Abstract:
Disclosed is a method—for cleaning a separation membrane module after raw water containing particles that have a higher hardness than the separation membrane are percolated using the separation membrane—wherein, with the aims of efficiently decreasing abrasion of the outer membrane surface resulting from the high-hardness particles during air washing, suppressing cake filtration resistance deriving from high-hardness particles on the membrane surface when the membrane continues to be used in a percolation step, and enabling stable operation at a low membrane percolation pressure differential, after ending percolation, after water on the primary side of the membrane within the separation membrane module is discharged out of the system, back-pressure cleaning is conducted, during which the back-pressure cleaning wastewater within the separation membrane module is discharged, and then one of the belowmentioned steps is conducted, after which the water on the primary side of the membrane in the separation membrane module is discharged out of the system: (a) a step wherein the primary side of the membrane in the separation membrane module is filled with water and air washing is performed; (b) a step wherein air washing is performed while supplying water to the primary side of the membrane within the separation membrane module.
Abstract:
The present invention relates to a denim-like clothing mainly including a woven or knitted fabric and having a whitening index of less than or equal to Class 4, which woven or knitted fabric includes ultrafine fibers or fibers capable of forming ultrafine fibers on its surface, and the whitening index is expressed in grey scale for assessing change in color specified in Japanese Industrial Standards (JIS). In preferred embodiments, the denim-like clothing has, for example, the following characteristics: (a) The denim-like clothing has a roughness index of equal to or more than 3 micrometers as determined using a measuring machine, KES-FB4; (b) the ultrafine fibers or the fibers capable of forming ultrafine fibers are ultrafine fibers having a fineness of less than or equal to 0.6 dtex or fibers capable of forming ultrafine fibers having a fineness of less than or equal to 0.6 dtex; (c) the fibers capable of forming ultrafine fibers are multicore fibers; and (d) the fibers have a matrix component that has been degraded. The invented denim-like clothing includes the ultrafine fibers or fibers capable of forming ultrafine fibers on its surface and is easily whitened by flexing or rubbing to thereby exhibit the feeling or semblance of a natural fiber denim.
Abstract:
The present invention has an object to provide a method for washing a separation membrane module after filtering raw water containing particles having a hardness higher than that of a separation membrane, wherein abrasion of the membrane outer surface by high hardness particles at the time of air scrubbing is efficiently reduced, and a cake layer resistance originating in high hardness particles on the membrane surface is suppressed when the membrane is successively used in a filtration step to allow stable operations at a low transmembrane pressure for a long time period. Thus, after completion of filtration, water at the primary side in a separation membrane module is drained to outside the system, backwash waste water in the separation membrane module is then drained while carrying out backwash, and any of the steps of:filling the primary side in the separation membrane module with water and carrying out air scrubbing; andcarrying out air scrubbing while feeding water to the primary side in the separation membrane moduleis then carried out, followed by draining water at the primary side in the separation membrane module to outside the system.
Abstract:
Disclosed is a method—for cleaning a separation membrane module after raw water containing particles that have a higher hardness than the separation membrane are percolated using the separation membrane—wherein, with the aims of efficiently decreasing abrasion of the outer membrane surface resulting from the high-hardness particles during air washing, suppressing cake filtration resistance deriving from high-hardness particles on the membrane surface when the membrane continues to be used in a percolation step, and enabling stable operation at a low membrane percolation pressure differential, after ending percolation, after water on the primary side of the membrane within the separation membrane module is discharged out of the system, back-pressure cleaning is conducted, during which the back-pressure cleaning wastewater within the separation membrane module is discharged, and then one of the belowmentioned steps is conducted, after which the water on the primary side of the membrane in the separation membrane module is discharged out of the system: (a) a step wherein the primary side of the membrane in the separation membrane module is filled with water and air washing is performed; (b) a step wherein air washing is performed while supplying water to the primary side of the membrane within the separation membrane module.
