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Lihui Zhang, He Liu, Zhiyong Zheng, Huijun Ma, Meng Yang, Hongbo Liu
Raw sludge was pretreated, and the separated sludge liquid was used as substrate in a continuous operated up-flow anaerobic sludge blanket reactor to produce volatile fatty acids (VFAs). The highest VFA productivity of continuous fermentation with sludge liquid at an organic loading rate (OLR) of 10.0 kg COD/m(3)/d was about 5.0-fold and 4.0-fold higher than batch and semi-continuous fermentation with pretreated sludge slurry, respectively. Moreover, the liquid fermentation with an OLR of 10.0 kg COD/m(3)/d consumed the least energy, which was about 10...
November 4, 2017: Bioresource Technology
Xiao Huang, Wenyi Dong, Hongjie Wang, Yangyang Feng
This study aimed to investigate the effect of acid- or alkali-treatment on volatile fatty acids (VFAs) production and microbiological mechanism during primary sludge anaerobic fermentation. Seven fermentation experiments were conducted at different pH (3-12). Results showed that the optimal pH was 10 for accumulation of VFAs. High-throughput sequencing results indicated that acid and alkali treatment could inhibit Erysipelotrichaceae_UCG-004 and norank_p_Aminicenantes, instead of promoting Pseudomonas and Tissierella at acidic and alkaline condition, respectively...
November 4, 2017: Bioresource Technology
Jia Meng, Jiuling Li, Jianzheng Li, Philip Antwi, Kaiwen Deng, Jun Nan, Pianpian Xu
To enhance nutrient removal more cost-efficiently in microaerobic process treating piggery wastewater characterized by high ammonium (NH4(+)-N) and low chemical oxygen demand (COD) to total nitrogen (TN) ratio, a novel upflow microaerobic biofilm reactor (UMBR) was constructed and the efficiency in nutrient removal was evaluated with various influent COD/TN ratios and reflux ratios. The results showed that the biofilm on the carriers had increased the biomass in the UMBR and enhanced the enrichment of slow-growth-rate bacteria such as nitrifiers, denitrifiers and anammox bacteria...
November 11, 2017: Bioresource Technology
Lin Liu, Yuling Hong, Xin Ye, Lili Wei, Jie Liao, Xu Huang, Chaoxiang Liu
Effect of reaction variables of in situ transesterification on the biodiesel production, and the characteristic differences of biodiesel obtained from aerobic granular sludge (AG) and algae-bacteria granular consortia (AAG) were investigated. The results indicated that the effect of variables on the biodiesel yield decreased in the order of methanol quantity > catalyst concentration > reaction time, yet the parameters change will not significantly affect biodiesel properties. The maximum biodiesel yield of AAG was 66...
November 4, 2017: Bioresource Technology
Yujuan Chen, Huijun He, Hongyu Liu, Huiru Li, Guangming Zeng, Xing Xia, Chunping Yang
The removal performance, activated sludge characteristics and microbial community in sequencing batch reactors (SBRs) were studied at salinity ranging from 0 to 20 g/L. Results showed that salinity deteriorated the removal performance. Removal rate of ammonium (NH4(+)-N), total phosphorus (TP) and chemical oxygen demand (COD) were gradually dropped from 95.34%, 93.58% and 94.88% (0 g/L) to 62.98%, 55.64% and 55.78% (20 g/L), respectively. The removals of NH4(+)-N and TP were mainly influenced during aerobic phase...
October 31, 2017: Bioresource Technology
Qian Li, Manjuan Xu, Gaojun Wang, Rong Chen, Wei Qiao, Xiaochang Wang
Batch experiments were conducted using biochar (BC) to promote stable and efficient methane production from thermophilic co-digestion of food waste (FW) and waste activated sludge (WAS) at feedstock/seed sludge (F/S) ratios of 0.25, 0.75, 1.5, 2.25, and 3. The results showed that the presence of BC dramatically shortened the lag time of methane production and increased the methane production rate with increased organic loading. The higher buffer capacity and large specific surface area of BC promoted microorganism growth and adaption to VFAs accumulation...
November 4, 2017: Bioresource Technology
Weiwei Cai, Yu Liu
Although on-line chemical cleaning has been extensively employed for maintaining the MBR permeability, little attention has been given to the negative impacts of such prevalent membrane cleaning practice. This study thus comparatively investigated the potential release of dissolved organic matter (DOM) from activated sludge upon the exposure to different kinds of frequently-used cleaning reagents, i.e. NaClO, H2O2, HCl and NaOH. It was found that NaClO at 50 and 80 mg L(-1) triggered significant release of DOM, while NaOH strongly promoted soluble nitrogen release...
