In nature with some process is spontaneous. But is not desirable. For example, the formation and the salt content of the soil contains far more than formed by ice and snow melt water content; Salt can be automatically from high levels to low levels of integration. Making chemistry in addition to the brine or polymeric ferric sulfate in water reverse osmosis treatment to the raw water to remove these into salt, this requires energy to achieve. Thermodynamics indicates that in any process, energy is not eternal, can be changed; Life common sense: by high temperature to low temperature in heat transfer, water flows from high to low, the fuel gas from high pressure to low pressure, potential difference made the current through the wire and equipment. But many engineering process is to and the direction of spontaneous. Except for the salt dissolving and desalination of the example, in the air conditioning system with refrigerant and heat exchange system to make indoor heat transfer to the higher temperature of outdoor; Pump can put the low pressure gas to smoke to higher areas.

In engineering, though gravity filter can be realized without adding pressure water filtration, but using a powered tubular filter or filter membrane filtering effect is better. Osmosis phenomenon that as the solvent of water molecules through a semipermeable membrane into concentrated solution, it is a spontaneous process; But in order to meet the demands of desalination, exerting force moves from the water molecules in the solution, formed a strong reverse osmosis membrane process and reverse osmosis water treatment technology. By the thermodynamic point of view is the study of the production of iron ore is spontaneous. Will produce its smelting iron law need to heat energy. Iron and steel products in use process, because of the climate effects from corrosion, corrosion due to thermal and chemical factors, make its true colors of the recovery of iron ore, return to nature, is spontaneous. Therefore, corrosion effect happen automatically, the corrosion is very difficult.

In family life. To pay money. Buy power. The fuel gas, heat and treated water. From a consumer perspective. Money is automatically, if you don t pay the money, will not for lighting, cooking, bright and warm washing. But make full use of solar energy, small system in order to obtain energy from household can get bright and warm, and save a lot of costs. So people live a sunny room, the use of solar water heaters, to reduce spending. Inspired by the researchers. The fact that designers in the small system for the power, save engineering cost.

In coal-fired power plant, the polymeric ferric sulfate chemical desalination process of power consumption is larger, & pump noise is quite strong. But saw no in a coastal tourist city of the original water pump. Fresh water pump - flushing (including backwashing) pumps and decarbonization after the middle of the water pump, and in addition to salt water pump system.

The plant raw water alkalinity is not exceed 0.7 m mol/L, eliminating the decarburization blower, eliminate the noise of air friction at the same time, relying on the city tap water pressure to complete water desalination technology and storage in addition to salt water, in addition to salt water controlled uniformly added to the condenser. Ensure the oxygen content of qualified.

In water treatment engineering, the use of solar energy and the external power to reduce water treatment cost, improve the water quality of product and is possible to create a beautiful work environment, researchers and designers should try to seek. Water treatment equipment manufacturers also should fully consider in the product. All kinds of low pressure reverse osmosis membrane. Energy-saving membrane and the pollution of all kinds of membrane element, is to apply the principles of thermodynamics.