Understanding synergistic mechanisms of ferrous iron activated sulfite oxidation and organic polymer flocculation for enhancing wastewater sludge dewaterability

2021 ◽  
Vol 189 ◽  
pp. 116652
Author(s):  
Jing Ai ◽  
Zhiyue Wang ◽  
Dionysios D. Dionysiou ◽  
Ming Liu ◽  
Yun Deng ◽  
...  
Keyword(s):  
Ferrous Iron ◽  
Wastewater Sludge ◽  
Organic Polymer ◽  
Sulfite Oxidation ◽  
Sludge Dewaterability ◽  
Polymer Flocculation

Bioleaching of heavy metals from wastewater sludge by ferrous iron oxidizing bacteria

2016 ◽  
Vol 38 (1) ◽  
pp. 51-55 ◽  
Author(s):  
A. M. Marchenko ◽  
G. N. Pshinko ◽  
V. Ya. Demchenko ◽  
V. V. Goncharuk
Keyword(s):  
Heavy Metals ◽  
Ferrous Iron ◽  
Wastewater Sludge ◽  
Iron Oxidizing Bacteria

scholarly journals Wastewater sludge dewaterability enhancement using hydroxyl aluminum conditioning: Role of aluminum speciation

2016 ◽  
Vol 105 ◽  
pp. 615-624 ◽  
Author(s):  
Bingdi Cao ◽  
Weijun Zhang ◽  
Qiandi Wang ◽  
Yangrui Huang ◽  
Chenrui Meng ◽  
...  
Keyword(s):  
Wastewater Sludge ◽  
Aluminum Speciation ◽  
Sludge Dewaterability

Progress and Research of Organic Polymeric Flocculant in Water Treatment

2011 ◽  
Vol 347-353 ◽  
pp. 707-710
Author(s):  
Yong Zhan ◽  
Yu Wang ◽  
Bin Dong
Keyword(s):  
Wastewater Treatment ◽  
Water Treatment ◽  
External Environment ◽  
Treatment Method ◽  
Development Trend ◽  
Organic Polymer ◽  
Key Factor ◽  
Polymer Flocculation ◽  
The Development Trend ◽  
Effective Water

coagulation and sedimentation method is an effective water treatment method, and the key factor is the choice of flocculant, according to its different chemical composition, it is generally divided into inorganic, organic, microbial flocculants. Because of the small dosage ,fast flocculation and less effect by external environment , organic polymeric flocculant has widely used in wastewater treatment. This paper describes some types of organic polymer flocculation and its research and application. finally,the development trend of organic polymeric flocculant was predicted.

Microbial Production of Schwertmannite: Development from Microbial Fundamentals to Marketable Products

2017 ◽  
Vol 262 ◽  
pp. 568-572 ◽  
Author(s):  
Susan Reichel ◽  
Eberhard Janneck ◽  
Diana Burghardt ◽  
Stefan Peiffer ◽  
Gunter Kießig ◽  
...  
Keyword(s):  
Mine Water ◽  
Ferrous Iron ◽  
Iron Hydroxide ◽  
Iron Oxidation ◽  
Research Work ◽  
Industrial Effluents ◽  
Open Pit ◽  
Organic Polymer ◽  
Water Treatment Process ◽  
Ferrous Iron Oxidation

Pumped groundwater in the lignite open-cast mines in Lusatia, Germany, contains a high level of ferrous iron (up to 1000 mg/L) at an initial pH of about 5. In recent R&D projects G.E.O.S. developed an innovative water treatment process for ferrous iron oxidation using the autochthonous microbial consortium in the mine water. The pilot plant is operated in the Nochten open-pit mine in cooperation with the LEAG and produces 5 – 10 t of schwertmannite per year. Extensive research work was carried out in parallel to utilize the produced schwertmannite. Pigment production proved to be technically feasible but difficult due to economic and market constraints. However, the high affinity of schwertmannite to oxy-anions provides the suitability for utilization as adsorbent to remove arsenate, antimonate, chromate, molybdate, vanadate or phosphate from mine water or industrial effluents. In the R&D project SURFTRAPII two kinds of filter-stable sorption materials were developed 1) by compacting schwertmannite or 2) by adhesive curing using an organic polymer, respectively. The produced filter-stable adsorbents were tested under technical conditions in cooperation with potential end users to remove arsenate, molybdate and phosphate from mine and industrial water and to concentrate valuable metals. The results showed a better performance of the material compared to other commercially available iron hydroxide adsorbents.

