113results about How to "Extended backwash cycle" patented technology

The invention provides a slurry-bed loop reactor, comprising an ascending pipe and at least one downtake pipe 3, wherein, the ascending pipe consists of a reaction zone 1 and a settlement zone 2 with an expanded pipe diameter; an exhaust port 13 is arranged on the top of the settlement zone 2; the inside of each downtake pipe 3 is divided into a filtrate zone 5 and a slurry zone 6 by a filter medium 4, wherein, the filtrate zone 5 is communicated with a liquid discharge port 10; two ends of the slurry zone 6 are communicated with two ends of the ascending pipe 1, so the settlement zone 2 is separated into a steady flow zone 19 and a turbulent flow zone 20, wherein, the upper part of the steady flow zone 19 is communicated with the downtake pipe 3 through a pipeline 16; and the bottom of the steady zone 19 is directly communicated with the reaction zone 1 through an open pore 18 or through a draft tube 17. The slurry-bed loop reactor provided by the invention can realize continuous high-efficiency separation of solid catalyst particles, a liquid product and reacting gas, realize continuous discharging of a gas phase, a liquid phase and a solid phase, reduce turbulence of rising slurry from the reaction zone to settling particles in the settlement zone by separating the settlement zone into the turbulent flow zone and the steady flow zone, improve the separation efficiency of the settlement zone, and reduce the filtering load of the downtake pipe, thereby improving the treating capacity and the separation efficiency of the whole reactor, and prolonging the backsurge period.

The invention discloses a livestock and poultry breeding wastewater treating technology and belongs to the technical field of treatment of livestock and poultry breeding waste. The method comprises the following steps of gravity sedimentation pretreatment, flocculation treatment, special ultrafiltration treatment, nanofiltration treatment, reverse osmosis treatment and aeration biological filter treatment. The membrane technology is used as the core, and a whole set of complete-process technology, which has the good separation and removal effect on organic matter, nitrogen, phosphorus and the like in livestock and poultry breeding wastewater, makes the processed waste water reach the pollution discharge standards in livestock and poultry breeding industry, and is wide in application range and suitable for livestock and poultry breeding wastewater zero discharge of various feces removal, is provided, wherein effluent can be recycled for washing hog houses, pig farm landscape water and toilets and the like.

The invention discloses a method for clarifying a mixed water body containing algae and sand. Firstly, inorganic flocculating agent is added into the mixed water body containing the algae and the sand, and is evenly mixed through a pipeline mixer to generate flocculation, then organic flocculating agent is added after a plurality of small flocculating conglomerations are produced, and is evenly mixed through the pipeline mixer to form a coagulated water body containing large flocculating conglomerations, wherein, the adding amount of the inorganic flocculating agent is 0.0005 to 0.0100 percent of the weight of the water body, and the adding amount of the organic flocculating agent is 0.0001 to 0.0030 percent of the weight of the water body. Then the coagulated water body is drawn into a single-segment sedimentation pond for sedimentation treatment, and water overflows from the upper layer of the sedimentation pond, enters a fine filter chamber, and passes through a quartz sand and anthracite filtering layer for fine filtration treatment, thereby obtaining clear water with SS less than or equal to 5mg / L and a turbidity less than or equal to 1.

The invention discloses real-time control device and method for the deep denitrification and dephosphorization of an A2 / O-BAF (Biological Aerated Filter) process. The A2 / O-BAF real-time control device mainly comprises a raw water tank (1), an A2 / O reactor (2), a secondary sedimentation tank (3), a BAF reactor (4) and a real-time control system (5). The real-time control method comprises the following steps of: collecting the concentrations of ammonia and nitrogen in a water outlet tank on line and obtaining a real-time control variable through the operation of a computer; adjusting the aeration amount of an air pump through a stroke controller; collecting the concentration of nitrate nitrogen in the water outlet tank on line and obtaining a real-time control variable through the operationof the computer; adjusting the reflux ratio of a peristaltic pump through the stroke controller; collecting the concentration of TP in the water outlet tank on line and obtaining a real-time control variable through the operation of the computer; and adjusting the reflux ratio of the peristaltic pump through the stroke controller. The invention overcomes the limitations of a traditional biological phosphorus and nitrogen removal process of sewage and is one of the most effective methods for the synchronous phosphorus and nitrogen removal of C / N sewage.

