chemical oxygen demand
Recently Published Documents


TOTAL DOCUMENTS

1270
(FIVE YEARS 384)

H-INDEX

44
(FIVE YEARS 8)

2022 ◽  
pp. 130379
Author(s):  
Tunmise Ayode Otitoju ◽  
Yuanyuan Ouyang ◽  
Dafu Jiang ◽  
Noor Fazliani Shoparwe ◽  
Johannes Carolus Jansen ◽  
...  

WARTA AKAB ◽  
2021 ◽  
Vol 45 (2) ◽  
Author(s):  
Ahmad Zakaria ◽  
Sopian Sauri ◽  
Dian Mira Fadela ◽  
Puspita Sri Ayu Wardhani

Industri pangan menghasilkan air limbah berbahan organik dan padatan tersuspensi maupun terlarut yang tinggi. Salah satu proses pengolahan air limbah yaitu dengan proses koagulasi-flokulasi yang bertujuan untuk menghilangkan padatan tersuspensi dan zat organik yang dapat menyebabkan kekeruhan serta bau dengan penambahan koagulan. Penambahan koagulan pada instalasi pengolahan air limbah (IPAL) tidak dilakukan secara kuantitatif, sehingga perlu dilakukan percobaan dengan metode jar test. Tujuan percobaan untuk mengetahui pH dan dosis optimum serta efisiensi koagulan poly aluminium chloride (PAC) untuk menurunkan kadar chemical oxygen demand (COD), total suspended solid (TSS), dan total dissolved solid (TDS). Hasil uji parameter COD, TSS, dan TDS dibandingkan dengan Surat Keputusan Gubernur Tingkat 1 Jawa Barat (SK Gub TK 1 Jabar) No. 6 Tahun 1999 tentang Baku Mutu Limbah Cair Bagi Kegiatan Industri di Jawa Barat. Berdasarkan hasil percobaan diperoleh kondisi optimum koagulan PAC pada pH air limbah 6–7 dengan dosis koagulan optimum pada (80–90) mg/L. Hasil pengujian parameter TS, TDS, TSS, kekeruhan dan COD berturut-turut memberikan nilai efisiensi sebesar (52,6-57,8)%, (53,9-55,5)%, (52,4-58,1)%, (97,8-99,1)%, dan (71,6–77,1)%. Percobaan yang dilakukan membuktikan bahwa koagulan PAC mampu menurunkan kadar pada parameter uji dengan nilai efisiensi yang cukup besar.


Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3629
Author(s):  
Yuquan Zhao ◽  
Jian Shen ◽  
Jimeng Feng ◽  
Zhitong Sun ◽  
Tianyang Sun ◽  
...  

Water quality estimation tools based on real-time monitoring are essential for the effective management of organic pollution in watersheds. This study aims to monitor changes in the levels of chemical oxygen demand (COD, CODMn) and dissolved organic matter (DOM) in Erhai Lake Basin, exploring their relationships and the ability of DOM to estimate COD and CODMn. Excitation emission matrix–parallel factor analysis (EEM–PARAFAC) of DOM identified protein-like component (C1) and humic-like components (C2, C3, C4). Combined with random forest (RF), maximum fluorescence intensity (Fmax) values of components were selected as estimation parameters to establish models. Results proved that the COD of rivers was more sensitive to the reduction in C1 and C2, while CODMn was more sensitive to C4. The DOM of Erhai Lake thrived by internal sources, and the relationship between COD, CODMn, and DOM of Erhai Lake was more complicated than rivers (inflow rivers of Erhai Lake). Models for rivers achieved good estimations, and by adding dissolved oxygen and water temperature, the estimation ability of COD models for Erhai Lake was significantly improved. This study demonstrates that DOM-based machine learning can be used as an alternative tool for real-time monitoring of organic pollution and deepening the understanding of the relationship between COD, CODMn, and DOM, and provide a scientific basis for water quality management.