Abstract:
Disclosed is a methodfor cleaning a separation membrane module after raw water containing particles that have a higher hardness than the separation membrane are percolated using the separation membranewherein, with the aims of efficiently decreasing abrasion of the outer membrane surface resulting from the high-hardness particles during air washing, suppressing cake filtration resistance deriving from high-hardness particles on the membrane surface when the membrane continues to be used in a percolation step, and enabling stable operation at a low membrane percolation pressure differential, after ending percolation, after water on the primary side of the membrane within the separation membrane module is discharged out of the system, back-pressure cleaning is conducted, during which the back-pressure cleaning wastewater within the separation membrane module is discharged, and then one of the belowmentioned steps is conducted, after which the water on the primary side of the membrane in the separation membrane module is discharged out of the system: (a) a step wherein the primary side of the membrane in the separation membrane module is filled with water and air washing is performed; (b) a step wherein air washing is performed while supplying water to the primary side of the membrane within the separation membrane module.
Abstract:
The present invention relates to a denim-like clothing mainly including a woven or knitted fabric and having a whitening index of less than or equal to Class 4, which woven or knitted fabric includes ultrafine fibers or fibers capable of forming ultrafine fibers on its surface, and the whitening index is expressed in grey scale for assessing change in color specified in Japanese Industrial Standards (JIS). In preferred embodiments, the denim-like clothing has, for example, the following characteristics: (a) The denim-like clothing has a roughness index of equal to or more than 3 micrometers as determined using a measuring machine, KES-FB4; (b) the ultrafine fibers or the fibers capable of forming ultrafine fibers are ultrafine fibers having a fineness of less than or equal to 0.6 dtex or fibers capable of forming ultrafine fibers having a fineness of less than or equal to 0.6 dtex; (c) the fibers capable of forming ultrafine fibers are multicore fibers; and (d) the fibers have a matrix component that has been degraded. The invented denim-like clothing includes the ultrafine fibers or fibers capable of forming ultrafine fibers on its surface and is easily whitened by flexing or rubbing to thereby exhibit the feeling or semblance of a natural fiber denim.
Abstract:
The present invention relates to a denim-like clothing mainly including a woven or knitted fabric and having a whitening index of less than or equal to Class 4, which woven or knitted fabric includes ultrafine fibers or fibers capable of forming ultrafine fibers on its surface, and the whitening index is expressed in grey scale for assessing change in color specified in Japanese Industrial Standards (JIS). In preferred embodiments, the denim-like clothing has, for example, the following characteristics: (a) The denim-like clothing has a roughness index of equal to or more than 3 micrometers as determined using a measuring machine, KES-FB4; (b) the ultrafine fibers or the fibers capable of forming ultrafine fibers are ultrafine fibers having a fineness of less than or equal to 0.6 dtex or fibers capable of forming ultrafine fibers having a fineness of less than or equal to 0.6 dtex; (c) the fibers capable of forming ultrafine fibers are multicore fibers; and (d) the fibers have a matrix component that has been degraded. The invented denim-like clothing includes the ultrafine fibers or fibers capable of forming ultrafine fibers on its surface and is easily whitened by flexing or rubbing to thereby exhibit the feeling or semblance of a natural fiber denim.
Abstract:
The present invention relates to a denim-like clothing mainly including a woven or knitted fabric and having a whitening index of less than or equal to Class 4, which woven or knitted fabric includes ultrafine fibers or fibers capable of forming ultrafine fibers on its surface, and the whitening index is expressed in grey scale for assessing change in color specified in Japanese Industrial Standards (JIS). In preferred embodiments, the denim-like clothing has, for example, the following characteristics: (a) The denim-like clothing has a roughness index of equal to or more than 3 micrometers as determined using a measuring machine, KES-FB4; (b) the ultrafine fibers or the fibers capable of forming ultrafine fibers are ultrafine fibers having a fineness of less than or equal to 0.6 dtex or fibers capable of forming ultrafine fibers having a fineness of less than or equal to 0.6 dtex; (c) the fibers capable of forming ultrafine fibers are multicore fibers; and (d) the fibers have a matrix component that has been degraded. The invented denim-like clothing includes the ultrafine fibers or fibers capable of forming ultrafine fibers on its surface and is easily whitened by flexing or rubbing to thereby exhibit the feeling or semblance of a natural fiber denim.