November 8, 2017: Chemosphere
Le Fang, Jiang-Shan Li, Ming Zhi Guo, C R Cheeseman, Daniel C W Tsang, Shane Donatello, Chi Sun Poon
Chemical extraction of phosphorus (P) from incinerated sewage sludge ash (ISSA) is adversely influenced by co-dissolution of metals and metalloids. This study investigated P recovery and leaching of Zn, Cu, Pb, As and Ni from ISSA using inorganic acids (sulphuric acid and nitric acid), organic acids (oxalic acid and citric acid), and chelating agents (ethylenediaminetetraacetic acid (EDTA) and ethylene diamine tetramethylene phosphonate (EDTMP)). The aim of this study was to optimize a leaching process to recover P-leachate with high purity for P fertilizer production...
November 8, 2017: Chemosphere
Bin-Bin Wang, Xue-Ting Liu, Jian-Meng Chen, Dang-Cong Peng, Feng He
Characteristics of extracellular polymeric substances (EPS) in activated sludge strongly depend on wastewater substrates. Proteinaceous substrates (ProS) present in heterogeneous polymeric form are intrinsic and important parts of wastewater substrates for microorganisms in activated sludge systems. However, correlations between ProS and characteristics of EPS are scarce. This study systematically explored the impacts of monomeric (Mono-), low polymeric (LoP-) and high polymeric (HiP-) ProS on compositions and functional groups of EPS in activated sludge...
November 3, 2017: Water Research
S Sid, A Volant, G Lesage, M Heran
Energy consumption and sludge production minimization represent rising challenges for wastewater treatment plants (WWTPs). The goal of this study is to investigate how energy is consumed throughout the whole plant and how operating conditions affect this energy demand. A WWTP based on the activated sludge process was selected as a case study. Simulations were performed using a pre-compiled model implemented in GPS-X simulation software. Model validation was carried out by comparing experimental and modeling data of the dynamic behavior of the mixed liquor suspended solids (MLSS) concentration and nitrogen compounds concentration, energy consumption for aeration, mixing and sludge treatment and annual sludge production over a three year exercise...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Xu Zhou, Wenbiao Jin, Hongyi Chen, Chuan Chen, Songfang Han, Renjie Tu, Wei Wei, Shu-Hong Gao, Guo-Jun Xie, Qilin Wang
The enhancement of sludge dewaterability is of great importance for facilitating the sludge disposal during the operation of wastewater treatment plants. In this study, a novel oxidative conditioning approach was applied to enhance the dewaterability of waste activated sludge by the combination of zero-valent iron (ZVI) and peroxymonosulfate (PMS). It was found that the dewaterability of sludge was significantly improved after the addition of ZVI (0-4 g/g TSS) (TSS: total suspended solids) and PMS (0-1 g/g TSS)...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Ninad Oke, Swati Singh, Anurag Garg
The bleaching effluent discharged from a pulp and paper mill contains chlorinated organic compounds which are toxic to living matter. Physicochemical treatments such as coagulation and different advanced oxidation processes (AOPs) were employed for combined bleaching effluent generated from the first two stages (i.e. chlorination and alkali extraction) (pH = 3.5, chemical oxygen demand (COD) = 1,920 mg/L, and total organic carbon (TOC) = 663 mg/L). At optimum conditions (pH = 7.5, polyaluminium chloride (PAC) dose = 3...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Baolin Hou, Renjian Deng, Bozhi Ren, Zhi Li
A novel type of catalytic particle electrode (SAC-Fe) was developed from sewage sludge and iron sludge via a facile method. The catalytic particle electrodes (CPEs) were also supposed to be heterogeneous catalyst for electro-Fenton (EF). The CPEs were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). SAC-Fe showed superior porous structure and higher adsorption capacity and catalytic activity than Fe3O4 magnetic nanoparticles. Catechol and total organic carbon (TOC) removal efficiency can reach 96...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Renato P Ribeiro, Rodrigo F Bueno, Roque P Piveli, Débora C Kligerman, William Z de Mello, Jaime L M Oliveira
The continuous measurements of N2O emissions from the aeration tanks of three activated sludge wastewater treatment plants (WWTPs) operated with biological nitrogen removal (BNR) and non-BNR were performed during the different operating conditions of several parameters, such as aeration, dissolved oxygen (DO) profiling and organic shock loading (with landfill leachate). The nitrification process is the main driving force behind N2O emission peaks. There are indications that the variation of the air flow rate influenced N2O emissions; high N2O emissions denote over-aeration conditions or incomplete nitrification, with accumulation of NO2(-) concentrations...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Julie D Larsen, Steen M Nielsen, Charlotte Scheutz
