55 results about "Slow sand filter" patented technology

A portable water treatment system includes at least one sub-system to treat water including a flocculation system, a chlorination system, and a bio-sand filter system. The water treatment system may include multiple sub-systems for treating water that feed into one another. The sand filter system may include a mini bio-sand filter, a foam filter, or a pressed block filter. The flocculation system may include a tank bottom that urges settling particles toward a sump and a ladle that removes settled particles. A manual pump or siphon may be included in the water treatment system.

This invention relates to a novel intermittent slow sand filter and a method of using the intermittent filter. More particularly, this invention pertains to a novel slow sand filter which remains effective, even when intermittently operated, and which can be periodically cleaned without disturbing the action of the intermittent filter. A slow sand filter apparatus comprising: a container having an upper portion and a lower portion; a water inlet in the upper portion of the container, the water inlet being connected to a supply of water; a filter material filling at least the lower portion of the container, the filter material having a top surface below the water inlet; a schmutzdeuke layer on the top surface of the filter material; a water outlet in the lower portion of the container below the top surface of the filter material; and a water level maintenance device in the upper portion which maintains water in the upper portion of the container at a maintenance level above the top surface of the filter material, the maintenance level being a balance between (1) a water maintenance level that is sufficiently deep that water falling from the water inlet onto the top of the water in the container does not significantly disturb the schmutzdeuke layer; and (2) a water maintenance level that is sufficiently shallow that oxygen from the air above the water level can diffuse through the water and reach the schmutzdeuke layer so that the schmutzdeuke layer is maintained in living condition even when there is no flow of water through the water inlet.

The invention relates to a coking wastewater treatment device which comprises a flocculation reaction tank, wherein the flocculation reaction tank is connected with a flocculation settling pond, the flocculation settling tank is connected with a sand filter, and the sand filter is connected with an active carbon filter. A coking wastewater posttreatment method comprises the steps of: adding an efficient composite flocculating agent, a polymer coagulant aid and a mineral powder absorbing agent into the coking wastewater subjected to common treatment; regulating the pH value to be 8-9 with alkali, wherein the flocculation reaction settling time is 1-2.5h; and then carrying out sand leaching and active carbon filtration, wherein the effluent quality fully reaches the standard for emission or recycling. The COD (Chemical Oxygen Demand), the total phenol, the ammonia nitrogen, SS (Suspended Substances) and the chromaticity in the coking wastewater subjected to the treatment with the method are respectively reduced by above 80 percent, 90 percent, 60 percent, 90 percent and 95 percent; and by treating the coking wastewater according to the invention, the purposes of good effect, simple operation and convenience in management are achieved.

The invention discloses a method for deep dephosphorization of wastewater by using siderite as a sand filter filtering material. The method is characterized by comprising the steps of crushing and screening natural siderite ore to obtain 0.25-0.5mm particles, filling a sand filter by using the particles as filler, and carrying out deep dephosphorization on low-concentration phosphorus wastewater via a filter manner. The principle is that the siderite is slowly oxidized by the dissolved oxygen in the water to form newly born ferrihydrite (iron hydroxide) and the newly born ferrihydrite adsorbs to remove the phosphor in the water. Through regular back washing, the ferrihydrite membranes on the surfaces of the particles fall off, so that the oxidization dephosphorization of the siderite is restored. The method provided by the invention is suitable for the deep dephosphorization of domestic wastewater, landscape water and polluted river water.

The invention is a depth-type sand filter, the size of sand gradually diminishing with the flow direction of the normal filtering fluid. It leads the fluid to the inlet of the sand filter through the pipeline, firstly holds back big suspension through big sand area, then holds back medium suspension through medium sand area, finally eliminates most fine suspension through fine sand area, and then makes the fluid flow out from the outlet. It is composed of wall body, filtering sand and ground leak; the wall body is set with inlet and outlet, the ground leak is set under the wall body, the filtering sand is spread in the liquid flow direction in turn according to the size. It can adopt upflow and downflow modes. It can stably and economically run in a wide range. It is applied to economical sand filtering field, especially the field where the sand filter is used infrequently or discontinuously.

The SSF/x slow sand filter for use in treating drinking water for homes or rural villages with features providing simpler on-site assembly, preset maximum flow, easy monitoring of pressure head loss, protection of piping, and a harrowing system for cleaning. The filter employs a novel hydraulic scheme which places most pipe and plumbing within the filter vessel. The filter employs a novel device that combines flow control, pressure measurement, freeze protection, and anti-siphon features. This in combination with a relatively shallow supernatant level provides for consistent reliable operation, easy maintenance, and reasonably long filter runs as deemed very desirable in remote rural locations.

