The present disclosure provides a complete set of equipment for supplying drinking water in field. The complete set of equipment for supplying drinking water in field consists of several units carried by single person, making the water purification equipment easy to use and transport. The complete set of equipment includes a multi-stage filtration unit, a reverse osmosis unit, and a power control unit connected by a plug-in pipeline.

A water purification apparatus receives raw water, which sequentially passes through a pre-filter, a pump, an RO filter, and a post-filter and is stored in the post-filter as drinking water. A recirculating water loop is in fluid communication with the post-filter and the pump to facilitate flow of the drinking water. A water quality detector generates a water quality signal corresponding to a quality value of the drinking water. A control valve is in fluid communication with the recirculating water loop. A controller receives the water quality signal and is stored with a water quality standard and a recirculation period. When a water discharging member stops discharge of the drinking water and the quality value exceeds the water quality standard, the controller activates the pump and the control valve, such that the drinking water in the post-filter recirculates through the recirculating water loop and is re-purified.

An acidic treatment liquid processing apparatus includes: a tank having an interior space; a diaphragm permeable to a metal cation and separating the interior space of the tank into a first chamber and a second chamber; a first electrode disposed in the first chamber; a second electrode disposed in the second chamber; a power supply configured to apply a voltage while using the first electrode as an anode and the second electrode as a cathode; a first liquid passing part configured to pass an acidic treatment liquid containing a dichromate ion and a metal cation into the first chamber; and a second liquid passing part configured to pass an acid aqueous solution into the second chamber.

A cleaning-in-place method for cleaning a membrane filter module, the membrane filter module including a membrane having a feed side and a permeate side and being configured to filter a fluid passing through the membrane from the feed side to the permeate side; wherein the method comprises performing a sequence of process cycles, the sequence comprising at least one monitored process cycle, the monitored process cycle comprising: providing a flow of a liquid through the membrane and/or across the feed side of the membrane; monitoring at least one hydraulic parameter associated with the provided flow of the liquid; and terminating the flow of the liquid, when the at least one monitored hydraulic parameter meets a predetermined cycle completion criterion.

A method, an apparatus and a controller for pre-treatment of seawater is described. The apparatus controls a supply of a seawater stream to a filtration unit, which outputs a first filtered stream based on the supply of the seawater stream. The method further includes controlling a supply of the first filtered stream to a graphene-based ultrafiltration unit. The graphene-based ultrafiltration unit outputs a second filtered stream based on the supply of the first filtered stream. The graphene-based ultrafiltration unit comprises graphene oxide membranes. The method further includes controlling a supply of the second filtered stream to a seawater reverse osmosis (SWRO) membrane unit. The method further includes controlling an outlet of the SWRO membrane unit to output a desalinated stream based on the supply of the second filtered stream.

This disclosure relates generally to method and system to monitor and control continuous ultrafiltration (UF) process units. In real time, continuous operation of UF to handle variating concentration in feed stream is tedious and complex. The UF plant system receives a plurality of input data configured to UF process units and from the real time data outliers are removed and missing values are imputed. The prediction module predicts a volumetric concentration factor (VCF) value and a throughput value by selecting a model from a model repository. The optimization module optimizes the VCF value, and the throughput value based on a plurality of optimal variables recommended for a given feed concentration. The UF plant system controls the VCF value and the throughput value for a predefined period of a prediction horizon based on a plurality of trajectory profiles recommended for the feed flow rate, the pressure data, and a feed concentration.