{"id":"S85145493","label":"Water--Purification--Nitrogen removal","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh85145493","normalized_label":"water--purification--nitrogen removal","broader":["http://id.loc.gov/authorities/subjects/sh86001979"],"aliases":["Nitrogen removal (Water purification)"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh85145493","provider":"lcsh","revision":"3404c2c4e25dac62","taxonomy_revision":"f050b5d4780b1289","title":"Water--Purification--Nitrogen removal","url":"/topics/S85145493","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"867026492293793344","address_version":"morton4x16-v1","coordinates":[0,20,19678,21504],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}