electrode is prevented, and on the other hand, the use and the replacement period are prolonged. The solid-liquid separation area needs to be cleaned once in 3-6 months, and the electrolytic dephosphorization electrode plate needs to be replaced once in 3 months.
The electrolytic phosphorus removing device and the aeration device are connected with solar equipment and can be powered by solar energy. The solar energy equipment comprises a solar photovoltaic panel and an energy accumulator connected with the solar photovoltaic panel, wherein the energy accumulator is also connected with a time relay, and the time relay is connected with an electrolytic dephosphorization device and an aeration device.
Solar photovoltaic panels utilize the photoelectric effect to directly convert solar radiation energy into electrical energy. Illustratively, the solar photovoltaic panel has a length by width of 800 by 600mm to 2000 by 1000mm; illustratively, the solar photovoltaic panel is comprised of one or more pieces; the solar photovoltaic panel is illustratively placed above a connection device, such as an electrolytic phosphorus removal device, an aeration device, facing the location where the solar radiation is strongest. Illustratively, the solar photovoltaic panel is connected to an energy storage device, and the converted electric energy is stored in the energy storage device to ensure that the current is output under the condition of voltage stabilization.
The parameters of the energy accumulator are 12V 24AH-12V 250AH. The energy store is connected to a time relay, for example, which can be adjusted for the supply time. Illustratively, the power supply time, normally open: 6:00-23:00, intermittently opening: 23:00-6:00, and supplying power for 5-10min every 1 h. The power supply time is set according to the characteristic of small water consumption in daily evening in rural areas, and the electric energy of the energy accumulator is saved.
The whole rural sewage treatment system powered by solar energy can be additionally provided with a set of power supply system so as to be used for preparing the conditions of greatly reducing the solar radiation in winter or continuously in overcast and rainy days.
In addition, the aerobic zone and the SND zone are both provided with aeration devices, aeration in the aerobic zone or the SND zone is provided by an air pump, the air pump is powered by a solar panel and is connected with the same energy accumulator, and the air pump is of a direct-current type or a direct-current-alternating-current type.
In addition, the gravity type air-water double backwashing biological filter device is shown in fig. 1, and comprises a water inlet cavity and a water outlet cavity, wherein the water inlet cavity is communicated with the bottom of the water outlet cavity; a packed bed is fixed in the water inlet cavity; the water inlet cavity is provided with a water inlet, and the water inlet is connected with the aerobic zone or the SND zone; the water outlet cavity is provided with a water outlet. The filler is a polyurethane sponge cube, the side length of the sponge cube is 10-50mm, and the filling rate of the filler in the water inlet cavity is 10-70%.
The gravity type gas-water double backwashing biological filter device is mainly used for filtering solid-liquid separation without single water body, and is also used as a permeable separation type biological membrane carrier. The packed bed separates the cavity of the gravity type air-water dual backwashing biological filtering device to form a water inlet cavity at the upper part and a water outlet cavity at the lower part, the water inlet cavity is communicated with the water outlet of the aerobic zone, and the water outlet cavity is communicated with the atmosphere. The water outlet cavity is internally provided with a backwash aeration pipe, the water inlet cavity is provided with a backwash water outlet, and the backwash water outlet is connected with the solid-liquid separation tank. The water flowing in from the aerobic zone passes through the fixed packed bed under the action of gravity, and the SS in the water is removed by layer-by-layer filtration of the fixed packed bed. With the increase of the filtered water quantity, a biological film is gradually formed on the fixed packed bed, so that pollutants such as COD, ammonia nitrogen, total phosphorus and the like in the water can be further removed.
The gravity type air-water double backwashing biological filter device does not need to be provided with a water pump or a backwashing pump to provide power. Gravity self-flowing filtration is adopted, double backwashing is carried out by means of desorption and air water extrusion, an air pump is directly shared with the aerobic zone, and the backwash water is discharged in a gas stripping mode without extra power consumption.
Example 2
The invention provides a method for treating rural sewage by using the system in embodiment 1, which comprises aeration and electrolytic dephosphorization processes by using solar photovoltaic effect, and relates to two alternative treatment processes, namely an A/O process and an SND process.
