In many parts of the developing world, leachate treatment system is not properly installed and managed that landfill
leachate usually flows into existing water bodies. Consequently, heavy metal in leachate could lead to
biomagnification of heavy metals as the components travel higher within the food chain. Thus, it is necessary to
understand the characteristics of leachate and its toxicity potential prior to its release to the water bodies. This paper
aims to determine the toxicity effect of different types of landfill leachate on Anabas testudineus. Also, the
behavioural changes towards leachate toxicity will be recorded. To achieve the objectives, toxicity tests were
conducted on A. testudineus. It involved three main stages namely acclimatisation, range finding test, and short-term
definitive test. For the purpose of the study, leachate samples were collected from an active sanitary landfills and a
closed sanitary landfill. Ten A. testudineus with average weight of 4.2g and average length of 4.0cm were introduced
into leachate with five different concentrations ranging from 3.125% to 5.625%. The mortality rate was observed and
recorded after 96 hours exposure. The LC50 of A. testudineus was calculated using EPA Probit software. Leachate
from non-active landfill is alkaline (pH 8.2) as compared to that of the active landfill (pH 7.35). As expected, COD
from the closed landfill is much lower (10,000mg/l) than the active landfill (24,800 mg/l) while the BOD5 was
3,500mg/l and 12,500mg/l, respectively. However, the result of ammoniacal nitrogen was highly different between
these landfills, where closed landfill is releasing higher concentration of ammoniacal nitrogen (880mg/l) than the
active landfill (0.085mg/l). The toxicity test indicated that both landfill leachates are highly toxic to A. testudineus. In
fact, leachate from the closed landfill was more toxic than leachate from the active landfill. Results indicated that the
LC50 of the leachate from closed landfill on A. testudineus was 4.71% v/v while LC50 of the leachate from active
landfill was 5.1%. Discolouration of exposed fishes was observed in the study, and it could be due to the loss of
colouring pigment caused by ammonia poisoning. Other observation of behavioural changes included swimming
disorder, loss of equilibrium, unusual leaping action, and declination in the general activities. These are most
probably due to neurotoxin effect inflected by the leachate exposure. In conclusion, leachate from active and nonactive
landfills is toxic to A. testudineus based on the behavioural changes and the high mortality rate
In many parts of the developing world, leachate treatment system is not properly installed and managed that landfillleachate usually flows into existing water bodies. Consequently, heavy metal in leachate could lead tobiomagnification of heavy metals as the components travel higher within the food chain. Thus, it is necessary tounderstand the characteristics of leachate and its toxicity potential prior to its release to the water bodies. This paperaims to determine the toxicity effect of different types of landfill leachate on Anabas testudineus. Also, thebehavioural changes towards leachate toxicity will be recorded. To achieve the objectives, toxicity tests wereconducted on A. testudineus. It involved three main stages namely acclimatisation, range finding test, and short-termdefinitive test. For the purpose of the study, leachate samples were collected from an active sanitary landfills and aclosed sanitary landfill. Ten A. testudineus with average weight of 4.2g and average length of 4.0cm were introducedinto leachate with five different concentrations ranging from 3.125% to 5.625%. The mortality rate was observed andrecorded after 96 hours exposure. The LC50 of A. testudineus was calculated using EPA Probit software. Leachatefrom non-active landfill is alkaline (pH 8.2) as compared to that of the active landfill (pH 7.35). As expected, CODfrom the closed landfill is much lower (10,000mg/l) than the active landfill (24,800 mg/l) while the BOD5 was3,500mg/l and 12,500mg/l, respectively. However, the result of ammoniacal nitrogen was highly different betweenthese landfills, where closed landfill is releasing higher concentration of ammoniacal nitrogen (880mg/l) than theactive landfill (0.085mg/l). The toxicity test indicated that both landfill leachates are highly toxic to A. testudineus. Infact, leachate from the closed landfill was more toxic than leachate from the active landfill. Results indicated that theLC50 of the leachate from closed landfill on A. testudineus was 4.71% v/v while LC50 of the leachate from activelandfill was 5.1%. Discolouration of exposed fishes was observed in the study, and it could be due to the loss ofcolouring pigment caused by ammonia poisoning. Other observation of behavioural changes included swimmingdisorder, loss of equilibrium, unusual leaping action, and declination in the general activities. These are mostprobably due to neurotoxin effect inflected by the leachate exposure. In conclusion, leachate from active and nonactivelandfills is toxic to A. testudineus based on the behavioural changes and the high mortality rate
การแปล กรุณารอสักครู่..