Nitrogen removal from latex concentrate effluent using the anoxic/oxidation ditch process: a laboratory study

Nordin Bin Ab Kadir Bakti, . Nitrogen removal from latex concentrate effluent using the anoxic/oxidation ditch process: a laboratory study. pp. 211-223. ISSN 0127-7065

Existing oxidation ditches treating rubber effluent can effectively remove organics and ammonia if fully aerated but they do not easily achieve denitrification of the nitrate formed from ammonia. A laboratory study was carried out to investigate the possibility of improving nitrogen removal and lowering the energy requirements for oxygenation in the oxidation ditch system by incorporating a pre-anoxic reactor and recycling of the nitrified effluent. The hydraulic retention time (HRT) of the anoxic reactor was varied from 0.98 days to 1.54 days the mean cell retention time (MCRT) of the oxidation ditch from 4.43 days to 6.59 days and the ratio of effluent recycle to raw effluent flow rate (r) from 1.25 to 6.0. Under the best conditions investigated (anoxic reactor HRT of 0.98 days oxidation ditch MCRT of 6.59 days and r of 3.5) the laboratory unit was capable of removing 99 percent biochemical oxygen demand 99 percent ammonium nitrogen and 86 percent total nitrogen comprises both the total Kjeldahl nitrogen (TKN) and the total oxidised nitrogen. A mathematical model for the process was developed and model coefficients evaluated. The model coefficients except for those pertaining to TKN removal in the anoxic reactor were statistically significant at probability level 0.1. Malodour due to sulphate reduction to hydrogen sulphide in the anoxic reactor was not a problem because nitrate was preferentially utilised.

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Abstract

Existing oxidation ditches treating rubber effluent can effectively remove organics and ammonia if fully aerated but they do not easily achieve denitrification of the nitrate formed from ammonia. A laboratory study was carried out to investigate the possibility of improving nitrogen removal and lowering the energy requirements for oxygenation in the oxidation ditch system by incorporating a pre-anoxic reactor and recycling of the nitrified effluent. The hydraulic retention time (HRT) of the anoxic reactor was varied from 0.98 days to 1.54 days the mean cell retention time (MCRT) of the oxidation ditch from 4.43 days to 6.59 days and the ratio of effluent recycle to raw effluent flow rate (r) from 1.25 to 6.0. Under the best conditions investigated (anoxic reactor HRT of 0.98 days oxidation ditch MCRT of 6.59 days and r of 3.5) the laboratory unit was capable of removing 99 percent biochemical oxygen demand 99 percent ammonium nitrogen and 86 percent total nitrogen comprises both the total Kjeldahl nitrogen (TKN) and the total oxidised nitrogen. A mathematical model for the process was developed and model coefficients evaluated. The model coefficients except for those pertaining to TKN removal in the anoxic reactor were statistically significant at probability level 0.1. Malodour due to sulphate reduction to hydrogen sulphide in the anoxic reactor was not a problem because nitrate was preferentially utilised.

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Item Type:	Article
Additional Information:	5 ill.; 3 tables; 15 ref. Summary (En). Appendix
AGROVOC Term:	CAUCHO
AGROVOC Term:	AGUAS RESIDUALES
AGROVOC Term:	AMONIACO/ OXIDACION
AGROVOC Term:	DENITRIFICACION
AGROVOC Term:	NITRATOS
AGROVOC Term:	EXPERIMENTOS EN LABORATORIO
AGROVOC Term:	AIREACION
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:55
URI:	http://webagris.upm.edu.my/id/eprint/19967

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