Treatment options for the shrimp farms sediments | |
| Author | Bussarin Khongseri |
| Call Number | AIT Thesis no. EV-02-5 |
| Subject(s) | Sewage--Purification Ponds |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science. School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. EV-02-5 |
| Abstract | Because of the more significant demand, shrimp farming is highly dispersed and decentralized especially in the southern and eastern parts of Thailand. The average shrimp production could be counted to 7 ,250 kg/ha/year. So, many problems arise in most production areas. The decrease in productivity of aquaculture sites was a common result of over intensification leading to the deterioration of the sun-ounding environment and pond sediment quality. Wastes loading from the sediment are 17 g COD/kg DM, 0.32 g P/kg DM and 0.66 g N/kg DM. The sediments were saline in nature, having salinity value about 2.88 g/kg DM and also contained total solids of 221g/kg DM. These loading can be affected to the water and soil quality in nearby area. Thus, the proper treatment method should be undertaken to eliminate the impact of disposed sediment. Anaerobic digestion method was selected as an option for anaerobic treatment. The anaerobic digester was started up with ethanol synthetic wastewater for 25 days with acclimatized sludge. The COD removal efficiency was 75-90% with low gas production, 1- 4 L/day. But due to the long startup period, gas leakage, high concentration of VF A in the rector, and improper mixing condition, which leading to the low methane yield, the shrimp farm sediment was not fed to the reactor On the other hand, batch washing of sediments combined with Activated sludge (AS) process was selected as an option for aerobic treatment. Before starting up, the batch test on the effect of sediment concentration of 5, 10, 15, 20 and 25% was carried out. The results showed that the increase of sediment concentration resulted to the increase of pollutant concentration. But it had no consequence on the number of washing. Then batch test on the effect of pH from 4, 5.5, 7, 8.5 and 10 was also done. But pH variation also did not have any effect to the concentration of pollutant that was washed out from the sediment. For the batch washing of sediments combined with AS process, it was started up with glucose synthetic wastewater for 14 days. The COD and nitrogen removal efficiency were around 80-90 %. At steady state, the mixture of 25% sediment was fed to the reactor, which contributed to the decrease of removal efficiency to 30-50 % for both COD and nitrogen. This research study suggested that the batch washing of sediments combined with AS process could be effectively used for treatment of accumulated shrimp farm sediment. |
| Year | 2002 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis; no. EV-02-5 |
| 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) | Chettiyappan Visvanathan ;Trankler, Josef |
| Scholarship Donor(s) | Royal Thai Government |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2002 |