Papers by Keyword: Leachate

Abstract: Landfill Leachates is one of the pollutants containing high organic matter and heavy metal which can cause toxic pollution to water due to less than optimal leachate processing. This study aims to introduce fine bubbles treatment to the leachate processing technology at the waste treatment facility at Sarimukti, West Java Indonesia. The toxicity test was conducted in the acute toxicity test and test for D. magna. The acute toxicity test was carried out using a static biological test according to APHA standards (1995). The LC₅₀-48 hours ware calculates using the Finney Probit Analysis Software. The results showed that the effectiveness of Sarimukti TPA leachate treatment was 97.5% DO, 71% BOD, 86% TDS, and 74.8% turbidity. The XRF spectra on the leachate after fine bubble found a recovery of heavy metal elements such as Cr, Mn, Fe, Zn, Cu, Pb, As, and Sn. Based on the Minister of Environment and Forestry Regulation, the effectiveness of leachate processing has reached the safe standard limit for pH, mercury, cadmium parameters. The acute toxicity of leachate before and after treatment fine bubble was 14.516 ppm and 11.178 ppm. The acute toxicity of leachate is considered almost non-toxic.

Abstract: The leachate from landfills is considered as a great danger to the environment and human health. This danger is represented in its toxic components. The major purpose of this project is how to get rid of the toxic materials by a collection of sediments, scrap rubber and geotextile layers. Ten (10) cells with different compositions were used in this process, and the physicochemical analysis were made on water resulted from filtration. And permeability test on all cells. The results show that the physicochemical factors reduce with the increase of thickness of sediment layer. The physicochemical factors of water resulted from the cells which contain scrap rubber with dimensions of 0.2mm are fewer than the ones with dimensions of 4mm. The permeability factor rise in all the cells with the increase of scrap rubber layer thickness of both types.Cell 5 with no scrap rubber gave better results in physicochemical factors but weak results in permeability factor. Cell 4 gave good results in both physicochemical and permeability factors

Abstract: This article discusses the organization and the results of the laboratory-scale experiments in bioreactors with samples of municipal solid waste (MSW) for assessment of biogas potential and leachate emissions for MSW landfills energy reclamation with the aim of sustainable urban development. The procedure of organization and carrying out laboratory experiments on MSW decomposition in bioreactors providing similarity to MSW landfill conditions was approved using equipment meeting the international requirements.

Abstract: The reuse of sludge in clay brick material is a long-term approach to sludge disposal for economic and environmental sustainability. In this study, steel mill sludge collected from Kluang, Johor was used to be investigated to replace clay as brick material. The raw material has been characterized using X Ray Fluorescent (XRF) analysis. The optimum moisture content (OMC) and maximum dry density (MDD) of the soil used was performed by using Standard Proctor Compaction Test in order to verify percentages of water used during brick manufacturing. Brick were manufactured into different percentages which are control brick (0%) and steel mill sludge brick with 5%, 10% and 15% of steel mill sludge waste. Manufactured brick was dried and fired in a furnace at 1050 °C. The results showed that zinc (Zn) and copper (Cu) are the higher heavy metal concentrations detected in steel mill sludge. Meanwhile, leachability test showed that heavy metals leached from steel mill sludge brick are low under permissible limit and complied with United States Environmental Protection Agency (USEPA).

Abstract: In this study, the performance of a semi-aerobic landfill was monitored through the analysis of leachate composition collected from different leachate ponds; collection pump (CP), equalization pond (EQ) and aerated pond (AP). The landfill site is located in the tropical environment of the central region of Malaysia. Twenty parameters were analyzed and the average values of the parameters for leachate at the CP, EQ and AP, which include; pH (8.24, 8.00 and 8.73), total kjeldahl nitrogen (3987.25, 8744.6, 1927.31 TKN-N), ammonia-N (3726, 3800, 1560 mg/L NH₃-N), nitrate (26.7, 33.3, 25 mg/L NO₃-N), total phosphorus (0.85, 0.78, 0.92 mg/L PO₄^3-), BOD₅ (305, 311.3, 201 mg/L), COD (16100, 14587, 12780 mg/L), BOD₅/COD (0.019, 0.021, 0.016), turbidity (405, 735, 940 NTU), colour (3991, 4122, 3412 Pt Co), TSS (109.3, 58, 50.7 mg/L), EC (32.8, 21.9, 37.0 mS/cm) and TDS (21.98, 14.7, 24.8 mg/L) were recorded appropriately. The results realized from the analysis of the three ponds, were compared with previously published data and also the standards specified by the Malaysia Environmental Quality Act 1974. The obtained results indicate that the leachate from the aerated pond could remove some of the pollutants and was more stabilized when compared with the leachate from the pump and equalization ponds. It is also found that the aeration process in aerated pond could enhance the reduction of pollutants in the leachate. The measured leachates would require appropriate treatment methods in order to reduce the pollutants to meet the discharge standard before releasing them into water courses.

Abstract: Landfill still remains the most commonly employed treatment for municipal solid waste disposal around the world, which generates a high-strength wastewater with complex constituents referred to as landfill leachate. As consequences, if not properly treated and safely disposed, leachate can migrate into soil and subsoils which might cause severe damage to eco-system of land, surface water and groundwater. Aim of this paper is to establish the optimum parameters of starch-based coagulant as an alternative coagulant to remove suspended solid (SS), colour, turbidity, carbon oxygen demand (COD), and ammoniacal-nitrogen in leachate treatment by using RSM method. Leachate was collected from Matang Landfill Site, Perak, Malaysia. In this paper, the efficiency of Jackfruit seeds starch (JSS) act as a coagulant aid is established by using Kategunya method with percentage yield of 33.67%. The starch obtained is then used together with polyaluminium chloride (PAC) in leachate sample. The removal efficiency was determined by a series of experiments using jar test. By using three independent variables including pH, dosage of PAC and dosage of JSS for Central Composite Design (CCD) of RSM, optimum removal of response parameters is carried out. As a result, optimum removal of COD at pH 5, 523.32 mg/L of PAC, 400 mg/L of JSS gives Prob.>F significantly with only 4.32% error. The results showed that, addition of JSS as coagulant aid also helps to reduce the dosage of PAC as well as JSS in leachate. As a conclusion, JSS can be used as a coagulant aid to PAC.

Abstract: Sanitary landfill is the most common way to eliminate solid waste. However, sanitary landfill generates large quantity of leachate. Leachate can be defined as a liquid that passes through a landfill and extracted dissolved and suspended matter. The presence of large quantity of contaminants in leachate is harmful to human and ecological environment. This can lead to health issues, including gastrointestinal illness, reproductive problems, and neurological disorders. There are several significant techniques have been made to overcome the problem of leachate pollution, including photocatalytic oxidation, adsorption/separation processing and bioremediation. However, the applications have been restricted by many factors, such as processing efficiency, operational method, energy requirements, and economic benefit. This present article provides an overview of research studies and advances concerned with the development of nanoparticles and their potential applications in leachate treatment. Nanoparticles can act as antimicrobial and function as reducing agent and catalyst in detoxification of pollutants in the environment, such as organic, inorganic and heavy metals. NPs have been suggested as efficient, cost-effective and environmental friendly alternative to existing treatment materials and presents a number of potential environmental benefits.

Abstract: This study compared the floc and sludge formed during the coagulation of leachate by different types of coagulants. The coagulants tested in this study were Ferric chloride (FC), pre-hydrolyzed iron (PHI), dual coagulant (PHI+TF(tapioca flour)), and composite coagulant (pre mix of PHI and TF (PHITF)). The floc and sludge were characterized by measuring the sludge volume index (SVI), sludge velocity (SV), and floc size. Results showed that the hierarchy for SVI, SV, and floc size were FC>PHI>PHI+TF>PHITF, PHITF>PHI+TF>PHI>FC, and PHI+TF>PHITF>PHI>FC, respectively. PHITF demonstrated the lowest SVI and the shortest sludge settling time among the tested coagulants. PHI+TF produced the largest floc size. The addition of TF in PHI as a composite and dual coagulant significantly improved the floc and sludge characteristics. PHITF improved the floc and sludge formation of partially stabilized leachate.This study compared the floc and sludge formed during the coagulation of leachate by different types of coagulants. The coagulants tested in this study were Ferric chloride (FC), pre-hydrolyzed iron (PHI), dual coagulant (PHI+TF(tapioca flour)), and composite coagulant (pre mix of PHI and TF (PHITF)). The floc and sludge were characterized by measuring the sludge volume index (SVI), sludge velocity (SV), and floc size. Results showed that the hierarchy for SVI, SV, and floc size were FC>PHI>PHI+TF>PHITF, PHITF>PHI+TF>PHI>FC, and PHI+TF>PHITF>PHI>FC, respectively. PHITF demonstrated the lowest SVI and the shortest sludge settling time among the tested coagulants. PHI+TF produced the largest floc size. The addition of TF in PHI as a composite and dual coagulant significantly improved the floc and sludge characteristics. PHITF improved the floc and sludge formation of partially stabilized leachate.

Abstract: In order to determine the optimum air injection craftwork for the aerobic-anaerobic landfill method, three pilot-scale lysimeters were constructed. Through experiment in the lysimeters, it was concluded that air injection at bottom layer (in this research it’s 2.5 m) is the optimum position in terms of improving on the solid organic matters stabilization, amelioration on leachate quality, the restraint of GHE (Green House Effect) by CH₄. For instance, air injected at bottom layer may get more TOC minimization in leachate under lower temperature (-4-10°C) and high temperature (20-35°C) compared with other conditions. NH₄⁺-N content expressed similar advantages with air injected at bottom layer case. Meanwhile, accompanied with the high dissolved oxygen (DO) and higher TOC consumption in leachate, aerobic fermentation was activated in this case, and most organic carbon was transformed in term of CO₂, in which the goal of restraint on GHE was realized. On basis of mechanism assumption, mathematical model was developed and according to the simulated results for 5 years, air injected at 2.5 m achieved improvements on stabilization of solid phase organic carbon and nitrogen for 34 % and 13 %, amelioration on leachate quality for 35 % and 62 % of TOC and T-N, and the restraint of GHE for 14 times compared with no air injection case.

Abstract: Contrast experiment was developed on the semi-aerobic and anaerobic landfill treatment. Leachate nitrate nitrogen concentrations in different landfill layers spatially were monitored regularly in two landfill equipments, and variations and differences of leachate nitrate nitrogen concentration of different landfills were discussed. The results showed that differences on the variation characteristics of nitrate nitrogen concentration in space and time were obvious in the landfill treatments with different structures. In 73 weeks of monitoring period, nitrate nitrogen concentration in the middle and the lower layer of semi-aerobic landfill treatment was in turn stable within 55.40 mg/L and 40.80 mg/L; The concentration fluctuations in both layers were small in general. Nitrate nitrogen concentration decreased respectively to 9.26 mg/L, 6.82 mg/L and 4.69 mg/L at the 73th week from 28.51 mg/L, 4.44 mg/L and 5.85 mg/L at the initial landfill stage in the lower , middle and the upper layer of anaerobic landfill treatment. When degradation of the landfill treatments went into relatively stable stage, nitrate nitrogen concentration in the upper, middle and the lower layer of semi-aerobic landfill treatment was located respectively in 30-240 mg/L, 2.5-11.0 mg/L and 5.5-13.5 mg/L respectively, and the spatial distribution difference of nitrate nitrogen concentration in the upper layer of semi-aerobic landfill treatment was relatively big, but those of the middle and the lower layer were relatively small, and they were both lower than the upper layer. Nitrate nitrogen concentration in the upper, middle and the lower layer of anaerobic landfill treatment was located in 1.6-7.4 mg/L, 3.8-7.2 mg/L and 7.5-15 mg/L respectively, and showing a performance of spatial nitrate nitrogen concentration that was the lower layer> the middle layer >the upper layer. Under the experimental conditions, seim-aerobic landfill treatment was favorable to the nitrification and denitrification of leachate in contrast with the anaerobic landfill treatment.