Assessing the impact of a landfill leachate on a Canadian waste water treatment plant

Abstract

In the late 1980s, the Erb Street landfill, located in Waterloo, Ontario, Canada, had a very large leachate mound, thus a perimeter toe-drain system was installed. The leachate was sent to the Waterloo Waste Water Treatment Plant via the sewer system. This study investigated possible effects of the leachate on the treatability of the sewage with respect to oxygen demand, BODs loading, nitrification capacity, and the metal concentrations in the sewage biosolids. The quantitity of leachate produced at the landfill and its contaminant concentrations were predicted and compared with measured values. Based on the predictions, it was shown that the leachate strength would not exceed its current strength in the future. The average BOD; and ammonia loads of the leachate were estimated to represent -2% of the total loads of the sewage. Also, the leachate metal contribution to the sewage was significant.

Landfill leachate treatment: Review and opportunity

“…Moreover, the effluent quality may be improved with powdered activated carbon (PAC) addition, particularly if the leachate input exceeds 10%. Other researchers (Table 5) studied the co-treatment of leachate and sewage [10,48,49] and showed similar results.…”

Determining toxicity of leachates from Florida municipal solid waste landfills using a battery‐of‐tests approach

“…The state has 61 Class I landfills (permitted to accept only municipal solid waste) that are lined and actively collect all leachates generated for biological treatment. Researchers have extensively characterized the chemical and physical composition (Booth et al, 1996;Gettinby et al, 1996;Townsend et al, 1996) and the toxicity (Plotkin and Ram, 1984;Ernst et al, 1994;Ferrari et al, 1999) of waste leachates around the world. Landfill leachates are a complex mixture of inorganic (e.g., heavy metals, ammonia) and organic (e.g.…”

Avaliação da eficiência de remoção de DQO, nitrogênio e fósforo no cotratamento de esgoto com lixiviado em sistema de lodos ativados

“…Facchin et al (2000) apresentaram os resultados de 22 meses de monitoramento do tratamento combinado de esgoto sanitário e lixiviado, com uma proporção de 3,2% em volume, em uma lagoa de estabilização, tendo sido verificada a necessidade de controle do nitrogênio amoniacal para a manutenção da estabilidade do processo. Booth et al (1996) estudaram o cotratamento realizado em uma estação de tratamento do tipo lodos ativados em Waterloo (Ontário/Canadá) com valor médio de mistura lixiviado/esgoto de 0,14%, na qual os autores correlacionaram a adição do lixiviado ao aumento dos requisitos de oxigênio no tanque de aeração e a um aumento na geração de lodo.…”