Process Internal Measures to Reduce Pulp Mill Pollution Load

1991 ◽  
Vol 24 (3-4) ◽  
pp. 45-53 ◽  
Author(s):  
Johan Gullichsen
Keyword(s):  
Production Cost ◽  
Pollution Abatement ◽  
Pulp Mill ◽  
Process Variations ◽  
Effluent Treatment ◽  
Pollution Potential ◽  
Pollution Load ◽  
New Process ◽  
The Status ◽  
Internal Pollution

There are several options to modify present pulping processes towards reduced environmental impact. The industry is readily adopting those that have reached the status of proven technology. New process variations are being developed. Process internal measures alone will not be sufficient to reach acceptable, levels. External effluent treatment will always be required. Internal abatement measures should concentrate on reducing pollution potential at the very source but also on improving the conditions for efficient external treatment. The overall production cost will increase when applying internal pollution abatement options. The marginal addition is however small.

The Onset of Lignin-Modifying Enzymes, Decrease of AOX and Color Removal by White-Rot Fungi Grown on Bleach Plant Effluents

1991 ◽  
Vol 24 (3-4) ◽  
pp. 189-198 ◽  
Author(s):  
V. P. Lankinen ◽  
M. M. Inkeröinen ◽  
J. Pellinen ◽  
A. I. Hatakka
Keyword(s):  
Lignin Peroxidase ◽  
Active Form ◽  
White Rot Fungi ◽  
Pulp Mill ◽  
Color Removal ◽  
Effluent Treatment ◽  
White Rot ◽  
White Rot Fungus ◽  
Lignin Peroxidases ◽  
Pulp Mill Effluents

Decrease of adsorbable organic chlorine (AOX) is becoming the most important criterion for the efficiency of pulp mill effluent treatment in the 1990s. Two methods, designated MYCOR and MYCOPOR which utilize the white-rot fungus Phanerochaete chrysosporium have earlier been developed for the color removal of pulp mill effluents, but the processes have also a capacity to decrease the amount of chlorinated organic compounds. Lignin peroxidases (ligninases) produced by P. chrvsosporium may dechlorinate chlorinated phenols. In this work possibilities to use selected white-rot fungi in the treatment of E1-stage bleach plant effluent were studied. Phlebia radiata. Phanerochaete chrvsosporium and Merulius (Phlebia) tremellosus were compared in shake flasks for their ability to produce laccase, lignin peroxidase(s) and manganese-dependent peroxidase(s) and to remove color from a medium containing effluent. Softwood bleaching effluents were treated by carrier-immobilized P. radiata in 2 1 bioreactors and a 10 1 BiostatR -fermentor. Dechlorination was followed using Cl ion and AOX determinations. All fungi removed the color of the effluent. In P. radiata cultivations AOX decrease was ca. 4 mg l−1 in one day. Apparent lignin peroxidase activities as determined by veratryl alcohol oxidation method were negligible or zero in a medium with AOX content of ca. 60 mg l−1, prepared using about 20 % (v/v) of softwood effluent. However, the purification of extracellular enzymes implied that large amounts of lignin peroxidases were present in the medium and, after the purification, in active form. Enzyme proteins were separated using anion exchange chromatography, and they were further characterized by electrophoresis (SDS-PAGE) to reveal the kind of enzymes that were present during AOX decrease and color removal. The most characteristic lignin peroxidase isoenzymes in effluent media were LiP2 and LiP3.

Biosludge Incineration in a Recovery Boiler

1999 ◽  
Vol 40 (11-12) ◽  
pp. 195-200 ◽  
Author(s):  
P. Harila ◽  
V.-A. Kivilinna
Keyword(s):  
Black Liquor ◽  
Pulp Mill ◽  
Effluent Treatment ◽  
Attractive Alternative ◽  
Net Energy ◽  
High Moisture ◽  
Primary Sludge ◽  
Start Up ◽  
Combustion Emissions ◽  
Recovery Boiler

