Water purification and treatment apparatus and treatment process using the apparatus

A water purification and treatment apparatus, for use in seawater desalination and purification, comprising a filtering unit, a bio-contact aeration unit and a settling unit, wherein the

• filtering unit comprises at least one rapid water purification filter having a filtering tank, a hopper base disposed at a bottom of the filtering tank for sludge settlement and discharge, an ultrasonic oscillator disposed on the hopper base, a plurality of filtering yarns received in the filtering tank;
• wherein the filtering yarns are compacted by an oil hydraulic press to increase the filtering efficiency of foreign materials contained in the water;
• when the filtering unit is operated to perform a reverse cleaning process, the filtering yarns are sufficiently extended by the oil hydraulic press and efficiently and rapidly cleaned under the action of the ultrasonic oscillator, such that the foreign materials attached on the filtering yarns are shaken down to the hopper base for discharge;
• the bio-contact aeration unit comprises at least one bio-contact aeration basin disposed one after another, the bio-contact aeration basin including a front aeration tank having an under water bio-film contact part, and a rear aeration tank having an under water bio-film contact part and an over water bio-film contact part, in which when the water to be treated and coming from the filter unit flows through the under water bio-film contact part of the front aeration tank, the water obtains a first dissolved oxygen from an aeration generator disposed at a bottom of the front aeration tank and the rear aeration tank;
• then, the water flows through a water sprayer disposed on a top of the rear aeration tank, contacts with air to obtain a second dissolved oxygen, and flows into the rear aeration tank;
• further, when the water flows through the over water bio-film contact part of the rear aeration tank, the water obtains a third dissolved oxygen from photosynthesis of algae growing thereon;
• finally, the water flows into the under water bio-film contact part of the rear aeration tank to continuously obtain a further dissolved oxygen from the aeration generator disposed at the bottom of the rear aeration tank;
• thereby the water obtains sufficient dissolved oxygen to provide a good growing environment for microorganisms;
• and
• the settling unit comprises at least one settling basin for subsequently treating the water coming from the bio-contact aeration unit, the settling basin having a cylindrical main body and a sludge scrapping device operated circularly;
• wherein a circular U-shaped sludge directing channel is defined on a bottom of the settling basin and between a center and a side wall of the settling basin for preventing from the sludge buoyancy when the water flows into the center of the settling basin;
• the sludge scrapping device comprises at least two scrappers disposed at both sides of the U-shaped sludge directing channel, respectively, for scrapping the sludge into the U-shaped sludge directing channel;
• whereby the water to be treated flows in order though the filtering unit, the bio-contact aeration unit and the settling unit, and is purified and desalinated.