scholarly journals Evaluation of sequential aerated treatment of wastewater from hardboard mill

1998 ◽  
Vol 41 (3) ◽  
pp. 284-287
Author(s):  
S. Videla ◽  
C. Isaacs ◽  
M. Cristina Diez
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Organic Content ◽  
Bench Scale ◽  
Sequential System ◽  
Start Up ◽  
High Organic Content

Wastewater from a hardboard mill characterized by a high organic content (15-30 g/L COD) was studied in a bench scale sequential aerated system in order to define a start up strategy. Inlet COD concentration varied from 0.5 to 25 g/L and the hydraulic retention time was maintained at 5 days. The sequential system proposed could reduce BOD, COD, TSS and phenol over 90% except when the inlet COD concentration was lower than 25 g/L.

scholarly journals Start-up of UASB reactors treating municipal wastewater and effect of temperature/sludge age and hydraulic retention time (HRT) on its performance

2015 ◽  
Vol 8 (6) ◽  
pp. 780-786 ◽  
Author(s):  
Hina Rizvi ◽  
Nasir Ahmad ◽  
Farhat Abbas ◽  
Iftikhar Hussain Bukhari ◽  
Abdullah Yasar ◽  
...  
Keyword(s):  
Retention Time ◽  
Municipal Wastewater ◽  
Hydraulic Retention Time ◽  
Effect Of Temperature ◽  
Start Up ◽  
Uasb Reactors

Effect of effluent circulation and hydraulic retention time (HRT) on the performance of a modified anaerobic baffled reactor (MABR) during start-up period

2015 ◽  
Vol 57 (40) ◽  
pp. 18597-18605 ◽  
Author(s):  
Maizatul Asnie Mohd Aris ◽  
Shreeshivadasan Chelliapan ◽  
Mohd Fadhil Md. Din ◽  
Aznah Nor Anwar ◽  
Rafidah Shahperi ◽  
...  
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Anaerobic Baffled Reactor ◽  
Start Up

Rapidly Start-Up and Performance of the EGSB Reactor Treating Actual Coking Wastewater when Seeded with Digestion Sludge

2013 ◽  
Vol 726-731 ◽  
pp. 2567-2571
Author(s):  
Chun Juan Dong ◽  
Qing Ye Pan ◽  
Hong Yu Lu ◽  
Ya Quan Sun
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Granular Sludge ◽  
Total Biomass ◽  
Coking Wastewater ◽  
Brewery Wastewater ◽  
Granulation Process ◽  
Start Up ◽  
Removal Efficiencies ◽  
And Performance

To accomplish rapidly the granulation process of digestion sludge for the treatment of actual coking wastewater and meanwhile achieve high COD, phenol, SCN- and CN- removal, the EGSB reactor was employed with two operation stages. StageI: Granular sludge was formed from digestion sludge using brewery wastewater as substrate in the anaerobic way (meanwhile adding little granules, which were 1/7 of the total biomass). StageII: Granular sludge was acclimatized with the actual coking wastewater through continuous micro-oxygenation way. The experimental results showed that the granular sludge could quickly form in 10d in the EGSB reactor seeded with digestion sludge and little loose granules. It took only about 6 months for the successful micro-aerobic acclimating of the granular sludge by the actual coking wastewater. The removal efficiencies of COD, phenol, SCN- and CN- were 72.9, 99.5, 95.7 and 97.5%, respectively, at 12.1h hydraulic retention time (HRT) and for 631-922, 12.8-37.7, 66.7-232.7 and 0.3-57.8mg.L-1 influent COD, phenol, SCN- and CN- concentration.

Control of disinfection byproduct (DBP) precursors by soil aquifer treatment (SAT): what length of hydraulic retention time (HRT) is necessary?