An activated sludge process is an effective tool against effluent emissions in a pulp mill. It has only a few features which can be regarded deficiences. One of them is that effluent treatment of a modern pulp mill creates some 10-20 tonnes dry solids of biosludge per day. This sludge is difficult to burn due to its high moisture content. The most common way is to mix biosludge with primary sludge, to dewater the mixture in presses and finally to burn it in a solid fuel boiler. This type of sludge treatment incurs rather high costs and does not produce any net energy. Also combustion emissions vary depending on the boiler type. The Metsä-Botnia Kemi Pulp Mill was the first mill in the world to burn biosludge in a recovery boiler. The system start-up was in 1993 and it has been in operation ever since. Mechanically dewatered biosludge is mixed with weak black liquor and concentrated in a conventional evaporation plant equipped with a pressurized superconcentrator unit. In a modern recovery boiler, firing conditions are well controlled and monitored. Better emission control than in most bark fired boilers is achieved. Accumulation of nonprocess elements, corrosion, plugging, scaling and some other operational problems were expected. A lot of experience has been gathered during the years of operation and reviewed in this presentation. The achieved benefits of the system are discussed. Disposal of biosludge in a recovery boiler offers an economically and environmentally attractive alternative. Probably the best evidence from this is the fact that Metsä-Botnia has applied the same process solution in the recent reconstruction of the recovery departments at the Jouteno Mill.

Purification of pulp mill condensates by an adsorptive process on activated carbon

Holzforschung ◽  
2019 ◽  
Vol 73 (6) ◽  
pp. 589-597 ◽  
Author(s):  
José A.F. Gamelas ◽  
Sofia M. Rebola ◽  
Margarita G. Evtyugina ◽  
Valdemar I. Esteves ◽  
Dmitry V. Evtuguin
Keyword(s):  
Activated Carbon ◽  
Volatile Compounds ◽  
Water Cycle ◽  
Black Liquor ◽  
Pulp Mill ◽  
Dimethyl Disulfide ◽  
Pulp Mills ◽  
Wide Range ◽  
New Process ◽  
Pseudo Second Order

Abstract In order to close the water cycle in pulp mills with condensates instead of fresh water, the malodorous/hazardous volatile compounds and colored substances have to be removed by appropriate efficient methods. In the present work, the condensate from the evaporation of black liquor (BL) from a kraft mill was purified by a batch adsorptive process by means of commercial activated carbon (AC). The effluent was found to contain a wide range of aromatic and organosulfur volatile compounds, including toluene, ethylguaicol, syringaldehyde, dimethyl disulfide (DMDS), dimethyl trisulfide (DMTS), 2,3-dimethylthiophene, benzothiol and benzothiophene derivatives. Methanol was the major volatile organic component in the condensate (201 mg l−1), which was, however, poorly adsorbed on the AC surface. Aromatics and organosulfur contaminants were adsorbed almost completely in 2–5 min at 23°C under the optimized AC load (900 mg l−1). The treatment allowed the elimination of up to 99% of the obnoxious odor, color and turbidity of the condensate. The adsorption equilibrium followed the Langmuir model and the pseudo-second-order kinetics. The new process could be incorporated in the pulp mill with relatively low additional reagent costs.

A construction for multi-modal processes, and a potential memory device

1990 ◽  
Vol 27 (01) ◽  
pp. 146-155 ◽  
Author(s):  
P. Whittle
Keyword(s):  
Equilibrium Distribution ◽  
State Dependence ◽  
Memory Device ◽  
Transition Intensity ◽  
Current State ◽  
New Process ◽  
The Status ◽  
Transition Rules ◽  
Extra State ◽  
Parameter Values

It is shown that if parameters occurring linearly in the transition intensity of a Markov process are replaced by their respective ‘Bayesian estimates' then the new process thus generated has an equilibrium distribution which is a mixture (over parameter values) of the original parametrised equilibrium distribution. One effectively then has an extra state dependence in that one selects from a given class of transition rules those rules which are most consistent with the value of current state. The effect of this is thus to preserve the status quo, in that unlikely transitions are made even less likely. By this means one can construct processes which show several distinct and metastable modes of behaviour, and which can serve as models for memory devices.

