Despejar PostgreSQL sem proprietário e privilégios

$ pg_dump database_name -O -x > output_file

Então você não deveria ver

--
-- Name: public; Type: ACL; Schema: -; Owner: username
--

REVOKE ALL ON SCHEMA public FROM PUBLIC;
REVOKE ALL ON SCHEMA public FROM username; 
GRANT ALL ON SCHEMA public TO username;
GRANT ALL ON SCHEMA public TO PUBLIC;

E

--
-- Name: _RETURN; Type: RULE; Schema: public; Owner: username
--