A filtering device is for obtaining a chemical liquid by purifying a liquid to be purified, and has an inlet portion, an outlet portion, a filter A, at least one filter B different from the filter A, and a flow path which includes the filter A and the filter B arranged in series between the inlet portion and the outlet portion and extends from the inlet portion to the outlet portion, in which the filter A includes at least one kind of porous membrane selected from the group consisting of a first porous membrane having a porous base material made of polytetrafluoroethylene and a non-crosslinked coating which is formed to cover the porous base material and contains a perfluorosulfonic acid polymer and a second porous membrane containing polytetrafluoroethylene blended with a perfluorosulfonic acid polymer.

A water purification device, with a first pressure cylinder, a second pressure cylinder, a first connecting piece and a second cylinder block arranged successively from bottom to top, and further having a first cylinder block arranged inside the second cylinder block. The first pressure cylinder and the second pressure cylinder both are open at one end and formed with a first through-hole at the other end. The first cylinder block and the second cylinder block both are open at two ends and arranged in a hollow shape. A water inlet, which is communicated with a flow passage formed between the first cylinder block and the second cylinder block, is formed on the second cylinder block, and a water outlet pipe communicated with the first cylinder block is inserted into an outer wall of the first pressure cylinder.

A water purification device, with a first pressure cylinder, a second pressure cylinder, a first connecting piece and a second cylinder block arranged successively from bottom to top, and further having a first cylinder block arranged inside the second cylinder block. The first pressure cylinder and the second pressure cylinder both are open at one end and formed with a first through-hole at the other end. The first cylinder block and the second cylinder block both are open at two ends and arranged in a hollow shape. A water inlet, which is communicated with a flow passage formed between the first cylinder block and the second cylinder block, is formed on the second cylinder block, and a water outlet pipe communicated with the first cylinder block is inserted into an outer wall of the first pressure cylinder.

Disclosed are a slidable filtration apparatus capable of performing reciprocating motion in a filtration tank and a filtration system including the same. The filtration apparatus includes a frame and a membrane module installed in the frame, wherein the frame includes at least two horizontal linear motion members provided at an upper portion thereof.

Disclosed are a slidable filtration apparatus capable of performing reciprocating motion in a filtration tank and a filtration system including the same. The filtration apparatus includes a frame and a membrane module installed in the frame, wherein the frame includes at least two horizontal linear motion members provided at an upper portion thereof.

A filtration module according to one embodiment of the present invention includes plural hollow fiber membranes held while being aligned in one direction and a pair of holding members that fix both ends of the hollow fiber membranes. In the holding members, an existence region where the hollow fiber membranes exist has a rectangular shape in a direction perpendicular to the direction in which the hollow fiber membranes are aligned. The hollow fiber membranes are arranged in a matrix in a long side direction and a short side direction of the existence region. In the existence region, a ratio of an average pitch of the hollow fiber membranes in the long side direction to an average pitch of the hollow fiber membranes in the short side direction is 1.2 or more and 2.5 or less.

A filtration module according to one embodiment of the present invention includes plural hollow fiber membranes held while being aligned in one direction and a pair of holding members that fix both ends of the hollow fiber membranes. In the holding members, an existence region where the hollow fiber membranes exist has a rectangular shape in a direction perpendicular to the direction in which the hollow fiber membranes are aligned. The hollow fiber membranes are arranged in a matrix in a long side direction and a short side direction of the existence region. In the existence region, a ratio of an average pitch of the hollow fiber membranes in the long side direction to an average pitch of the hollow fiber membranes in the short side direction is 1.2 or more and 2.5 or less.

A fluid circulation monitoring system includes a distributed processing system having a first processor located on-premises near a space filled with a circulating fluid and a second processor located off-premises. The first processor and the second processor are in communication with one another. A sensor is operatively connected to the first processor and senses at least one parameter associated with a flow rate of fluid through the circulation system. The distributed processing system is configured to process the at least one parameter and derive a volumetric fluid flow rate through a fluid pump which propels the fluid through the circulation system. Pattern recognition is applied to the at least one parameter to detect maintenance events and predict the need for maintenance events.

A control system for monitoring a filter in a subsea control module (SCM) of an underwater hydrocarbon well is presented. The control system includes an upstream pressure transducer disposed upstream of a filter of the SCM and configured to sense an upstream pressure. The control system further includes a downstream pressure transducer disposed downstream of the filter and configured to sense a downstream pressure. Furthermore, the control system includes a subsea electronics module (SEM) coupled to the upstream pressure transducer and the downstream pressure transducer. The SEM is configured to determine average pressure differential values at different instances based on the upstream pressure and the downstream pressure. Moreover, the control system also includes a master control station (MCS) coupled to the SEM and configured to predict a filter maintenance generate an indication of the predicted filter maintenance due time for an operator of the underwater hydrocarbon well.

A desalination system (100) having an intake unit (110) providing seawater to a pre-treatment unit (120) connected to a reverse osmosis (RO) desalination unit (130) and a post treatment unit (150). The desalination system (100) is configured to operate without any external addition of chemicals to simplify logistics and regulation concerns. The units of the system are configured to prevent biofouling, scaling and corrosion by mechanical and biological means including high flow speeds, biological flocculation of colloids, and making the water entering the RO units inhospitable to bacteria and other organisms that cause biofouling, hence preventing their settlement and removing them with the brine. Recovery rate is lowered and energy is recovered to increase the energetic efficiency and minerals that are added to the product water are taken from the brine.