Pulp Mill Effluent Treatment by Fenton-Type Reactions Catalyzed by Iron Complexes

1999 ◽  
Vol 40 (11-12) ◽  
pp. 351-355 ◽  
Author(s):  
Jaime Rodríguez ◽  
David Contreras ◽  
Carolina Parra ◽  
Juanita Freer ◽  
Jaime Baeza ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Aqueous Solutions ◽  
Fenton Reaction ◽  
Pulp Mill ◽  
Effluent Treatment ◽  
Pulp Mill Effluent ◽  
Large Decrease ◽  
Dihydroxybenzoic Acid ◽  
Pulp Bleaching ◽  
Efficient Option

Fenton reaction, which involves hydrogen peroxide and ferrous ion, has been proposed as an efficient option for effluent treatment. In this work, the treatment of a pulp bleaching effluent using Fenton-type reactions assisted by either, 2,3-dihydroxybenzoic acid (2,3-DHBA), 3,4-dihydroxybenzoic acid (3,4-DHBA) and 1,2-dihydroxybenzene (CAT), were studied. The treatment was evaluated by the removal of adsorbable organochloride compounds (AOX) and toxicity. Furthermore, the degradation of 2-chlorophenol and 4-chlorophenol in aqueous solutions were carried out, separately. Increase in oxidative activities of Fenton-type reactions mediated by the dihydroxybenzenes (DHBs) were found. These activities enhancement were related with a higher production of activated species by Fe/DHBs/H2O2, as indicted by chemiluminesce. The large decrease in AOX values and toxicity of the treated bleaching effluent by DHBs at pH 4.0 and 7.0 showed that 2,3-DHBA enhanced the activity of the Fenton reaction. The use of 3,4-DHBA and CAT resulted in loss of efficiencies of Fenton reaction to effluent treatment but not to pure chlorophenol solutions. At pH 7.0 lower efficiencies than those at pH 4.0 were achieved.

Removal of individual sterols during secondary treatment of pulp mill effluents

2012 ◽  
Vol 47 (1) ◽  
pp. 56-65 ◽  
Author(s):  
Zahid Mahmood-Khan ◽  
Eric R. Hall
Keyword(s):  
Pulp Mill ◽  
Effluent Treatment ◽  
Secondary Treatment ◽  
Waste Sludge ◽  
Paper Manufacturing ◽  
Secondary Effluents ◽  
Treatment Facilities ◽  
Pulp Mill Effluents ◽  
Sterol Profile ◽  
Pass Through

Analysis of plant sterols in pulp mill effluents is complex and several investigations have combined wood extractives with sterols or have reported total sterols collectively. The present study exclusively focuses on the fate of individual sterols generated in pulp and paper manufacturing as they pass through activated sludge biotreatment system. Before secondary treatment the pulp mill effluents contained 33% ß-sitosterol, 26% campesterol, 22% ß-sitostanol, 17% stigmasterol and 2% ergosterol (1,000–1,800 μg/L mean total sterols). After treatment, the effluents contained 44% ß-sitosterol, 22% campesterol, 18% ß-sitostanol, 14% stigmasterol and 2% ergosterol (176–428 μg/L mean total sterols). Each sterol fraction showed different removal efficiency. ß-Sitosterol, the major fraction, was removed relatively poorly (65%) while campesterol was removed most efficiently (81%) compared with the removal of other fractions (ß-sitostanol 74% and stigmasterol 64%). The differential removal of sterol fractions altered the sterol profile during different stages of the secondary treatment. Owing to its poor removal, ß-sitosterol is the most persistent fraction in treated/untreated pulp mill effluents. Typically, 21% of the incoming sterols were contained in secondary effluents and 23% in waste sludge without biodegradation. Optimizing the design/operation of treatment systems for removal of ß-sitosterol and stigmasterol would improve the performance of effluent treatment facilities.

Kinetics of pulp mill effluent treatment by ozone-based processes

2009 ◽  
Vol 168 (2-3) ◽  
pp. 875-881 ◽  
Author(s):  
Chun-Han Ko ◽  
Po-Hung Hsieh ◽  
Meng-Wen Chang ◽  
Jia-Ming Chern ◽  
Shih-Min Chiang ◽  
...  
Keyword(s):  
Pulp Mill ◽  
Effluent Treatment ◽  
Pulp Mill Effluent ◽  
Kinetics Of

scholarly journals Analisis Kualitas Air dan Status Mutu Serta Beban Pencemaran Sungai Mahap di Kabupaten Sekadau Kalimantan Barat

2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Ranty Christiana ◽  
Ika Muthya Anggraini ◽  
Hezliana Syahwanti
Keyword(s):  
Water Quality ◽  
Government Regulation ◽  
Pollution Index ◽  
Quality Standard ◽  
River Pollution ◽  
Sample Survey ◽  
Survey Method ◽  
Pollution Load ◽  
The People ◽  
The Status