The invention discloses a down-flow biological aerated filter with double-layer filter media and a method to apply the filter for the processing of raw water. The filter is characterized in that a large-particle filter layer, a small-particle filter layer and a gravel layer are arranged in order below a backwash effluent groove in the biological aerated filter; processing aeration devices are arranged in the gravel layer; the particle size of filter media at the large-particle filter layer is from eight to sixteen mm with a smaller filter media density than the small-particle filter layer; the particle size of filter media at the lower small-particle filter layer is from four to eight mm. For the method, raw water enters into the filter through a water distribution channel, flows downward through the lightweight large-particle filter layer and small-particle filter layer and the gravel layer, and flows out through a filter head arranged at a filter plate. The down-flow biological aerated filter with double-layer filter media has the advantages of small water head loss and long backwash cycle, is a economical and efficient method in the biological pretreatment technology for micro-biological polluted drinking water sources.

The invention discloses a method for controlling automatic flocculant addition, which belongs to the field of sewage treatment. A feedback control system determines the flow of sewage and the concentration of TP and SS after sewage treatment and feeds back determination results to a PLC control system; and the PLC control system performs calculation by using undetermined parameters through a formula as follows: delta X dosage=k*Q*L*(P-1.1A)a*(S-1.05B)b / (lambda*N)according to the feedback of the feedback control system of the flow, the TP and the SS to indirectly determine the dosage of flocculant. The invention can regulate the dosage of the flocculant in time according to the coagulation effect of the sewage treatment and ensure the optimal dosage of the flocculant and the effect of the sewage treatment.

The invention discloses a combined type two-stage biological aerated filter and a wastewater treatment process based on the same. The combined type two-stage biological aerated filter is suitable for buried integral wastewater treatment equipment for rural domestic wastewater and is characterized in that a main filter body is in a steel tank shape, a primary-stage biological aerated filter filled with suspended filler is arranged in the center of a tank body, wastewater is aerated while entering the primary-stage biological aerated filter, carbonization and ammonization of wastewater part and SS (suspended solid) removal are realized, a second-stage biological aerated filter filled with a sodium citrate modified zeolite filter material and a third-stage biological aerated filter are arranged on the periphery of a central filter column; the second-stage biological aerated filter is controlled in dissolved oxygen concentration, synchronous nitration and denitrification are realized, finally, organic matters in the wastewater are further oxidized through the third-stage biological aerated filter, and quality of effluent is improved; the three biological aerated filters are equipped with independent backwashing devices, and backwashing at different frequency and different intensity can be performed independently; carbonization, nitration and denitrification reactions can be completed simultaneously, and decarburization efficiency and denitrification efficiency of the biological aerated filters are improved.

The invention relates to an advanced treatment system for municipal domestic wastewater, and in particular relates to an advanced treatment system and method for municipal domestic wastewater. The advanced treatment system for the municipal domestic wastewater comprises a water inlet pipe and a water outlet pipe, as well as a composite lift bed bio-membrane reactor, a flocculation reactor, a compression type filtering material filter, a chemical dosing device and an aerating apparatus, wherein the aerating apparatus is used for ventilating the composite lift bed bio-membrane reactor, the flocculation reactor and the compression type filtering material filter. According to the advanced treatment system for the municipal domestic wastewater, the treatment effect can be improved; the technological process and the structure arrangement are simplified; the management and operation strength is reduced; and the floor area and the operation cost are reduced.

