By means of a factorial design,different backblowing parameters influencing on flux include filtration cycle,time of backblowing,water pressure and air press.

Determination of theoretical backwashing time in pressure filter;

Study on the filtration and backwashing for the quartz filter in micro-irrigation;

Parameters experiment of backwashing on sandy filter in micro-irrigation;

Study on backwashing of bio-filter bed of iron and manganese removal in steady running period;

Study on Backwash Properties of Biological Aerated Filter;

The results showed that the optimal press is 19～65 kPa and the optimal interval of backwash is 25 min.

It was found that PAC addition was effective in enhancing flux and that flux could be recovered by backwash,suggesting that PAC can prevent membrane from fouling.

The tracking information of over two years after improvement of the dual filter by high speed wire back washing showed benefit and practical value after the improvement.

The key parameters in the operations were summarized as filtration precision,filter medium,filtration operation,back washing and so on.

The oil field waste water automatic treatment system comprises automatic dosing, automatic blow-down and automatic back washing.