scholarly journals Synthetic organic polymer fouling in municipal wastewater reuse reverse osmosis

2014 ◽  
Vol 4 (3) ◽  
pp. 125-136 ◽  
Author(s):  
Y. Ekowati ◽  
M. Msuya ◽  
S. G. Salinas Rodriguez ◽  
G. Veenendaal ◽  
J. C. Schippers ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Water Reuse ◽  
Municipal Wastewater ◽  
Wastewater Reuse ◽  
Wastewater Sludge ◽  
Organic Polymer ◽  
Cationic Polymers ◽  
Initial State ◽  
Sem Images ◽  
Modified Fouling Index

A full scale waste water reuse plant suffered from irreversible fouling of the reverse osmosis (RO) membranes. The major suspect of fouling is cationic organic polymers applied in the wastewater sludge treatment. Thus, the purpose of this research is to study the effect of six cationic polymers, applied in the plant, on RO membrane performance. The filtration and adsorption experiments with 4 mg C/L polymer solutions were performed in laboratory RO set ups for 5–7 days. Scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy were used to analyze polymers. Fouling prediction was calculated with Modified Fouling Index-ultrafiltration (MFI-UF) constant flux values. A flux decline of 30–50% was observed after filtration experiments. In adsorption experiments, the resistance increased from 6 to 35%. The MFI-UF results showed the rate of fouling was around 1 bar/month. The base-acid cleaning was able to reduce the resistance of the fouled membrane with irreversible fouling resistance, 6–7%. SEM images showed that the fouling layer after cleaning did not appear in the membrane. The FTIR spectra of the membrane after cleaning were similar to virgin membrane. However, several adsorption peaks on the membrane after cleaning were not restored to the initial state.

Municipal wastewater sludge dewaterability and the presence of microbial extracellular polymer

2001 ◽  
Vol 44 (2-3) ◽  
pp. 373-379 ◽  
Author(s):  
J. J. Houghton ◽  
J. Quarmby ◽  
T. Stephenson
Keyword(s):  
Municipal Wastewater ◽  
Extraction Process ◽  
Wastewater Sludge ◽  
Optimum Level ◽  
Wastewater Treatment Process ◽  
Capillary Suction ◽  
Sludge Dewaterability ◽  
The Uk ◽  
The Relationship ◽  
Extracellular Polymer

Dewatering of sewage sludge is an essential and costly part of the wastewater treatment process. The presence of microbial extracellular polymer (ECP) is important for sludge flocculation, but ECP has also been shown to have a detrimental effect on the dewaterability of certain sludge types. This paper investigates the relationship between sludge dewaterability and the level of ECP present in a range of sludges obtained from 8 full-scale municipal treatment works in the UK. Sludge dewaterability was determined using the capillary suction time (CST) test, and a thermal extraction process followed by solvent precipitation was used for ECP extraction. The results indicate that for each type of sludge examined there appears to be an optimum level of ECP (raw sludge 20 mg ECP/g SS; activated sludge 35 mg ECP/g SS; digested sludge 10 mg ECP/g SS) at which the sludge should exhibit maximum dewaterability. The establishment of a trend between sludge dewaterability and the quantity of ECP present opens up the possibility of manipulating the level of microbial polymer present to aid sludge dewatering, and hence reduce plant operating costs.

Potential of Palm Oil Empty Fruit Bunch as Biogas Substrate

2019 ◽  
Vol 2 (1) ◽  
pp. 59-64
Author(s):  
Vincentius Vincentius ◽  
Evita H. Legowo ◽  
Irvan S. Kartawiria
Keyword(s):  
Palm Oil ◽  
Fermentation Process ◽  
Biogas Production ◽  
Wastewater Sludge ◽  
Empty Fruit Bunch ◽  
Alternative Source ◽  
The Earth ◽  
The One ◽  
Wet Fermentation ◽  
Water Ratio

