Bioremediation of sediments from intensive aquaculture shrimp farms by using calcium peroxide as slow oxygen release agent.
A viable treatment procedure was developed in this research with calcium peroxide (CaO2) as a slow oxygen (O2) release agent for bioremediation of polluted sediments from intensive shrimp farms containing high organic carbon, nitrogen and phosphorus. Experiments with sediment treatment by CaO2 were carried out with, as well as without, biomass seeding at pH ranging from 6.5 to 8.5. The sediment treatment applying CaO2 without seeding yielded a BOD5, organic-C and organic-N removal up to 95%, 17.6% and 75%, respectively compared to the removal of 66%, 8.6% and 57%, respectively in the controlled treatment without CaO, addition. The investigations were also carried out with CaO2 dosage with biomass seeding at different food-to-microorganisms (F/M) ratio between 0.1 and 0.25. The BOD, organic-C and organic-N removal up to 92%, 17.6% and 73%, were achieved for a F/M ratio 0.1. The experimental results indicated complete organic-P removal within 5-7 days of treatment without seeding and within the initial 2 days of treatment with seeding. The present research revealed that, the application of CaO2 could enhance the degradation of organic-C, organic-N and organic-P during the treatment of polluted sediment.
Hanh
D N
DN
Environmental Engineering and Management, Asian Institute of Technology, PO Box 4, Klongluang, Pathumthani 12120, Thailand.
Rajbhandari
B K
BK
Annachhatre
A P
AP
D000818:Animals; D017756:Aquaculture; D001673:Biodegradation, Environmental; D002118:Calcium / Q000737:chemistry / Q000302:isolation & purification; D019015:Geologic Sediments / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry* / Q000302:isolation & purification; D010100:Oxygen / Q000737:chemistry; D033561:Penaeidae; D010545:Peroxides / Q000737:chemistry*; D010758:Phosphorus / Q000737:chemistry* / Q000302:isolation & purification
D010545:Peroxides; D010758:Phosphorus; C403632:calcium peroxide; D009584:Nitrogen; D010100:Oxygen; D002118:Calcium