2016 ◽  
Vol 16 (6) ◽  
pp. 1648-1658 ◽  
Author(s):  
Songkeart Phattarapattamawong ◽  
Yugo Takabe ◽  
Shinya Echigo ◽  
Sadahiko Itoh
Keyword(s):  
Drinking Water ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Organic Content ◽  
Formation Condition ◽  
Annual Data ◽  
Soil Aquifer Treatment ◽  
Treatment Unit ◽  
Disinfection Byproduct ◽  
Drinking Water Standard

The study attempted to determine the hydraulic retention time (HRT) required for soil aquifer treatment (SAT) to reclaim water as potable water in an aspect of controlling disinfection byproduct (DBP) precursors. In order to evaluate the removal of DBP precursors, the uniform formation condition was used to estimate the formations of trihalomethanes (THMs) and haloacetic acids (HAAs). Effluent water from anaerobic-anoxic-oxic processes (A2O water) was fed through soil columns at different HRTs. Sand with low organic content and less specific surface area was selected to represent the ‘worst available case’ of subsurface environment in Japan. Overall, annual data (n ≥ 14) indicated that the average concentrations of THMs and HAAs for water passed through SAT with HRT less than 7 days were below the standard of drinking water. However, risks of exposure to THMs and HAAs were observed. Increasing HRT to 30 days resulted in the concentrations of regulated THM and HAA species lower than the 10% of the drinking water standard values, except for dichlorobromoform. Therefore, a treatment unit for bromide ion removal (e.g., anion exchanger) prior to chlorination is recommended to lower the risk levels of exposure to dichlorobromoform.

Influence of Hydraulic Retention Time on Start-Up and Process Stability of Polyurethane Carrier Reactions

1992 ◽  
Vol 25 (1) ◽  
pp. 99-106 ◽  
Author(s):  
M. S. T. Rubindamayugi ◽  
H. J. M. Op Den Camp ◽  
H. J. Lubberding ◽  
H. J. Gijzen ◽  
G. D. Vogels
Keyword(s):  
Retention Time ◽  
Volatile Fatty Acids ◽  
Hydraulic Retention Time ◽  
Organic Loading Rate ◽  
Process Stability ◽  
Reactor Performance ◽  
Steady State Condition ◽  
Start Up ◽  
Reactor Operating ◽  
Startup Period

Influence of hydraulic retention time (HRT) on start-up of Polyurethane Carrier Reactors treating Volatile Fatty Acids (VFA) based wastewater, at constant organic loading rate (OLR) was investigated. OLR was increased stepwise after start-up to evaluate the influence of HRT on process stability. Four parallel experiements were conducted at HRTs of 48, 24, 18 and 12 hours. Results indicate an influence of HRT on duration of start-up period, and process stability after start-up. The reactor operating at HRT of 24 hours required only a relatively stort start-up period and showed higher process stability under steady-state condition. Analysis of individual VFA degradation indicated that butyrate and propionate consuming acetogenic bacteria increased in sigmoid fashion during start-up. Changes in acetate degradation do not show the true increase of acetoclastic population. Instead they reflect concomitant activity of VFA catabolizing acetogens and aceloclastic methanogens . Immobilized biomass increased exponentially during the first three weeks of start-up. The differences in start-up periods between reactors was probably due to differences in quality and activity of biomass immobilized at different HRTs. The HRT of 24 hours was most optimal to obtain stable reactor performance within a short startup period.

Start-Up Operation and Hydraulic Retention Time Selectivity for Palm Oil Mill Wastewater at Mesophilic Temperature in Anaerobic Suspended Growth Closed Bioreactor

2014 ◽  
Vol 955-959 ◽  
pp. 1330-1334
Author(s):  
Yee Shian Wong ◽  
Tjoon Tow Teng ◽  
Soon An Ong ◽  
Morad Norhashimah ◽  
Mohd Rafatullah
Keyword(s):  
Palm Oil ◽  
Retention Time ◽  
Anaerobic Degradation ◽  
Hydraulic Retention Time ◽  
Biogas Production ◽  
Oxygen Demand ◽  
Anaerobic Bioreactor ◽  
Start Up ◽  
Palm Oil Mill ◽  
Pome Wastewater

