Influence of process water quality on hydrothermal carbonization of cellulose

2014 ◽  
Vol 154 ◽  
pp. 229-239 ◽  
Author(s):  
Xiaowei Lu ◽  
Joseph R.V. Flora ◽  
Nicole D. Berge
Keyword(s):  
Water Quality ◽  
Hydrothermal Carbonization ◽  
Process Water

DIP quality influenced by process water quality

TAPPI Journal ◽  
2014 ◽  
Vol 13 (9) ◽  
pp. 51-60
Author(s):  
DENNIS VOSS ◽  
HANS-JOACHIM PUTZ ◽  
SAMUEL SCHABEL
Keyword(s):  
Water Quality ◽  
Surface Tension ◽  
Ph Value ◽  
Water Hardness ◽  
Process Water ◽  
Test Results ◽  
Negative Effects ◽  
Water Parameters ◽  
Effects Of Ph ◽  
Contamination Levels

The need for deinking mills to reduce their fresh water consumption has resulted in higher loads of various contaminants in the process water. Lower recovered paper quality also leads to higher contamination levels in the mills. This higher load has an influence on achievable target brightness. The objective of the work was to determine and explain the main reasons for relatively poor deinked pulp quality or poor deinking potential based on the influence of recovered paper composition and process water quality. The process water parameters significantly affect the deinking potential of recovered paper. The test results showed the negative effects of increased water hardness. For standard recovered paper mixtures, flotation selectivity is higher with increasing flotation pH-value. Good results were realized for standard recovered paper with low hardness, low surface tension, and high pH-value. The results for recovered paper containing flexo newsprint could be slightly improved with low hardness, low surface tension, and low pH-value. The results of the test program using design of experiments showed interacting effects of pH-value and surface tension on luminosity and flotation selectivity.

Thermal behavior of hydrochar from co-hydrothermal carbonization of swine manure and sawdust: effect of process water recirculation

2019 ◽  
Vol 3 (9) ◽  
pp. 2329-2336 ◽  
Author(s):  
Qianqian Lang ◽  
Hainan Luo ◽  
Yi Li ◽  
Dong Li ◽  
Zhengang Liu ◽  
...  
Keyword(s):  
Thermal Behavior ◽  
Swine Manure ◽  
Hydrothermal Carbonization ◽  
Process Water ◽  
Combustion Behavior ◽  
Water Recirculation

Process water recirculation during co-HTC of swine manure and sawdust changed the combustion behavior of hydrochar.

Wet oxidation of process water from hydrothermal carbonization of biomass with nitrate as oxidant

2018 ◽  
Vol 339 ◽  
pp. 1-6 ◽  
Author(s):  
Patrizia Stutzenstein ◽  
Barbara Weiner ◽  
Robert Köhler ◽  
Christoph Pfeifer ◽  
Frank-Dieter Kopinke
Keyword(s):  
Hydrothermal Carbonization ◽  
Process Water ◽  
Wet Oxidation

Process Water from the Hydrothermal Carbonization of Biomass: A Waste or a Valuable Product?

2017 ◽  
Vol 9 (7) ◽  
pp. 1181-1189 ◽  
Author(s):  
Harpreet Singh Kambo ◽  
Jamie Minaret ◽  
Animesh Dutta
Keyword(s):  
Hydrothermal Carbonization ◽  
Process Water ◽  
Valuable Product

scholarly journals Challenges in the Assessment of Mining Process Water Quality

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 940
Author(s):  
Thi Minh Khanh Le ◽  
Hanna Miettinen ◽  
Malin Bomberg ◽  
Nóra Schreithofer ◽  
Olli Dahl
Keyword(s):  
Water Quality ◽  
Water Quality Assessment ◽  
Poor Quality ◽  
Sulfur Compounds ◽  
Plant Performance ◽  
Process Water ◽  
Water Matrix ◽  
Processing Plants ◽  
Mine Sites ◽  
Mining Water

The changes in water quality owing to recirculation of water in mineral processing plants can compromise the plant performance as well as maintenance needs. Therefore, mining process water quality assessment is becoming critical. Nevertheless, very few studies have investigated the suitability of the current analysis methodology practiced in certified laboratories for evaluating mining process water quality. This article presents two case studies to highlight the major issues encountered when performing sampling for physicochemical and chemical parameters in process water at two European mine sites using procedures from two certified laboratories. In addition, microorganisms were shown to be abundant in process waters and likely affect the mining water chemistries. However, the protocols used for microbial studies are not optimal for mining process samples, and need to be improved. The results showed difficulties in providing satisfactory results when analyzing control samples. Additionally, the analysis results presented a strong imbalance in TDS and sulfur compounds. Several potential causes associated with the poor quality of the analysis results have been outlined with a specific focus on the preservation methods. A literature review on the degradation of thiosalts suggested that the current preservation procedures are not suitable for preserving sulfur compounds. Moreover, the results indicated that the water matrix strongly influenced the validity of the chosen analysis method. In conclusion, the analysis methods should be customized for the different mining water matrix types in order to ensure the accuracy and reproducibility of the results.

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