Randolph is set to begin single-stream recycling next month, following the lead of nearby municipalities such as Braintree in implementing an automated pickup program to save the town money and increase the recycling rate. Officials say the new system is convenient for residents and environmentally friendly. As part of the transition, households will receive new 96-gallon recycling containers in November. All recyclable materials can be mixed in the blue rolling containers, which have lids and are expected to cut down on litter. They will be emptied by trucks equipped with mechanical arms, meaning they must be placed close to the curb and at least three feet away from mailboxes, cars, and other objects, officials said. Town Manager Dave Murphy said in a release that Randolph officials persuaded trash contractor Republic into providing the cost-saving service by linking it to a contract renewal. Officials hope automated pickup and single-stream recycling, along with the existing resident fee, will help chip away at the town’s $2.1 million annual expenditure on trash disposal, one of the largest line items in Randolph’s budget.