scholarly journals Zero-Liquid Discharge Treatment of Wastewater from a Fertilizer Factory

2020 ◽  
Vol 12 (1) ◽  
pp. 397
Author(s):  
Svetlana B. Zueva ◽  
Francesco Ferella ◽  
Giuliana Taglieri ◽  
Ida De Michelis ◽  
Inna Pugacheva ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Central Italy ◽  
Hydrated Lime ◽  
Fertilizer Plant ◽  
Discharge Treatment ◽  
A Value ◽  
Liquid Discharge ◽  
Fluoride Separation ◽  
Plant Process

This article describes the improvement of wastewater treatment in a fertilizer plant located in Central Italy (municipality of Vasto). In this facility, water is used for the removal of dust and fluorinated gases from the air. The resulting wastewater contains fluorides and phosphates in hazardous forms. Its treatment ordinarily does not result in a Zero-Liquid Discharge (ZLD) process. To achieve this purpose, several reagents were tested, focusing on the correlation linking pH, type of reagent and the effect on the separation of fluorides and phosphates from the wastewater. It was eventually found, and explained with a model, that hydrated lime at pH = 12 was so effective as a precipitating agent that phosphate and fluoride separation reached a value of 99.9%, thus allowing for reuse of the water in the plant process. Furthermore, phosphates and fluorides precipitated in a non-hazardous form, so that the material could also be recycled. In synthesis, wastewater treatment of the fertilizer plant was upgraded so that it became a ZLD process coupled with the recovery and recycling of fluorides and phosphates.

scholarly journals Sustainable Improvement of Zeolitic Pyroclastic Soils for the Preservation of Historical Sites

2020 ◽  
Vol 10 (3) ◽  
pp. 899
Author(s):  
Manuela Cecconi ◽  
Costanza Cambi ◽  
Stefano Carrisi ◽  
Dimitri Deneele ◽  
Enza Vitale ◽  
...  
Keyword(s):  
Central Italy ◽  
Hydrated Lime ◽  
Thermo Gravimetric ◽  
X Ray ◽  
Beneficial Effects ◽  
Multi Scale ◽  
Sustainable Improvement ◽  
Calcium Silicate Hydrates ◽  
Historical Sites ◽  
Oedometer Tests

Climate changes are inducing a modification of environmental loads on historical sites, requiring new actions towards their conservation. In the paper, the results of an experimental work on sustainable improvement of a pyroclastic soil belonging to the Orvieto cliff (Central Italy) have been investigated in the perspective of its preservation from degradation. The slightly coherent facies of Orvieto Ignimbrite (pozzolana) was treated with hydrated lime and the subsequent chemo-physical evolution was investigated by means of a multi-scale analysis. The beneficial effects obtained from the improvement in terms of mechanical behaviour were interpreted and correlated to the chemo-physical evolution of the system. Microstructural analyses, X-ray diffractometry, thermo-gravimetric analyses (DTG), SEM observations, mercury intrusion porosimetry performed on raw and treated samples, showed that the pozzolanic reactions develop since the very beginning in the system and that the observed mechanical improvement of the treated soil is mainly due to the formation of calcium silicate hydrates (CSH) and calcium aluminate hydrates (CAH). In the paper, the mechanical improvement is put in evidence by comparing the results of oedometer tests performed on both raw and treated samples.

Incorporating sulfur reactions and interactions with iron and phosphorus into a general plant-wide model

2018 ◽  
Vol 79 (1) ◽  
pp. 26-34 ◽  
Author(s):  
Hélène Hauduc ◽  
Tanush Wadhawan ◽  
Bruce Johnson ◽  
Charles Bott ◽  
Matthew Ward ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Optimization Design ◽  
Oxygen Demand ◽  
Phosphorus Release ◽  
Sulfur Cycle ◽  
Precipitate Formation ◽  
Treatment Processes ◽  
Whole Plant ◽  
Plant Process ◽  
P Removal

Abstract Sulfur causes many adverse effects in wastewater treatment and sewer collection systems, such as corrosion, odours, increased oxygen demand, and precipitate formation. Several of these are often controlled by chemical addition, which will impact the subsequent wastewater treatment processes. Furthermore, the iron reactions, resulting from coagulant addition for chemical P removal, interact with the sulfur cycle, particularly in the digester with precipitate formation and phosphorus release. Despite its importance, there is no integrated sulfur and iron model for whole plant process optimization/design that could be readily used in practice. After a detailed literature review of chemical and biokinetic sulfur and iron reactions, a plant-wide model is upgraded with relevant reactions to predict the sulfur cycle and iron cycle in sewer collection systems, wastewater and sludge treatment. The developed model is applied on different case studies.