Author(s):  
Elin Marlina ◽  
Purwanto Purwanto ◽  
Sudarno Sudarno

In this study, decolorization of wastewater samples taken from the paper industry is investigated using electrochemical peroxidation process. The electrochemical peroxidation process is a part of electrochemical advanced oxidation processes, which is based on the Fenton’s chemical reaction, provided by addition of external H2O2 into reaction cell. In this study, iron is used as anode and graphite as cathode put at the fixed distance of 30 mm in a glass reaction cell. The cell was filled with the solution containing wastewater and sodium chloride as the supporting electrolyte. Factors of the process such as pH, current intensity, hydrogen peroxide concentration, and time of treatment were studied. The results illustrate that all these parameters affect efficiencies of dye removal and chemical oxygen demand (COD) reducing. The maximal removal of wastewater contaminants was achieved under acid (pH 3) condition, with the applied current of 1 A, and hydrogen peroxide concentration of 0.033 M. At these conditions, decolorization process efficiency reached 100 and 83 % of COD removal after 40 minutes of wastewater sample treatment. In addition, the electrical energy consumption for wastewater treatment by electrochemical peroxidation is calculated, showing increase as the current intensity of treatment process was increased. The obtained results suggest that electrochemical peroxidation process can be used for removing dye compounds and chemical oxygen demand (COD) from industrial wastewaters with high removal efficiency.


2021 ◽  
Vol 4 (2) ◽  
pp. 23-36
Author(s):  
Muhamad Aulia Aulia ◽  
Mahmud Mahmud ◽  
Badaruddin Mu'min

Limbah kayu ulin di Kalimantan Selatan sangat banyak jumlahnya dan belum dimanfaatkan secara optimal. Kayu ulin berpotensi dimanfaatkan sebagai adsorben untuk menurunkan bahan organik. Kayu ulin dijadikan adsorben karena mempunyai sifat yang keras dengan material yang hanya mengandungxkarbon. Peningkatan luas permukaan adsorben arangxkayuxulin dapat dilakukan melalui aktivasi kimia. Metode yang digunakan dalam penelitian ini yakni aktivasi secara fisika menggunakan furnace. Berdasarkan hasil penelitian gambaran proses adsorpsi yang tepat pada model Isoterm adsorpsi COD terhadap karbon aktif kayu ulin berturut-turut adalah model Isoterm Freundlich dengan nilai R2 0,8898; Langmuir dengan nilai R2 0,9320; Redlich-Peterson dengan nilai R2 0,957; dan Temkin dengan nilai R2 0,8559, sedangkan pada penggambaran proses adsorpsi yang tepat dari model kinetika adsorpsi COD air sungai terhadap karbon aktif kayu ulin adalah model kinetika Pseudo orde dua. Berdasarkan hasil dari model isoterm dan kinetika mekanisme adsorpsi COD air sungai terjadi secara fisika dan kimia dengan didominasi oleh mekanisme secara kimia.


2021 ◽  
Vol 147 (12) ◽  
pp. 04021059
Author(s):  
Mohammad Issa ◽  
Thorben Muddemann ◽  
Dennis Haupt ◽  
Ulrich Kunz ◽  
Michael Sievers

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0260527
Author(s):  
Haibin Xiong ◽  
Li Chen ◽  
Zhaohua Sun ◽  
Zhiqing Li ◽  
Kun Zhou ◽  
...  

It is known that channel engineering, including the construction of piers, will change the river hydrodynamic characteristics, which is a significant factor affecting the transport process of pollutants. With this regard, this study uses the well-validated and tested hydrodynamic module and transport module of MIKE 21 to simulate the hydrodynamics and water quality under various pier densities in the Wuhan reach. Hydrodynamic changes around the piers show spatial differences, which are similar under different discharges. The range and amplitude of hydrodynamic spatial variations increase with the increase in pier density. However, there is a critical value of 1.25 to 2.5 units/km. When the pier density is less than this critical value, this type of cumulative effect is the most significant. Additionally, greater changes can be found in chemical oxygen demand concentrations, which also show spatial and temporal variations. The area with high chemical oxygen demand concentration upstream and downstream from the engineering area exhibits the distribution characteristics of “decrease in the downstream area and increase in the upstream area” and “increase in downstream the area and decrease in the upstream area” respectively. In the reach section of the engineering area, the area with high chemical oxygen demand concentration increases in the front area near the piers and decreases near the shoreline. Furthermore, the concentration shows attenuation actions with a longer residence time owing to the buffering effect of pier groups. These results have significant implications on shoreline planning and utilization. Moreover, they provide scientific guidelines for water management.


Sign in / Sign up

Export Citation Format

Share Document