The A/O process flow is shown in FIG. 2, and comprises the following steps:
a. raw water enters a solid-liquid separation area after passing through the grating, and large-particle insoluble substances settle in the solid-liquid separation area to realize solid-liquid separation. Macromolecular organic matters can be further decomposed in the solid-liquid separation area. Meanwhile, the contact of raw water, backwash liquid and sludge in the solid-liquid separation area can reduce the concentration of dissolved oxygen in the mixed liquid. The backwash liquid is derived from water treated by the gravity type gas-water dual backwash biological filter device.
b. The mixed liquid formed by raw water and backwash liquid enters an anoxic zone after coming out of a solid-liquid separation zone, the anoxic zone is intermittently aerated, the intermittent time is controlled by a time relay or an electromagnetic valve, the intermittent aeration is provided by an air pump, and the air pump is powered by a solar panel and is connected with the same energy accumulator. In this zone, denitrification is mainly performed. The denitrifying bacteria uses oxygen in nitrate in raw water as an electron acceptor under the condition of low dissolved oxygen to reduce the nitrate into nitrogen, and a small amount of nitrate can be reduced into nitrogen.
c. The mixed solution treated by the anoxic zone flows into the aerobic zone from the water outlet of the anoxic zone for nitration reaction. And adding filler in the aerobic zone, wherein the filler is a sponge cube, the material is polyurethane, the side length of the filler is 10-50mm, and the filling rate is 10-70%. Part of the organic matter in the sewage is used for synthesizing new cells, and the other part of the organic matter is subjected to catabolism so as to obtain the energy required by cell synthesis, and the final product is CO 2 And H 2 Stable substances such as O. While partial organic matters are oxidized, organic nitrogen and free ammonia nitrogen in the sewage are gradually converted into nitrite under the condition of sufficient dissolved oxygenAnd nitrate. d. The mixed liquid treated by the aerobic zone directly enters a gravity type air-water dual backwashing biological filter device for treatment through a water outlet of the aerobic zone.
e. The effluent can be discharged after being disinfected by tablets or ultraviolet rays.
The SND process flow is shown in fig. 3, and comprises the following steps:
a. raw water enters a solid-liquid separation area after passing through the grating, and large-particle insoluble substances settle in the solid-liquid separation area to realize solid-liquid separation. Macromolecular organic matters can be further decomposed in the solid-liquid separation area. Meanwhile, the contact of raw water, backwash liquid and sludge in the solid-liquid separation area can reduce the concentration of dissolved oxygen in the mixed liquid, and the backwash liquid is derived from water treated by the gravity type gas-water dual backwash biological filter device.
b. The mixed liquid formed by raw water and backwash liquid enters an SND (synchronous nitrification and denitrification) zone after coming out of a solid-liquid separation zone, filler is added into the SND zone, the filler is a sponge cube, the material is polyurethane, the side length of the filler is 30-60mm, and the filling rate is 10-70%. Aeration in the aerobic zone or the SND zone is provided by an air pump, the air pump is powered by a solar panel and is connected with the same energy accumulator, and the air pump is of a direct-current type or a direct-current-alternating-current type. A microscopic aerobic zone is formed on the surface of the filler in the zone through aeration, and a microscopic anaerobic zone is formed in the filler to synchronously perform nitrification and denitrification. Part of the organic matter in the sewage is used for synthesizing new cells, and the other part of the organic matter is subjected to catabolism so as to obtain the energy required by cell synthesis, and the final product is CO 2 And H 2 Stable substances such as O. While partial organic matters are oxidized, organic nitrogen and free ammonia nitrogen in sewage are gradually converted into nitrite and nitrate on the surface of the filling material under the condition that dissolved oxygen is sufficient. Inside the filler, denitrifying bacteria reduce nitrate to nitrogen by using oxygen in the nitrate as an electron acceptor under the condition of low dissolved oxygen.
d. The mixed liquid treated by the SND zone directly enters a gravity type gas-water dual backwashing biological filter device for treatment.
e. The effluent of the gravity type gas-water dual backwashing biological filtering device can be discharged after tablet sterilization or ultraviolet sterilization.
