| Author | Doungporn Surasawait |
| Call Number | AIT Thesis no.EV-00-4 |
| Subject(s) | Agricultural wastes--Environmental aspects--Thailand--Ranong
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| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | The study concerned the environmental impacts of shrimp farming discharges on the receiving water and land quality in Ngao District, Ranong Province, Thailand. The sources of impact were primarily from discharged effluent and accumulated sediment. The quantity and quality of these discharges were monitored on two intensive shrimp ponds during one cycle of culture period upto 106 days. The study showed that discharged effluent during pond operation contained low organic loading, compared with that of discharged effluent during harvesting because of large volume involved. The major source of nutrients, organics, and solids could be attributed to sediment accumulated at the pond bottom which accounted for 98% of total waste loading. Effluent was discharged directly into drainage canals, but sediment was disposed of in an environmentally safe way by drying, scraping, and dumping in the empty pond. The receiving water quality in drainage canals, water supply canals, and Klong Ngao were monitored twice a month. The results show that discharged effluent from slu imp farm did not significantly deteriorate the natural water body in this area since the Klong Ngao has a high capacity of dilution and flushing as it experiences with semidiurnal and macrotidal conditions. All water quality variables meet the standard of seawater quality and did not show the significant fluctuations. Therefore, shrimp farming wastes appears unlikely to cause a significant impact on the Klong Ngao. Regarding land quality, soil analysis from shrimp pond area and mangrove area showed that soil in mangrove area remained unspoiled, but soil in shrimp pond area was degraded. High salinity and extreme acid soil were the significant impacts of land quality degradation. Although the impact on receiving water quality could not be obviously seen at the present, the continuous discharging of shrimp farm wastes can lead to the cumulative effect in the future. Waste prevention is therefore necessary for shrimp farming in this area in order to sustain the production of shrimp. Treatment system of effluent and sediment are recommended and improvement of pond management is necessary. |
| Year | 2000 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering and Management (EV) |
| Chairperson(s) | Annachhatre, Ajit P. |
| Examination Committee(s) | Lin, C. Kwei;Fukushi, Kensuke;Suwalee Chandrkrachang;Nielsen, Per H. |
| Scholarship Donor(s) | Nishihara Environmental Sanitation Research;Corporation Limited, Japan |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2000 |