scholarly journals Treatment of catfish processing wastewater by the combination of anaerobic and aerobic package cage rotating biological contactors

2017 ◽  
Vol 1 (T1) ◽  
pp. 122-130
Author(s):  
Viet Hoang Le ◽  
Duc Hue Ngo ◽  
Thuan Huu Nguyen ◽  
Ngan Vo Chau Nguyen
Keyword(s):  
Retention Time ◽  
Anaerobic Condition ◽  
Hydraulic Retention Time ◽  
Aerobic Condition ◽  
National Standards ◽  
Treatment Technology ◽  
Second Stage ◽  
Rotating Biological Contactors

The study aimed to diversify the treatment technology of catfish processing wastewater. The experiments were implemented on lab-scale package cage rotating biological contactors with the first stage in anaerobic condition and the second stage in the aerobic condition, using PVC flexible conduit medium. The selected hydraulic retention time of anaerobic stage was 12 hours, and that of aerobic rotating package cage biological contactor was 4 hour 12 minutes. The results showed that almost monitoring parameters (pH, SS, DO, COD, BOD5, TKN, Ptotal) met the national standards of QCVN 11-MT:2015/BTNMT (column A), except +NH4 only reached the QCVN 11-MT:2015/BTNMT (column B). The results confirmed that combining both anaerobic and aerobic package cage rotating biological contactors with PVC flexible conduict medium could apply to treat catfish processing wastewater.

Simultaneous removal of nitrogen and phosphorus in a two-biofilter system

2000 ◽  
Vol 41 (12) ◽  
pp. 101-106 ◽  
Author(s):  
D. Pak ◽  
W. Chang
Keyword(s):  
Retention Time ◽  
Phosphorus Removal ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Aerobic Condition ◽  
Nitrogen Loading ◽  
Simultaneous Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Factors Affecting

A two-biofilter system operated under alternate conditions of anaerobic/aerobic was tested to simultaneously remove nitrogen and phosphorus from sewage. The factors affecting simultaneous removal of nitrogen and phosphorus by the two-biofilter system were investigated. Those factors appeared to be influent COD/T-N and COD/T-P ratio, nitrogen loading rate and hydraulic retention time. Nitrite and nitrate produced in the biofilter in aerobic condition affected phosphorus removal by the two-biofilter system. The amount of biomass wasted during the backwash procedure also affected total nitrogen and phosphorus removal by the system.

scholarly journals The Impact of Hydraulic Retention Time on the Biomethane Production from Palm Oil Mill Effluent (POME) in Two-Stage Anaerobic Fluidized Bed Reactor

2020 ◽  
Vol 10 (1) ◽  
pp. 11-16
Author(s):  
Laily Isna Ramadhani ◽  
Sri Ismiyati Damayanti ◽  
Hanifrahmawan Sudibyo ◽  
Muhammad Mufti Azis ◽  
Wiratni Budhijanto
Keyword(s):  
Fluidized Bed ◽  
Palm Oil ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Ph Control ◽  
Palm Oil Mill Effluent ◽  
Two Stage ◽  
Second Stage ◽  
Biomethane Production ◽  
Palm Oil Mill

Indonesia is currently the most significant crude palm oil (CPO) producer in the world. In the production ofCPO, 0.7m3 of Palm Oil Mill Effluent (POME) is emitted as the wastewater for every ton of fresh fruit bunches processed in the palm oil mill.With the increasing amount of CPO production, an effective POME treatment system is urgently required to prevent severe environmental damage. The high organic content in the POME is a potential substrate forbio-methane production. The biomethane production is carried out by two groups of microbes, i.e., acidogenic and methanogenic microbes. Each group of bacteria performs optimally at different optimum conditions. To optimize the biomethane production, POME was treated sequentially by separating the acidogenic and methanogenic microbes into two stages of anaerobic fluidized bed reactors (AFBR). The steps were optimized differently according to the favorable conditions of each group of bacteria. Although perfect separation cannot be achieved, this study showed that pH control could split the domination of the bacteria, i.e., the first stage (maintained at pH 4-5) was dominated by the acidogenic microbes and the second stage (kept neutral) was governed by methanogens. In addition to the pH control, natural zeolitewas added as microbial immobilization media in the AFBR to improve the performance of the microorganisms, especially in preventing microbial wash out at short hydraulic retention time (HRT). This study was focused on the understanding of the effect of HRT on the performance of steady-state continuous AFBR. The first stage as the acidogenic reactorwas rununder acidic conditions (pH 4-5) at five different HRTs. In comparison, the second stage as the methanogenic reactorwasrun under the neutral condition at four different HRTs. In this work,short HRT (5 days) resulted in better performance in both acidogenic AFBR and methanogenic AFBR. The immobilization media was hence essential to reduce the risk of washout at such a short HRT. The two-stage system also resulted in quite a high percentage of soluble chemical oxygen demand (sCOD) removal, which was as much as 96.06%sCOD.