In the two processes, the solid-liquid separation area needs to be cleaned once for 3-6 months, the solid-liquid separation area is provided with the electrolytic dephosphorization device, the electrolytic dephosphorization device is a double-iron electrolytic plate or a double-aluminum electrolytic plate or an aluminum-iron electrolytic plate, the electrolytic plates are in the shape of two rectangles with the same size, and the plate spacing is 5-40 mm. The adjustable power supply equipment provides 5-30V direct current voltage. The electrolytic phosphorus removal plate needs to be replaced once in 3 months. The iron ions or aluminum ions released by the anode are combined with phosphorus in the mixed solution in the form of phosphate radical to form indissolvable ferric salt through electrolysis, and the total phosphorus concentration in raw water is reduced under the actions of precipitation, flocculation and floatation.
The electrolytic dephosphorization device changes the positive electrode and the negative electrode once within 3-12 hours, on one hand, the passivation of the electrode plate of one electrode is prevented, and on the other hand, the use and the replacement period are prolonged. The electrolytic dephosphorization device is powered by solar energy, and the solar photovoltaic panel directly converts solar radiation energy into electric energy by utilizing photoelectric effect.
Solar photovoltaic panels are of length by width (800 by 600mm to 2000 by 1000 mm) and consist of one or more pieces. The solar photovoltaic panel is placed above the device facing the location where the solar radiation is strongest. The solar photovoltaic panel is connected with the energy accumulator, and the converted electric energy is stored in the energy accumulator so as to ensure that the current is output under the condition of voltage stabilization. The parameters of the energy accumulator are 12V 24AH-12V 250AH, and the energy accumulator is connected with a time relay and can adjust the power supply time. Power supply time, normally open: 6:00-23:00, intermittently starting: 23:00-6:00, and supplying power for 5-10min every 1 h. The power supply time is set according to the characteristic of small water consumption in daily evening in rural areas, and the electric energy of the energy accumulator is saved. The time relay is connected with an electrolytic phosphorus removing device.
In the two processes, the gravity type gas-water double backwashing biological filter device is provided with a filler layer as shown in fig. 1. The gravity type gas-water double backwashing biological filter device is mainly used for filtering solid-liquid separation without single water body, and is also used as a permeable separation type biological membrane carrier. The packing layer separates the cavity of the gravity type air-water dual backwashing biological filtering device to form a water inlet cavity at the upper part and a water outlet cavity at the lower part, the water inlet cavity is communicated with the water outlet of the aerobic zone, and the water outlet cavity is communicated with the atmosphere. The water outlet cavity is internally provided with a backwash aeration pipe, the water inlet cavity is provided with a backwash water outlet, and the backwash water outlet is connected with the solid-liquid separation tank. The water flowing in from the aerobic zone passes through the fixed packed bed under the action of gravity, and the SS in the water is removed by layer-by-layer filtration of the fixed packed bed. With the increase of the filtered water quantity, a biological film is gradually formed on the fixed packed bed, so that pollutants such as COD, ammonia nitrogen, total phosphorus and the like in the water can be further removed.
The gravity type air-water double backwashing biological filter device does not need to be provided with a water pump or a backwashing pump to provide power. Gravity self-flowing filtration is adopted, double backwashing is carried out by means of desorption and air water extrusion, an air pump is directly shared with the aerobic zone, and the backwash water is discharged in a gas stripping mode without extra power consumption.
For two process options: when the total nitrogen requirement of the effluent is less than 20mg/L, selecting an A/O process shown in figure 2; when the total nitrogen requirement of the effluent is low or no, the SND process shown in FIG. 3 is selected. For example, when the total nitrogen requirement of the effluent is low or no, the a/O process may be switched to the SND process, i.e., the anoxic zone + aerobic zone is changed to the SND zone.