The invention discloses a silica sand filter for water treatment. The middle of a filter tank is of a cylindrical structure. End enclosures are fixed to the upper end and the lower end of the filter tank respectively. An overflow tube of an L-shaped structure is fixed to the side portion of the filter tank. A lower inlet of the overflow tube is communicated with an inner cavity of the lower portion of the filter tank. The upper end of the overflow tube is communicated with an annular water outlet tube. The annular water outlet tube is arranged on the outer side of the upper portion of the filter tank, and is supported and fastened through an annular tube. An effluent stop plate is arranged at the lower inlet of the overflow tube. A 4-8cm gap is formed between the effluent stop plate and the lower inlet of the overflow tube. The effluent stop plate is fixed to the inner wall of the filter tank through a stop plate support. A water inlet tube is mounted at the top of the filter tank. Aninflow stop plate is arranged under the water inlet tube, and is fixed to the inner wall of the filter tank through a support rod. The silica sand filter has the advantages of high stability, good filtration effect and convenience in use.

The invention discloses a rainwater sustainable collection and purification equipment for highways, which relates to the technical field of rainwater collection, and comprises water collecting ditches arranged on one or both sides of the expressway, and the top of the water collecting ditches is covered with a water ditch cover with filter holes A water collection pipe is laid on the bottom of the inner ditch of the water collection ditch, and several filter holes are evenly arranged on the surface of the water collection pipe. It also includes a sand filter treatment well, multiple grass planting ecological side ditches, and a reservoir. There are three layers of discs with holes in sequence, and the water collection pipes are connected downwards in a stepped manner to the bottom of the discs with holes in the lowest layer. There is a reserved water storage pool outside the sand filter treatment well, which is collected through the water storage pipes to the reserved storage. The rainwater in the pool is sprayed from top to bottom into the sand filter treatment well through the spray pipe and circulation pump. Through the implementation of the technical solution, the problem that the three-layer disc with holes will be blocked due to the self-settling effect of sand and mud for a long time will still cause rainwater to be unable to be discharged or cause secondary pollution to collected rainwater.

The invention relates to a novel water collection and backwashing sand filter. The sand filter comprises a tank body, wherein the upper part and the lower part of the tank body are respectively provided with a water inlet, a vent port, a water outlet and an air inlet, the middle part inside the tank body is a filter material layer, a screen plate is arranged inside the filter material layer, the screen plate is provided with a plurality of filter caps and a homogenizing filter material, a collection chamber is arranged below the screen plate, a water collection air distribution pipe is arranged inside the collection chamber, and the water collection air distribution pipe is communicated with the water outlet and the air inlet. The novel water collection and backwashing filter can thoroughly filter the sand and effectively intercept the fine organic particles, and the filtering efficiency is high; thoroughness in backwashing can be realized, the washing water can be saved, and the processing capacity can be increased; and the flow area of the filter cap is large, and the filter cap is anti-aging, has good pressure resistance and long service life, is hardly damaged, is safe and reliable and has low comprehensive cost; and the floor occupied area is small, rapidness in installation can be achieved, the investment can be saved, and convenience for operation and maintenance can be realized; and the tank bodies are connected in parallel for use, so that convenience for backwashing can be achieved.

The invention discloses an ammonia nitrogen wastewater denitrification treatment method, and solves the troubled problem of incomplete removal of nutrient elements of N, P, etc. in city tail water according to the characteristics of the city tail water. The method is characterized by that ammonia nitrogen wastewater is subjected to a series process of an anoxic denitrification biological filter and an aerobic nitrification biological filter, then is subjected to sedimentation treatment in a mechanical stirring clarification pool, and then is filtered in a sand filter to remove suspended solidsand some bacteria and microorganisms in the water, and the obtained filtrated water is subjected to ultrafiltration reverse osmosis system treatment. According to the method, a combined technology ofdenitrification and dephosphorization of the denitrification-nitrification biological filters, coagulation, disinfection, filtration, ultrafiltration and reverse osmosis is used, and the nitrification process is controlled at a short-term stage through addition of a nitrifying bacteria inhibitor into the nitrification filter, so that the problems that power plant aeration energy consumption is large, carbon source is in insufficient, service life of ultrafiltration membranes and reverse osmosis membranes is short, and the likes are solved, thereby providing a technical support for the economical use of the city tail water by the power plants.

The invention discloses a water distributor for a sand filter and relates to the technical field of sewage disposal. The water distributor comprises a cylindrical water inlet, a connecting bracket, anupper disc, a water distribution tray and a plurality of connecting parts; an internal thread is arranged on an inner wall of the water inlet; the water inlet is connected with the connecting bracketthrough a thread; the connecting bracket is placed on the upper disc; the water distribution tray is arranged under the upper disc; the upper disc is connected with the water distribution tray through the connecting parts; a circular hole is formed on the upper disc; a plurality of circular water-dispersing holes are formed on the water distribution tray. The water distributor for the sand filterdisclosed by the invention has a simple structure, will not be blocked and is capable of flexibly uniform distributing water at different flow rates. All the components are detachably connected and can be conveniently detached and stored.

