WAVERLY, Virginia — Restoration Bioproducts’ executives and employees gathered with state and local officials Wednesday to celebrate the opening of the company’s Sussex County biochar production facility. Through a thermal decomposition process known as pyrolysis, the facility heats waste wood to high temperatures in an environment without oxygen to transform the material into syngas — a combustible gas that can be used for fuel —  and biochar, a charcoal-like substance commonly used to improve soil health, as an animal food additive, and as an odor absorber. …Restoration Bioproducts, which has its headquarters in Lynchburg, has hired a manager and seven employees to work at the Waverly plant, which cost nearly $10 million to build. …As production ramps up, more employees will be hired. “That’ll move us up to about 15 jobs,” Raines said.