I. Decrease of water volume in the cycle
1. "Clumping" of the filter layer
2. Insufficient backwashing strength or incomplete backwashing
3, backwashing cycle is too long
4, water distribution device (or drainage device) damage, causing partial flow
5、The filter layer is too low
6, the original water quality suddenly turbid (such as flood period, the water content of suspended matter increased sharply)
Treatment methods.
1、Strengthen backwashing and water coagulation and clearing work
2, adjust the backwash water pressure and flow, to strengthen the backwash work
3, appropriate to increase the number of backwashing, shorten the backwashing cycle
4, check the distribution, drainage devices, and symptomatic treatment
5、Appropriately increase the height of the filter layer
6, strengthen the raw water quality analysis and data collection, grasp the law of water quality changes strong raw water turbidity coagulation work, reduce the turbidity of water into the filter
II, the filter flow does not go up
1、Inlet water pipe or drainage system head resistance is too large
2, the upper part of the filter layer is blocked by sludge or "clumping" serious
Treatment methods.
1、Change or remove the relevant fault
2, remove the dirt or "lump", thoroughly backwashing filter strong turbidity coagulation work, reduce the content of suspended matter in the water
III. Backwashing run sand or carbon
1, backwashing intensity is too large
2, drainage (or water distribution) device damage, resulting in backwashing water "partial flow"
Treatment methods.
1, immediately reduce the backwashing strength
2, immediately check the drainage (or water distribution) device, and symptomatic treatment
IV. Long backwashing time
1, backwashing water in the filter cross-sectional area is unevenly distributed or there are dead ends
2, the filter layer is too dirty
Treatment methods.
1, check the water distribution or drainage device, eliminate dead ends
2, appropriate to increase the number of backwashing and backwashing intensity
V. The turbidity of the water does not meet the requirements
1, the surface of the filter layer is polluted with serious pollution
2, over the layer height is not enough
3、Filtering speed is too fast
Treatment methods.
1、Improve the coagulation of the raw water; increase the backwashing strength
2、Increase the height of the filter layer
3, adjust the filtration speed to the appropriate degree
VI. There is complete granular filter material in the outlet water during operation
1、Drainage device damage
Treatment method.
1, remove the filter media, check the drainage device, check the cause of damage to the drainage device, and deal with the symptoms
Translated with www.DeepL.com/Translator (free version)