The A/O process and the SND process have the following treatment effects on pollutants:
the design indexes of the inflow pollutants are as follows: ss=220 mg/L; cod=400 mg/L; bod5=200 mg/L; NH (NH) 4 + -N＝40mg/L；TN＝50mg/L；TP＝5mg/L。
After the system is operated, the SS of the effluent is stably lower than 10mg/L; the COD of the effluent is stably lower than 50mg/L; the BOD5 of the effluent is stably lower than 20mg/L; the NH4 < + > -N of the effluent is stably lower than 5mg/L; the TN (A/O process) of the effluent is stably lower than 20mg/L; effluent TP is stably lower than 1mg/L.
The A/O or SND process is a mode of combining electrolytic dephosphorization with biochemical dephosphorization, and the traditional electrolytic dephosphorization is used as a comparison, and the dephosphorization effect is shown in the following table 1, so that the process has a better dephosphorization effect, and the phosphorus removal rate in sewage is not lower than 80%.
TABLE 1
By using the sewage in the two processes as a control without being treated by the gravity type air-water dual backwashing biological filter device, the sewage treatment effect of the process is analyzed, and as shown in the following table 2, the SS, COD, TP content in raw water is obviously reduced after the sewage is further purified by the gravity type air-water dual backwashing biological filter device in the process.
TABLE 2
In addition, in the prior art, such as rural sewage integrated treatment equipment and method based on a distributed monitoring system, the technology adopts an MBR (membrane biological reactor) membrane, the required power is high, if solar energy is adopted, the power supply of the equipment cannot be met, the equipment technology is complex, the cost is high, and operation and maintenance personnel need higher professional literacy and are not suitable for agricultural sewage treatment.
In addition, the technology of the prior art, such as a rural decentralized domestic sewage treatment technology and a treatment system for strengthening phosphorus removal and recovery, is A2/O+sand filtration, and is mainly based on modified materials for adsorbing phosphorus.
The invention adopts a solar power supply system to carry out electrolytic dephosphorization, aerobic aeration and the like, the process is a solid-liquid separation zone, a biochemical zone and a gravity type gas-water dual backwashing biological filter device, and the biochemical zone can select an A/O process or an SND process according to different water outlet requirements. The method adopts the mode of electrolytic dephosphorization and subsequent biochemical dephosphorization to remove phosphorus, and the electric energy and the like required by the electrolysis dephosphorization and aeration in the process are provided by solar energy, so that the electric energy is saved. The gravity type gas-water double backwashing biological filter device not only can remove SS, but also can further remove pollutants such as COD, ammonia nitrogen and the like in water. The process has the advantages of wide application range, simple process, less mud production, low cost, simple operation and maintenance and no need of professional operation and maintenance personnel. Compared with the existing sewage treatment mode, the method is more suitable for treating rural decentralized sewage.
The invention relates to a solar electrolytic dephosphorization and biochemical region (A/O process or SND process) +gravity type gas-water dual backwashing biological filtration process, which is a rural sewage treatment process with low cost, low carbonization, yi Yunwei, less mud production, unattended operation and good water outlet effect. And the biochemical area process can be switched for different effluent standards of total nitrogen.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. The rural sewage treatment system powered by solar energy is characterized by comprising a solid-liquid separation area for pretreatment of raw water, wherein the drainage end of the solid-liquid separation area is sequentially connected with an anoxic area and an aerobic area; the drainage end of the solid-liquid separation zone is also connected with an SND zone, and the anoxic zone, the aerobic zone and the SND zone are arranged in parallel; the drainage ends of the aerobic zone and the SND zone are connected with a gravity type air-water double backwashing biological filter device; the solid-liquid separation zone is provided with an electrolytic dephosphorization device, the aerobic zone and the SND zone are both provided with an aeration device, and the electrolytic dephosphorization device and the aeration device are connected with solar equipment.
2. The solar powered rural sewage treatment system according to claim 1, wherein the electrolytic dephosphorization device is a double-iron electrolytic plate or a double-aluminum electrolytic plate or an aluminum-iron electrolytic plate; the electrolytic plates are two rectangular plates with the same size, and the plate spacing is 5-40 mm.
3. The solar powered rural sewage treatment system according to claim 1, wherein the power supply voltage of the electrolytic dephosphorization device is 5-30V direct current voltage.
