Microthrix parvicella foaming at the Fusina WWTP

2002 ◽  
Vol 46 (1-2) ◽  
pp. 499-502 ◽  
Author(s):  
P. Miana ◽  
L. Grando ◽  
G. Caravello ◽  
M. Fabris
Keyword(s):  
Activated Sludge ◽  
Microscopic Observation ◽  
Industrial Wastewater ◽  
The Other ◽  
Physical Parameters ◽  
High Concentration ◽  
Strong Connection ◽  
Mixed Liquor ◽  
Microthrix Parvicella

The Fusina WWTP receives civil and industrial wastewater from Venice and its hinterland. Its treatment capacity is in the range of 4,000–5,000 m3/h. In winter the Fusina WWTP is subjected to brown and viscous foams developed on the surface of the aeration basins and of the clarifiers. The microscopic observation of biological foams and activated sludge samples showed high concentration of the filamentous organism Microthrix parvicella. This paper investigates the growth of M. parvicella from January 1998 to January 1999 and relates it to foams developed on the aeration basins and clarifiers, to temperature, surfactants, BOD5, NH4, NO3, NO2, DO, PO4 and pH of the wastewater influent, to SVI and the other species of filamentous organisms of mixed liquor. The results demonstrate the strong connection of the foams developed with M. parvicella abundance, the synergic action with surfactants, the dependence of M. parvicella on temperature and no relation to the other chemical and physical parameters investigated.

A Real Time Toxicity Bioassay for Activated Sludge Reactor

2003 ◽  
Vol 1 (1) ◽  
Author(s):  
Mimma Pernetti ◽  
Luca Di Palma ◽  
Carlo Merli
Keyword(s):  
Activated Sludge ◽  
Real Time ◽  
Industrial Wastewater ◽  
Inorganic Compounds ◽  
Synthetic Wastewater ◽  
Toxicity Tests ◽  
Toxicity Bioassay ◽  
Simple Modification ◽  
Mixed Liquor ◽  
Activated Sludge Reactor

Activated sludge reactor is commonly employed for the secondary treatment of industrial wastewater, showing a high purification yield, operating simplicity and cost-effectiveness. Nevertheless, industrial wastewater generally contain numerous organic and inorganic compounds which are not biodegradable; heavy metals are often found in effluents from electroplating and metal-processing industries, manufacturing of paints, plastics, scientific instruments, salts are found in wastewater from production of pesticides, pharmaceutical and food industry, waste-dump percolating water. Primary treatments are often designed to reduce heavy metal and salt contents in wastewater, nevertheless trace concentrations persist and may reach the biological reactor, resulting in biomass inhibition and dramatic loss in purification efficiency. Respirometry through Oxygen Uptake Rate measurement is one of the most rapid and reliable methods to assess the inhibition of activated sludge. In previous studies toxicity tests for specific compounds have been performed following different procedures and attaining heterogeneous results. In this work a simple modification of the configuration is proposed, in order to assess in real time the toxicity and the inhibiting effect of the incoming wastewater before it reaches the reactor. A sample is drawn from the influent and a respirometric test is performed on mixed liquor collected from the reactor itself. If the inhibition exceeds the limit, the influent is sent to storage and to an alternative treatment. Preliminary experiments were carried out with bench-scale CSTR, supplied with synthetic wastewater. Copper sulphate and sodium chloride were chosen as inhibiting compounds, supplied separately to batch samples of activated sludge in shock load at different concentrations. Copper concentration in the mixed liquor was measured by atomic absorption and salt concentration was determined through conductance measures. Inhibition up to 90% was evaluated by OUR test with short response time, demonstrating the suitability of this tool to a real time toxicity bioassay for activated sludge reactor.

scholarly journals PENURUNAN KONSENTRASI WARNA LIMBAH CAIR SASIRANGAN MENGGUNAKAN ADSORBENlLIMBAH PADAT. LUMPUR-AKTIF TERAKTIVASI INDUSTRI KARET

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Riza Miftahul Khair ◽  
Nopi Stiyati Prihatini ◽  
Apriani Apriani ◽  
Vita Pramaningsih
Keyword(s):  
Activated Sludge ◽  
Industrial Wastewater ◽  
Adsorption Process ◽  
Ph Value ◽  
Aquatic Organisms ◽  
Textile Wastewater ◽  
Operating Conditions ◽  
Waste Activated Sludge ◽  
High Concentration ◽  
Industrial Sludge