Treatment of sludge in sludge treatment reed bed systems includes dewatering and mineralization. The mineralization process, which is driven by microorganisms, produces different gas species as by-products. The pore space composition of the gas species provides useful information on the biological processes occurring in the sludge residue. In this study, we measured the change in composition of gas species in the pore space at different depth levels in vertical sludge residue profiles during a resting period of 32 days...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Julie D Larsen, Steen M Nielsen, Charlotte Scheutz
Sludge treatment reed bed (STRB) systems combine dewatering, stabilisation and long-term storage of sludge. The main objective of this study was to investigate how substance concentrations change in the sludge residue during treatment and to conduct substance flow analyses covering the flow of substances in an STRB system over a 12-year treatment period, followed by three months' post-treatment in a stockpile area (SPA). Samples of sludge, reject water and sludge residue of different ages were collected at two Danish STRB system facilities and analysed for content of relevant substances...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Henrique Vieira de Mendonça, Jean Pierre Henry Balbaud Ometto, Marcelo Henrique Otenio, Alberto José Delgado Dos Reis, Isabel Paula Ramos Marques
New data on biogas production and treatment of cattle wastewater were registered using an upflow anaerobic sludge blanket-anaerobic filter (UASB-AF) hybrid reactor under mesophilic temperature conditions (37 °C). The reactor was operated in semi-continuous mode with hydraulic retention times of 6, 5, 3 and 2 days and organic loading rates of 3.8, 4.6, 7.0 and 10.8 kg CODt m(-3) d(-1). Biogas volumes of 0.6-0.8 m(3) m(-3) d(-1) (3.8-4.6 kg CODt m(-3) d(-1)) and 1.2-1.4 m(3) m(-3) d(-1) (7.0-10.8 kg CODt m(-3) d(-1)), with methane concentrations between 69 and 75%, were attained...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Fernanda Cristina P Rocha E Silva, Bruno Augusto C Roque, Nathalia Maria P Rocha E Silva, Raquel D Rufino, Juliana M Luna, Valdemir A Santos, Ibrahim M Banat, Leonie A Sarubbo
Oil sludge or waste generated in transport, storage or refining forms highly stable mixtures due to the presence and additives with surfactant properties and water forming complex emulsions. Thus, demulsification is necessary to separate this residual oil from the aqueous phase for oil processing and water treatment/disposal. Most used chemical demulsifiers, although effective, are environmental contaminants and do not meet the desired levels of biodegradation. We investigated the application of microbial biosurfactants as potential natural demulsifiers of petroleum derivatives in water emulsions...
November 15, 2017: AMB Express
Le-Ni Sun, Dan-Dan Pan, Xiang-Wei Wu, En-Dong Yang, Ri-Mao Hua, Qing X Li
A Gram-stain-positive, rod-shaped, non-motile bacterial strain, designated JW-1(T), was isolated from activated sludge collected from the outlet of an aeration tank in a prometryn-manufacturing plant, located in Binzhou City, Shandong province, PR China. Phylogenetic analysis, based on 16S rRNA gene sequences, indicated that strain JW-1(T) belongs to the genus Leucobacter and its closest neighbours are 'Leucobacter kyeonggiensis' F3-P9 (98.95 % similarity), Leucobacter celer subsp. astrifaciens CBX151(T) (98...
November 15, 2017: International Journal of Systematic and Evolutionary Microbiology
Wanlin Zheng, Zhiyong Yu, Yu Xia, Xianghua Wen
In this study, two parallel lab-scale anaerobic membrane bioreactors (AnMBRs), one of which was dosed with polyaluminum chloride (PAC) for membrane fouling control, were operated for treating excess activated sludge collected from a wastewater treatment plant (WWTP). The AnMBRs were inoculated with anaerobic digested sludge collected from an anaerobic digester of another WWTP. The microbial community of digested sludge and cake layer in AnMBRs, as well as that of excess sludge, was analyzed through polymerase chain reaction coupled with denaturing gradient gel electrophoresis (PCR-DGGE) and Illumina MiSeq...
November 14, 2017: Applied Microbiology and Biotechnology
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