4. The rural sewage treatment system powered by solar energy according to claim 1, wherein the solar energy equipment comprises a solar photovoltaic panel and an energy accumulator connected with the solar photovoltaic panel, and the energy accumulator is also connected with a time relay, and the time relay is connected with an electrolytic dephosphorization device and an aeration device.
5. The rural sewage treatment system powered by solar energy according to claim 1, wherein the gravity type air-water double backwashing biological filtering device comprises a water inlet cavity and a water outlet cavity, and the water inlet cavity is communicated with the bottom of the water outlet cavity; a packed bed is fixed in the water inlet cavity; the water inlet cavity is provided with a water inlet, and the water inlet is connected with the aerobic zone or the SND zone; the water outlet cavity is provided with a water outlet.
6. The rural sewage treatment system powered by solar energy according to claim 5, wherein the filler is a polyurethane sponge cube, and the filling rate of the filler in the water inlet cavity is 10-70%.
7. A solar powered rural sewage treatment method, characterized in that the method is implemented based on the solar powered rural sewage treatment system according to any one of claims 1-6.
8. The solar powered rural sewage treatment method as claimed in claim 7, comprising the steps of:
1) Treating raw water by a solid-liquid separation area, and collecting mixed liquid separated by solid-liquid separation;
2) The mixed liquid of solid-liquid separation is treated as follows:
a) The mixed liquor after solid-liquid separation flows into an anoxic zone for denitrification treatment, the mixed liquor after denitrification treatment flows into an aerobic zone for nitrification reaction, the mixed liquor after digestion reaction flows into a gravity type gas-water dual backwashing biological filter device for treatment, and effluent is discharged after disinfection;
or b) the mixed liquid of solid-liquid separation flows into an SND zone for synchronous nitrification and denitrification treatment, the mixed liquid treated by the SND zone flows into a gravity type gas-water dual backwashing biological filter for treatment, and the effluent is discharged after disinfection.
9. The rural sewage treatment method powered by solar energy according to claim 8, wherein the effluent water treated by the gravity type gas-water dual backwashing biological filtering device flows back to the solid-liquid separation area for purification treatment; and (3) refluxing the effluent treated by the aerobic zone into an anoxic zone and then purifying.
10. The rural sewage treatment method powered by solar energy according to claim 8, wherein the solid-liquid separation area is internally provided with an electrolytic phosphorus removing device, and the electrolytic phosphorus removing device is used for exchanging the anode and the cathode of the electrolytic plate once every 3-12 hours; the aeration device of the aerobic zone is intermittent aeration, and the intermittent aeration period is controlled by a time relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310224299.8A CN116161791A (en) | 2023-03-09 | 2023-03-09 | Rural sewage treatment system and method powered by solar energy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310224299.8A CN116161791A (en) | 2023-03-09 | 2023-03-09 | Rural sewage treatment system and method powered by solar energy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116161791A true CN116161791A (en) | 2023-05-26 |
Family
ID=86416406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310224299.8A Pending CN116161791A (en) | 2023-03-09 | 2023-03-09 | Rural sewage treatment system and method powered by solar energy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116161791A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050099281A (en) * | 2004-04-09 | 2005-10-13 | 이병헌 | Advanced wastewater treatment system with electrolysis of sidestream |
| CN207986978U (en) * | 2018-01-22 | 2018-10-19 | 云南合续环境科技有限公司 | A kind of synchronous nitration and denitrification sewage-treatment plant |
| CN209778435U (en) * | 2019-03-29 | 2019-12-13 | 深圳合续科技开发有限公司 | A biofiltration device for sewage treatment system |
