scholarly journals The Auxiliary Effect of Different Bacterial Groups on the Degradation of Organic Matter in Refinery Wastewater by Bacillus Licheniformis

CONVERTER ◽  
2021 ◽  
pp. 868-872
Author(s):  
Yong Chen, Yue Jiao, Xiao Li Wen
Keyword(s):  
Organic Matter ◽  
Bacillus Licheniformis ◽  
Biological Treatment ◽  
Ammonia Nitrogen ◽  
Degradation Efficiency ◽  
Refinery Wastewater ◽  
Petrochemical Wastewater ◽  
Dominant Bacteria ◽  
Bacterial Groups ◽  
Wastewater Biological Treatment

In this paper, the biodegradation of organic compounds in refinery wastewater was studied. Different microbial communities suitable for the treatment of refinery wastewater were selected to degrade the pretreated wastewater. The results showed that the degradation efficiency of COD and ammonia nitrogen was 59.4% and 56.7% respectively; the degradation efficiency of COD and ammonia nitrogen was 50.2% and 60.6% respectively. It can be used as the dominant bacteria for further domestication and cultivation of petrochemical wastewater biological treatment.

scholarly journals Molecular transformation of dissolved organic matter in refinery wastewater

2020 ◽  
Author(s):  
Yuguo Li ◽  
Chen He ◽  
Ze Li ◽  
Yuxi Zhang ◽  
Baichun Wu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Dissolved Organic Matter ◽  
Solid Phase ◽  
Ammonia Nitrogen ◽  
Molecular Composition ◽  
Relative Mass ◽  
Refinery Wastewater ◽  
Treatment Processes ◽  
Oxygen Atoms

Abstract Dissolved organic matter (DOM) has an important impact on the water treatment and reuse of petroleum refinery wastewater. In order to improve the treatment efficiency, it is necessary to understand the chemical composition of the DOM in the treatment processes. In this paper, the molecular composition of DOM in wastewater samples from a representative refinery were characterized. The transformation of various compounds along the wastewater treatment processes was investigated. A total of 61 heteroatomic class species were detected from the DOM extracts, in which CHO (molecules composed of carbon, hydrogen, and oxygen atoms) and CHOS (CHO molecules that also contained sulfur) class species were the most abundant and account for 78.43% in relative mass peak abundance. The solid phase extraction DOM from the dichloromethane unextractable fraction exhibited a more complex molecular composition and contained more oxygen atoms than in the dichloromethane extract. During wastewater treatment processes, the chemical oxygen demand (COD) and ammonia-nitrogen were reduced by more than 90%. Volatile organic compounds (VOCs) accounted for about 30% of the total COD, in which benzene and toluene were dominant. After biochemical treatment, the VOCs were effectively removed but the molecular diversity of the DOM was increased and new compounds were generated. Sulfur-containing class species were more recalcitrant to biodegradation, so the origin and transformation of these compounds should be the subject of further research.

scholarly journals Refinery wastewater treatment via a multistage enhanced biochemical process

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chunhua Wang ◽  
Zijian Chen ◽  
Yuanhua Li ◽  
Kejun Feng ◽  
Zhongli Peng ◽  
...  
Keyword(s):  
Organic Pollutants ◽  
Biological Treatment ◽  
Treatment Process ◽  
Ammonia Nitrogen ◽  
Cod Removal ◽  
Refinery Wastewater ◽  
Petroleum Refinery Wastewater ◽  
Aerated Filter ◽  
Complex Organic ◽  
Biological Treatment Process

AbstractPetroleum refinery wastewater (PRWW) that contains recalcitrant components as the major portion of constituents is difficult to treat by conventional biological processes. An effective and economical biological treatment process was established to treat industrial PRWW with an influent COD of over 2500 mg L−1 in this research. This process is mainly composed of internal circulation biological aerated filter (ICBAF), hydrolysis acidfication (HA), two anaerobic–aerobic (A/O) units, a membrane biological reactor (MBR), and ozone-activated carbon (O3-AC) units. The results showed that, overall, this system removed over 94% of the COD, BOD5, ammonia nitrogen (NH4+-N) and phosphorus in the influent, with the ICBAF unit accounting for 54.6% of COD removal and 83.6% of BOD5 removal, and the two A/O units accounting for 33.3% of COD removal and 9.4% of BOD5 removal. The degradation processes of eight organic pollutants and their removal via treatment were also analyzed. Furthermore, 26 bacteria were identified in this system, with Proteobacteria and Acidobacteria being the most dominant. Ultimately, the treatment process exhibited good performance in degrading complex organic pollutants in the PRWW.