The start-up operation and hydraulic retention time (HRT) selectivity of anaerobic degradation for palm oil mill effluent (POME) wastewater was carried out in an anaerobic bioreactor. HRT between 35 and 5 days were investigated. The start-up process for the anaerobic degradation of POME wastewater was found to be completed after 40 days of operation. This study also recommended that the anaerobic degradation of POME wastewater should be operated at the HRT between 35 and 10 days without acid risk. The performance of anaerobic bioreactor could reach 90.55% - 87.55% chemical oxygen demand (COD) reduction, 0.06 - 0.40 ratio between volatile fatty acid (VFA) and alkalinity (Alk), -368.2 mV to-445.80 mV of oxygen reduction potential (ORP) and 9.08 - 37.2 liters of biogas production, respectively.

Effect of salinity variation on the autotrophic kinetics of the start-up of a membrane bioreactor and hybrid moving bed biofilm reactor-membrane bioreactor at low hydraulic retention time

2017 ◽  
Vol 77 (3) ◽  
pp. 714-720 ◽  
Author(s):  
J. C. Leyva-Díaz ◽  
A. Rodríguez-Sánchez ◽  
J. González-López ◽  
J. M. Poyatos
Keyword(s):  
Retention Time ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Hydraulic Retention Time ◽  
Biofilm Reactor ◽  
Total Biomass ◽  
Municipal Wastewater Treatment ◽  
Moving Bed Biofilm Reactor ◽  
Moving Bed ◽  
Start Up

Abstract A membrane bioreactor (MBR) and a hybrid moving bed biofilm reactor-membrane bioreactor (hybrid MBBR-MBR) for municipal wastewater treatment were studied to determine the effect of salinity on nitrogen removal and autotrophic kinetics. The biological systems were analyzed during the start-up phase with a hydraulic retention time (HRT) of 6 h, total biomass concentration of 2,500 mg L−1 in the steady state, and electric conductivities of 1.05 mS cm−1 for MBR and hybrid MBBR-MBR working under regular salinity and conductivity variations of 1.2–6.5 mS cm−1 for MBR and hybrid MBBR-MBR operating at variable salinity. The variable salinity affected the autotrophic biomass, which caused a reduction of the nitrogen degradation rate, an increase of time to remove ammonium from municipal wastewater and longer duration of the start-up phase for the MBR and hybrid MBBR-MBR.

scholarly journals KOMBINASI PROSES KOAGULASI-FLOKULASI DENGAN SEQUENCHING BATCH REACTOR UNTUK MENURUNKAN KANDUNGAN ORGANIK PADA LIMBAH BATIK

2021 ◽  
Vol 7 (2) ◽  
Author(s):  
Novirina Hendrasarie ◽  
Firra R ◽  
Raden H Kokoh ◽  
Andika Andika
Keyword(s):  
Retention Time ◽  
Organic Material ◽  
Sequencing Batch Reactor ◽  
Hydraulic Retention Time ◽  
Batch Reactor ◽  
Organic Content ◽  
Aluminium Chloride ◽  
Coconut Shell ◽  
Second Stage ◽  
Coagulation And Flocculation

