Stacked-plate filters may include a plurality of stacked filter plates with small gaps therebetween. The present disclosure provides a stacked-plate filter apparatus comprising a plurality of filter plates stacked along a longitudinal axis with the filter plates substantially parallel. Each filter plate has a respective outer rim, first face and second face. Each of the filter plates defines a respective opening therethrough. The outer rim forms a first peripheral edge at the first face and a second peripheral edge at the second face. The first peripheral edge is radially misaligned from the second peripheral edge to form an offset gap interface for each adjacent pair of the filter plates. For each of the filter plates, the respective outer rim may be tapered from the first face to the second face to provide the radial misalignment.

A plate for a filter press, a filter press, the use of such a filter press as well as a method of cleaning and sterilization of such a filter press. The plate for a filter press has a base body, consisting of a first material with a hardness H.sub.1 and having an outer circumferential surface, and a frame arranged on the outer circumferential surface, consisting of a second material with a hardness H.sub.2, where H.sub.2<H.sub.1, and wherein the frame has on at least one side surface at least one encircling seal protruding relative to the side surface.

The invention relates to a method for filtering a suspension in a filter device comprising a sequence of steps, including piping the suspension into the filter chamber between the filter cloths, directing the suspension through the filter cloths, discharging a liquid fraction of the suspension through the first duct and the second duct out of the filter chamber and through the first outlet of the first recess plate and the second outlet of the second recess plate as a filtrate, and piping a drying gas from the head piece into the filter chamber through the first duct and discharging the same through the second duct. The invention further relates to such a recess plate that is designed for packing a plurality of specimens of the recess plate into a pack between a stationary head piece and a moveable end piece of a filter device.

A filter press includes a frame, a hydraulic system for compressing and releasing filter plates, the filter plates, a filter chamber, a feed pump, a high-pressure clean water pump, a control system, a rotating plate, a cake removal knife, a squeeze disc, a squeeze disc sleeve, a drive shaft, a brake, a left pull rod, a right pull rod, a pull rod disc, a connector and clutches. The filter cake in the entire filter press can be removed without opening the filter plates in sequence. The filter cake washing is carried out in an enclosed room in a normal direction and a reverse direction, which can not only maintain the dryness and cleanness of the working environment, but also can effectively collect, process treat and recycle the washing water, thus achieving the zero discharge of waste water to meet the environmental requirements at a low cost.

A horizontal filter press is disclosed. The horizontal filter press comprises a support bracket, a head bracket, two sidebars spanning a distance between said support bracket and said head bracket, and a plurality of double filter plates. Each double filter plate comprises a first individual filter plate having a first filter chamber, one or more first filtrate ports, at least one first feed eye port, and at least one first handle; and a second individual filter plate having a second filter chamber, one or more second filtrate ports, at least one second feed eye port, and at least one second handle. The first and second individual filter plates are initially separate components, but are subsequently mechanically joined together to form said at least one double filter plate. In some embodiments a spacer bar is provided between the first and second individual filter plates. In some embodiments, a cutout is provided between the first and second individual filter plates to accommodate a support beam centrally disposed between said sidebars, the support beam providing additional support to the plurality of double filter plates. Methods of manufacturing a double filter plate are also disclosed.

Provided a method for separating PHA and PHA prepared therefrom. The method comprises the following steps: subjecting a PHA fermentation broth to solid-liquid separation to obtain a thallus precipitate; breaking cell walls of the thallus precipitate, and subjecting obtained wall-broken products to a plate and frame filtration to obtain PHA; a filter cloth for the plate and frame filtration is pre-coated with a PHA layer. The method adopts a plate and frame separation to replace the traditional centrifugal separation to prepare PHA, and the PHA layer is pre-coated on the filter cloth for the plate and frame filtration, thereby overcome the defects in the prior art such as high cost and operational difficulty caused by adopting multiple centrifugal separations; in addition, the method of the present disclosure also exhibits the advantages of high recovery rate of PHA and high purity of the prepared PHA product.

A high-efficiency filter press includes a filter plate for solid-liquid separation, a material pool for storing materials and transporting the materials to the filter plate, and a filtrate pool for storing filtrate flowing out of the filter plate, wherein the filter plate is provided with a feed hole, a first drain hole and a second drain hole, the material pool is in communication with the feed hole through a feed pipe, the first drain hole is in communication with the filtrate pool through a first drain pipe, the second drain hole is in communication with the filtrate pool through a second drain pipe. The filter press further includes a washing device which is configured to inject washing water into the first drain hole to allow the washing water to flow out from the second drain hole into the filtrate pool after flowing through the filter plate.

A filtration cassette including a multilaminate array of sheets including filter sheets alternating with permeate sheet members and retentate sheet members, and a cross-flow filter device comprising a multiplicity of stacked filtration cassettes of such type. The improvements associated with the filtration cassettes described herein include, but are not limited to, at least one of: reinforced inlet(s) providing for longevity and improved cleanability of the cassettes; spacer permeate screens to limit throughput restriction; stainless steel or otherwise stiffened permeate sheets to prevent movement and increase flux; and stainless steel permeate sheets that can be used with ultrasonic transmission to minimize fouling of the filter sheets and extend cleaning cycles. Advantageously, the filtration cassettes are more resistant to higher temperatures than the filtration cassettes of the prior art.

Provided a method for separating PHA and PHA prepared therefrom. The method comprises the following steps: subjecting a PHA fermentation broth to solid-liquid separation to obtain a thallus precipitate; breaking cell walls of the thallus precipitate, and subjecting obtained wall-broken products to a plate and frame filtration to obtain PHA; a filter cloth for the plate and frame filtration is pre-coated with a PHA layer. The method adopts a plate and frame separation to replace the traditional centrifugal separation to prepare PHA, and the PHA layer is pre-coated on the filter cloth for the plate and frame filtration, thereby overcome the defects in the prior art such as high cost and operational difficulty caused by adopting multiple centrifugal separations; in addition, the method of the present disclosure also exhibits the advantages of high recovery rate of PHA and high purity of the prepared PHA product.

A filtration cassette including a multilaminate array of sheets including filter sheets alternating with permeate sheet members and retentate sheet members, and a cross-flow filter device comprising a multiplicity of stacked filtration cassettes of such type. The improvements associated with the filtration cassettes described herein include, but are not limited to, at least one of: reinforced inlet(s) providing for longevity and improved cleanability of the cassettes; spacer permeate screens to limit throughput restriction; stainless steel or otherwise stiffened permeate sheets to prevent movement and increase flux; and stainless steel permeate sheets that can be used with ultrasonic transmission to minimize fouling of the filter sheets and extend cleaning cycles. Advantageously, the filtration cassettes are more resistant to higher temperatures than the filtration cassettes of the prior art.