The invention relates to an integrated A / O bacteria filter device for treating dispersed wastewater, which has a cylindrical structure in shape. The center of the integrated A / O bacteria filter device is provided with a cylindrical erect flow primary settling tank, a baffle wall is arranged between an inner cylinder body and an outer cylinder body, and a space is divided into an adjusting tank, a hypoxia bacteria filter, an aerobe filter, a clear water tank and a mud storage tank. The aerobe filter and the clear water tank are in a concentric circle arc structure. Wastewater in the adjusting tank is lifted into the primary settling tank through an air lifter, the settled wastewater and recycled nitrification liquor are together distributed into the hypoxia bacteria filter for denitrification, the bottom and the middle part of the hypoxia bacteria filter are provided with backwashing pipelines which can realize subsection washing; the hypoxia bacteria filter is communicated with the bottom of the aerobe filter, the denitrified wastewater overflows from the surface into the clear water tank for outputting after organic matters are removed and nitrification is carried out in the aerobe filter. The backwashing wastewater of the device flows into the adjusting tank per se, and mud in the primary settling tank is lifted into the mud storage tank through the air lifter. The invention has the advantages of less investment, little operation cost, longer mud discharge period and convenient management, thereby being suitable for treating the dispersed wastewater in countryside.

The invention relates to a vertical-flow type settling pond for sewage treatment, comprising a water feeding area, a water feeding pipe, an overhaul area, a water collecting area, a filtering area, a settling area, a sludge collecting area and a water discharging pipe. The water feeding area extends from the top of the settling pond into the lower part of the settling pond, the water feeding area is provided with the water feeding pipe, the overhaul area, the water collecting area, the filtering area and the settling area are sequentially arranged around the water feeding area from the top down, the sludge collecting area is communicated with the lower part of the settling area, a water collector which can be regulated according to the water level is arranged in the water collecting area, and the water collector is communicated with the water discharging pipe; and the water collecting area further comprises a filtering water buffering section arranged at the lower part of the water collector. Due to the existence of the filtering water buffering section, water after filtered in the filtering area firstly enters into the filtering water buffering section to be buffered and then enters into the water collector, thus the uniform water discharge at an water discharge part still can be ensured due to the action of the filtering water buffering section even though filtering materials or biological fillers are aggregated.

The invention discloses an inner-loop three-phase biological fluidized bed type membrane bioreactor (MBR). The reactor comprises an inner-loop fluidization region and an MBR membrane bioreaction region, wherein the bottom of the inner-loop fluidization region is communicated with a water inlet pipe; the inner-loop fluidization region comprises an internal cylinder and an external cylinder sleeving the internal cylinder; a gap serving as a downstream area is formed between the internal cylinder and the external cylinder; the internal cylinder is provided with a channel serving as an upstream area; an air-blast system for driving water to rise along the upstream area is arranged inside or at the bottom of the internal cylinder; a packing is arranged in or at the bottom of the internal cylinder; an MBR membrane component is mounted in the MBR membrane bioreaction region; an aerator pipe is arranged at the bottom of the MBR membrane component; the water outlet of the MBR membrane component is communicated with a water producing pipe. The inner-loop three-phase biological fluidized bed is combined with the MBR to form the inner-loop three-phase biological fluidized bed type MBR which is reasonable in spatial arrangement, and therefore, the energy consumption can be further reduced; in addition to treating domestic sewage, the inner-loop three-phase biological fluidized bed type MBR is further capable of treating industrial wastewater in the fields of printing and dyeing process, oils and fats, food, leather and the like.

Belonging to the technical field of biological sewage treatment, the invention relates to a method for deep denitrification of an integrated biological aerated filter, and the method is suitable for deep denitrification of sewage and wastewater. A device for deep denitrification of the integrated biological aerated filter mainly comprises: a water inlet system, the integrated biological aerated filter, a carbon source adding system and a back washing system. The integrated biological aerated filter adopts an upward flow operation mode, and is divided into a nitrification area and a denitrification area through a gas-water separator. The method includes: subjecting nitrogen-containing sewage and wastewater to ammonia nitrogen oxidation by the nitrification area at the lower part of the biological aerated filter; passing the gas through an intermediate water layer, then conducting separation and discharge; and making use of the electronic donor provided by an external carbon source in the denitrification area to complete deep removal of nitrogen. The device has a small floor area and a simple process, and is easy to form integrated equipment.

