Pilot-scale hybrid system combining hydrodynamic cavitation and sedimentation for the decolorization of industrial inks and printing ink wastewater

Abstract This study investigated the performance of a hybrid membrane filtration system to produce industrial water from highly-colored surface water. The system consists of a membrane filtration process with appropriate pretreatments, including coagulation, pre-chlorination, and anion exchange (IE) process. The results of the pilot-scale experiments revealed that the hybrid system can produce treated water with color of around 5 Pt-Co, dissolved manganese concentration of no more than 0.05 mg/L, and a silt density index (SDI) of no more than 5 when sufficient coagulant and sodium hypochlorite were dosed. Although the IE process effectively reduced the color of the water, a moderate increase in the color of the IE effluent was observed when there was a significant increase in the color of the raw water. This resulted in a severe membrane fouling, which was likely to be attributed to the excess production of inorganic sludge associated with the increased coagulant dosage required to achieve sufficient reduction of color. Such severe membrane fouling can be controlled by optimising the backwashing and relaxation frequencies during the membrane filtration. These results indicate that the hybrid system proposed is a suitable technology for treating highly-colored surface water.

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Effects of Thickened Excess Sludge Pre-Treatment Using Hydrodynamic Cavitation for Anaerobic Digestion

Energies ◽

10.3390/en13102483 ◽

2020 ◽

Vol 13 (10) ◽

pp. 2483 ◽

Cited By ~ 1

Author(s):

Agnieszka Garlicka ◽

Monika Zubrowska-Sudol ◽

Katarzyna Umiejewska ◽

Otton Roubinek ◽

Jacek Palige ◽

...

Keyword(s):

Methane Production ◽

Pilot Scale ◽

Hydrodynamic Cavitation ◽

Excess Sludge ◽

Maximum Increase ◽

Primary Sludge ◽

Sludge Flocs ◽

Pre Treatment ◽

Flocculation Process ◽

Different Levels

The main purpose of this study was the assessment of the possibility of increasing the production of biogas through the pre-treatment of thickened excess sludge (TES) by means of the hydrodynamic cavitation (HC) conducted at different levels of energy density (EL) i.e., 70, 140 and 210 kJ/L. The experiments were performed on a pilot scale, and a mixture of thickened primary sludge (TPS) and TES was used as digester feed. The results documented that an important parameter determining the possibility of obtaining an enhanced methane production is the value of energy input in the HC process. This parameter determines the changes occurring in sludge as a result of disintegration (i.e., sludge floc deagglomeration, lysis of cells, re-flocculation process and the related release of compounds susceptible to biodegradation from sludge flocs). The maximum increase in methane yield (MY) of 152% was obtained for EL = 140 kJ/L. In this case, HC mainly caused sludge floc deagglomeration. An increase in MY was also recorded when TES was subject to the disintegration process at EL = 210 kJ/L. However, it was 4.3 times lower than that observed for EL = 140 kJ/L. Pre-treatment of TES at EL = 70 kJ/L did not contribute to an increase in methane production.

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Pilot scale intensification of rubber seed ( Hevea brasiliensis ) oil via chemical interesterification using hydrodynamic cavitation technology

Bioresource Technology ◽

10.1016/j.biortech.2017.03.046 ◽

2017 ◽

Vol 242 ◽

pp. 272-282 ◽

Cited By ~ 12

Author(s):

Awais Bokhari ◽

Suzana Yusup ◽

Lai Fatt Chuah ◽

Jiří Jaromír Klemeš ◽

Saira Asif ◽

...

Keyword(s):

Hevea Brasiliensis ◽

Pilot Scale ◽

Hydrodynamic Cavitation ◽

Chemical Interesterification ◽

Rubber Seed

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Biosolids Conditioning With Hydrodynamic Cavitation Part II: an Extended Pilot Scale Evaluation

Proceedings of the Water Environment Federation ◽

10.2175/193864711802863328 ◽

2011 ◽

Vol 2011 (4) ◽

pp. 154-169

Author(s):

David Nicholas ◽

Philip Vella ◽

Christophe Desmottes ◽

Sunil Mehta

Keyword(s):

Pilot Scale ◽

Hydrodynamic Cavitation ◽

Scale Evaluation

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Pilot-Scale Investigation of Forward/Reverse Osmosis Hybrid System for Seawater Desalination Using Impaired Water from Steel Industry

International Journal of Chemical Engineering ◽

10.1155/2016/8745943 ◽

2016 ◽

Vol 2016 ◽

pp. 1-9 ◽

Cited By ~ 6

Author(s):

Hanaa M. Ali ◽

Hanaa Gadallah ◽

Sahar S. Ali ◽

Rania Sabry ◽

A. G. Gadallah

Keyword(s):

Reverse Osmosis ◽

Hybrid System ◽

Membrane Fouling ◽

Steel Industry ◽

Water Flux ◽

Operating Time ◽

Pilot Scale ◽

Operating Conditions ◽

Hybrid Process ◽

Impaired Water

This paper was focused on the investigation of a forward osmosis- (FO-) reverse osmosis (RO) hybrid process to cotreat seawater and impaired water from steel industry. By using this hybrid process, seawater can be diluted before desalination, hence reducing the energy cost of desalination, and simultaneously contaminants present in the impaired water are prevented from migrating into the product water through the FO and RO membranes. The main objective of this work was to investigate on pilot-scale system the performance of the combined FO pretreatment and RO desalination hybrid system and specifically its effects on membrane fouling and overall solute rejection. Firstly, optimization of the pilot-scale FO process to obtain the most suitable and stable operating conditions for practical application was investigated. Secondly, pilot-scale RO process performance as a posttreatment to FO process was evaluated in terms of water flux and rejection. The results indicated that the salinity of seawater reduced from 35000 to 13000 mg/L after 3 hrs using FO system, while after 6 hrs it approached 10000 mg/L. Finally, FO/RO system was tested on continuous operation for 15 hrs and it was demonstrated that no pollutant was detected neither in draw solution nor in RO permeate after the end of operating time.

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