Limbah cair sasirangan memiliki tingkat pencemaran yangktinggi dan belummmemenuhi standar untuk dibuang ke lingkungan, sehingga harus dilakukan pengolahan terlebih dahulu. Pembuangan air limbah industri tekstilkke lingkungan tanpa adanya proses pengolahan dapat merusak ekosistem dan menjadi racun bagi organisme air, bahkan beberapa jenis pewarnaadiduga bersifat karsinogen dan membahayakankkesehatan manusia. Metode yang dapat digunakan untuk menurunkankkonsentrasi warna pada airllimbah, salah satunya adalah proses adsorpsi. Salah satu jenis adsorben yang sering digunakan dalam pengolahan air limbah serta dinilai sangattcocok untuk mengurangi zat organik dan warna yaitu karbon aktif. Pada penelitian ini dilakukan analisis penurunan konsentrasi warna limbah cair industri sasirangan menggunakan adsorben yang terbuat dari limbah padat lumpur-aktif.industri karet berbentuk bubuk (powder), denganaaktivasi adsorben menggunakan KOH. Hasil karakteristik limbah cair sasirangan Kampung Sasirangan Banjarmasin yaitu memiliki konsentrasi warna, BOD dan COD yang tinggi, memiliki nilai pH basa yaitu 11 serta konsentrasi logam Cr, Cu dan Cd yang sesuai dengan baku mutu. Sedangkan untuk kondisi operasi terbaik dalam proses adsorpsi warna menggunakan adsorben limbah lumpur–aktif karet adalah pada pH 3, dosis 9 g/L dan waktukkontak 150 menit (2,5 jam) dengannkapasitas adsorpsi 675,7 Pt.Co/g. Kata Kunci: Adsorpsi, limbah lumpur aktif, sasirangan, warna. ABSTRACT  Sasirangan textile wastewater has high pollutant power and has not met the requirements to be disposed of into the environment, so it must be treated first. The disposal of textile industrial wastewater to the environment without going through the processing process can damage the ecosystem and become toxic to aquatic organisms, even some types of dyes are thought to be carcinogens and endanger human health. One of the methods that can be used to reduce the color concentration in wastewater is the adsorption process. One type of adsorbent that is commonly used in wastewater treatment and is considered very suitable for reducing organic matter and color is activated carbon. In this study, an analysis of the decrease in the color concentration of the sasirangan industrial wastewater was carried out using an adsorbent made of powdered solid waste of activated rubber industrial sludge with adsorbent activation using KOH. The results of the characteristics of the Sasirangan wastewater in Sasirangan Village, Banjarmasin, namely having a high concentration of color, BOD and COD, having an alkaline pH value of 11 and concentrations of Cr, Cu and Cd metals in accordance with quality standards. As for the best operating conditions in the color adsorption process using waste activated sludge rubber adsorbent is at a pH of 3, a dose of 9 g / L and a contact time of 150 minutes (2.5 hours) with an adsorption capacity of 675.7 Pt.Co/g.  Keywords: Adsorption, colour, sasirangan, waste activated sludge.

Assessment of micro and macro nutrients in poultry feeds available in Dhaka city, Bangladesh.

2017 ◽  
Vol 1 ◽  
pp. 264
Author(s):  
Md Didarul Islam ◽  
Ashiqur Rahaman ◽  
Fahmida Jannat
Keyword(s):  
Heavy Metals ◽  
Adverse Effect ◽  
The Other ◽  
Nutrient Level ◽  
Dhaka City ◽  
Toxic Heavy Metals ◽  
High Concentration ◽  
Low Concentration ◽  
Feed Formulation ◽  
Macro Nutrients

This study was based on to determine the concentration of macro and micro nutrients as well as toxic and nontoxic heavy metals present in the chicken feed available in Dhaka city of Bangladesh. All macro nutrients, if present in the feed at high concentration have some adverse effect, at the same time if this nutrient present in the feed at low concentration this have some adverse effect too. So that this nutrient level should be maintained at a marginal level. On the other side toxic heavy metals if present in the feed at very low concentration those can contaminate the total environment of the ecosystem. In this study six brand samples (starter, grower, finisher and layer) which was collected from different renowned chicken feed formulation industry in Bangladesh. Those samples were prepared for analysis by wet ashing and then metals were determined by Atomic Absorption Spectroscopy. It was found that 27.7 to 68.4, 57.3 to 121.9, 0.21 to 4.1, 0.32 to 2.1, 0.11 to 1.58, 0.28 to 2.11 and 0.28 to 1.78 for zinc, iron, copper, mercury, cadmium, nickel and cobalt respectively. It was found that essential macro and micro nutrients were present in the feed in low concentration on the other side mercury was present in high concentration in the feed samples.

Solid, slightly soluble phosphorus compounds as nutrient source in activated sludge treatment of forest industry wastewaters

1997 ◽  
Vol 35 (2-3) ◽  
pp. 131-138 ◽  
Author(s):  
Pirjo-Riitta Rantala ◽  
Hannu Wirola
Keyword(s):  
Activated Sludge ◽  
The Other ◽  
Phosphorus Compounds ◽  
Forest Industry ◽  
Phosphorus Concentration ◽  
Nutrient Source ◽  
Sludge Treatment ◽  
Grain Sizes ◽  
Soluble Phosphorus ◽  
The Mean

