The invention discloses a
chemical cleaning method for
nanofiltration or
reverse osmosis membranes. The
chemical cleaning method includes the following steps: (1)
pickling the
nanofiltration or
reverse osmosis membranes by acidic solutions; (2) cleaning the
nanofiltration or
reverse osmosis membranes
by product water after
pickling; (3) performing alkali washing on the nanofiltration or reverse
osmosis membranes by alkaline cleaning solutions; (4) cleaning the nanofiltration or reverse
osmosis membranes by the product water after alkali washing to complete cleaning of the nanofiltration or reverse
osmosis membranes. The
chemical cleaning method has the advantages that various pollutants on the nanofiltration or reverse osmosis membranes can be efficiently removed, the operating pressure ofthe nanofiltration or reverse osmosis membranes can be reduced, the yield of
clear liquid of the nanofiltration or reverse osmosis membranes can be increased, the service life of the nanofiltration or reverse osmosis membranes can be prolonged, the
power consumption of the
clear liquid can be lowered, and stable operation of landfill
leachate treatment plants can be guaranteed; the chemical cleaning method has the advantages of simple process, convenience in operation, low cleaning cost, high cleaning efficiency, good cleaning effect, high application value, good application prospect and thelike.