摘要:
The desalination apparatus is provided with a first pressurization means, a first reverse osmosis membrane module, a first mixing line, a second pressurization means, a second reverse osmosis membrane module, a second mixing line, a first flow meter, a first adjustment valve, a second flow meter, a second adjustment valve, an electric conductivity meter, a third flow meter, and a control unit. The control unit controls the actions of the second pressurization means, the first adjustment valve and the second adjustment valve on the basis of acquired information and adjusts the power consumed by the second pressurization means as well as the product water flow rate and electric conductivity.
摘要:
PROBLEM TO BE SOLVED: To provide a reverse osmotic membrane device capable of stably treating a body of raw water including copious membrane pollutants such as membrane bioreactor (MBR)-treated water, etc. by preventing a water permeation volume attenuation; and a method for operating the same.SOLUTION: In a method for operating a reverse osmotic membrane device for treating, as a body of raw water, water including organic polymers, the raw water includes organic polymers having molecular weights of at least 10,000 at concentrations of 0.01 ppm or above. The reverse osmotic membrane device includes a spiral reverse osmotic membrane element satisfying the following formula (1). The reverse osmotic membrane device is operated at a permeation flux of 0.6 m/d or below. Membrane area (m)≥n×(11/16) (1) (n expresses the diameter (inches) of the reverse osmotic membrane element).
摘要:
The purpose of the invention is to provide a system which uses an osmosis membrane to obtain fresh water from salt-containing raw water such as seawater, wherein the system produces fresh water at lower energy consumption. According to the present invention, the system for producing fresh water includes: a forward osmosis membrane processing means for removing salt from raw water via a forward osmosis membrane to obtain permeated water in a solution having an osmotic pressure higher than that of the raw water; a separating means for separating the solute component of the high-osmotic pressure solution, the high-osmotic pressure solution containing the permeated water obtained by the forward osmosis membrane processing means and Na2HPO4 or ethylene carbonate as the solute component; a reverse osmosis membrane processing means for desalinizing the solution separated from the solute component by the separating means as raw water through a reverse osmosis membrane to obtain fresh water; a pump for supplying the raw water to the reverse osmosis membrane processing means; and a pipe for mixing the solute component separated and collected by the separating means, in the high-osmosis pressure solution supplied to the forward osmosis membrane processing means.
摘要:
PROBLEM TO BE SOLVED: To provide a seawater desalination apparatus and a method for washing a seawater desalination apparatus each capable of reducing the initial cost and of abating manual operations of users.SOLUTION: The provided seawater desalination apparatus comprises: a reverse osmotic membrane 10 for separating seawater into fresh water and concentrated seawater; a pretreatment water tank 2 for stocking the seawater or fresh water scheduled to be supplied to the reverse osmotic membrane 10; a permeated water tank 12 into which water is fed from the fresh water discharge side of the reverse osmotic membrane 10; a water washing pump 14 for supplying, following the supply therein of water from the permeated water tank 12, the water into the pretreatment water tank 2; a washing water tank 18 furnished with an agitator 180 and into which bodies of water are supplied respectively from the fresh water discharge side and concentrated seawater discharge side of the reverse osmotic membrane 10; a backwash pump 16 for pumping the washing water from the washing water tank 18 and then transmitting the water to the step anterior to the reverse osmotic membrane 10; and a controller CTR for controlling the respective operations of the water washing pump 14, agitator 180, and backwash pump 16.
摘要:
PROBLEM TO BE SOLVED: To monitor every series of RO membrane respectively, detect abnormality in a seawater desalination plant, and control operation condition of the plant based on the detected result.SOLUTION: A control apparatus includes third calculation means, first monitoring and detecting means and first control means. The third calculation means calculates a resistance value at each of reverse osmotic membranes respectively, based on each of inlet pressure values and fresh water quantities in second measurement data and each osmotic pressure. The first monitoring and detecting means monitors change of characteristics of each reverse osmotic membrane and detects abnormality, based on each of the calculated resistance values. When abnormality is detected by the first monitoring and detecting means, the first control means, after reading out a condition equation or an operation equation associated with a selected operation mode from storage means, performs operation processing by using the condition equation or the operation equation which is read out, and controls operation of a seawater desalination plant based on the result of the operation processing.
摘要:
PROBLEM TO BE SOLVED: To provide a rejection enhancing method of an RO membrane in which the stability of a removal performance (rejection) and the flux stability (stain-resistant persistence) are improved furthermore.SOLUTION: A rejection enhancing method of an RO membrane has a step of passing a water solution containing polyphenol through an RO membrane. The rejection enhancing method of the RO membrane further has a step of passing a water solution containing one or more kinds selected a group comprising a modified polyvinyl alcohol, a high polymer polysaccharide and a polyamino acid in the RO membrane. Preferably, the method further may have a step of passing an organic compound having an amino group with a molecular weight of 1000 or less in the RO membrane.
摘要:
[Problem] To provide a device for purifying fresh water after absorption of water in a more semi-hyperosmotic solution for hyperosmosis than sea water using a forward osmosis membrane with sea water as the raw water. Also to be able to inhibit deposition of solids (ammonium carbamate) arising from NH3 and CO2 generated in the fresh water purification process, to separate this gas from the semi-hyperosmotic solution by a separation means, and reduce the device scale by making re-dissolving of the gas by a re-dissolving means more efficient. [Solution] A separation means (3) for a solute in the fresh water purification process has a plurality of recovery openings (4, 5) that recover solute components in a semi-hyperosmotic solution as a mixed gas and a carrier gas supply opening (6) and pump (10) that supply a carrier gas to the separation means (3). The gas recovered by the separation means (3) is re-dissolved in a re-dissolving means (14). Deposition of solids arising from NH3 and CO2 can be suppressed by a constitution that supplies gas supplied by the recovery openings (4, 5) to the re-dissolving means (14) from infusion openings (12, 13) that differ, respectively, along with the carrier gas.