The invention discloses a multi-unit
seawater desalination device and a multi-unit
seawater desalination method. The multi-unit
seawater desalination device comprises a pretreatment unit, a desalination unit, a distribution unit and a concentrated
water treatment unit. The pretreatment unit comprises a water drawing pump, an air flotation
machine and a
raw water tank; the desalination unit comprises a multi-
media filter, a security filter and a
reverse osmosis apparatus; the distribution unit comprises a mineralization filter, a
water storage tank and a variable-frequency constant-pressure
water supply mechanism; the concentrated
water treatment unit comprises a concentrated water pond, an aerating
biological filter chamber and an
electrolysis mechanism. The multi-unit
seawater desalination method includes sequentially carrying out alga removing,
impurity filtering,
reverse osmosis and mineralization treatment; electrolyzing
reverse osmosis concentrated water and then adding the reverse
osmosis concentrated water into seawater with
algae to be removed. The multi-unit
seawater desalination device and the multi-unit
seawater desalination method have the advantages that organic matters such as the
algae in the seawater can be removed by the aid of the air flotation
machine, accordingly,
workload on desalination films of the reverse
osmosis apparatus can be relieved, and the service life of the reverse
osmosis apparatus can be advantageously prolonged; the concentrated water treated by the aid of the reverse osmosis apparatus can be electrolyzed by the aid of the
electrolysis mechanism,
sodium hypochlorite solution formed by means of
electrolysis can be added into the air flotation
machine and / or the
raw water tank, accordingly, the alga organic matters can be oxidized, andstench of
fresh water which is already subjected to reverse osmosis can be prevented.