Effect of recirculation ratio on the performance of modified septic tank in treating office building wastewater

Va, Vandith; Setiyawan, Ahmad Soleh; Soewondo, Prayatni; Putri, Dyah Wulandari

doi:10.1051/e3sconf/202014801001

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…Modified septic tanks (MSTs) are development of septic tank system to provide domestic wastewater treatment using additional mechanisms, such as anaerobic digestion and also disinfection [3]. In [4] a modified septic tank has been developed, where the septic tank consists of an anoxic compartment and aerobic moving bed film bioreactor (MBBR) in order to obtain better results of organic content and nutrients removal, but there has been no further research on removal related to microbial content, such as total coliform, fecal coliform, and E. coli in domestic wastewater.…”

Section: Introductionmentioning

confidence: 99%

Inactivation of Escherichia coli in domestic wastewater by modified septic tank treatment

Pangaribuan,

Setiyawan,

Putri

2024

E3S Web of Conf.

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The Sustainable Development Goals (SDGs) targets for the improvement of drinking water, sanitation, and hygiene (WASH) makes the development of wastewater infrastructure in many countries is increasing. In Indonesia, the development of sewer connections remained limited nationally, most households still rely on on-site sanitation systems that mainly use septic tanks technology. Septic tank as watertight containment itself cannot provide the treatment to comply with the effluent standard of domestic wastewater, while a lot of application of septic tank do not follow by suggested technology for further treatment. That makes the need of septic tank improvement as modified septic tank (MST) system. One of parameters removed by MST better is microbial content. This research aims to identify Escherichia coli inactivation in MST, how the process along the treatment impact E. coli concentration and identification the effectiveness of trichloroisocyanuric acid (TCCA) tablet application as disinfectant in E. coli inactivation, and concurrently safe to environment. This research was conducted in laboratory using MST reactor set-up consists of pre-sedimentation chamber, fixed bed anoxic chamber, and MBBR chamber to treat synthetic wastewater. The synthetic wastewater, composed by C6H12O6, NH4Cl, KH2PO4 and E. coli culture is used. With influent E. coli concentration was 108-109, it was reduced to 108 in pre sedimentation chamber, 106-107 in fixed bed anoxic chamber, 105-106 in MBBR chamber and final effluent, all in MPN/100 ml unit. E. coli was inactivated 99.84% along MST process but with relative high concentration to be discharged. Application of TCCA tablet 90% active chlorine with contact time 15 minutes is adequate to inactivate E. coli completely but generates high concentration of chlorine residual.

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Section: Introductionmentioning

confidence: 99%

Inactivation of Escherichia coli in domestic wastewater by modified septic tank treatment

Pangaribuan,

Setiyawan,

Putri

2024

E3S Web of Conf.

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Enhancement of SBR’s treatment under organic shock load

Ahmed,

ELKaramany,

Alged

2024

Preprint

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Organic shock loads often hinder biological wastewater treatment systems from meeting discharge standards, as a result, these systems frequently fail to achieve the required level of treatment so, the potential impact of these loads was investigated using laboratory-scale sequencing batch reactors (SBRs). Short-term (4.5 h) exposure to 721.25 - 1515.36 mg COD/L shock loads reduced the removal ratios of COD by 3.48 % – 31.73 % compared with the control. A mathematical model was developed for COD decomposition and the results obtained from the model were approximately close to the experimental data, and the maximum difference between the experimental and the theoretical removal rates was 3.36 % at a shock organic load of 1019.20 mg COD/L. In addition, the reactor performance was evaluated under successive organic shock loads so, a constant influent COD value of 1249.5 mg/L was applied for eight successive batch cycles and the results indicated that the removal ratio gradually improved with successive loading. As well, to enhance treatment efficiency under organic shock loads the performance of the reactor was evaluated for different MLSS concentrations of 2000, 2600, 3200, 3900, 4200, 4600, 4825, and 5250 mg/L. Three different organic shock loads with COD concentrations of 1043.04, 1205.36, and 1560 mg/L. COD removal ratios of 96.23 %, 86.18 %, and 75.81 % were achieved for the first, second, and third shock loads respectively at a MLSS concentration of 4825 mg/L however, it dropped when MLSS concentration increased to 5250 mg/L.

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Integrating Suspended Sludge and Fixed Film into a Biological Wastewater Treatment System to Enhance Nitrogen Removal

Bui,

Phan,

Nguyen

et al. 2024

Processes

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Integrated fixed-film activated sludge (IFAS) technology greatly enhances nitrogen removal effectiveness and treatment capacity in municipal wastewater treatment plants, addressing the issue of limited land availability. Hence, this method is appropriate for treating household wastewater from office buildings. The research was conducted at the wastewater treatment plant in an office building in Ho Chi Minh City, Vietnam. Experiments were conducted to ascertain the most favorable working conditions, including hydraulic retention time (HRT), alkalinity dosage, and dissolved oxygen (DO). According to the study, the IFAS system had the highest nitrogen removal effectiveness when operated at a hydraulic retention time (HRT) of 7 h, an alkalinity dose of 7.14 mgCaCO3/mgN-NH4+, and a dissolved oxygen (DO) value of 6 mg/L. The nitrification efficiency ranges from 89.2% to 98.8%. The N-NO3− concentration post-treatment is within the range of 27–45 mgN-NO3−/L, which is lower than the allowable discharge limit of 60 mg/L as per Vietnam’s wastewater discharge requirements. The research findings have enhanced the efficiency of the office building management process, thereby promoting the sustainable growth of society.

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Effect of recirculation ratio on the performance of modified septic tank in treating office building wastewater

Cited by 3 publications

References 16 publications

Inactivation of Escherichia coli in domestic wastewater by modified septic tank treatment

Inactivation of Escherichia coli in domestic wastewater by modified septic tank treatment

Enhancement of SBR’s treatment under organic shock load

Integrating Suspended Sludge and Fixed Film into a Biological Wastewater Treatment System to Enhance Nitrogen Removal

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