Variation in biological and physicochemical parameters of the soil affected by uncontrolled landfill sites

Abstract

Defining the biological and physicochemical parameters in soil under illegally dumping sites provides information on the real threat and the direction of changes in the soil environment. The aim of the study was to investigate the effect of uncontrolled dump sites which differed in the composition of the waste deposited on the development of selected groups of soil microorganisms and the activity of redox enzymes and selected physicochemical soil parameters. Additionally, it was verified whether the biological and physicochemical parameters differ in soil depending on the depth (0-20 and 20-40 cm). The research covered three waste landfill sites (W1, W2, W3), the arable field (A) found in the zone of the effect of the dumping site as well as the control point (C). The microbiological analyses show that most amylolytic microorganisms (87.0 9 10 5 cfu), celullolytic (46.4 9 10 5 cfu), proteolytic (148.6 9 10 5 cfu) and bacteria in total (123.2 9 10 5 cfu) were isolated from the surface later of control soil (C), and definitely least-from the area of dumping sites W1 and W2. The waste accumulated in W1 and W2 led to the soil depletion in organic matter, inhibited the development of microorganisms and their enzymatic activity. The soil under landfill site W3 showed the highest values recorded for physicochemical properties, the count of Actinobacteria, as well as the activity of dehydrogenases and catalase. The concentration of heavy metals in soil under landfill site W3 was even tenfold higher than the values recorded at the other measurement points, which must have been due to the effect of the type of the waste dumped in landfill site W3, where biodegradable waste of organic origin dominated. Disturbing the biological control and unfavourable changes in the microbiocenotic composition were mostly revealed in soil at landfill site W1.

Activity of selected enzymes as markers of ecotoxicity in technogenic salinization soils

“…The enzymatic activity in soil is regulated by pH and the biomass of microorganisms (Dick et al 2000 ; Breza-Boruta et al 2016 ), correlated with the organic matter of soil (Bielińska et al 2013 ) and moisture content in soil. However, it varies in time and it is limited by substrate availability.…”

Microbiological contamination and content of heavy metals in unlined landfill sites of Ulaanbaatar

“…perfringens, the presence of Salmonella and total bacteria from landfills soil. In cover soil of landfill, the total bacteria count ranged from 0.1×10 6 CFU/g to 460×10 6 CFU/g while the total bacteria count ranged from 0.014×10 6 CFU/g to 0.3×10 6 CFU/g in control soil out of urban. The titre of E. coli, the titre of Proteus, the titre of Cl.…”

“…As a result, it causes a decrease in their count and enzymatic activity, which disturbs the soil environment homeostasis. 6 Uncollected solid waste also increases risk of injury, and infection. In particular, organic domestic waste poses a serious threat, since they ferment, creating conditions favourable to the survival and growth of microbial pathogens.…”

Screening and selection of autochthonous fungi from leachate contaminated-soil for bioremediation of different types of leachate

“…This could be related to the inhibitory effect of ammonia (3,112.7 -5,931.3 mg/L) on fungal growth and enzyme secretion by fungi in landfill [56]. In general, the presence of leachate contamination significantly impacted the composition of the microbial community and their diversity in leachate-contaminated soil [66]. This finding suggests that the enriched fungal isolates may be used in landfill leachate as a sole source of carbon and energy under oligotrophic conditions of ammonia, salt concentration and high pH.…”