EP 0000861 B1 19810812 - PROCESS FOR THE PURIFICATION OF ORGANICALLY POLLUTED, CALCIUM CONTAINING WASTEWATER
Title (en)
PROCESS FOR THE PURIFICATION OF ORGANICALLY POLLUTED, CALCIUM CONTAINING WASTEWATER
Publication
Application
Priority
DE 2738309 A 19770825
Abstract (en)
[origin: US4227998A] For the treatment of wastewaters containing substantial BOD and substantial calcium ion concentrations, e.g., effluents from the washing and flushing cycles of sugar manufacturing plants, by an activated sludge process, under aeration with an O2-containing gas, the improvement which comprises introducing a CO2-containing gas having a concentration of CO2 higher than that of air into liquid present in the activated sludge system to precipitate calcium ion as calcium carbonate thereby lowering the pH of the liquid and facilitating the separation of the activated sludge solids and the bacterial action of the activated sludge process.
IPC 1-7
IPC 8 full level
CPC (source: EP US)
C02F 3/1215 (2013.01 - EP US); C02F 3/26 (2013.01 - EP US); Y02W 10/10 (2015.05 - EP US)
Designated contracting state (EPC)
BE FR GB NL
DOCDB simple family (publication)
EP 0000861 A1 19790307; EP 0000861 B1 19810812; BR 7805506 A 19790417; DE 2738309 A1 19790315; IT 1098172 B 19850907; IT 7826869 A0 19780821; US 4227998 A 19801014; ZA 784822 B 19790829
DOCDB simple family (application)
EP 78100051 A 19780601; BR 7805506 A 19780824; DE 2738309 A 19770825; IT 2686978 A 19780821; US 93383878 A 19780815; ZA 784822 A 19780824