Limbah batik memiliki kandungan organik dan warna, yang sulit untuk digredasi. Tujuan penelitian ini mengembangkan teknologi Sequenching Batch Reactor (SBR) yang dimodifikasi dengan adsorben dari tempurung kelapa dan bamboo. Konsentrasi limbah batik awal, untuk COD sebesar 1965 mg/L, warna 1603 mg/L, TSS 1140 mg/L. Pelaksanaan penelitian terbagi menjadi dua tahap, yaitu tahap pertama limbah diolah menggunakan proses koagulasi dan flokulasi, selanjutnya tahap dua menggunakan Sequencing Batch Reactor. Pada tahap koagulasi-flokulasi, menggunakan koagulan PAC (Poly Aluminium Chloride). Sedangkan pada tahap dua yang menggunakan SBR, diatur Hydraulic Retention Time (HRT) dan berat adsorben (tempurung kelapa, bamboo dan zeolite). Hasil penelitian, didapatkan proses koagulasi dan flokulasi mampu menurunkan kandungan organic (BOD5 dan COD) pada kisaran 80%, Total Suspended Solid (TSS )26% dan warna 55%. Sedangkan pada SBR, didapatkan bahwa penambahan adsorben mengoptimalkan pendegradasian kandungan organic. Didapatkan pada HRT optimal 48 jam, jenis adsorben tempurung kelapa optimal menurunkan kandungan BOD5 sebesar 93%,  COD 93.7% sebesar , TSS 81% mg/L dan warna 81% mg/L.  Kata kunci: kandungan organic dan warna, koagulasi dan flokulasi, sequencing batch reactor (SBR).  The organic content and color of batik wastewater make it difficult to grade. The goal of this research was to create a modified Sequenching Batch Reactor (SBR) using adsorbents made from coconut shells and bamboo. The initial concentrations of COD, color, and TSS in batik wastewater were 1965 mg/L for COD, 1603 mg/L for color, and 1140 mg/L for TSS. The research was divided into two stages, with the first stage involving the use of coagulation and flocculation processes, and the second stage involving the use of a Sequencing Batch Reactor. PAC (Poly Aluminum Chloride) coagulant was used for the coagulation-flocculation stage. Meanwhile, the Hydraulic Retention Time (HRT) and the weight of the adsorbent (coconut shell, bamboo, and zeolite) were set in the second stage using SBR. The coagulation and flocculation processes reduced organic content (BOD5 and COD) by 80 %, total suspended solids (TSS) by 26 %, and color by 55 %, according to the results. In SBR, it was discovered that adding an adsorbent improves the decomposition of organic material. The optimal type of coconut shell adsorbent reduced the level of BOD5 by 93 %, COD by 93.7 %, TSS by 81 % mg/L, and color by 81 % mg/L at an optimal HRT of 48 hours. Keywords: Organic material and color, coagulation and flocculation, sequencing batch reactor (SBR).

scholarly journals Effect of Hydraulic Retention Time (HRT) and Organic Loading Rate (OLR) to the Nata de coco Anaerobic Treatment Eficiency and its Wastewater Characteristics

2018 ◽  
Vol 38 (2) ◽  
pp. 160 ◽  
Author(s):  
Istna Nafi Azzahrani ◽  
Fanny Arivia Davanti ◽  
Ria Millati ◽  
Muhammad Nur Cahyanto
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Anaerobic Treatment ◽  
Organic Content ◽  
Anaerobic Digester ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Working Volume ◽  
Standard Rate

In this study, experiments were conducted to investigate the effect of hydraulic retention time (HRT) and organic loading rate (OLR) on process stability of nata de coco wastewater anaerobic treatment using semi-continuous digester. The standard-rate anaerobic digester with working volume of 8.5 L was used to investigate the effect of three different hydraulic retention times (15, 20, and 25 days), and a standard-rate anaerobic digester with working volume of 9.1 L was operated at different organic loading rates of 0.5, 1, and 1.5 g/L/day. The findings revealed that minimum HRT for nata de coco wastewater anaerobic treatment using semi-continuous digester was achieved at HRT 20 days. Based on data from this study, the reduction of organic content in nata de coco wastewater increased when OLR increased until 1 g/L/day. But then those parameters value decreased when OLR being increased further to 1.5 g/L/day. It showed that at 1.5 g/L/day the amount of substrate fed to the system was exceeding the total degradation capacity of methanogenic microorganisms, hence the organic overload happened and decreased the efficiency of organic content reduction in anaerobic treatment of nata de coco wastewater.

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