3.2.2. VEDCMD membrane cleaningOne

3.2.2. VEDCMD membrane cleaning
One of the objectives of the study was to investigate the ease
by which the scale layers could be removed from the membrane
surface. The membranes were chemically cleaned with Na2EDTA
solution after their water flux dropped below 5 L/(m2 h). Brine A
was used as the feed in these experiments because it scaled the
membrane more rapidly than brine B (Fig. 3). Also, in order to
expedite scale formation, experiments were conducted with a temperature
difference of 40 ◦C instead of 20 ◦C.
Water flux and batch recovery before and after membrane cleaning
are shown in Fig. 5a and b for the PTFE and PP membranes,
respectively. The PP membrane was included in the cleaning experiments
to compare its fouling tendency and chemical resistance
with the PTFE membrane. The performance of the PTFE membrane
(Fig. 5a) was different before and after cleaning. The initial water
flux after cleaning was the same as the initial flux before cleaning,
except that after cleaning there was an immediate onset of flux
decline. This suggests that the majority of scale was removed from
the membrane following cleaning, thus restoring water flux to its
initial level [34]; however, the residual scale that did remain on the
membrane most likely provided sites for crystallization, leading to
more rapid scale formation and earlier onset of flux decline after
cleaning. The performance of the PP membrane (Fig. 5b) was similar
before and after cleaning. This implies that scale deposit on the
PP membranes is less strongly adhered to the membrane and can
be removed using a simple cleaning method.

Kết quả (Việt) 1:

3.2.2. VEDCMD màng làm sạch Một in the mục tiêu nghiên cứu of is for điều tra sự dễ dàng theo then quy mô lớp be removed from màng tế bào bề mặt. Các màng been làm sạch hóa học with the Na2EDTA giải pháp after thông lượng nước their reduce xuống Bottom 5 L / (m2 h). Nước muối Một used as nguồn cấp dữ liệu in the thí nghiệm this because the thu nhỏ màng faster against nước muối B (hình 3) . Ngoài ra, để đẩy nhanh quy mô hình, thử nghiệm was tiến hành with one nhiệt độ sự khác biệt of 40 ◦C instead of 20 ◦C. Nước tuôn ra hàng loat and recover before and after làm sạch màng Đang hiển thị trong hình 5a and b for the màng PTFE and PP, match. PP màng included in the thí nghiệm làm sạch to compare of its hà xu hướng and hóa chất kháng for PTFE màng. Hiệu suất of PTFE màng (Hình 5a) is equal before and after làm sạch. Nước ban đầu thông after làm sạch is like tuôn ra ban đầu before làm sạch, Ngoại trừ after làm sạch already have an initial ngay lập tức of thông denied. This cho thấy đa số that quy mô was removed from Các màng tế bào sau làm sạch, khôi phục lại làm then thông lượng nước to its Ban đầu level [34]; Tuy nhiên, còn lại quy mô mà làm was still trên of màng probably cung cấp các trang web cho tinh, dẫn to faster quy mô hình thành trước and which begins tuôn ra từ chối after làm sạch. Hiệu suất of the màng tế bào PP (hình 5b) is tương tự such as before and after làm sạch. This indicate that quy mô tiền gửi trên of PP màng is ít mạnh mẽ tôn trọng màng and can be removed bằng cách sử dụng phương pháp đơn one giản làm sạch.