<p>Sungai Mahap is used by the people of Nanga Mahap Village, Nanga Mahap District, Sekadau Regency for daily needs such as cooking, transportation and even consumption as drinking water. Utilization is done by the community because this area has not been flooded with clean water facilities. The quality and status of the Mahap River water quality standard needs to be further examined to study the feasibility of water as an air source used by the community regarding the importance of increasing plantation activities upstream. This research uses descriptive method using quantitative. Air sampling was conducted using a sample survey method with proposed parameters namely BOD, COD, pH, DO, TSS and NH3. Water quality testing is based on Government Regulation No. 82 of 2001 and determines the status of water quality using the STORET method and the pollution index based on the Decree of the Minister of Environment No.115 of 2003. In this study, the river pollution load was also calculated. The results show that the composition of BOD, COD, and Fe has exceeded the specified quality standards. The water quality status of the Mahap River is classified as moderate to severe based on the STORET method and Pollution Index. The highest river pollution load occurs at point II, in the dry season at 104.725 kg/day and in the rainy season at 171.873 kg/day</p>

scholarly journals Synedra sp. sebagai Mikroalga yang Ditemukan di Sungai Besuki Porong Sidoarjo, Jawa Timur

2015 ◽  
Vol 8 (1) ◽  
pp. 57
Author(s):  
DINA ISTI’ANAH ◽  
MOCH. FAIZUL HUDA ◽  
AINUN NIKMATI LAILY
Keyword(s):  
Water Pollution ◽  
Environmental Factors ◽  
Light Intensity ◽  
Air Temperature ◽  
Aquatic Environment ◽  
Pollution Load ◽  
Pollutant Load ◽  
The Status ◽  
Water Disposal ◽  
Mud Flow

Microalgae in Sidoarjo Porong River is one component that can be used as bio-indicators of an imbalance in the ecosystem due to pollution load. Since the end of 2009, the River Porong Sidoarjo mud flow of water into which further aggravate the pollutant load to the Porong River. Water disposal Sidoarjo mud into the Porong River is thought to cause changes in the quality or increase water pollution. This study aims to determine phytoplankton found and to know the status of pollution in the river Besuki Porong Sidoarjo. Sampling was performed twice microalgae by using a plankton net and without plankton net or directly in September 2014. The results showed that the kind of microalgae found Synedra sp. The River Porong Sidoarjo. Synedra sp. is a type of algae from Chrysophyceae division that can live in almost every aquatic environment enough sunlight to sustain its activities. Environmental factors were measured at the time of sampling are: light intensity of 251 lux, the pH of 8, the water temperature was 29 °, and the air temperature at 32°C.

Recirculation of treated effluent in the bleaching of kraft pulp

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 8944-8964
Author(s):  
Erika Nascimben Santos ◽  
Claudia Mudadu Silva ◽  
Jorge Luiz Colodette ◽  
Samilly B. Zanith de Almeida ◽  
Antonio José Vinha Zanuncio ◽  
...  
Keyword(s):  
Kraft Pulp ◽  
Treatment Plant ◽  
Pulp Mill ◽  
Effluent Treatment ◽  
Organic Load ◽  
Kraft Pulp Mill ◽  
Treated Effluent ◽  
Effluent Treatment Plant ◽  
Attractive Option ◽  
Washing Water

The bleaching plant of a kraft pulp mill is the sector that consumes water and generates effluent with the highest volume. Water recycling is an attractive option to reduce water consumption and effluent generation. This study evaluated the technical feasibility of using treated effluent as washing water in the bleaching stages. The bleaching sequence was simulated in the laboratory using four types of washing water: deionized water, whitewater, low organic load effluent, and high organic load effluent. To achieve 90% ISO pulp brightness, the ClO2 consumption increased from 8.1 kg ClO2 odt-1 when using water to 13.8 and 16.3 kgClO2 odt-1 for the low and high organic effluents. Physical and optical tests of the hand-sheet papers did not show any statistical difference between various washing waters. The filtrates showed values that did not burden the efficiency of the effluent treatment plant. It was possible to use effluent in the bleaching stages, considering that the filtrates and the produced paper complied with the quality standards.

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