Members of the Unison union are picketing FCC’s Wilmington waste transfer station in Hull as part of a campaign to improve the company’s sick pay.
A two-week strike was called on 29 March. It is the second round of industrial action, after a week-long strike at the beginning of March.
Unison Hull City branch secretary Adrian Kennett said: “Despite the company’s significant profits, it refuses to pay the workers who make [those] profits decent pay and conditions.”
Unison said one of its members had been denied sick pay after being diagnosed with cancer, and that FCC had refused to include the matter in pay talks.
The union added that the company had not increased a pay offer of 2.5%, which came into effect on 1 April.
Unison said its members had been left with no choice but to take industrial action.
An FCC spokesperson said: “We have had a further meeting with the union to try to resolve the situation. Our offer is a fair offer and it still stands.”