DO-HS SUCCESSFULLY IMPLEMENTED IN DSHANIM FUCTORY

Four RO trains operate old, silica scaled and chlorine damaged RO membranes. Within 50 days of DO-HS cleaning, injection was made, ones a day, with intervals for the holidays.

BWRO
One of the four containerized BWRO trains, Dshanim Factory, Israel.
Since DO-HS has been implemented the significant decrease in the pressure drop between feed and brine stream and decreased in the product conductivity were achieved, as shown in table below:

Decrease of the Pressure Drop (bar) in four RO Trains
RO trains	RO-1	RO-2	RO-3	RO-4
Before DO-HS cleaning	5.60	6.00	5.40	5.50
After 50 DO-HS cleanings	4.40	4.10	3.20	4.00
Decrease in pressure drop	21%	32%	41%	27%
Decrease of the product Conductivity (µS) in four RO Trains
RO trains	RO-1	RO-2	RO-3	RO-4
Before DO-HS cleaning	42	87	68	80
After 50 DO-HS cleanings	33	76	60	76
Decrease in product conductivity	21%	13%	12%	5%

Graph below presents dynamics of the pressure drop (bar) and product conductivity (µs) decrease during the DO-HS cleaning in the RO train 3.

Decease in pressure drop

Sixteen Membranes have being weighed before and after DO-HS cleaning. They weight reduced from: 20-23 kg, to 17 kg. In both cases membrane was weighed half hour after removal from pressure vessel. The same membrane of 17 kg weighed after 24 hours has 15.5 kg.

On the left photo above presented the membrane before DO_HS cleaning. On the right photo above presented photo of membrane after 50 cycles of DO-HS cleaning.

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