The invention relates to a combined set for treating a micro-polluted source water in counties and towns, and the combined set comprises an inclined tube sedimentation tank, an aeration biozeolite filter column and an activated carbon filter column, wherein the inclined tube sedimentation tank consists of a water inlet region, a sloped tube region and a water collection region, the water inlet region is provided with turbulent stones and a baffle, the water collection region discharges water through a perforated water collection tank, the aeration biozeolite filter column consists of a water / gas inlet region, a filter material region and a water collection region, aeration is carried out in a blast aeration mode, gas is mixed in the water inlet region and enters the filter material region through a long-handle filter head, the filter material consists of coarse-grain zeolite and common-grain zeolite, the effluent water of the aeration biozeolite filter column enters the activated carbon column in a hydraulic drop mode, and the activated carbon filter column consists of a filter material region and a water outlet region. The inclined tube sedimentation tank water inlet region is provided with the turbulent stones and baffle to enhance the flocculation effect of the coagulant and the removal effect of the sedimentation tank. The activated carbon filter column connected to the aeration biozeolite filter column performs a two-stage biochemical synergistic action, and implements advantage complementation, thereby enhancing the water quality of the effluent water and lowering the treatment cost. The combined set can effectively remove ammonia nitrogen, organic substances, manganese and other pollutants in the micro-polluted source water, has the advantages of compact technical linkage, low investment and operating cost and stable quality of effluent water, and is suitable for being used in small-scale water generation occasions, such as water supply to counties and towns.

The invention discloses a method for treating water of a polluted water source by using a double-stage aeration bio-filter, which relates to a method for treating the water of the polluted water source. The method solves the problems of easy blockage, easy production of secondary pollution and poor removal effect in the conventional method for treating the water of the polluted water source by using an aeration bio-filter process. The method comprises the following steps: allowing the water of the polluted water source to be treated to enter the double-stage aeration bio-filter, making the water flow upwards and aerating at the same time, controlling the hydraulic retention time so as to realize the treatment for the water of the polluted water source. When the water of the polluted water source is treated and the lightweight carrier of the lower stage is in a fluidized state, organic substances and intercepted suspensions can be efficiently removed, so the problem that the filler of the upper stage is easy to block due to small grain diameter is solved; meanwhile, because the natural clinoptilolite at the upper stage has large specific surface area, the removal rate of ammonia nitrogen is high, and the purpose of efficiently removing the ammonia nitrogen and the organic substances at the same time can be achieved; and moreover, the back flushing period is long and the secondary pollution cannot be caused.

The invention relates to water conditioning constructional work in a water purification plant and particularly relates to an air-flotation and membrane-filtration purification system which is divided into a water buffering region, a water distribution region, an air-flotation contact region and an air-flotation separation and membrane-filtration water outlet region, wherein a micro-bubble generating device and a gas-solublized water conveying pipeline are connected and distributed in the air-flotation contact region; the air-flotation separation and membrane-filtration water outlet region is provided with a conical mud bucket, a supporting beam and an immersed membrane module from bottom to top; a slag scraping machine is capable of walking on a guide rail distributed on the side wall of a pool; a slagging groove is formed on a side wall opposite to the water inlet of the pool. The air-flotation and membrane-filtration purification system has the advantages of organically combining an air-flotation process with an ultrafiltration membrane filtration process, being capable of treating low-turbidity or high-algae water, and meanwhile being small in occupied space, simple in structure, low in civil engineering construction cost, high in load resistance capacity, low in auxiliary water ratio, low in operating cost and simple in automatic control.

The invention provides integrated sewage treatment equipment, which comprises an anoxic tank, an anaerobic tank, an aerobic tank, a sedimentation tank and a membrane reaction tank communicated sequentially from front to back, wherein an MBR membrane is arranged in the membrane reaction tank and communicated with an ultraviolet disinfector; aeration equipment is communicated with both the aerobic tank and the MBR membrane; an elastic filler is uniformly distributed in the anaerobic tank and an MBBR filler is arranged in the aerobic tank; a mixer is arranged in the anoxic pool, a carbon source adding device is communicated with the anoxic pool, and a medicine dosing barrel is communicated with the aerobic tank. Compared with the traditional sewage treatment device, the continuous aeration ofthe integrated sewage treatment equipment enables a moving bed in a flowing state and react more fully with the sewage, which greatly improves the treatment efficiency. The sedimentation tank is designed in front of the membrane reaction tank to separate the mud and water and remove the floating sludge, so that most of the mud is precipitated before entering the membrane area, thereby reducing the operating load of the MBR membrane, reducing the probability of fouling, delaying the service life of the membrane, also prolonging the backwashing cycle of the membrane and further ensuring the quality of the effluent.