The aim of the study was to determine if solid, slightly soluble compounds can be used as nutrient source in activated sludge treatment plants instead of liquid phosphoric acid. Four different solid materials were tested in lab-scale solubility tests to find compounds which are least soluble. Two materials were chosen for further studies: apatite and raw phosphate. The use of apatite and raw phosphate as nutrient source was studied in lab-scale activated sludge reactors along with a control reactor where phosphorus was added in liquid form. The phosphorus dosage, measured as elementary phosphorus, was the same for all three reactors. The reactors were fed with pre-clarified chemi-thermomechanical pulp mill (CTMP) wastewater. There were no significant differences in the reductions of organic matter between the three reactors. The mean effluent concentration of total phosphorus was 3 mg P/l in the control reactor and less than 1 mg P/1 in the other two reactors. The soluble phosphorus concentration was more than 2 mg P/l in the control reactor and less than 0.5 mg P/l in the other two. Apatite was an even better nutrient source than raw phosphate. Further lab-scale tests were conducted using two different grain sizes of apatite. No significant differences were found between the studied grain sizes (<0.074 mm and 0.074 mm-0.125 mm). Apatite was then used in full-scale at a CTMP-mill two different times. The experiments showed that the mean concentrations of phosphorus can be reduced radically by using apatite as a nutrient source instead of liquid phosphorus. Solid phosphorus compounds are a viable alternative to reduce the phosphorus load from forest industry wastewater treatment plants.

Evaluating the treatment performance of a full scale Activated Sludge Plant in Islamabad, Pakistan

2012 ◽  
Vol 7 (1) ◽  
Author(s):  
S. S. Fatima ◽  
S. Jamal Khan
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Full Scale ◽  
Operational Parameter ◽  
Mixed Liquor ◽  
Treatment Performance

In this study, the performance of wastewater treatment plant located at sector I-9 Islamabad, Pakistan, was evaluated. This full scale domestic wastewater treatment plant is based on conventional activated sludge process. The parameters which were monitored regularly included total suspended solids (TSS), mixed liquor suspended solids (MLSS), mixed liquor volatile suspended solids (MLVSS), biological oxygen demand (BOD), and chemical oxygen demand (COD). It was found that the biological degradation efficiency of the plant was below the desired levels in terms of COD and BOD. Also the plant operators were not maintaining consistent sludge retention time (SRT). Abrupt discharge of MLSS through the Surplus Activated sludge (SAS) pump was the main reason for the low MLSS in the aeration tank and consequently low treatment performance. In this study the SRT was optimized based on desired MLSS concentration between 3,000–3,500 mg/L and required performance in terms of BOD, COD and TSS. This study revealed that SRT is a very important operational parameter and its knowledge and correct implementation by the plant operators should be mandatory.

Micronutrient supplements for optimisation of the treatment of industrial wastewater using activated sludge

1999 ◽  
Vol 33 (18) ◽  
pp. 3707-3714 ◽  
Author(s):  
Joanna E Burgess ◽  
Joanne Quarmby ◽  
Tom Stephenson
Keyword(s):  
Activated Sludge ◽  
Industrial Wastewater

scholarly journals STUDIES ON THE BACTERIOPHAGE OF D'HERELLE

1925 ◽  
Vol 42 (4) ◽  
pp. 483-497 ◽  
Author(s):  
Jacques J. Bronfenbrenner ◽  
Charles Korb
Keyword(s):  
Quantitative Evaluation ◽  
Bacterial Species ◽  
Relative Concentration ◽  
Serial Dilution ◽  
The Other ◽  
Resistant Bacteria ◽  
Dilution Method ◽  
High Concentration ◽  
Average Size ◽  
Broth Dilution

The experiments reported above confirm the fact that lytic principle is distributed in active solution in a state of indivisible units. This permits its quantitative evaluation by serial dilution, as well as by plating on agar. The latter method, however, often gives readings considerably lower than those obtained by the broth dilution method of titration. By varying the concentration of agar it has been possible to show that the discrepancy is due to adsorption of the lytic agent on agar. When the concentration of the latter is increased from 0.3 per cent to 2.5 per cent the number of plaques of lysis is reduced more than 100 times. At the same time the average size of the plaques also decreases approximately to one-tenth of the original. The size, as well as the number of plaques, has been found to depend also on the condition of the culture employed in titration. Thus, when the culture exposed to the action of lytic agent is composed of young susceptible bacteria, the greater the concentration of bacteria, the smaller the plaques. When the culture is composed partly of young and partly of old susceptible bacteria, both the size and the number of the plaques are diminished with the increase in the relative concentration of old bacteria. On the other hand, presence in the culture of resistant bacteria does not affect either the size or the number of the plaques so long as the relative concentration of susceptible bacteria in the culture is sufficient to allow formation of them. The plaques appearing in the presence of a high concentration of resistant variants in the culture are relatively indistinct owing to overgrowth. Under carefully controlled conditions the size of plaques is found to be determined by the character of the lytic filtrate. Thus in the case of lytic agents which act upon more than one bacterial species the size of the plaques remains constant, irrespective of the bacterial substratum used for the production of the active filtrate.

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