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The processes used to remove water from biosolids and change their form from a liquid to a damp solid are critical to the operation of other downstream processes in wastewater treatment . ( Evaporate means to go from a liquid to a gas . The increase in temperature also makes it easier for the individual molecules in a water droplet to overcome their attraction to one another and move from a liquid to a gas state . Especially look for what happens to liquid water as it changes from a liquid to a solid and from a solid to a liquid . As soon as the product is put into any form of packaging , such as bottles , jugs , IBCs , 55-gallon drums or other containers , the product is converted from a liquid to a discrete item ( the package ) for logistics and supply chain purposes .