The invention relates to a metallic filter membrane which can be used in flat filtration, cylinder filtration and folded filtration, etc. Said preparing method uses following materials: nickel, titanium, chrome, stainless steel, molybdenum, cobalt, iron, and copper, etc, that using the powder of one said material or the alloy powder to be mixed with adhesive to be plated on the frameworks (alloy porous base band or spongy base band with same characters of powder) to be sintered. The invention can prepare the filter membrane whose diameter in 0.1 nanometers to 5 micrometers according to the different granularities of powder, with the characters of high-temperature resistance, acid alkali resistance, large flux, small volume, and long service life.

The invention relates to a domestic sewage treatment system, which includes a grid, a regulating tank, an anoxic tank, an aerobic tank, a precipitation tank and a disinfection tank. The input end of the grid is connected to the input end of the regulating tank, the output end of the regulating pool is connected to the input end of the anoxic tank, the output end of the anoxic tank is connected to the input end of the aerobic tank, the output end of the aerobic tank is connected to the input end of the precipitation tank, and the output end of the precipitation tank is connected to the input end of the disinfection tank. The domestic sewage treatment system provided by the invention has the characteristics of good treatment effect and good effluent water quality.

The invention provides a pretreating method of controlling algae pollution of ultra filtration membrane by potassium permanganate and chlorine, simultaneously casting two oxidants of potassium permanganate and chlorine into the algae containing water of a reservoir in 0.3-2mg / l and 0.2-3mg / l, respectively, quickly mixing and making flocculation reaction for 5-20 min, pumping supernatant into the ultra filtration membrane, and obtaining drinking water by alternating flow filtration of membrane component. And it improves algae removing effect by adsorption and codeposition, thus reducing algae quantity entering the ultra filtration membrane and effectively controlling algae pollution of ultra filtration membrane. And it can control frequency of chemically cleaning ultra filtration membrane and effectively prolong the service life of ultra filtration membrane.

The invention relates to an improved gas-water mixed backwash structure of an aeration biological filter chamber. The clear water in a clear water pool (8) is pumped out by a pressurizing water pump (12) and is led to the bottom of a chamber body (1) through a water distributing pipe net (13), then the clear water passes through a filter material (7) from bottom to top so as to take filter residue (15); then the water enters into a backwash water collecting groove (4) through a sieve (17); the sewage flows to a sewage pool (9) through a water drainage pipeline (6); the upward side of the backwash water collecting groove (4) is provided with a through length supporting lever (16); the sieve (17) encases the backwash water collecting groove (4) and the supporting lever (16) so as to ensure that the filter bed restores the function of filtering and purifying the sewage, prolongs the backwash period and reduces the backwash frequency, as well as ensure that the sewage purifying system canbe better and normally operated; the sieve has simple mounting and dismounting, less material consumption and convenient maintenance.

The invention discloses an aerating apparatus which comprises a molding body consisting of a porous material containing silicon sand, wherein the molding body internally comprises a cavity, and the porous material has a micropore diameter of 100-480 micrometers and a porosity of 5-10 percent. The aerating apparatus provided by the invention has functions of aerating and washing, and overcomes theproblems of easy surface blockage and short backwashing period of the aerating apparatus of the prior art. In addition, the aerating apparatus provided by the invention has a simple manufacture process and low cost, and can realize continuous operation of sewage treatment.

