Anaerobic Treatment of Pulp Mill Effluents

1991 ◽  
Vol 24 (7) ◽  
pp. 203-206 ◽  
Author(s):  
M. K. Korczak ◽  
S. Koziarski ◽  
B. Komorowska
Keyword(s):  
Acid Hydrolysis ◽  
Pulp Mill ◽  
Cellulose Fibers ◽  
Anaerobic Treatment ◽  
High Molecular Mass ◽  
Cod Removal ◽  
Cellulose Production ◽  
Methane Generation ◽  
Pulp Mill Effluents ◽  
Hydrolysis Of

A laboratory-scale study on the anaerobic treatment of selected pulp mill streams was carried out in a collaboration between the Research Institute for Environmental Protection and Designing Office of Water and Waste Disposal. Anaerobic treatment of effluents from acid hydrolysis of wood from sulfate cellulose production, and effluents from the sulfite cellulose fibers washing was investigated. The results indicated 80% COD removal and the average methane generation was found to be 340 Ncm3/gCOD removed in case of highly polluted (COD = 63 kgO2/m3) acid hydrolysis effluents. The waste from cellulose washing contained, beside sugars, alsorefractory compounds, such as high-molecular-mass lignin derivatives, resins and tannins. According to that, only 20-30% COD removal was obtained and the methane generation was 270-360 Ncm3/g COD removed.

scholarly journals Zhurkov’s Stress-Driven Fracture as a Driving Force of the Microcrystalline Cellulose Formation

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2952
Author(s):  
Sergey V. Stovbun ◽  
Mariya G. Mikhaleva ◽  
Aleksey A. Skoblin ◽  
Sergey V. Usachev ◽  
Sergey N. Nikolsky ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Microcrystalline Cellulose ◽  
Driving Force ◽  
Food Industry ◽  
Thermal Destruction ◽  
Chemical Conversion ◽  
Cellulose Fibers ◽  
Point Of View ◽  
Pure Product ◽  
Hydrolysis Of

Microcrystalline cellulose (MCC) is a chemically pure product of cellulose mechano-chemical conversion. It is a white powder composed of the short fragments of the plant cells widely used in the modern food industry and pharmaceutics. The acid hydrolysis of the bleached lignin-free cellulose raw is the main and necessary stage of MCC production. For this reason, the acid hydrolysis is generally accepted to be the driving force of the fragmentation of the initial cellulose fibers into MCC particles. However, the low sensibility of the MCC properties to repeating the hydrolysis forces doubting this point of view. The sharp, cleave-looking edges of the MCC particles suggesting the initial cellulose fibers were fractured; hence the hydrolysis made them brittle. Zhurkov showed that mechanical stress decreases the activation energy of the polymer fracture, which correlates with the elevated enthalpy of the MCC thermal destruction compared to the initial cellulose.

Heterogeneous Acid Hydrolysis of Native Cellulose Fibers

1956 ◽  
Vol 48 (7) ◽  
pp. 1183-1189 ◽  
Author(s):  
E. A. Immergut ◽  
B. G. Rånby
Keyword(s):  
Acid Hydrolysis ◽  
Cellulose Fibers ◽  
Native Cellulose ◽  
Hydrolysis Of

Anaerobic Fermentation of Sulphite Pulp Mill Effluents

1985 ◽  
Vol 17 (1) ◽  
pp. 157-171 ◽  
Author(s):  
A Geller ◽  
L Göttsching
Keyword(s):  
Residence Time ◽  
Anaerobic Fermentation ◽  
Fixed Bed ◽  
Pulp Mill ◽  
Cod Removal ◽  
Fixed Bed Reactor ◽  
Pulp Mills ◽  
Pulp Mill Effluents ◽  
Spent Liquor ◽  
Better Than

Despite internal measures modern sulphite pulp mills are still releasing considerable amounts of effluents loaded with organic pollutants. The main sources are the spent liquor evaporator and the bleach plant. In the laboratory scale two anaerobic systems (stirred fermentation vessel and fixed bed reactor) were tested for the fermentation of effluents from a magnesium sulphite mill. The efficiency of the fixed bed reactor was substantially better than the efficiency of the fermentor. Upon treatment of evaporator condensates, COD removal exceeded 90 % with corresponding BOD removal of 99 % after a residence time of 36 hours, whereas the necessary residence time for the same results was about 16 days in the fermentor. The methane production increased with increasing loading, reaching a maximum at a COD loading rate of 7 kg.m−3 .d−1. BOD elimination from bleaching effluents was better than 95 % with fixed bed reactor, whilst COD removal remained below 50 %. All experiments were run over a period of more than two years, exhibiting stability of the fixed bed filter, low needs for maintenance and negligible biomass generation.

