Earlier this year, the GMB and Veolia agreed an 8% pay rise over two years and a £750 bonus for all staff at the depot.
Peter Davies of the GMB said previously: “Rights have been hard-fought for over recent decades, and our reps and members will not give them up. We have good terms and conditions.
“We won’t give in to any union-busting attempts whether that is by an employer or, sadly, another trade union.”
A GMB spokesperson added that its members had remained united both in the union and in their work.
“Bins are being emptied across the city as normal. It’s hard to see what the point of it all is,” they added.
Sheffield City Council said the strike had had minimal impact on bin collections and recycling.
Councillor Joe Otten, chair of the environmental services committee, said previously: “Veolia are willing to work with both unions however the GMB must approve this change, and no agreement has been reached.”
In July, Veolia began legal action against Unite and Ms Graham, saying they had launched a “defamatory campaign” against its employees, partners and investors.
The company said it was standing up to the union’s “excessive tactics” and had not taken the decision lightly.
Unite said it “completely and utterly” denied any allegation of defamation.