Industrial Ultrafiltration Membranes for river water filtration

Ultrafiltration membranes are capable of separating larger materials such as colloids, particulates, fats, bacteria, and proteins, while allowing sugars, and other low molecular weight molecules to pass through the membrane.
With a pore size range between 0.01 to 0.1µm, ultrafiltration membrane pore sizes fall between that of nanofiltration and microfiltration. UF membranes typically operate between 50 – 120 PSI (3.4 – 8.3 bar) and are dependent on transmembrane pressure to drive the separation process.

Ultrafiltration is an excellent separation technology for desalination pretreatment, reverse osmosis pretreatment, and wastewater reclamation, as well as for producing potable water.

Ultrafiltration plant are build with, which hollow fiber outside-in or inside-out membranes,  Hinada, we are the ultrafiltration (UF) system manufacturer, we can manufacture UF plant as any your requirements for your water treatment projects.

• High and consistent product quality measured by turbidity (NTU) or silt density index (SDI).
• Tolerance to feedwater quality upsets.
• No use of pretreatment chemicals (polymer, coagulant, pH adjustment) and associated costs for sludge disposal.
• Small footprint and less weight than media filters.

Application of NM-UF Series of membrane module:

◇Surface water and underground water treatment

◇Drinking water treatment and pretreatment for RO system

◇ Industrial water treatment and reuse

◇ Water Recycling

◇ Pretreatment of seawater desalination

 Working conditions and requirements

	Items	parameters	Remarks
	Normal pretreatment	PP filter； Sand Filtering+ Activated carbon Filtering+PP Filtering	The pretreatment combination can be selected according to the raw water condition
	Maximum Input Turbidity	≤15NTU（PVCmembrane） ≤50NTU（PVDF membrane）	The pretreatment and PP filtering are required if the turbidity of filtration inlet water is greater than the standard value
	Filtration method	Dead-end or Cross flow	Dead-end will be suggested if the turbidity≤5NTU，otherwise the cross flow will recommended.  The higher the turbidity is, the greater the cross flow is and the cross flow rate is 10% – 50% of the inflow
	Inlet pressure	0.1-0.3MPA	Under the condition of meeting the design permeating rate, the smaller the inlet pressure is, the lower the fouling rate of membrane module is
	Transmembrane pressure difference at 20℃（TMP)	0.028-0.15MPA	The chemical cleaning will be required if the TMP reaches 0.1MPA
	Maximum  Transmembrane pressure difference（TMP)	0.2MPA	The lower the TMP is, the longer the membrane can use
	Temp	5-45℃	If the temperature is too high, the epoxy resin of the membrane will be denatured and invalid; if the temperature is too low, it will cause the membrane to freeze and solidify
	PH Range	2-12	Strong PH will affect the actual flux rate and service life of the membrane. If necessary, adjust the PH of the original water
	Tolerance of Residual chlorine concentration	100PPM	If the residual chlorine concentration is too high, reduce the oxidation of raw water by adding the reductant
	Short-time  Tolerance of Residual chlorine concentration	200PPM
	Backwash pressure	0.08-0.15MPA
	Backwash flow rate	150-300L/㎡.H
	Backwash frequency	20-60 minutes	The backwash frequency is determined according to the influent water quality. The worse the water quality is, the higher the backwash frequency is.
	Backwash time	90 seconds
	Dosing for backwash	10-15PPM NaOCl liquor	When the concentration of microorganisms and bacteria in raw water is high, it is recommended to add chemicals for sterilization each time;
		Adding acid or alkali	When the raw water tends to pollute the ultrafiltration membrane with organic matter or inorganic salt, it is recommended that chemical backwashing should be carried out every 2-6 hours for 2-5 minutes;
	Chemical cleaning frequency	One time every 1-4 months or when TMP exceeds 0.1MPa
	Chemical cleaning pressure	0.1MPA
	Chemical cleaning flow rate	50-100L/㎡.H
	Chemical cleaning time	60-90 minutes
	Pickling agent	Citric acid, hydrochloric acid (pH = 2 liquor)
	Alkaline agent	Sodium hydroxide and sodium hypochlorite (pH = 12 liquor)