Biochemical engineering is a department of Chemical Engineering that mainly deals with the design and construction of unit operations that involve biological organisms or molecules, such as bioreactors. Its applications are in the petrochemical industry, food and pharmaceutical, biotechnology, and water treatment industries. A bioreactor may also refer to a device meant to grow cells or tissues in the ambience of cell culture. These devices are being developed for use in tissue engineering or biochemical engineering. Different types of Bioreactors are Photo bioreactor, Sewage treatment, Up and Down agitation bioreactor, NASA tissue cloning bioreactor, Moss bioreactor. Orthopaedic applications form the largest division of the overall biomaterials market. Polymer-based biomaterials are expected to initiate the next wave of market growth; and the future biochips and biosensors business segments also offer huge growth potential.