do you know? Beijing Olympic Games will use sewage source heat, Qingdao City, trying to extract seawater as a heat source, Shenyang City, is starting to use sewage treatment plant sewage for residential heating. Sewage contains suspended solids and salts, such water can be used for heating it? Pipeline in the heating process will not block, scaling? What kind of area is suitable for using sewage source heating? May 17, the reporter interviewed Ding Hongyan, deputy director of the Municipal Environmental Protection Bureau. I ask: sewage heating safe? Reporter: Sewage flowing into the heating pipe, will cause corrosion? Ding Hongyan: At present, Shenyang City, seven sewage treatment plants have adopted biochemical treatment technology, water quality is better. It is the sewage source heat pump heat exchanger corrosion, scaling, plug the impact is also small. Shenyang plans to introduce and develop sewage heat pumps and energy-saving and corrosion-resistant heat transfer heat exchangers according to the characteristics of sewage water discharged from urban sewage treatment plants. Shenyang has implemented "safety clearance" for sewage heat pumps. Second question: Does the sewage block the pipeline? Reporter: sewage, after all, contains contaminants, will plug the pipeline and other equipment? Ding Hongyan: When untreated sewage is used as a source of water, suspended solids in the water may block the equipment. In order to solve this problem, according to the actual situation of Shenyang municipal sewage treatment plant, the water used is the treated sewage. Three questions: heating system all right? Reporter: Saving costs with sewage heating, Shenyang heating will completely change it? Ding Hongyan: Sewage source heat pump heating is only an addition to the city heat network, sewage source heat pump heating and thermal power plants, coal-fired boilers, groundwater heat pumps and other heating effective combination of ways to achieve multiple heat source combined heating. In this way, there will be no sewer source heat pump in Shenyang City and traditional heat sources to seize each other between the market. Fourth question: Whose house is heated by sewage? Reporter: What kind of district can use the sewage source heat pump? Ding Hongyan: Sewage treatment plants are located far away from the urban areas, if the sewage heating too far away from the user, it will increase the energy consumption, economic benefits will be greatly reduced. At present, Shenyang City, the implementation of sewage treatment plant sewage treatment as the center, with the corresponding radius of service. For example, Yu Hong New City newly developed residential area, from the Fairy River near the sewage treatment plant, the public in the region may be the first to benefit.