Mathematical Simulation Study on Performance of Different Opposite Folded Plate Anaerobic Sewage Treatment Technology

2012 ◽  
Vol 518-523 ◽  
pp. 2580-2584
Author(s):  
Sheng Nan Li ◽  
Jun Nan ◽  
Hao Yu Li
Keyword(s):  
Mathematical Simulation ◽  
Simulation Study ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Sewage Treatment ◽  
Simulation Software ◽  
Treatment Technology ◽  
Operation Conditions ◽  
Simulated Effluent ◽  
Actual Operation

The effect of different hydraulic retention time on the removal of COD, nitrogen and phosphorous when influent COD was 1000 mg/L were carried out by establishing simulation model with the help of mathematical simulation software BioWin3.0 on the computer and adjusting the parameters continuously combined with the actual operation of anaerobic sewage treatment technology, then compared and analyzed the effect of the simulated effluent and the actual effluent. The results showed that the model established by mathematical simulation software BioWin3.0 can reflect the actual operation conditions of sewage treatment.

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).

Startup of Seawater Anaerobic Ammonia Oxidation Reactor

2014 ◽  
Vol 884-885 ◽  
pp. 582-585
Author(s):  
Jing Wang ◽  
Jian An Hao ◽  
Ai Jun Zhang ◽  
Bo Yang ◽  
Tian Xiang Jiang ◽  
...  
Keyword(s):  
Retention Time ◽  
Hydraulic Retention Time ◽  
Ammonia Oxidation ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Second Stage ◽  
Nitrite Nitrogen ◽  
Anaerobic Ammonia Oxidation ◽  
Oxidation Reactor ◽  
Two Stages

Muds and water samples collected from the Bohai Sea were selected to build seawater anaerobic ammonia oxidation reactor. The reaction volume was 18 L. The startup of reactor was divided into two stages. The first stage lasted five months and hydraulic retention time was 18L/7 d. The second stage lasted a month and hydraulic retention time was 18L/14 d. Ammonia and nitrite of influent and effluent were monitored. During the first stage, the removal rate of ammonia nitrogen was around 50% and the nitrite nitrogen increased by 50%. During the second stage, the removal rate of ammonia nitrogen reached more than 75% and the removal rate of nitrite nitrogen reached more than 90%. The removal ratio of ammonia nitrogen and nitrate nitrogen was about 1:1.17. These results suggested reactor start-up successful. Microbial community in reactor was monitored by polymerase chain reaction. Once the reactor started, specific bands of anaerobic ammonia oxidation microorganisms were found.

scholarly journals Effect of hydraulic retention time on nitrogen removal in domestic wastewater by partial nitritation and Anammox processes

2020 ◽  
Vol 14 (2) ◽  
pp. 127-136
Author(s):  
Nguyen Thi My Hanh ◽  
Tran Thi Hien Hoa
Keyword(s):  
Nitrogen Removal ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Domestic Wastewater ◽  
Treatment Efficiency ◽  
Treatment Technology ◽  
Partial Nitritation ◽  
Conventional Technology ◽  
Nitrogen Treatment ◽  
Anammox Process

The nitrogen treatment technology using the Anammox process is known to have advantages over conventional technology of nitrification - denitrification. For the purpose of evaluating the effect of hydraulic retention time to nitrogen removal in domestic wastewater by Anammox process, the authors conducted the study on partial nitritation and Anammox reactors, separately. Partial nitritation (PN) reactor used Felibendy plate material with Nitrosomonas bacteria while Anammox (AX) reactor used Felibendy cubes carrier material with strain Candidatus Brocadia anammoxidans. This study was implemented during 210 days. The nitrogen treatment efficiency of the system was evaluated with different hydraulic retention times (HRTs). The short HRT of 4.5 hours in the AX reactor affected to the total nitrogen treatment efficiency is low of 52.76 ± 1.29%. With the hydraulic retention times in PN + AX reactors of 9 and 6 hours, the effluent quality met the requirements of B-column according to QCVN 14:2008/BTNMT or QCVN 40:2011/BTNMT. Keywords: Nitrosomonas; Candidatus Brocadia anammoxidans; partial nitritation process; Anammox process; nitrogen treatment.

