scholarly journals Effect of mixed liquor volatile suspended solids (MLVSS) and hydraulic retention time (HRT) on the performance of activated sludge process during the biotreatment of real textile wastewater

2014 ◽  
Vol 5 ◽  
pp. 1-8 ◽  
Author(s):  
Kapil Kumar ◽  
Gaurav Kumar Singh ◽  
M.G. Dastidar ◽  
T.R. Sreekrishnan
Keyword(s):  
Activated Sludge ◽  
Retention Time ◽  
Suspended Solids ◽  
Hydraulic Retention Time ◽  
Textile Wastewater ◽  
Activated Sludge Process ◽  
Mixed Liquor

scholarly journals Efficiency of the work of almond shells as biological carriers in activated sludge aeration tanks: كفاءة عمل قشور اللوز كحوامل بيولوجية في أحواض التهوية بالحمأة المنشطة

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Raghad Salim Al-Shalabi, Naeima Ajib, Mahmoud Fattamah
Keyword(s):  
Activated Sludge ◽  
Removal Efficiency ◽  
Retention Time ◽  
Suspended Solids ◽  
Hydraulic Retention Time ◽  
Aeration Tank ◽  
Sludge Treatment ◽  
Mixed Liquor ◽  
Conventional Activated Sludge ◽  
Fixed Film

Based on the interest in environmentally friendly materials for wastewater treatment, this research is aimed at evaluating the efficiency of almond shells work as biological carriers in activated sludge aeration tanks, known as the integrated fixed-film activated sludge treatment, a hybrid tank with attached growth and suspended growth is obtained. Almond shells were placed at 7% of the size of the aeration tank throughout the experiment period for about 4 months with a number of indicators such as hydraulic retention time and mixed liquor suspended solids. Two sets of experiments were performed, the first group with a constant hydraulic retention time ( HRT= 4 hours), and mixed liquor suspended solids was changed (500-1000-2000-3000 mg/ L), with the best removal efficiency at MLSS = 2000 mg/ l, by 91.3% and 92.1% for COD and SS respectively. The optimal MLSS concentration was adopted for the second group of experiments where HRT was increased to 5 and 6 hours. As a result, the best chain was found to be MLSS = 2000 mg/ l and HRT = 5 hours, with a removal efficiency of 93.4% and 93.9% for COD and SS respectively. As a result, the rate of return activated sludge was reduced from 100% to 60% and the rate of inflow into the aeration tank was increased due to the reduction HRT from 6 hours to 5 hours compared to conventional activated sludge treatment.

Solids routing in an activated sludge process during hydraulic overloads

1996 ◽  
Vol 34 (3-4) ◽  
pp. 9-16 ◽  
Author(s):  
Youngchul Kim ◽  
Wesley O. Pipes
Keyword(s):  
Activated Sludge ◽  
Suspended Solids ◽  
Quantitative Description ◽  
Settling Tank ◽  
Plant Performance ◽  
Activated Sludge Process ◽  
Mixed Liquor ◽  
Solids Concentration ◽  
Storm Flow ◽  
The Individual

In order to provide a quantitative description of solids wash-out from the settling tanks of an activated sludge process, a method for “routing” of the suspended solids through the settling tanks was developed. The objective was to develop a method which can be used to predict the mixed liquor suspended solids concentration (X) and the sludge blanket depth (SBD) in the clarifiers during transient hydraulic overloads. There were 27 individual hydraulic overloading events encountered during 31 months of study. The solids routing and the SBD prediction were performed for the individual storm flow events by using settling tank operating data. The results of solids routing analysis were found to be satisfactory. The mixed liquor solids concentration can be predicted within ± 10%. The application of a solids storage relationship developed for the settling tanks was found to be useful for describing the dynamic behavior of the SBD during transient hydraulic overloads. The solids wash-out predictions for rainstorm periods corresponded with the plant performance. Operational procedures for avoiding solids wash-out are also discussed.

Operating Experiences at Low Solids Retention Time

1984 ◽  
Vol 16 (12) ◽  
pp. 661-672 ◽  
Author(s):  
T E Wilson ◽  
W A Ambrose ◽  
H O Buhr
Keyword(s):  
Activated Sludge ◽  
Retention Time ◽  
Suspended Solids ◽  
Volume Index ◽  
Sludge Volume Index ◽  
Effluent Quality ◽  
Mixed Liquor ◽  
Solids Retention Time ◽  
Solids Retention ◽  
Typically Achieving

Five full scale activated sludge plants have been operated at low solids retention time (SRT, monthly averages as low as 0.8 days) and mixed liquor suspended solids (MLSS, monthly averages as low as 500 mg/l) values for 2 to 3 years. Operating results for this period are compared to 3 to 3-1/2 years of operation at conventional, higher, SRT and MLSS values. The data show that the lower SRT operation provided better effluent quality, typically achieving less than 15 mg/l of BOD5 or suspended solids, while not significantly increasing either the total (dry) sludge production or the sludge volume index (SVI). These data indicate that plants can be built and operated using significantly smaller tankage than conventionally accepted.