Natural gas is a source of energy that comes from the earth which is depleting every day, an alternative source of energy is needed and one of the sources comes from biogas. There is an abundance of empty fruit bunch (EFB) that comes from palm oil plantation that can become a substrate for biogas production. A methodology of fermentation based on Verein Deutscher Ingenieure was used to utilize EFB as a substrate to produce biogas using biogas sludge and wastewater sludge as inoculum in wet fermentation process under mesophilic condition. Another optimization was done by adding a different water ratio to the inoculum mixture. In 20 days, an average of 6gr from 150gr of total EFB used in each sample was consumed by the microbes. The best result from 20 days of experiment with both biogas sludge and wastewater sludge as inoculum were the one added with 150gr of water that produced 2910ml and 2185ml of gas respectively. The highest CH 4 produced achieved from biogas sludge and wastewater sludge with an addition of 150gr of water to the inoculum were 27% and 22% CH 4 respectively. This shows that biogas sludge is better in term of volume of gas that is produced and CH percentage.

Effect of Illumination on Organic Polymer Thin-Film Transistors

2003 ◽  
Vol 771 ◽  
Author(s):  
Michael C. Hamilton ◽  
Sandrine Martin ◽  
Jerzy Kanicki
Keyword(s):  
Thin Film ◽  
Thin Film Transistors ◽  
Drain Current ◽  
Charge Carriers ◽  
Electrical Performance ◽  
Organic Polymer ◽  
Light Illumination ◽  
Polymer Thin Film ◽  
Channel Region ◽  
White Light Illumination

AbstractWe have investigated the effects of white-light illumination on the electrical performance of organic polymer thin-film transistors (OP-TFTs). The OFF-state drain current is significantly increased, while the drain current in the strong accumulation regime is relatively unaffected. At the same time, the threshold voltage is decreased and the subthreshold slope is increased, while the field-effect mobility of the charge carriers is not affected. The observed effects are explained in terms of the photogeneration of free charge carriers in the channel region due to the absorbed photons.

PENDEKATAN EKSPLORASI RESERVOIR ONSHORE MELALUI PEMETAAN REMBESAN MIKRO HIDROKARBON DENGAN CITRA HIPERSPEKTRAL

2019 ◽  
Vol 3 ◽  
pp. 1181
Author(s):  
Muhamad Iqbal Januadi Putra
Keyword(s):  
Ferrous Iron

Kapabilitas citra satelit hiperspektral yang memiliki keunggulan spektral sangat berpotensi untuk dimanfaatkan dalam eksplorasi keberadaan reservoir onshore. Kemampuan ini dilakukan melalui perekaman spektral fenomena rembesan mikro hidrokarbon yang menimbulkan ekspresi anomali spektral tanah dan menjadi kunci keberadaan sumber hidrokarbon. Dalam penelitian ini, Sub-Cekungan Jatibarang dipilih sebagai wilayah penelitian. Berdasarkan teori spektral rembesan mikro hidrokarbon, citra Hyperion dapat digunakan sebagai alat untuk mendeteksi keberadaan fenomena rembesan mikro hidrokarbon sebagai penduga keberadaan reservoir onshore karena memiliki spektrum panjang gelombang yang peka terhadap objek anomali hidrokarbon. Sehingga, penelitian ini bertujuan untuk mendeteksi area rembesan mikro hidrokarbon dengan citra Hyperion di Cekungan Jatibarang. Hydrocarbon Index (HI) yang memanfaatkan saluran 155 (1.699 nm), 158 (1.729 nm), dan 160 (1.749 nm) digunakan sebagai algoritma untuk medeteksi area rembesan mikro hidrokarbon di Sub-Cekungan Jatibarang. Gejala anomali alterasi kaolinite, ferrous iron dan gejala anomali vegetasi dengan indeks NDVI digunakan sebagai pembanding akurasi HI. Hasil penelitian ini menunjukkan adanya sebaran rembesan mikro hidrokarbon di wilayah Kecamatan Tukdana (Indramayu), Kecamatan Pasekan (Indramayu), dan Kecamatan Ligung (Majalengka). Area sebaran rembesan mikro hidrokarbon teraglomerasi pada wilayah pesisir utara Kecamatan Pasekan. Secara umum, keberadaan rembesan mikro hidrokarbon berkorelasi dengan tingkat anomali alterasi kaolinite, ferrous iron, dan anomali vegetasi.

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