Mark Roberts of Graig Gellinudd, Pontardawe, was first convicted of illegally burning waste last June. He was given a four-month prison sentence, but it was suspended for two years.
The Environment Agency discovered he was still burning waste last August when it received numerous complaints from members of the public about smoke from his site.
Agency officers undertook covert surveillance and saw Mr Roberts bring significant amounts of waste onto the site and set it alight.
Appearing before Neath magistrates on 11 January, Mr Roberts pleaded guilty to four charges of depositing and disposing of controlled waste without a licence, contrary to sections 33(1) and 33(6) of the Environmental Protection Act 1990. He also pleaded guilty to transporting controlled waste without a registration, contrary to section 1 of the Control of Pollution (Amendment) Act 1989.
He was sentenced to jail for four months, to be served consecutively with the suspended sentence.