The invention discloses a method for treating micro-polluted source water by using a biodegradation flocculation reaction tank, belonging to the technical field of water treatment. The method comprises the concrete steps of (1) enabling micro-polluted source water to enter a mixing tank, adding a coagulant, uniformly mixing, and reacting for 10-30s; (2) enabling effluent of the mixing tank to enter a biodegradation flocculation reaction tank so as to be treated, and reacting for 15-25min; (3) enabling effluent of the biodegradation flocculation reaction tank to enter a sedimentation tank so as to be subjected to solid-liquid separation; (4) enabling effluent of the sedimentation tank to sequentially enter a filter tank and a disinfecting tank and finally enter a water supply network after the water quality is casually inspected to be up to the standard. The method has the beneficial effects that a packing layer in the biodegradation flocculation reaction tank rotates along with a driving shaft to ensure that a biofilm formed by attached microorganisms is in repeated contact with micro-polluted source water, so that low-molecular weight organic matters and ammonia nitrogen in water are degraded, the flocculation efficiency is increased, and the water quality is further improved; in addition, the reaction tank is simple in inner structure, so that the water treatment cost is reduced.

The invention relates to an aeration biological filter pool device and a process for efficiently denitrifying and dephosphorizing in the sewage treatment and provides an aeration biological filter pool device for efficiently denitrifying and dephosphorizing. The aeration biological filter pool device comprises water feeding pumps which are connected and arrayed according to water feeding sequence, a synchronous denitrification dephosphorizing pool for synchronously denitrifying and dephosphorizing water from the water feeding pumps, a settling pond for settling the water from the synchronous denitrification dephosphorizing pool, an aeration biological filter pool water feeding pump and an aeration biological filter pool, wherein the synchronous denitrification dephosphorizing pool adopts a activated sludge process. The invention also provides an aeration biological filter pool process for efficiently denitrifying and dephosphorizing. The invention has the beneficial effects of solving the problems of complicated pretreatment, frequent back flush and insufficient utilization on a raw water carbon source of the conventional aeration biological filter pool, reducing the emission of carbon dioxide, improving the utilization rate of structures and reducing the occupied area and the cost by optimizing a process flow and being beneficial to wide application of the aeration biological filter pool process.

The invention discloses a biological aerated filter with large particle-size and light-weight filter at the surface layer, wherein a filter unit of the biological aerated filter is provided with a support layer (1) and a filtering material layer (2) from bottom to top. The biological aerated filter is characterized in that a large particle-size and light-weight filter layer (3) is arranged at the upper part of the filtering material layer (2). In the biological aerated filter, filtering materials with different particle sizes are adopted, wherein the filtering material with larger particle size is adopted in the support layer, the material with smaller particle size is adopted in a middle layer, and the light-weight filtering material with larger particle size is added in the surface layer. The light-weight filtering material with larger particle size in the surface layer plays a pretreatment role and ensures that not only the biological treatment can be carried out in the surface layer, but also a great deal of SS can be accommodated, thereby reducing the accumulation speed of the SS amount of the filtering material in the middle layer, prolonging the time that the flow volume reaches a critical value and also the backwashing period of the biological filter, improving the efficiency, saving the backwashing water consumption and reducing the operation cost; and the filter has relatively unchanged structure layer position after backwashing, stable water outlet and higher quality.

The invention provides a novel immersion ultrafilter apparatus. The novel immersion ultrafilter apparatus comprises a main body, an outside prefilter unit, a membrane assembly filter unit, a water outlet pipeline and an air pushing unit; the outside prefilter unit is arranged on the sidewall of the main body; the membrane assembly filter unit is arranged in the main body, and is connected with the water outlet pipeline; the air pushing unit is connected with the bottom of the main body; and the bottom of the main body is provided with an air valve, and the bottom of the main body is provided with a waste release valve. The apparatus has the advantages of compact structure, small occupied area, use convenience, flexible operation, low treatment cost, high outlet water quality, wide application range of inlet water, and good popularization application prospect.

A deep treatment method of tannery wastewater comprises the following steps: (1) leading tannery wastewater subjected to biochemical treatment into a coagulating sedimentation tank for enhanced coagulating sedimentation, and controlling SS in the effluent to be less than or equal to 30 mg / L; (3) when the filtration resistance in an activated charcoal adsorption tank rises to the set value, performing gas-water back washing from the bottom to the top; (4) when the concentration of COD in the effluent treated by the activated charcoal adsorption tank exceeds the set value, replacing activated carbon; (5) sequentially performing dewatering, drying, dry distillation and activation on replaced activated carbon to obtain regenerative activated carbon; (6) cleaning the regenerative activated carbon and supplemented new activated carbon together, and then adding the cleaned regenerative activated carbon and new activated carbon into the activated charcoal adsorption tank. The deep treatment method can reduce the concentration of COD entering activated carbon wastewater to reduce the treatment load of the activated charcoal adsorption tank, and after the coagulating sedimentation effluent is subjected to activated charcoal adsorption, the COD removal rate is about 40-70%.