Influence of hydraulic retention time on indigenous microalgae and activated sludge process

2016 ◽  
Vol 91 ◽  
pp. 277-284 ◽  
Author(s):  
Anbarasan Anbalagan ◽  
Sebastian Schwede ◽  
Carl-Fredrik Lindberg ◽  
Emma Nehrenheim
Keyword(s):  
Activated Sludge ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Activated Sludge Process

scholarly journals Penggunaan limbah tempe dalam biodegradasi zat warna azo menggunakan bioreaktor membran aerob-anaerob

2018 ◽  
Vol 8 (3) ◽  
pp. 104
Author(s):  
Putri Sri Komala ◽  
Agus Jatnika Effendi ◽  
IG Wenten ◽  
W Wisjnuprapto
Keyword(s):  
Activated Sludge ◽  
Yeast Extract ◽  
Retention Time ◽  
Azo Dye ◽  
Membrane Bioreactor ◽  
Dye Removal ◽  
Hydraulic Retention Time ◽  
Activated Sludge Process ◽  
Industry Effluent ◽  
Remazol Black

Tempeh waste is a form of waste that still has an economic value, due to its relatively high organic and nutrient content compared to yeast extract. In this research, tempeh waste was used as a co-substrate for the removal of azo dye from textile industry effluent using an aerobic-anaerobic membrane bioreactor. The bioreactor consists of a modified activated sludge process, i.e. a contact-stabilization process coupled with anoxic reactor and combined with an external ultrafiltration membrane to replace the sedimentation process in conventional activated sludge process. The feed consists of Remazol Black-5 azo dye at a concentration of 110-120 mg/L, and tempeh waste as an organic and nutrient source at 8-10% v/v concentration. An experiment was done to measure the effect of hydraulic retention time on dye removal, by varying the HRT in the contact tank at 1, 1.5, 2, 2.5, and 3 hours, and that of  stabilization- and anoxic tanks kept constant at 4 and 3 hours. From the experiment a 41-51% removal of the dye and 46-65% removal of organic compounds were obtained. The highest dye and organic compound removal was obtained at a contact HRT of 2 hours, namely 51% of dye removal and 65% of organic removal efficiencies. An auto-oxidation process occurs in the contact tank, resulting in an increase in the dye concentration.Keywords: tempeh waste, membrane bioreactor, Hydraulic Retention Time (HRT), contact tank, azo dye. Abstrak Limbah tempe merupakan salah satu limbah yang masih memiliki nilai ekonomis, karena kandungan senyawa organik dan nutrien yang terdapat didalamnya masih relatif tinggi jika dibandingkan dengan yeast extract. Dalam penelitian ini limbah tempe digunakan sebagai ko-substrat untuk penyisihan zat warna azo dari industri tekstil dengan menggunakan bioreaktor membran aerob-anaerob. Bioreaktor terdiri dari modifikasi proses lumpur aktif yaitu proses kontak-stabilisasi yang dihubungkan dengan reaktor anoksik dan dikombinasikan dengan membran ultrafiltrasi secara eksternal. Umpan terdiri dari zat warna azo Remazol Black-5 pada konsentrasi 110-120 mg/L dan limbah tempe sebagai sumber organik dan nutrien dengan konsentrasi 8-10% v/v. Percobaan dilakukan untuk mengamati pengaruh waktu retensi hidrolik (hydraulic retention time, HRT) tangki kontak terhadap penyisihan warna dengan variasi HRT tangki kontak antara 1, 1½, 2, 2½ dan 3 jam, sedangkan tangki stabilisasi dan anoksik pada HRT konstan 4 dan 3 jam. Dari percobaan dihasilkan penyisihan warna berkisar antara 41-51% dan penyisihan senyawa organik antara 46-65%. Baik penyisihan warna maupun senyawa organik terbesar dihasilkan pada HRT kontak 2 jam yaitu 51% untuk penyisihan warna dan 65% untuk penyisihan senyawa organik. Pada tangki kontak terjadi autoksidasi yang menyebabkan kenaikan konsentrasi warna.Kata Kunci: limbah tempe, bioreaktor membran, waktu retensi hidrolik (HRT), tangki kontak, zat warna azo.

scholarly journals PENGOLAHAN AIR LIMBAH DOMESTIK DENGAN PROSES LUMPUR AKTIF YANG DIISI DENGAN MEDIA BIOBALL

2018 ◽  
Vol 3 (2) ◽  
Author(s):  
Nusa Idaman Said ◽  
Kristianti Utomo
Keyword(s):  
Waste Water ◽  
Activated Sludge ◽  
Removal Efficiency ◽  
Retention Time ◽  
Treatment Process ◽  
Hydraulic Retention Time ◽  
Activated Sludge Process ◽  
Organic Loading ◽  
Circulation Ratio ◽  
Increase Efficiency

Recently, the treatment process of waste water contains organic pollutant which used in Indonesia especially in Jakarta is activated sludge process. The problem is its treated water quality which frequently does not yet fulfilled to effluent standard of wastewater. Some affecting factors  are hydraulic retention time (HRT) too short, the fluctuation of wastewater flow rate, unfavorable function of aeration process and also which do not less important is operational mistake caused by insufficient knowledge of operator. To overcome the mentioned problems it is needed technological innovation to increase efficiency of wastewater treatment process especially activated sludge process. This paper describes the study of domestic waste water treatment  using activated sludge process which is filled with bioball plastic media for attaching microorganism to increase efficiency and  keep stability of process. Result of the study shows that within 6 hours hydraulic retention time (HRT), the removal efficiency of COD, BOD, Ammonia and Total Suspended Solids (TSS) were 78.42%, 79.41%, 61.41%, and 82.06% respectively. The most effective of sludge circulation ratio is R=0,5Q. In sludge circulation ratio R= 0,5Q, the removal efficiency of COD, BOD, organic loading coming into bioreactor, the lower  removal efficiency. In organic loading (BOD loading) 0.3 - 1.0 kgBOD/m3.day, the removal efficiency of BOD was 80 - 85 %.  Kata kunci : Air limbah domestik, lumpur aktif, bioball, aerob.

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