Rawatan larut resapan menggunakan penjerap media komposit karbon teraktif, zeolit, batu kapur dan enapcemar sisa kertas

Kajian ini dijalankan bagi meneroka potensi WPS dan LS untuk menggantikan sebahagian AC dan ZEO dalam penghasilan media komposit baharu. Nisbah optimum AC-WPS (media hidrofobik) adalah 2:2, manakala ZEO-LS (media hidrofilik) adalah 25:15. Nisbah optimum 4:4 media hidrofobik-hidrofilik dipilih berdasarkan ciri-ciri penjerapan NH3-N dan COD, dan 30 % OPC telah digunakan sebagai bahan pengikat. Media komposit ZELPA telah dihasilkan dan pencirian sifat fizikal-kimia dilakukan. ZELPA digunakan dalam kajian isoterma penjerapan NH3-N, COD dan warna pada keadaan optimum pH 7, kelajuan goncangan 200 rpm, saiz partikel 1.18-2.36 mm dan masa sentuhan 120 minit. Setelah ujian kelompok dilaksanakan, ujikaji isoterma penjerapan dan kinetik penjerapan dilakukan. Kapasiti penjerapan untuk kesemua parameter (dalam mg/g) masing-masing 27.55, 48.08 dan 34.48. Kajian perbandingan menunjukkan keupayaan penjerapan ZELPA terhadap NH3-N dan COD adalah lebih baik daripada ZEO dan AC, dan setanding dengan AC bagi penjerapan warna. Kajian kinetik penjerapan mendapati ZELPA mengikuti hampir kesemua model yang dikaji iaitu pseudo tertib pertama dan kedua, Elovich dan pembauran intra-partikel. Kajian penjerapan turus dengan menggunakan model EBCT menunjukkan penyingkiran sebanyak 99 % untuk NH3-N dan 98 % untuk COD dan warna. Kapasiti bolos dan masa tepu didapati makin berkurangan dengan berlakunya peningkatan terhadap kadar aliran. Didapati data uji kaji lebih mematuhi Model Thomas dan Yoon-Nelson berbanding Adams-Bohart. ZELPA boleh digunakan semula selepas menjalani ujikaji regenerasi dengan larutan 0.5 M NaCl pada pH 11-12 (dilaras dengan 1 M NaOH). Dengan kapasiti penjerapan untuk NH3-N, COD dan warna (dalam mg/L) masing-masing 32.26, 38.76 dan 31.95. Gabungan media alternatif WPS dan LS menunjukkan impak positif dalam penjerapan larut resapan. Penggunaan WPS dalam teknologi penjerapan secara tidak langsung berupaya menangani masalah pelupusan sisa kertas yang tidak boleh dikitar semula

Utilization of waste paper sludge as an alternative adsorbent for the adsorption of ammonia nitrogen and COD in stabilized landfill leachate

Waste paper sludge (WPS) is produced by the paper industry during the wastewater treatment process of paper production. The disposal techniques of WPS pose a great concern for the environment. This study focuses on the evaluation of WPS as an alternative absorbent material to activated carbon (AC) for the removal of contaminants from stabilized landfill leachate. Ammonia nitrogen (NH3-N) and chemical oxygen demand (COD) were identified as the two major contaminants in landfill leachate. Both AC and WPS were mixed together in different ratios. The optimum replacement for the absorbent was determined using the batch technique. The adsorption batch study was carried out under the optimum pH of 7, with a shaking speed of 200 rpm and a contact time of 120 minutes. The adsorption isotherms indicated that the Langmuir model was better fitted to the experimental data as it was found to have the highest regression values. The Langmuir adsorption capacities for COD and NH3-N were 32.26 mg/g and 21.60 mg/g, respectively. The optimum replacements were initially at two different ratios of 2:2 and 3:1 based on the optimum removal of COD and NH3-N, respectively. However, the final optimum replacement for the absorbents (AC: WPS) in this study was the ratio of 2:2 due to the higher removal of COD (85.9%) and NH3-N (49.3%)

Removal of cod using delonix regia pods activated carbon adsorbent for natural rubber wastewater treatment

Leachate are very high strength wastewaters that contain a variety of pollutants that pose a serious threat to the environment if appropriate control measure is ignored. Composite adsorbent is an emerging, interesting and attractive alternative to conventional adsorbents and having the ability to act as catalysts due to their high reactivity and excellent selectivity towards specific pollutant compounds. This study investigated the potential of biocomposite adsorbent made from a combination of chitosan, feldspar and zeolite (CFZ) for the treatment of Iron (Fe) from leachate wastewater. Leachate characterization and batch adsorption experiments was conducted to determine the optimum conditions for pH, dosage and contact time parameter in the removal of Fe. The result shows that the concentration of Fe was 15.82 which exceeded the recommended limit. The optimum conditions also occurred at pH 5 with 6 gram of biocomposite dosage and at 180 minutes contact time. The corresponding removal efficiency for Fe is 90% with 0.0127 mg/g uptake capacity

The effectiveness of peat-AC composite adsorbent in removing color and Fe from landfill leachate

Adsorption is a commonly used method for the removal of such various pollutants from aqueous solutions. Nowadays, due to cost-effectiveness, the adsorbent should be economical and cheaply available in abundance and it should require minimal for discharge into water bodies. This study was undertaken to investigate the efficiency of activated carbon (AC) to partially replace with peat as an inexpensive adsorbate composite medium for removing color and iron (Fe) from landfill leachate. The process of identifying the optimum composition of the composite adsorbent was carried out using batch technique. It shaken for 2 hours with 200 rpm at pH 7. The optimum ratio of peat and AC had been chosen as 2.0:2.0 for color while 2.5:1.5 for Fe. The value of the removal percentage for color and Fe were 74.4% and 79.6% in respectively. This indicates that peat can be used as a cost-effective medium to partially substitute of commercially AC in the composite for color and iron removal at a considerably lower cost