The invention discloses a method for treating rural sewage with an effect of removing phosphate and nitrogen, characterized in that: a preposed anoxic pond is used for denitrification; a preposed biological contact oxidation pond is used for prolonging the backwashing period of a biological aerated filter markedly; in the biological aerated filter, organic matters are removed from water and nitrification or partial denitrification of ammonia nitrogen is realized; and a clear liquid is added in a post biological contact oxidation pond for raising the standards of water treatment. The invention is suitable for rural dispersed pollution discharge points, especially water protection areas having strict requirements on rural sewage discharge, and locations requiring advanced treatment and sewage resource recycling.

The invention relates to a horizontal flow sand filter pool and a water treatment technique thereof. The horizontal flow sand filter pool comprises a pool body, a raw water inlet component, a sand filter bed, a filtered water outlet component, an aeration component and a back washing component, wherein the raw water inlet component comprises a water inlet pipe and a water distribution device used for sending raw water into the sand filter bed; the water inlet pipe is connected with the water distribution device; the water distribution device is arranged in the sand filter bed; a plurality of water outlet pore channels are uniformly distributed on the vertical face of the water distribution device; the filtered water outlet component comprises a water collector and a water outlet pipe; a water inlet pore channel is arranged on one side of the water collector, which is adjacent to the sand filter bed; the water outlet pipe is communicated with the water collector; the back washing component comprises a back washing pipe and a sewage discharge pipe; the back washing pipe is connected with the water outlet pipe; the sewage discharge pipe is connected with the water distribution device. The horizontal flow sand filter pool is large in filtration area, sand grains are washed thoroughly, and water and energy are saved; in addition, extensive application is diversified, so that the horizontal flow sand filter pool can not only be filter equipment simply, but also become an aerobiotic / anoxic biological filter pool integrating functions of biological contact oxidation and suspended matter filter bed interception.

The invention discloses a sewage treatment device, system and method. The sewage treatment device comprises a reaction column, an aerator, a water feeder and a water drainage device, wherein the reaction column is vertically arranged, the water feeder is arranged below the reaction column, the aerator is arranged at the bottom of the reaction column, the water drainage device is arranged above the reaction column, an activated sludge water purification region, a biofilm water purification region and a clear water region are arranged in the reaction column from bottom to top according to a water flow direction sequentially; and a bearing layer with the capabilities of water permeability and sludge isolation is arranged between the activated sludge water purification region and the biofilm water purification region. The sewage treatment system comprises a plurality of sewage treatment devices which are connected in series with one another. The sewage treatment method comprises the following steps: (1) a starting phase, namely, injecting activated sludge into the activated sludge water purification regions of the reaction columns in each sewage treatment device in the sewage treatment system, and carrying out smothering aeration; and (2) a continuous running phase, namely, regulating according to the following principles: the longer the running time is, the larger the water inlet quantity is, and the larger the aeration quantity is. The sewage treatment device, system and method are strong in loading ability, long in backwashing period and low in energy consumption and sludge discharge.

The present invention discloses a biological treatment method for oil extraction waste water with high polymer concentration. According to the method, the waste water flows through a dissolved air flotation unit, a biochemical processing unit, and a quartz sand filtering unit, wherein the biochemical processing unit comprises a biochemical pool and aeromicrobe flora with functions of demulsification and degradation of crude oil, and adopts the aeromicrobe flora to degrade polymers in the oil extraction waste water. The method of the present invention has the following advantages that: the investment running cost is low; the crude oil recovery efficiency is high; the maintenance is simple; the treatment time is short; the effluent is stable; the waste water with the high polymer concentration of 800-1500 mg / L can be treated; and the method is suitable for large-scale application.