Conventional quartz filter has found applications in water treatment field at earlier stage and is still applied in water filtration field due to simple technique, but its shortcomings are common to all. Characteristics of both in the process of operation and maintenance are detailed below, which will surely serve as reference to for you in selecting technical design and equipment.
| |
Double intelligent pressure differential filter |
Conventional sand filter or sand-bed filter |
| Filter medium |
316L stainless steel sintered mesh，permanently used |
quartz sand，
periodically replaced or supplemented |
| Filter fineness |
Maximum 2Micron |
Optimal dozens of micron under the condition of no flocculating agent |
The quality
of outlet water |
Stable，no impurities penetration ocuurs,no biological contamination is added |
Unstable, impurities may penetrate filter screen to enter product water at the initial stage of cleaning operation or in the case of failure in cleaning in a timely manner; moreover, filtering bed facilitates the propagation of microorganism to increase the content of microorganism in product water |
| Flow speed |
No restrictions |
There are restrictions, generally the filtering speed is 8～10m/h, if filtering speed is too high, the effectiveness of filtering will be affected, even more it will result in incapacity of filtering. |
| Filtering mode |
Direct filtering, it can ensue the filter fineness, all impurities with size being larger than filter mesh size can be intercepted |
Indirect filtering; filtering is effected through millipores on the surface of filter materials and clearance between filter materials; pores and clearance is irregular, fineness can’t be guaranteed, which will easily result in current bias and lead to penetration of impurities through filter screen |
| Water treatment volum |
Large |
It is subject to filtering speed, small |
| Backwash |
Automatically detect water pressure based on the situation of filth and blocking in filter screen to achieve automatic backwash which is slightly affected by the fluctuation of water quality and will not result in interruption of normal water production |
Mostly manual cleaning; normal water production will be interrupted during cleaning, even some filters can make automatic cleaning but conduct cleaning on the basis of time or water quantity rather than the situation of filth and blocking; more water and electricity may be consumed during non-cleaning period; in the event of high fluctuation of water quality and delay in cleaning, the quality of water produced may worsen |
| Time for cleaning |
55s |
Generally 20min～ 1 h |
| Water consumption for cleaning |
Low，consuming only 40～60L water for cleaning for one time |
High，the quantity for backwash is two times those under normal operation |
| Degree of automation |
High, remote control |
Low, no automatic detection and response capacity |
| Floor area |
Small |
It is subject to filtering speed, large |
| Expansion and reconstruction |
Easy, flexible installation and movement; technical renovation can be made on the basis of original state |
Difficult, for expansion, space should be reserved in the initial stage of design; generally it can’t be moved after use and also it is difficult to make technical renovations. |
| Cost of investment |
Unit investment cost decreases with increasing water treatment volume |
Unit investment cost increases with increasing water treatment volume |
| Operating cost |
Low; covering only cost for low electricity and water consumption for
cleaning |
High; cost for large water and electricity consumption during cleaning and labor cost for routine maintenance and management |
