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Characteristics of Organic Matter Released from Water Treatment Sludge in Water Treatment Facilities Anggreini, Sri; Saputra, Ade Jaya; LQ Parulian Sanjaya S
Journal of Civil Engineering and Planning (JCEP) Vol. 6 No. 1 (2025)
Publisher : Program Studi Sarjana Teknik Sipil Universitas Internasional Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37253/jcep.v6i1.10441

Water treatment sludge (WTS) generated from water treatment plants (WTPs) contains organic matter (OM) that may be released during storage prior to the dewatering process due to the influence of temperature and oxygen. The release of OM from WTS can deteriorate the quality of treated water if the dewatering effluent is recycled back into the WTP system. This study aims to investigate changes in the quality of OM in WTS during storage under varying temperatures (20°C and 40°C) and oxygen conditions (oxic and anoxic). The characteristics of released OM were evaluated by measuring dissolved organic carbon (DOC), ultraviolet absorbance at 260 nm (UV260), and fluorescence Excitation-Emission Matrix (EEM). The Specific UV Absorbance (SUVA) parameter was also calculated to assess the aromatic content of OM. The highest DOC concentration (4.94 mg/L) was observed under anoxic conditions at 40°C, which was 4.3 times higher than the lowest value found under oxic conditions at 20°C (1.14 mg/L). The highest UV260 absorbance (13.55 m⁻¹) and SUVA value (2.74 m⁻¹/(mg/L)) were also found under the anoxic 40°C condition, indicating a dominance of aromatic and humic-like substances formed during storage. EEM fluorescence analysis detected three main peaks representing protein-like, fulvic acid-like, and humic acid-like substances. Fulvic and humic acid-like substances were released more abundantly under anoxic conditions compared to protein-like substances. Differences in oxygen and temperature conditions play a significant role in determining the characteristics of OM released from WTS.

Production Precipitated Calcium Carbonate (PCC) using Continuous Stirred Bubble Reactor (CSBR) Sari, Ellyta; Arief, Syukri; Zulhadjri, Zulhadjri; Desmiarti, Reni; Amir, Amelia; Ramadhani, Umi; Agtata, Shazvelia Dwi; Anggreini, Sri
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 3 (2023): December 2023 [Available online since December 26, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i3.27356

Precipitated calcium carbonate (CaCO3) has advantages such as small white and fine particle size, high homogeneity, and uniformity of particle shape so it is a product that is much sought after by various types of industry. PCC synthesis must be accompanied by the use of an efficient type of reactor for the reaction. PCC can be synthesized via a carbonation method that utilizes CO2 gas. This research aims to optimize all processes that occur in the PCC production circuit using a CSBR reactor in the form of a tank reactor to optimize the PCC synthesis process from the previous reactor and accommodate the number of tools to be economical. This research aims to optimize all processes that occur in the PCC production circuit using a CSBR reactor in the form of a tank reactor to optimize the PCC synthesis process from the previous reactor and accommodate the number of tools to be economical. Based on the research results, the PCC synthesis process is influenced by the type of solvent, temperature, CO2 gas flow rate, reaction time, and reactor type. The performance of the CSBR reactor was carried out using variations of R1, R2, R3, and R4 using the carbonation method, resulting in the highest purity and yield of 94.6% and 92.08%.

ROLES OF ENVIRONMENTAL CONDITIONS AND ULTRASONICATION IN RELEASING ORGANIC MATTER FROM BIOLOGICAL ACTIVATED CARBON Anggreini, Sri; Saputra, Ade Jaya; Sanjaya S, LQ Parulian
Jurnal Teknik Sipil dan Arsitektur Vol 31 No 1 (2026): Jurnal Teknik Sipil dan Arsitektur
Publisher : Fakultas Teknik Universitas Tunas Pembangunan Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36728/jtsa.v31i1.5899

Biological activated carbon (BAC) is widely used in drinking water treatment because it combines adsorption on activated carbon with biodegradation carried out by the attached microbial community. However, environmental shifts such as changes in pH, temperature, or physical disturbances may cause previously adsorbed organic matter (OM) to detach from the activated carbon. This phenomenon can increase dissolved organic carbon in treated water and potentially affect downstream processes. This study examined how pH, temperature, and ultrasonication influence the release of OM from BAC. The BAC was extracted using DOC-free tap water under different pH conditions (5.8, 7.0, and 8.6) and temperatures (5°C, 20°C, and 30°C), with and without the application of ultrasonication. After treatment, dissolved organic carbon (DOC) and UV absorbance at 260 nm (UV260) were measured to characterize the released OM. The results show that higher pH promotes OM detachment, with both DOC and UV??? values increasing markedly under alkaline conditions. Temperature also played a strong role; warmer conditions enhanced OM release, indicating that higher kinetic energy and increased molecular mobility facilitate detachment. Ultrasonication consistently intensified the release across all conditions, suggesting that the disruption of biofilms and the reopening of blocked pores contribute to this effect. The findings highlight the sensitivity of BAC to operational changes and underscore the importance of monitoring OM release to maintain the reliability of drinking water treatment systems.

ROLES OF ENVIRONMENTAL CONDITIONS AND ULTRASONICATION IN RELEASING ORGANIC MATTER FROM BIOLOGICAL ACTIVATED CARBON Anggreini, Sri; Saputra, Ade Jaya; Sanjaya S, LQ Parulian
Jurnal Teknik Sipil dan Arsitektur Vol 31 No 1 (2026): Jurnal Teknik Sipil dan Arsitektur
Publisher : Fakultas Teknik Universitas Tunas Pembangunan Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36728/jtsa.v31i1.5899

Biological activated carbon (BAC) is widely used in drinking water treatment because it combines adsorption on activated carbon with biodegradation carried out by the attached microbial community. However, environmental shifts such as changes in pH, temperature, or physical disturbances may cause previously adsorbed organic matter (OM) to detach from the activated carbon. This phenomenon can increase dissolved organic carbon in treated water and potentially affect downstream processes. This study examined how pH, temperature, and ultrasonication influence the release of OM from BAC. The BAC was extracted using DOC-free tap water under different pH conditions (5.8, 7.0, and 8.6) and temperatures (5°C, 20°C, and 30°C), with and without the application of ultrasonication. After treatment, dissolved organic carbon (DOC) and UV absorbance at 260 nm (UV260) were measured to characterize the released OM. The results show that higher pH promotes OM detachment, with both DOC and UV??? values increasing markedly under alkaline conditions. Temperature also played a strong role; warmer conditions enhanced OM release, indicating that higher kinetic energy and increased molecular mobility facilitate detachment. Ultrasonication consistently intensified the release across all conditions, suggesting that the disruption of biofilms and the reopening of blocked pores contribute to this effect. The findings highlight the sensitivity of BAC to operational changes and underscore the importance of monitoring OM release to maintain the reliability of drinking water treatment systems.

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