Currently, around the world municipal solid wastes creating a serious risk to human health and the environment; the cheapest and commonly used management technologies for these wastes are landfilling or combustion. However, landfill releases methane and other greenhouse gases, also it has potential to pollute surrounding soil and groundwater. On the other hand, municipal solid wastes can be processed via hydrothermal liquefaction technology to convert agricultural, kitchen and other organic waste streams into bio-crude oil that is environmentally green and carbon neutral.