The couple enjoyed a white wedding on a Caribbean beach last week after deciding to reaffirm their commitment to each other.
Palmer and Merkell originally tied the knot in 2000 shortly after the premature birth of their son Fenton.
Reflecting on the original ceremony, Palmer told Hello: "When I married Richard, everything was such a rush. I'd just given birth to Fenton prematurely at 32 weeks and he had to stay in hospital.
"We went to register Fenton's birth at Chelsea Register Office and out of all the gloom and worry we wanted to do something really lovely and get married.
"I was still big from my pregnancy so I didn't wear a proper wedding dress, just a baggy cotton frock, and we never even bothered with wedding photos."
Palmer added that the Caribbean wedding was "every bit a celebration of our lives and love for each other".
She explained: "We wanted a simple but spiritual ceremony with lots of fun and laughter and to take away some really lovely happy memories, as well as make the children feel secure. It was exactly that and more. I feel really blessed.
"I think every married couple should do it every ten years. It is so easy to get divorced now but much harder to stay married."
Mum-of-four Palmer is currently on a six-month break from EastEnders. Viewers will see her character Bianca Butcher depart screens on Friday (April 27).
> EastEnders' Patsy Palmer explains soap break: 'It's a full-on job'
> EastEnders' Patsy Palmer: 'I want another four children'
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