Enhanced flocculation/sedimentation process by a jet mixed separator

1998 ◽  
Vol 37 (10) ◽  
pp. 55-67 ◽  
Author(s):  
Yoshimasa Watanabe ◽  
Shinsuke Kasahara ◽  
Yoshihiko Iwasaki
Keyword(s):  
Retention Time ◽  
Large Scale ◽  
Suspended Solids ◽  
Hydraulic Retention Time ◽  
Vertical Plane ◽  
Solids Concentration ◽  
Filtration System ◽  
Physico Chemical ◽  
Inclined Tube ◽  
Rotating Biological Contactors

This paper deals with the performance of a jet mixed separator (JMS) which has a series of porous plates inserted in the channel perpendicular to a flow. The water passes through holes in the plates, thus creating jets which gently mix the water on itself. Simultaneous flocculation of suspended particles and sedimentation of grown-flocs occur in the JMS, because large-scale eddies in the vertical plane are almost absent in it. The JMS incorporated with inclined tube settlers was applied to the rapid sand filtration system instead of the combination of mechanical flocculator and sedimentation basin. The turbidity of JMS effluent was constantly below 1 TU at the hydraulic retention time of about 1 hour. The JMS without inclined tube settlers was used as physico-chemical pretreatment process for the rotating biological contactors. The BOD and suspended solids concentration of JMS effluent were around 50 and 40 mg/L, respectively at the hydraulic retention time of 45 min.

The nitrogen removal potential of predenitrification systems in sensitive coastal areas

1995 ◽  
Vol 32 (7) ◽  
pp. 135-142
Author(s):  
E. Görgün ◽  
N. Artan ◽  
D. Orhon ◽  
R. Tasli
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Treatment Process ◽  
Hydraulic Retention Time ◽  
Domestic Sewage ◽  
Coastal Areas ◽  
Careful Evaluation ◽  
Denitrification Kinetics

Effective nitrogen removal is now required to protect water quality in sensitive coastal areas. This involves a much more difficult treatment process than for conventional domestic sewage as wastewater quantity and quality exhibits severe fluctuations in touristic zones. Activated sludge is currently the most widely used wastewater treatment and may be upgraded as a predenitrification system for nitrogen removal. Interpretation of nitrification and denitrification kinetics reveal a number of useful correlations between significant parameters such as sludge age, C/N ratio, hydraulic retention time, total influent COD. Nitrogen removal potential of predenitrification may be optimized by careful evaluation of wastewater character and the kinetic correlations.

Evaluation of a tropical single-cell waste stabilization pond system for irrigation

1995 ◽  
Vol 31 (12) ◽  
pp. 267-273 ◽  
Author(s):  
B. S. O. Ceballos ◽  
A. Konig ◽  
B. Lomans ◽  
A. B. Athayde ◽  
H. W. Pearson
Keyword(s):  
Single Cell ◽  
Removal Efficiency ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Full Scale ◽  
Waste Stabilization Pond ◽  
North East ◽  
Helminth Eggs ◽  
Waste Stabilization ◽  
Better Than

A single full-scale primary facultative pond in Sapé, north-east Brazil was monitored for performance and efficiency. The pond had a hydraulic retention time of 61 days and achieved a 95% BOD5 removal efficiency and had no helminth eggs in the effluent. The effluent failed to meet the WHO faecal coliform guideline for unrestricted irrigation. The pond was dominated by the cyanobacterium Microcystis and gave better than predicted orthophosphate removal. Details of how the system could be simply upgraded utilizing the same land are discussed.

Factors affecting phosphorus removal in two biofilter system treating wastewater from car-washing facility

2000 ◽  
Vol 41 (4-5) ◽  
pp. 487-492 ◽  
Author(s):  
D. Pak ◽  
W. Chang
Keyword(s):  
Phosphorus Removal ◽  
Phosphorus Content ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Aerobic Condition ◽  
Suspended Solid ◽  
Nitrogen Loading ◽  
Operational Parameters ◽  
Factors Affecting ◽  
Biological Filter

A two-biofilter system operated under alternating anaerobic/aerobic conditions was tested to remove nutrient as well as organics from wastewater generated from car-washing facility. The wastewater was characterized by relatively low organic and high phosphorus content. The factors affecting phosphorus removal in the two-biofilter system were investigated. Operational parameters examined in this study were hydraulic retention time, organic, suspended solid and nitrogen loading rate. The factors affecting phosphorus removal in biological filter appeared to be influent COD, COD/T–P, BOD/COD, nitrogen, and SS/T–P. Nitrite and nitrate produced in the biofilter in aerobic condition affected phosphorus removal by the two-biofilter system. The biomass wasted during backwash procedure also affected total phosphorus removal by the system.

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