| CN212076748U (en) * | 2019-12-23 | 2020-12-04 | 赣州广安建设工程有限公司 | AAO + BAF sewage treatment system |
| CN213977347U (en) * | 2020-11-12 | 2021-08-17 | 成都东丽科技有限公司 | Device system for rural sewage treatment |
| CN214457451U (en) * | 2020-09-15 | 2021-10-22 | 南昌中节能环境科技有限责任公司 | Integrated EC-AO-MBR water treatment equipment |
| CN216737997U (en) * | 2022-02-10 | 2022-06-14 | 深圳市尚源科技设备有限公司 | Bury sewage treatment device with high-efficient backward flow integral type |
-
2023
- 2023-03-09 CN CN202310224299.8A patent/CN116161791A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050099281A (en) * | 2004-04-09 | 2005-10-13 | 이병헌 | Advanced wastewater treatment system with electrolysis of sidestream |
| CN207986978U (en) * | 2018-01-22 | 2018-10-19 | 云南合续环境科技有限公司 | A kind of synchronous nitration and denitrification sewage-treatment plant |
| CN209778435U (en) * | 2019-03-29 | 2019-12-13 | 深圳合续科技开发有限公司 | A biofiltration device for sewage treatment system |
| CN212076748U (en) * | 2019-12-23 | 2020-12-04 | 赣州广安建设工程有限公司 | AAO + BAF sewage treatment system |
| CN214457451U (en) * | 2020-09-15 | 2021-10-22 | 南昌中节能环境科技有限责任公司 | Integrated EC-AO-MBR water treatment equipment |
| CN213977347U (en) * | 2020-11-12 | 2021-08-17 | 成都东丽科技有限公司 | Device system for rural sewage treatment |
| CN216737997U (en) * | 2022-02-10 | 2022-06-14 | 深圳市尚源科技设备有限公司 | Bury sewage treatment device with high-efficient backward flow integral type |
Non-Patent Citations (1)
| Title |
|---|
| 孙飞云等: "《矿井水处理技术及标准规范实用手册上》", 31 January 2022, 哈尔滨工业大学出版社, pages: 315 - 316 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102153233B (en) | Treatment method and treatment system for percolate in garbage-burning plant | |
| CN110156146B (en) | Biological membrane electrochemical reactor for simultaneously removing nitric acid nitrogen and trace organic matters in water | |
| CN105481208B (en) | A kind of high-efficiency sewage treatment process and device based on electron stream orientation regulation and control | |
| CN109928584B (en) | Method for simultaneously removing nitric acid nitrogen and trace organic matters in water | |
| CN109052870A (en) | domestic sewage processing system and method | |
| CN114084998A (en) | Rubbish transfer station waste water and domestic sewage cooperative processing system | |
| CN104556561A (en) | Microbial fuel cell and intermittent aerated biofilter coupled compound system and sewage treatment method thereof | |
| CN111925044B (en) | Sequencing batch biofilm-electrolysis treatment and recycling device and method for domestic sewage | |
| CN207259324U (en) | Three-diemsnional electrode A/O integral type BAF Treated sewage reusing devices | |
| WO2022082954A1 (en) | System and method for treating preparation wastewater by using multi-phase multi-dimensional electrolysis pretreatment process+a/o+mbr | |
| CN113336314A (en) | A/O-electric flocculation integrated treatment system and process | |
| CN109336328A (en) | A kind of bioelectrochemistry synchronous denitrification dephosphorizing devices and methods therefor | |
| CN103241911B (en) | Treatment device for tobacco sheet production wastewater | |
| CN102249409A (en) | Device and method for strengthening treatment of anaerobic sewage by using solar energy | |
| CN203781882U (en) | Oxidation-flocculation complex bed device for landfill leachate | |
| CN217103411U (en) | Mobile photoelectric complementary sewage deep purification system | |
| CN214457451U (en) | Integrated EC-AO-MBR water treatment equipment | |
| CN116161791A (en) | Rural sewage treatment system and method powered by solar energy | |
| JP2002307065A (en) | Domestic wastewater reutilization equipment | |
| CN211813971U (en) | Rural sewage integrated device | |
| CN211111600U (en) | Purification device is handled in landfill leachate integration | |
| Yu et al. | Evaluation of bipolar electrocoagulation applied to biofiltration for phosphorus removal | |
| CN209815897U (en) | Mineralized nitrogen and phosphorus removal and sludge reduction and ecological filter tank coupling treatment equipment | |
| CN210595684U (en) | Leachate treatment integrated equipment | |
| CN210176667U (en) | Novel comprehensive phosphorus removal treatment system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |