Micro-peat as a potential low-cost adsorbent material for COD and NH3-N removal

Micro-peat (M-P) was demonstrated in the present study as a potential low cost natural adsorbent for the removal of COD and ammoniacal nitrogen (NH3-N) from landfill leachate. A series of batch experiments were carried out under fixed conditions and the influence of mixture ratio was investigated. The characteristics of leachate were then determined. Results indicated that leachate is non-biodegradable with high concentration of COD (2739.06 mg/L), NH3-N (1765.34 mg/L) and BOD5/COD ratio (0.09). The optimum ratio for activated carbon (AC) and M-P in the removal of COD and NH3-N obtained were at 2.5:1.5 (87%) and 1.0:3.0 (65%) respectively. The low-cost natural adsorbent used in the present investigation is an attractive alternative to the conventional adsorbent (AC). Thus, M-P can be appropriated for use in leachate treatment that could be cost-effective due its local availability and adsorption property

The effect of silane treatment on nanosized carica papaya seed modified pullulan as biocoagulant in wastewater treatment

Currently, conventional wastewater treatment process used chemical coagulant such as Aluminium sulphate. However, the residual aluminium in treated wastewater causes toxicity and serious health issues such as Alzheimer’ disease. Thus, in this study the potential of nanosized Carica Papaya (CP) seeds treated by silane coupling agent incorporated to pullulan on wastewater treatment was investigated. The biocoagulant produce prepared at a different composition of CP range from 1% to 9% was used to treat sewage wastewater. The biocoagulant was characterized by particle size analyser, FTIR and FESEM. The treated wastewater was analyzed by jar test in term of turbidity, pH, dissolved oxygen and Total Suspended Solid with biocoagulant dosage at 0.6 g/L. The size of nanosized biocoagulant was obtained at 608.9 nm. Silane treatment provides well dispersion of nanosized Carica Papaya seed powder in the pullulan matrix phase. FTIR analysis shows the presence of O-H, C=O and Si-O-CH3 bond. The highest turbidity reduction observed at the composition of nanosized CP5/P and silane treated nanosized CP5/P up to 93.89% and 93.98% respectively. However, no significant changes observed on turbidity reduction with increasing CP seeds content for both biocoagulant. Further, at these compositions, the TSS reduced up to 20% and 60% respectively. The DO value of wastewater decreased from the initial value and the increased the pH from 6.58 to 6.69 lead to the neutral condition. Therefore, the effectiveness of both untreated and silane treated biocoagulant were further confirmed upon textile wastewater with turbidity reduction achieved up to 7.84% and 14.54 % respectively. Overall, silane treatment enhanced the effectiveness of nanosized CP modified pullulan as biocoagulant

Landfill aeration for emission control before and during landfill mining

The landfill of Modena, in northern Italy, is now crossed by the new high velocity railway line connecting Milan and Bologna. Waste was completely removed from a part of the landfill and a trench for the train line was built. With the aim of facilitating excavation and further disposal of the material extracted, suitable measures were defined. In order to prevent undesired emissions into the excavation area, the aerobic in situ stabilisation by means of the Airflow technology took place before and during the Landfill Mining. Specific project features involved the pneumatic leachate extraction from the aeration wells (to keep the leachate table low inside the landfill and increase the volume of waste available for air migration) and the controlled moisture addition into a limited zone, for a preliminary evaluation of the effects on process enhancement. Waste and leachate were periodically sampled in the landfill during the aeration before the excavation, for quality assessment over time; the evolution of biogas composition in the landfill body and in the extraction system for different plant set-ups during the project was monitored, with specific focus on uncontrolled migration into the excavation area. Waste biological stability significantly increased during the aeration (waste respiration index dropped to 33% of the initial value after six months). Leachate head decreased from 4 to 1.5m; leachate recirculation tests proved the beneficial effects of moisture addition on temperature control, without hampering waste aerobization. Proper management of the aeration plant enabled the minimization of uncontrolled biogas emissions into the excavation area

Ethnic and religious tolerance: barrier factors and improvement measures based on Malay youth perspectives in Malaysia

Ethnic and religious unity is a thing that every country wishes for not exempting Malaysia. Tolerance among the population is very much expected to achieve this. Nevertheless, ethnic and religious diversity in Malaysia is often seen as a challenge for realizing tolerance and thus creating unity. Therefore, this paper aims to analyze the barrier factors for ethnic and religious tolerance while at the same time identifying proposals for improvement measures to tolerance among the community. Hence, the Focus Group Discussion or FGD study design was used by involving 20 Malay youth informants as information providers. As a result of the analysis it can be concluded that there are six themes that exist as a barrier factor to ethnic and religious tolerance, namely (i) social gap; 38.06 percent, (ii) political debate; 16.42 percent, (iii) religious differences; 16.42 percent, (iv) economic inequality; 11.94 percent, (v) rights and constitution; 11.94 percent, and (vi) primordial sentiment; 5.22 percent. Meanwhile, in addressing the problem of ethnic and religious tolerance, the informants also proposed four perspectives on improvement measures i.e. (i) social empowerment; 71.19 percent, (ii) political role; 15.25 percent, (iii) the rule of law; 10.17 percent, and (iv) maintaining the image of Islam; 3.39 percent. The issues are important to be scrutinized because the practice of good ethnic and religious tolerance can unite the community, thereby driving the stability and progress of the country

Landfill leachate treatment by combination of electro - fenton and sequencing batch reactor method

Landfill leachate contains a large amount of organic, inorganic and heavy metal contents. Untreated leachate is a potential source to effect of soil, surface and groundwater. The combined treatment offers an alternative technique in dealing to leachate treatment. This research is to determine the effectiveness of combined electro-Fenton and sequencing batch reactor (SBR) method on the removal of SS, colour, COD and NH3-N. The experimental involved three major parts were coagulation-flocculation, electro-Fenton and SBR method. This process could be operated independently in a batch mode and optimum conditions for each treatment were identified. In the combined process, leachate was first fed to coagulation-flocculation for pre-treatment. Then, the effluent from that process was oxidized in electro-Fenton process. The final process is the effluent of leachate was fed to a SBR method. The combined treatment was operated under the optimum conditions for all the processes. The result of coagulation-flocculation shown PAC is more effective at 2500 mg/L of optimum dosage. After coagulation-flocculation process, the removal of SS, colour, COD and NH3-N were 80%, 77%, 61% and 35% respectively. The result of electro-Fenton shown Al-Al is more effective at 200 A/m2 of optimum current density, 25 minutes of optimum reaction time, 4 of optimum pH, 800 mg/L of optimum H2O2 dosage and 1000 mg/L of optimum FeSO4•7H2O dosage. After electro-Fenton process, the removal of SS, colour, COD and NH3-N were 87%, 95%, 82% and 65% respectively. The final process of SBR effluent was approaching neutral pH at 6.90 at 2800 mg/L of optimum MLSS and 6 h of optimum reaction time. The overall performance of combined treatment on the removal of SS, colour, COD and NH3-N were 84%, 82%, 87% and 78% respectively. Thus, this combined treatment offers as an alternative technique for landfill leachate treatment on the removal of pollutants

Perencanaan Detail Engineering Design (DED) Instalasi Pengolahan Lindi (IPL) TPA Regional Kota Surakarta, Kabupaten Sukoharjo, dan Kabupaten Karanganyar

Abstrak TPA di Kota Surakarta, Kabupaten Sukoharjo, dan Kabupaten Karanganyar diperkirakan sudah hampir mencapai batas umur dan masih dioperasikan secara open dumping. Perencanaan pembangunan TPA Regional dengan sistem sanitary landfill dan disertai instalasi pengolahan lindi merupakan salah satu cara untuk menggantikan peran TPA sebelumnya. Dengan adanya pembangunan instalasi pengolahan lindi, air lindi dapat diolah terlebih dahulu sehingga tidak mencemari lingkungan sekitar. Untuk membangun instalasi pengolahan lindi memerlukan beberapa tahap, antara lain: 1) Menentukan debit lindi untuk mengetahui volume lindi dari pengolahan yang dibutuhkan. 2) Menentukan alternatif terpilih dari unit pengolahan lindi. 3) Mendesain dan membangun pengolahan lindi serta perhitungan biaya (RAB). Unit pengolahan lindi harus dapat menghasilkan karakteristik lindi yang memenuhi baku mutu berdasarkan Peraturan Kementerian Pekerjaan Umum No. 3 Tahun 2013. Hasil perencanaan debit lindi menunjukkan bahwa debit sebesar 45 m3/hari. Instalasi pengolahan lindi terdiri dari kolam anaerobik, aerated lagoons, kolam sedimentasi, dan wetland. Anggaran untuk membangun instalasi pengolahan lindi sebesar Rp 2.391.275.193,00. Kata kunci: lindi, karakteristik lindi, unit pengolahan lindi   Abstract Landfill in Surakarta, Sukoharjo, and Karanganyar regencies are estimated to have reached the age limit and are still operated in open dumping. Planning of Regional Landfill Development with sanitary landfill system and accompanied by leachate processing installation is one way to replace the previous landfill role. With the construction of leachate treatment plant, leachate water can be processed first so as not to pollute the surrounding environment. To build leachate processing installation requires several stages, the steps are: 1) Determine the leachate discharge to determine leachate volume of the required processing. 2) Determine the selected alternative from the leachate treatment unit. 3) Design and build leachate processing and cost calculation. Leachate processing unit should be able to produce leachate characteristics that meet the quality standard based on Peraturan Kementerian Pekerjaan Umum No. 3 Year 2013. The leachate discharge planning results show that the discharge is 45 m3/day. Leachate treatment plant consists of anaerobic pond, aerated lagoons, sedimentation pond, and wetland. Budget to build leachate treatment plant is Rp 2,391,275,193.00. Keywords: leachate, the caracteristics of leachate, leachate treatment uni

Treatment of dairy wastes with a microbial anode formed from garden compost

Garden compost has already been identified as a source of efficient electro-active (EA) biofilms. The work described here consisted of lixiviating the compost and then using the leachate as a microbial source. This procedure gave promising results for the treatment of yogurt waste (YW) in a microbial fuel cell (MFC). Experiments performed in MFC set-ups were compared with electrochemical cells under polarization at +0.1 V versus SCE. Different parameters were tested to optimize the microbial anode. Preliminary acclimation of the compost microbial flora to YW was revealed to be unnecessary. Forming biofilms firstly in pure leachate before exposing them to YW showed that high concentrations of this type of substrate were detrimental to current generation. Pre-treatment of the electrode by pre-adsorbing YW led to a 10-fold increase in the current density. The highest current densities were obtained at 40 and 60 °C, revealing the diversity of electro-active microorganisms coming from soils. Values up to 1,450 mA m−2 were reached at 40 °C

Public health and landfill sites

Landfill management is a complex discipline, requiring very high levels of organisation, and considerable investment. Until the early 1990’s most Irish landfill sites were not managed to modern standards. Illegal landfill sites are, of course, usually not managed at all. Landfills are very active. The traditional idea of ‘put it in the ground and forget about it’ is entirely misleading. There is a lot of chemical and biological activity underground. This produces complex changes in the chemistry of the landfill, and of the emissions from the site. The main emissions of concern are landfill gases and contaminated water (which is known as leachate). Both of these emissions have complex and changing chemical compositions, and both depend critically on what has been put into the landfill. The gases spread mainly through the atmosphere, but also through the soil, while the leachate (the water) spreads through surface waters and the local groundwater. Essentially all unmanaged landfills will discharge large volumes of leachate into the local groundwater. In sites where the waste accepted has been properly regulated, and where no hazardous wastes are present, there is a lot known about the likely composition of this leachate and there is some knowledge of its likely biological and health effects. This is not the case for poorly regulated sites, where the composition of the waste accepted is unknown. It is possible to monitor the emissions from landfills, and to reduce some of the adverse health and environmental effects of these. These emissions, and hence the possible health effects, depend greatly on the content of the landfill, and on the details of the local geology and landscape. There is insufficient evidence to demonstrate a clear link between cancers and exposure to landfill, however, it is noted that there may be an association with adverse birth outcomes such as low birth weight and birth defects. It should be noted, however, that modern landfills, run in strict accordance with standard operation procedures, would have much less impact on the health of residents living in proximity to the site