Anaerobic Treatment of Sulfite Pulp Mill Effluents

1985 ◽  
Vol 17 (1) ◽  
pp. 145-156 ◽  
Author(s):  
H Kroiss ◽  
K Svardal ◽  
H Fleckseder
Keyword(s):  
Investment Decision ◽  
Waste Water Treatment ◽  
Pulp Mill ◽  
Anaerobic Treatment ◽  
Foreseeable Future ◽  
Start Up ◽  
Solids Retention ◽  
Sulfite Pulp ◽  
Pulp Mill Effluents ◽  
Extraction Stage

Sulfite pulping will still play an important role in Austria in the foreseeable future. Therefore, efficient and economic means of waste-water treatment have to be searched for. The experience gained with operating laboratory scale and semi-technical scale experiments for anaerobic treatment of condensates and the extraction stage effluent from two mills is presented. As we foresee, in full scale conditions a series of problems arise (neutralization, solids retention, SO2 toxicity, start-up of process) The advantage of the anaerobic process in terms of energy alone cannot, as we had to realize, be the single basis of the investment decision.

scholarly journals FUNCTIONAL MATERIALS FROM PAPER WASTES. I. FROM WASTE NEWSPRINT PAPER AND CARDBOARD TO HIGH-GRADE CELLULOSE FIBERS

2018 ◽  
pp. 27-35
Author(s):  
Александра (Aleksandra) Михайловна (Mikhailovna) Михаилиди (Mikhailidi) ◽  
Вадим (Vadim) Иванович (Ivanovich) Маркин (Markin) ◽  
Нина (Nina) Ефимовна (Efimovna) Котельникова (Kotel'nikova) ◽  
Shahriar Karim Saurov
Keyword(s):  
Methylene Blue ◽  
Acid Hydrolysis ◽  
Alkali Treatment ◽  
Functional Materials ◽  
Renewable Resource ◽  
Cellulose Fibers ◽  
High Grade ◽  
Cellulose I ◽  
Powder Cellulose ◽  
Hydrolysis Of

Utilization of paper wastes as renewable resource of lignocellulosic constituents has the opportunity to promote a cleaner environment and to prepare valuable materials. This paper describes our study on an isolation of low-fiber powder cellulose from two grades of wastes as feedstocks: waste newsprint paper and cardboard wrapper through recycling including a thermal defibration, an alkali treatment with a solution of NaOH with a concentration from 0.03 to 1.00 М, a bleaching with a solution of Н2О2 with a concentration from 0.8 to 2.6 М followed with an acid hydrolysis of the pretreated species with a solution of HNO3 of 1.5 and 3.0 M. An impact of the pretreatment on sizes of fibers was evaluated with a stereoscopic microscopy. The powder celluloses obtained as a result of the acid hydrolysis exhibited the structure of cellulose I revealed with a WAXS method and were of a high-grade purity, according to EDXA. Sorption capacities of the powder celluloses from the waste cardboard and newsprint towards a dye methylene blue were 6.67 mg∙g-1 and 8.75 mg∙g-1 correspondingly.

Reduction of Pulp and Paper Industry Effluent Loading

1986 ◽  
Vol 18 (3) ◽  
pp. 109-125 ◽  
Author(s):  
A. Luonsi ◽  
P. Vuoriranta ◽  
P. Hynninen
Keyword(s):  
Paper Industry ◽  
Pulp Mill ◽  
Pulp And Paper Industry ◽  
Anaerobic Treatment ◽  
Pulp And Paper ◽  
Production Water ◽  
Lower Volume ◽  
Water Recirculation ◽  
Pulp Mill Effluents ◽  
Industry Effluent

The pulp and paper industry consumes large volumes of water i.e. 10-300 m3/t of product. The most important measure in reducing the pollution charge is a reduction in water consumption. Thereafter, efficient and more easily controllable methods can be used for the treatment of lower volume, more concentrated and warmer wastewaters. Application of medium consistency techniques in production, water recirculation, and more efficient use of wood are pushing development in this direction. It is clear however, that these development trends will undergo certain practical limitations governed by the actual production process. The trends in production favour the utilization of anaerobic techniques in wastewater treatment. Both the purification efficiency and the economy of the treatment system can be improved as seen from the examples in this paper. However, the conventional aerobic treatment is under continuous development and it will be applied as a completing stage of anaerobic treatment. Modifications of the activated sludge process can be applied especially for rather dilute composite pulp mill effluents as presented in this paper.

scholarly journals Mild Acid Hydrolysis of Rice Straw for Highly Efficient Methane Generation with Hydrolysates

BioResources ◽  
2018 ◽  
Vol 13 (4) ◽  
Author(s):  
Dianlong Wang ◽  
Hao Shi ◽  
Ya Xin ◽  
Yanlin Zhang ◽  
Ping Ai ◽  
...  
Keyword(s):  
Acid Hydrolysis ◽  
Rice Straw ◽  
Mild Acid Hydrolysis ◽  
Methane Generation ◽  
Highly Efficient ◽  
Hydrolysis Of ◽  
Mild Acid
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