Batchwise mesophilic anaerobic co-digestion of secondary sludge from pulp and paper industry and municipal sewage sludge

Aerobic biological treatment with activated sludge is the predominant process all over the world for treatment of pulp and paper industry wastewater. 50–70% of the biodegradable organic material is oxidized to CO2 and the rest is converted to bacterial biomass, typically termed as excess sludge or waste activated sludge (WAS). Handling and disposal of WAS in general and in particular from the pulp and paper industry face different processing difficulties, regulatory stringency due to organochlorine contamination and reluctance of people for reuse. With an objective of reducing the net disposable biomass, ozonation of WAS from a pulp and paper mill and from a laboratory scale batch activated sludge process operated with the wastewater and bacterial seed of the same pulp and paper mill have been carried out. With the mill sludge having predominant filamentous organisms 18% MLSS was reduced at an ozone dosage of 55 mg O3/g dry MLSS solid (DS) resulting in 2.5 times COD increase. With the laboratory sludge which is well structured and flocculating, only 6% MLSS was reduced at an ozone dosage of 55 mg O3/g DS. Ozonation mineralizes 26% and 20% AOX compounds embedded in the secondary sludge in the mill and laboratory sludge respectively at an ozone dosage of 55 mg O3/g DS. During ozonation, absorbed/adsorbed lignin on biomass was released which resulted in increased colour concentration. Ozonation can be a potential oxidative pretreatment process for reducing the WAS and paving the way for cost effective overall treatment of WAS.

Download Full-text

A review of secondary sludge reduction technologies for the pulp and paper industry

Water Research ◽

10.1016/j.watres.2006.04.001 ◽

2006 ◽

Vol 40 (11) ◽

pp. 2093-2112 ◽

Cited By ~ 177

Author(s):

Talat Mahmood ◽

Allan Elliott

Keyword(s):

Paper Industry ◽

Pulp And Paper Industry ◽

Pulp And Paper ◽

Sludge Reduction ◽

Secondary Sludge

Download Full-text

Aerobic composting and anaerobic digestion of pulp and paper mill sludges

Water Science & Technology ◽

10.2166/wst.1997.0409 ◽

1997 ◽

Vol 36 (11) ◽

pp. 181-188 ◽

Cited By ~ 21

Author(s):

Jari Jokela ◽

Jukka Rintala ◽

Aimo Oikari ◽

Olli Reinikainen ◽

Kari Mutka ◽

...

Keyword(s):

Anaerobic Digestion ◽

Scale Up ◽

Paper Mill ◽

Pulp And Paper ◽

Municipal Sewage ◽

Municipal Sewage Sludge ◽

Pulp And Paper Mill ◽

Aerobic Composting ◽

Secondary Sludge ◽

Volatile Solids

The feasibility of aerobic vessel composting and anaerobic digestion for the treatment of pulp and paper mill sludges were studied. The composting studies made use of primary and secondary sludge from a de-inking and paper mill. In six parallely aerated 500 1 vessels with various carbon : nitrogen (C:N) -ratios, the most optimal performance was obtained with C:N -ratios of c. 22–35, while higher and lower ratios delayed the temperature increase. With the optimal ratios, the thermophilic stage was reached within 36 h, and the stage lasted for about seven days. In the scale-up study (18 m3 compost vessel), the thermophilic stage was reached within 24 h. An effective dehydratation of the mass was obtained as the total solids (TS) content of the compost increased from 31.3– to 63.8– within 21 days. The anaerobic digestion of pulp and paper mill sludges was studied using two mesophilic 5 1 digesters, their feed sludges consisting of a mixture of municipal sewage sludge and primary and secondary sludge from a pulp and paper mill. With this feed mixture and with a loading rate of about 1.0 kg volatile solids (VS)/m3d a removal of about 27 to 40– VS and methane production of about 180 1/kgVSadded feed sludge were achieved during the 80 d study period. The study showed that pulp and paper mill sludges are amenable to both aerobic composting and anaerobic digestion.

Download Full-text

Development of Measures to Reduce the Negative Impact of Sewage Sludge from Pulp and Paper Production

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.c1071.1083s19 ◽

2019 ◽

Vol 8 (3S) ◽

pp. 330-334

Keyword(s):

Sewage Sludge ◽

Negative Impact ◽

Paper Industry ◽

Technical Information ◽

Paper Mill ◽

Pulp And Paper Industry ◽

Maximum Energy ◽

Current Strength ◽

Pulp And Paper ◽

Pulp And Paper Mill

The article analyzed the technogenic load of a pulp and paper mill as a source of waste generation. Based on the analysis, the waste groups of the pulp and paper industry with the excess of education standards were identified, and among these groups suitable for recycling and reuse. Among such wastes, osprey was isolated - waste from the processing of sewage sludge from the pulp and paper industry. The stages of the technological process of manufacturing pulp and paper products from recycled materials were also considered. An analysis of scientific and technical information was carried out, within the framework of which the features of the main technical solutions in the field of processing and disposal of osprey were investigated. An electro-osmotic plant was developed, the essence of which is to achieve maximum energy efficiency in the process of dewatering sewage sludge from the pulp and paper industry. According to the results of the experiments, a correlation assessment was made of the parameters of electroosmotic dehydration: reduction of the residual mass of the osprey and current strength on the plant plates during electroosmosis, from which it follows that the values of the cross-correlation coefficient are significantly affected by the electric field strength of the electroosmosis.

Download Full-text

A long-term chemical and infrared spectroscopy study on a soil amended with municipal sewage sludge

Agronomie ◽

10.1051/agro:2001115 ◽

2001 ◽

Vol 21 (2) ◽

pp. 169-178 ◽

Cited By ~ 20

Author(s):

Giovanni Gigliotti ◽

Pier Lodovico Giusquiani ◽

Daniela Businelli

Keyword(s):

Infrared Spectroscopy ◽

Sewage Sludge ◽

Municipal Sewage ◽

Municipal Sewage Sludge ◽

Spectroscopy Study

Download Full-text

Co-cooking nonwoods with hardwoods

TAPPI Journal ◽

10.32964/tj13.6.19 ◽

2014 ◽

Vol 13 (6) ◽

pp. 19-24

Author(s):

TROY RUNGE ◽

CHUNHUI ZHANG

Keyword(s):

High Performance Liquid Chromatography ◽

High Performance ◽

Paper Industry ◽

Pulp And Paper Industry ◽

Strength Properties ◽

Agricultural Residues ◽

Kraft Pulping ◽

Pulp And Paper ◽

Strength Increase ◽

Xylan Content

Agricultural residues and energy crops are promising resources that can be utilized in the pulp and paper industry. This study examines the potential of co-cooking nonwood materials with hardwoods as means to incorporate nonwood material into a paper furnish. Specifically, miscanthus, switchgrass, and corn stover were substituted for poplar hardwood chips in the amounts of 10 wt %, 20 wt %, and 30 wt %, and the blends were subjected to kraft pulping experiments. The pulps were then bleached with an OD(EP)D sequence and then refined and formed into handsheets to characterize their physical properties. Surprisingly, all three co-cooked pulps showed improved strength properties (up to 35%). Sugar measurement of the pulps by high-performance liquid chromatography suggested that the strength increase correlated with enriched xylan content.

Download Full-text