The present invention discloses an industrial solid waste incinerator and flue gas treatment apparatus, comprising a water-cooled feed hopper, a water-cooled grate and a chamber which are connected in sequence. A front arch, a rear arch and side walls which are formed of membrane water-cooled walls, are provided between the water-cooled grate and the chamber, and a dechlorination tower is arranged behind the chamber. Two sets of rear secondary air pipes, which comprise an upper set of rear secondary air pipes and a lower set of rear secondary air pipes, are arranged on the rear arch, and a dry desulfurization device is arranged between the two sets of rear secondary air pipes, so that the reaction medium and the flue gas are sufficiently disturbed and mixed, and stroke is extended.

A composite filter cartridge is adapted to filter raw water to produce purified water, and includes an inner carbon tube, an outer carbon tube, a first end cap, a second end cap, and a plurality of resin granules. The inner carbon tube defines a water outlet channel adapted to output the purified water. The outer carbon tube is concentric with the inner carbon tube, and is spaced apart from the inner carbon tube. The first and second end caps respectively limit two ends of the inner and outer carbon tubes. The first end cap closes an end of the water outlet channel. The second end cap has a water outlet communicating with the water outlet channel. The second end cap cooperates with the inner carbon tube, the outer carbon tube, and the first end cap to define a resin granule accommodation space where the resin granules are accommodated.