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1）Preferred fittings of reverse osmosis system
2）Designed according to ASTM D4189-95 criterion
3）SDI (FI) value monitored betimes,well and truly and on-line
4）Particular and detachable design of valve connecting quickly,
make replacing filter membrane in facility and quickly
5）Designed with pipeline style,easy to fix on-line
6）Patented product with new and utility style
The value of pollution index (SDI Apparatus),namely, Fouling Index (FI) value, is one of important parameter to the index of water quality.It indicate the amount of particle,colloid and other substance in water that can occlude various water purified devices.Determining the SDI value,would be instrumental in fixing upon relevant water purified technology or device.Under ASTM method 4189-95,this way is generally accepted.
During reverse osmosis water treatment system,the value of pollution index (SDI Apparatus) determines one of the important indexes of the water entering the reverse osmosis.It is the main means wether the entering water is up to the requirement of reverse osmosis device through examining water treatment process system in advance.The size of pollution index is crucial to life-span of reverse osmosis operation.
SDI value is determined by attenuation of water flow velocity,when water flow entering microfiltration membrane (outer dia.47mm,pore size:0.45µm).At pore size-0.45µm,colloid sustances more easily occlude filter membrane than hard particles(such as sand,dirt,rust,scale etc.),so this pore size is usually used for determination of the SDI value.The attenuation of water flow velocity transformed into numerical value between 1 and 100,namely SDI value,the SDI value is smaller,the filter membrane is not more easily polluted and occluded by particles and colloid substances in water.Considering economy and efficiency roundly,the SDI value of the water entering the reverse osmosis device,is generally required under “5”.
QZDY-SDI47 pollution index (SDI APPARATUS),including pressure regulating valve,outer dia.47mm membrane filter box,microfiltration membrane piece and some required valve,joining pipe,connector etc. In addition,the apparatus system including a box of CN-CA mixed cellulose filter membrane pieces,absolutely reaching the requirement of ASTM method. Using this apparatus, must prepare a measuring cylinder and stopwatch for determining SDI value on-line.
l Measuring cylinder----cubage 500 ml, min. scale 5ml
l Stopwatch --------------precision 0.2 second
l CN-CA mixed cellulose microfiltration membrane pieces(expendable)------outer dia.:47mm, Pore size: 0.45um; |
