Protection of food crops during rapid development of the Palinpinon Geothermal Project
- KRTA Ltd., Auckland, New Zealand
A tropical water plant known as kangkong is cultivated in the Okoy River. Many hundreds of people are involved in growing this important green vegetable which is harvested up to 12 times per year, hence the need to avert major damage to crops is clear. Trials suggest that kangkong is sensitive to lower levels of arsenic than boron, but because of the relative amounts of these elements in geothermal waters boron is likely to be the limiting element in regard to surface waste-water discharges. Arsenic or boron toxicity symptoms were more severe in the presence of sulphate, while high calcium levels delayed the onset or reduced the severity of the symptoms. Plants tolerated thermal shocks up to about 50/sup 0/C for 30 minutes. Under the test conditions the maximum continuously tolerable level of geothermal fluid was about 8% and of As and B about 3 mg/kg and 5 mg/kg, respectively. For purposes of crop protection during project development, however, wastewater discharges from wells under test are normally regulated so that the level of B upstream of the cropping area does not normally exceed about 3 mg/kg.
- OSTI ID:
- 6656385
- Report Number(s):
- CONF-811015-
- Journal Information:
- Trans. - Geotherm. Resour. Counc.; (United States), Vol. 5; Conference: Geothermal Resources Council annual meeting, Houston, TX, USA, 25 Oct 1981
- Country of Publication:
- United States
- Language:
- English
Similar Records
Boron toxicity of coal mining areas in southwestern Wyoming
Heavy metal toxicity to crops grown in sewage sludge amended soil
Related Subjects
GEOTHERMAL FLUIDS
WATER POLLUTION
GEOTHERMAL POWER PLANTS
ENVIRONMENTAL IMPACTS
AQUATIC ORGANISMS
ARSENIC
BORON
CULTIVATION
PHILIPPINES
VEGETABLES
VIABILITY
WASTE WATER
ASIA
DEVELOPING COUNTRIES
ELEMENTS
FLUIDS
FOOD
HYDROGEN COMPOUNDS
ISLANDS
LIQUID WASTES
OXYGEN COMPOUNDS
POLLUTION
POWER PLANTS
SEMIMETALS
THERMAL POWER PLANTS
WASTES
WATER
150600* - Geothermal Energy- Environmental Aspects
150800 - Geothermal Power Plants