AN NOVEL UCSB-ANR INTEGRATED SYSTEM FOR EFFICIENT REMOVAL OF ORGANIC MATTER AND AMMONIA NITROGEN FROM SWINE WASTEWATER

2016 ◽  
Vol 15 (10) ◽  
pp. 2261-2266
Author(s):  
Xiaowei Li ◽  
Jie Zhang ◽  
Weiwei Zhao ◽  
Xuewen Yi ◽  
Wei Lin ◽  
...  
Keyword(s):  
Organic Matter ◽  
Ammonia Nitrogen ◽  
Integrated System ◽  
Swine Wastewater ◽  
Efficient Removal

scholarly journals Nutritional impact of partial or complete replacement of clover hay by untreated or biologically treated rice straw and corn stalks on: 1. growth performance and economic evaluation of growing New Zealand (NZW) White rabbits

2019 ◽  
Vol 43 (1) ◽  
Author(s):  
Hamed A. A. Omer ◽  
Sawsan M. Ahmed ◽  
Roshdy I. El-Kady ◽  
Aly A. El-Shahat ◽  
Mahmoud Y. El-Ayek ◽  
...  
Keyword(s):  
Organic Matter ◽  
New Zealand ◽  
Trichoderma Reesei ◽  
Rice Straw ◽  
Pleurotus Ostreatus ◽  
Biological Treatment ◽  
Neutral Detergent Fiber ◽  
Feed Conversion ◽  
Biological Treatments ◽  
Daily Gain

Abstract Background Agriculture by-products are considered a great potential value for utilization by ruminants as well as rabbits. They usually can be the maintenance and part of the production requirements. However, in developing countries, as well as in Egypt, animals suffer from shortage of feeds that are continuously increasing in costs. In general, biological treatments were shown to be the most effective and improved chemical composition of rice straw or corn stalks. Method This work aimed to investigate the possible ways of utilizing rice straws or corn stalks in rabbit feeding. The field work is designed to study the effect of biological treatment of Pleurotus ostreatus cultivated on rice straws and Trichoderma reesei cultivated on corn stalks and replacing clover hay by rice straws and corn stalks at levels of 0, 33, 66, and 100% either without or with microbes adding. Seventy-eight New Zealand White (NZW) rabbits aged 4–5 weeks (565 ± 13.57 g) were randomly divided into thirteen equal experimental groups. Results Untreated rice straws or biologically treated with Pleurotus ostreatus increased their contents of crude protein (CP) by 178.75 and 224.5% and nitrogen-free extract (NFE) by 6.30 and 24.53, respectively. Meanwhile, crude fiber (CF) content was reduced by 31.32 and 56.75%, and organic matter content was decreased by 2.81 and 5.51%, respectively, in comparison with the raw rice straws. Also, biological treatment of rice straws caused a decrease in values of neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (ADL), and hemicellulose contents in comparison with either raw or treated rice straws. Furthermore, biological treatment with Trichoderma reesei realized a decrease in organic matter (OM), CF, NDF, and ADF and increased CP and ash contents in corn stalks. NFE content of corn stalks was decreased as a result of treatment without or with Trichoderma reesei experimental rations by 11.95% and 3.82% compared to raw corn stalks (CS). Biological treatments with fungi significantly (P < 0.05) improved average daily gain (ADG) and feed conversion. ADG and feed conversion were significantly (P < 0.05) improved when rabbits were fed diets containing rice straw (RS) compared to that fed CS. Rabbits fed diets replaced clover hay (CH) with 33% or 66% of RS or CS significantly increased ADG compared to control and that replaced 100% of both RS and CS containing rations. Levels of replacing had no significant effect on their dry matter intake (DMI) values. The highest improvement in feed conversion was recorded with rabbits that received diets replaced 33% of berseem hay (BH) by RS or CS, followed by that replaced 66% of BH by RS or CS. There were significantly interactions between biological treatments (T), roughage source (S), and replacement levels (L) (T × S × L) only on ADG. The best fed conversion was realized by rabbits fed diet replaced BH with 33% of RS that are treated by Pleurotus ostreatus (4.05 g DMI/g gain). Rabbits fed 33% biologically treated rice straw with Pleurotus ostreatus showed the highest economic efficiency (179%) followed by rabbits that received 33% of both rice straws treated without Pleurotus ostreatus and rabbits that received corn stalks biologically treated with Trichoderma reesei (161%). Conclusion Biological treatments of rice straws by Pleurotus ostreatus or corn stalks by Trichoderma reesei were safe, and it improves their chemical analysis and improved both daily gain and feed conversion, decreasing the costing of diet formulation which consequently decreased the price of 1-kg live body weight.

