Abstract
The study reports the results of a laboratory scale investigation aimed at evaluating the effectiveness of mature municipal landfill leachate treatment by a biological stage (used SBBR as a biological treatment) and Chemical precipitation (Used MAP precipitation (magnesium ammonium phosphate)) to study the nitrogen removal capabilities for treatment of sanitary landfill leachate containing high ammonia concentration, and the comparison between them. The monitored sample taken from the Chang Sheng bridge landfill site in Chongqing city-China, has its concentrations of COD, BOD5, and NH3-N about 1650, 75 and 1100 mg/l respectively. The results from SBBR showed that after two months long period of domestication and one month period of stability, the ammonia nitrogen removal efficiency reached to 99% in the SBBR reactor, at nitrogen loading rate 0.51 kg TN/m3 per day and HRT was 9 hours, met to Chinese standards for discharge. The results of the MAP precipitation was technically effective to remove the high NH3-N strength of over 1100 mg/l from the raw leachate at molar ratio of Mg2+: NH4+: PO4-3 of 1:1:1, they demonstrated a very satisfactory removal of ammonia; an initial NH3+-N concentration of 1100 mg/l contained in the raw leachate was quickly reduced to 28 mg/l within 15 min, while the pH producing a maximum removal of ammonia was 9.0. The percent removal of ammonia after treatment by MAP was 97.5%.
Highlights
Sanitary landfill is an engineered of disposing solid wastes that minimizes environmental hazards[1]
The objective of this study was to evaluate the possibility of using Sequencing Batch Biofilm Reactor (SBBR) as a biological treatment and MAP precipitation as a chemical treatment to remove the ammonia from old landfill leachate, and comparison between them
Use of SBBR system to remove ammonia (NH3-N) as a biological treatment of the old landfill leachate: Each cycle of the SBBR was divided into fill, react and draw periods
Summary
Sanitary landfill is an engineered of disposing solid wastes that minimizes environmental hazards[1]. Landfill leachate is a complicated waste, and it always contains high strength pollutants which have an adverse effect on the environment[3]. It has been generally known as a highstrength wastewater that is most difficult to deal with. This is due primarily to its large variability of organic, inorganic and heavy metal contents, strongly depending on the age and type of solid wastes of a landfill site[4]. The water causes leaching of soluble salts and partly biodegraded organic compounds, responsible for a foul-smelling, darkcolored leachate It may contain fine particles of soil from the daily cover. The system becomes anaerobic following rapid depletion of oxygen, much cooler and for less reactive[5]
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