OMJASVIN M D ByExpress News ServiceCHENNAI: In a welcome step towards achieving ‘Zero Waste Chennai’ target, the Manali Zone of City Corporation is using ash residue from its dry waste incineration plant to make eco-friendly bricks for pavement construction and masonry works. City’s first ever dry-waste incineration plant, which started functioning in its full capacity last week, generates 2 per cent ash for every 10 tonnes of waste burnt. For every 10 tonne waste burnt, we make 60 bricks,’’ said a top Corporation official. Officials said using ash into building concrete bricks will not just keep the zone zero waste but also reduce dependency on mud bricks. A piece of mud brick costs around `5 while the concrete bricks could be sold for around `3..