Geothermal Greenhouses on North China Coastal Plain and the Effect of Effluent on Environment

Abstract

China rich i n low temperature geothermal reeourcee particularly coaetal regione along Pacific Ocean. Planting vegetables i n geothermal greenhoueee for winter uee a new which up i n North China i n recent years. The festuree of the greenhouses are for tlie low night time temperaturee, and low of building which euitabie for the preeent agricultural situation i n China. Their social benefit evident. Owing to the limited the geothermal fluid can only be ueed i n direct heating syeterne and without inject ion welle. Thie r e e u l t e i n effecte of corroeion and effluent on the environment. The first concern t o maintain the natural flow and mineral content of and lakee, These are precious national reeourcee. The utilization of e o i l and on and chooeing of a cheap t o make t h e treated effluent eui table for irrigation are under