Patent · US Active

Method for removing calcium ions from high concentration organic wastewater

US11999642B2 · kind B2 · utility

0Cited by

1References

6Claims

0Family size

Assignee

TONGJI UNIVERSITY · CN

Inventors

Pinjing He · Shanghai, CN
Junjie Qiu · Shanghai, CN
Liming Shao · Lincoln, US
Fan Lyu · Shanghai, CN
Hua Zhang · Shanghai, CN

Key dates

Filing date	Nov 25, 2019
Grant date	Jun 4, 2024
Priority date	—
Expiry date	Sep 10, 2041

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC02F2209/06
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

A method for removing calcium ions from high concentration organic wastewater is provided. The method comprises the steps of: (1) introducing high concentration organic wastewater containing Ca2+, inorganic carbon and a seed crystal into a reactor with a molar ratio of Ca2+ to inorganic carbon of 1:(3.2-6.2); (2) adjusting the hydrogen ion activity α(H+) and ionic strength of the solution in the reactor; (3) sequentially stirring and precipitating in the reactor to convert Ca2+ in the high concentration organic wastewater into calcium carbonate which is then precipitated for calcium removal.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.