METHOD OF SEWAGE TREATMENT Russian patent published in 1997 - IPC

FIELD: sewage treatment. SUBSTANCE: method involves settling sewage up to formation resin and subresin fractions, removing resin fraction and addition of granulated acid adsorbent to subresin fraction. Acid adsorbent is obtained from clay minerals of laminated and laminated-band-shaped structure (granule size is 4-7 mm) followed by adsorbent neutralization with sodium hydroxide solution to pH = 7.0-9.0 and regeneration with ammonium hydroxide solution. Method can be used for sewage treatment from formaldehyde. EFFECT: improved method of treatment. 4 tbl