The invention relates to a drinking water treatment system, which comprises a water inlet lift pump, wherein the water inlet lift pump is connected with an electromagnetic flowmeter; the electromagnetic flowmeter is connected with a pre-ozonation contact tower; the pre-ozonation contact tower is connected with a mixing flocculation settling pond; the mixing flocculation settling pond is connected with a sand filter; the sand filter is connected with a disinfection pond; a sand filter water lift pond is mounted below the disinfection pond. The drinking water treatment system has the benefits that the cost is low, and the effect of removal of organic substances and particles is excellent.

The invention provides an oil sand filter easy to clean. The oil sand filter comprises a barrel, a head cover and a filter cylinder arranged in the barrel; a cleaning opening with a bottom cover is formed in the bottom of the barrel, an annular lapping plate is fixedly arranged on the inner side wall of the barrel, the filter cylinder is connected to the lapping plate in a lapping mode, a filter cylinder cover is arranged at the top end of the filter cylinder, the side wall, the bottom and the filter cylinder cover of the filter cylinder are made of filter screens with filtration pores, and the filtration pores of the filter cylinder cover is smaller than those of the filter cylinder. The oil sand filter easy to clean has the advantages of being simple in structure, good in sand filtering effect, not prone to block the filter screens and capable of cleaning the filter screens.

The invention discloses a quartz-sand filter for deep treatment of sewage. The quartz-sand filter comprises a filter body, an upper sealing head, a lower sealing head, an upper manhole and a lower manhole, a water inlet and a water outlet, wherein the upper sealing head and the lower sealing head are arranged at the top part and the bottom part of the filter body in sequence; the upper manhole andthe lower manhole are respectively arranged at the top parts of the upper sealing head and the lower sealing head; the water inlet is arranged in the top part of the left side of the filter body andthe water outlet is arranged in the bottom part of the lower manhole; a water distributor is connected at the right side of the water inlet; a plurality of water leaking holes are uniformly opened inthe bottom part of the water distributor, and a coarse filtering net is arranged at the bottom part of the water distributor; a quartz-sand layer is arranged under the water distributor and comprisesa first-stage quartz-sand layer, a second-stage quartz-sand layer and a third-stage quartz-sand layer which are arranged in sequence from top to bottom; the particle diameters of the quartz sand of the first-stage quartz-sand layer, the second-stage quartz-sand layer and the third-stage quartz-sand layer are reduced in sequence; the bottom part of the second-stage quartz-sand layer is arranged obliquely; the third-stage quartz-sand layer consists of a plurality of snake-shaped pipes which are arranged in a side-by-side manner; the upper ends of the snake-shaped pipes are provided with openingswhich are communicated with the oblique bottom parts of the second-stage quartz-sand layer.

The invention discloses a self-healing filter cap of a sand filter and a mounting and using method of the filter cap. The filter cap comprises a filter bearing assembly, a water and air part and a self-healing fastening part, wherein the filter bearing assembly is used for bearing granular filter materials and allowing clear water to pass; the water and air part is used for guiding filtered waterto a filter plate and allowing backwash water and compressed air to pass; the self-healing fastening part is used for fastening and connecting the filter plate and filtering the filter materials secondarily; the filter bearing assembly is connected with the self-healing fastening part through the water and air part. With application of the self-healing filter cap of the sand filter, damage to mainline equipment by the fact that the granular filter materials in the sand filter enter a circulating water system can be avoided to the greatest extent, and influence on product quality is avoided.

The invention discloses a sewage treatment system used in a precision-investment casting technique. The sewage treatment system comprises a sewage tank for collecting sewage in a workshop, and a sedimentation tank, a sand filter, an anaerobic hydrolysis pond and a clean water tank which are communicated with the sewage tank in sequence, wherein the sand filter comprises a one-stage sand filter and a two-stage sand filter; the sand filter consists of a converse-trapezoid opening container and filter sand paved in the opening container; the anaerobic hydrolysis pond consists of a one-stage anaerobic hydrolysis pond, a two-stage anaerobic hydrolysis pond, a three-stage anaerobic hydrolysis pond and a four-stage anaerobic hydrolysis pond. The sand filter comprises the one-stage sand filter and the two-stage sand filter, so that toxic impurities such as ammonia and chlorine in the sewage can be effectively filtered, the filter effect is good, the sewage after treatment can meet the standard of industrial water, and the sewage treatment system is low in cost during running.