Industrial Wastewater Treatment Using Solar Still for Achieving Zero Liquid Discharge

2019 ◽  
pp. 233-238
Author(s):  
V. Kiruba Devi ◽  
S. S. Nandhini Priya ◽  
M. Shivasankari ◽  
A. Murugaiyan ◽  
H. Saarathy ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Industrial Wastewater ◽  
Solar Still ◽  
Industrial Wastewater Treatment ◽  
Liquid Discharge

Occurrence of Class 1 and 2 Integrons in Resistant Enterobacteriaceae Collected from a Urban Wastewater Treatment Plant: First Report from Central Italy

2011 ◽  
Vol 17 (2) ◽  
pp. 229-234 ◽  
Author(s):  
Cristina Pellegrini ◽  
Giuseppe Celenza ◽  
Bernardetta Segatore ◽  
Pierangelo Bellio ◽  
Domenico Setacci ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Central Italy ◽  
Treatment Plant ◽  
Urban Wastewater ◽  
First Report ◽  
Class 1 ◽  
Urban Wastewater Treatment

scholarly journals TEKNOLOGI PENGELOLAAN LIMBAH CAIR YANG IDEAL UNTUK PABRIK KELAPA SAWIT

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Petrus Nugro Rahardjo
Keyword(s):  
Wastewater Treatment ◽  
Research Result ◽  
Treatment Plant ◽  
Good Alternative ◽  
Quality Standard ◽  
Crude Palm Oil ◽  
Treatment Technology ◽  
Surface Water Pollution ◽  
A Value ◽  
Accelerated Growth

The number of crude palm oil factory (CPOF) in Indonesia has already increased rapidly in the last fifteen years. In the same period, expansion of the palm plantation has also been continuing and growing, but unfortunately the accelerated growth is not same as the development of the wastewater treatment technology and its proper applications. Many CPOF in Indonesia have not a good wastewater treatment plant (WWTP). In fact they cause terribly environmental problems, especially related to surface water pollution. BOD content in the effluent of most CPOF is between 35,000 to 46,000 ppm and in the effluent of their WWTP it is much more than 100 ppm. Therefore it needs to propose a treatment system which can guarantee to reduce all pollutants till a value matching with the environmental quality standard. Based on the research result assessed by BPPT, an ideal WWTP suitable for CPOF is promoted to be considered as one very good alternative which is better applied for all CPOF in Indonesia. The stages and processes are showed in the second  figure. Key words : Ideal treatment, CPOF wastewater

scholarly journals CONTINUOUS PIGGERY WASTEWATER TREATMENT WITH ANAEROBIC BAFFLED REACTOR (ABR) BY BIO-ACTIVATOR EFFECTIVE MICROORGANISMS (EM4)

2019 ◽  
Vol 3 (1) ◽  
pp. 1
Author(s):  
I Wayan Koko Suryawan ◽  
Gita Prajati ◽  
Anshah Silmi Afifah ◽  
Muhammad Rizki Apritama ◽  
Yosef Adicita
Keyword(s):  
Wastewater Treatment ◽  
Water Reuse ◽  
Hydraulic Retention Time ◽  
Biomass Growth ◽  
Piggery Wastewater ◽  
Effective Microorganisms ◽  
Gas Formation ◽  
A Value ◽  
Yield Value ◽  
Startup Process

<p><strong>Aims: </strong>This study was aimed to determine the efficiency and characteristics of the pig wastewater treatment using ABR with the addition of effective microorganism4 (EM4) as bio-activator during the startup process (R1) and without EM4 (R2). <strong>Methodology and results: </strong>Piggery wastewater is poured into ABR with 12 hours HRT (hydraulic retention time) and reduced to 6 hours after the concentration in ABR is stable. COD removal efficiency when 12 hours HRT reach 60% (R1), and 51% (R2). The results did not change significantly, when 6 hours HRT COD efficiency were 57.8% (R1) and 51.3% (R2). The biomass growth rate at R1 is faster than R2 with Food to Microorganism ratio (F/M) 0.4-0.89 (R1) and 0.68-1.38 (R2). The yield value of methane gas formation in the study showed a value of 0.25-0.28 L-CH4/g-COD removed. <strong>Conclusion, significance and impact study:</strong> Advanced wastewater treatment is needed to improve effluent’s quality for water reuse from piggery wastewater. The addition of EM4 can improve the COD efficiency removal and biomass growth.<strong></strong></p>

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