UF membrane operation condition and output water quality

 

Operating condition

 

pretreatment	50-150um
Maxinmum inlet turbidity	50NTU max
Operating inlet pressure	cross-flow or dead - end filtration
TMP,(20 degree)	28-150KPa
Maxinmum TMP	0.2MPa
Operating PH	2-12
Operating temperature	5-45 degree
Continuous rudimental Chlorin chroma	100ppm
Inrerim rudimental Chlorin chroma	200ppm
output water index
output water turbidity	0.1NTU max
SDI	1 max
dispel rate of SS	99.99%
animalcule, bacilli, pathogeny	99.99%
back wash design
back wash pressure	0.2-0.25MPa
water flux of back wash	220-300lmh
back wash frequency	Every 20-60 minutes
back wash time	30-60 seconds
CEB frequency	suggest you add liquidmedicine when backwash
CEB time	30-60 seconds
chemical cleaning design
chemical cleaning design frequency	Every 1-4 months or TMP>0.15
chemical cleaning pressure	0.15MPa
chemical cleaning flux	200-250lmh
chemical cleaning time	Every 60-90 minutes
acid cleaning medicament	citric acid or oxalic acid
alkali cleaning medicament	NaoH liquor(PH=2)
saving of UF membrane
new membrane before using	airproof
halt using in 7 days	Infuse UF water or water mixing with RO water and NaclO(10ppm)
halt using above 7 days	Chemical cleaning ,then infuse 69% UF water(/RO water) 1% NaHSO3 +30% glycerin

 

UF system design guideline

1.original liquid water quality: original liquid type, turbidity,temperature, COD, PH.

2. Requirements: output quantity, output water quality standard, return rate.

3. Orientation of project designing: invest cost, output water quality standard, running cost.

 

Brief state of application of  UF system

 

1. Application of pure water, ultrapure water and purify water

2. Application of city sewage recycling

3. Application of industrial waste water

4. Application of special separation, concentrating.

5. Application of drink water

Applicable sphere: Mineral water, pure water, tap water, country drink water. Pretreatment of Ro membrane.