PROCESS FOR REMOVING HARMFUL SUBSTANCES AND RECOVERING VALUABLE SUBSTANCES FROM A COKING PLANT WASTE WATER STREAM

PROCESS FOR REMOVING HARMFUL SUBSTANCES AND RECOVERING VALUABLE SUBSTANCES FROM A COKING PLANT WASTE WATER STREAM

A process is described for removing harmful substances and recovering valuable substances from the waste water stream of a coal processing plant. According to the invention, waste water produced in the coal conversion and in coke oven gas purification, preferably downstream of the NH3 stripped, is p...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: TIPPMER, KURT
Format: Patent
Sprache:eng ; ger
Schlagworte:
CHEMISTRY
METALLURGY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Beschreibung
Zusammenfassung:A process is described for removing harmful substances and recovering valuable substances from the waste water stream of a coal processing plant. According to the invention, waste water produced in the coal conversion and in coke oven gas purification, preferably downstream of the NH3 stripped, is passed directly to a fractional reverse osmosis (FRO) and is there separated into various aqueous fractions and the aqueous solution of harmful substances is concentrated in a one- or multi-step evaporation system (EDS) and the dissolved harmful substances are destroyed by means of a temperature-activated pressure hydrolysis (TDH) and the residual non-toxic salts are separated off from the hydrolysate by means of a crystallisation (KR).