Running two firebase databases in angular 4 project

Question

I need to add another database to my existing angular 4 in my project. I use angularfire 2. I have an envirement.ts file containing my firebase configuration file (API key, authDomain ...)

This is part of my .module.ts application:

import { AngularFireModule } from 'angularfire2'; import { firebaseConfig } from '../environment'; import { AngularFireDatabaseModule } from 'angularfire2/database'; @NgModule({ declarations: [ MyApp ], imports: [ BrowserModule, AngularFireModule.initializeApp(firebaseConfig), AngularFireDatabaseModule, ... 

How to add an independent database to my application?