A portable sewage water treatment system comprising sewage water intake means adapted to receive untreated sewage water and to direct it into said treatment system in a sewage water stream; a clarifier coupled to said sewage water intake means said clarifier having a tank having a vertical axis extending between a top and a bottom; tank walls (81, 83, 84) surrounding said vertical axis and defining a clarifier interior, said tank walls (81, 83, 84) further defining a holding chamber disposed adjacent said top, said holding chamber having substantially vertical, cylindrical sides extending a spaced distance below said top; and a circulating chamber disposed below said holding chamber and extending to said bottom, said circulating chamber having substantially conical walls converging at a select angle relative to said vertical axis from adjacent said holding chamber to adjacent said bottom; a sewage water stream injection port coupled to said circulating chamber adjacent said bottom and in fluid communication with said clarifier interior; and header means disposed within said holding chamber and adapted to siphon a treated sewage water stream of treated sewage water from said clarifier; a disinfector coupled between said sewage water intake means and said clarifier and adapted to non-biologically disinfect said sewage water, said disinfector having: acid injection means (50 to 55, 15, 15A, 15B) coupled downstream of said sewage water intake means and adapted to inject into said sewage water stream a select acid compound selected from a group of acid compounds; alkaline injection means (61, 63, 17) coupled downstream of said acid injection means (50 to 55, 15, 15A, 15B) and adapted to inject into said sewage water stream a select alkaline compound selected from a group of alkaline compounds; and neutralizer injection means coupled downstream of said alkaline injection means (61, 63, 17) and adapted to inject a pH neutralizer into said sewage water stream; flocculation means (56, 58, 16) coupled downstream of said disinfector and between said disinfector and said clarifier and adapted to cause solid materials suspended in said sewage water to precipitate out of solution and to clump together for removal; polymer treatment means (66, 68, 18) adapted to treat said sewage water to discourage flocculated solid materials from sticking to said tank walls (81, 83, 84) within said clarifier interior; and filtering means (30, 35, 36) coupled to said header means and adapted to filter said treated sewage water from said clarifier. a vertical axis extending between a top and a bottom; tank walls (81, 83, 84) surrounding said vertical axis and defining a clarifier interior, said tank walls (81, 83, 84) further defining a holding chamber disposed adjacent said top, said holding chamber having substantially vertical, cylindrical sides extending a spaced distance below said top; and a circulating chamber disposed below said holding chamber and extending to said bottom, said circulating chamber having substantially conical walls converging at a select angle relative to said vertical axis from adjacent said holding chamber to adjacent said bottom; a sewage water stream injection port coupled to said circulating chamber adjacent said bottom and in fluid communication with said clarifier interior; and header means disposed within said holding chamber and adapted to siphon a treated sewage water stream of treated sewage water from said clarifier; a holding chamber disposed adjacent said top, said holding chamber having substantially vertical, cylindrical sides extending a spaced distance below said top; and a circulating chamber disposed below said holding chamber and extending to said bottom, said circulating chamber having substantially conical walls converging at a select angle relative to said vertical axis from adjacent said holding chamber to adjacent said bottom; a sewage water stream injection port coupled to said circulating chamber adjacent said bottom and in fluid communication with said clarifier interior; and header means disposed within said holding chamber and adapted to siphon a treated sewage water stream of treated sewage water from said clarifier; acid injection means (50 to 55, 15, 15A, 15B) coupled downstream of said sewage water intake means and adapted to inject into said sewage water stream a select acid compound selected from a group of acid compounds; alkaline injection means (61, 63, 17) coupled downstream of said acid injection means (50 to 55, 15, 15A, 15B) and adapted to inject into said sewage water stream a select alkaline compound selected from a group of alkaline compounds; and neutralizer injection means coupled downstream of said alkaline injection means (61, 63, 17) and adapted to inject a pH neutralizer into said sewage water stream;