Optimizing the Step-Feed Ratio and Modeling the Effluents of Aerobic Tank with ASM1 in ECOSUNIDE Process

2012 ◽  
Vol 178-181 ◽  
pp. 526-530
Author(s):  
Ruo Gu Li ◽  
Yan Qiu Zhang
Keyword(s):  
Organic Matter ◽  
Activated Sludge ◽  
Ammonia Nitrogen ◽  
Feed Ratio ◽  
Optimum Ratio ◽  
Matlab Simulink ◽  
Activated Sludge Model ◽  
Model Based ◽  
Autotrophic Bacteria ◽  
Optimum Model

The step feed model based on the Activated Sludge Model No.1 (ASM1) and the optimum model of the ammonia nitrogen (SNH) removal in wastewater were established. Four aeration tanks under the different step feed ratios were simulated by Matlab Simulink. The results show that single-feeding is conducive to the removal of readily biodegradable substrate (SS) and the growth of heterotrophic organisms (XBH), and to lower the biodegradable substrate (XS) at the same time. The SS, XS, and SNH concentrations are 1.36, 5.98, and 3.02 mg/L respectively in effluent. However, the step-feeding is conducive to the SNH removal, and the autotrophic bacteria (XBA) growth. Under the step feed ratio (25/25/25/25%), the SS, XS, and SNH concentrations are 2.64, 10.79, and 2.61 mg/L respectively. Under the optimum ratio (28.7/23.6/20.4/27.2%), step-feeding could further facilitate the removal of SNH and hinder the removal of organic matter, their concentrations are 2.70, 10.98, and 2.47 mg/L respectively.

The Research on the Current Situation and Advances of Petrochemical Wastewater Treatment

2012 ◽  
Vol 550-553 ◽  
pp. 2416-2419 ◽  
Author(s):  
Wen Jun Xiang
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Petrochemical Industry ◽  
Present Situation ◽  
Current Situation ◽  
High Salt ◽  
Petrochemical Wastewater ◽  
Existing Problems ◽  
The Future ◽  
At Home

At present, it is so prominent in the development of the petrochemical industry in China，and it is accompanied by petrochemical wastewater, which has become a big problem need to solve urgently.Because petrochemical wastewater mainly contains benzene-compound, organic matter, high salt wastewater and oil sewage, etc. They are very damaging and highly contaminated. The composition and properties of the petrochemical wastewater were introduced firstly, the current situation of petrochemical wastewater treatment at home and abroad were reviewed in the study. Especially the development of petrochemical industry in sichuan was introduced. Based on the present situation and the existing problems, put forward some countermeasures and expect technique develop direction in the future.

Effect of intraruminal infusion of urea on the response in voluntary food intake by sheep

1985 ◽  
Vol 36 (3) ◽  
pp. 483 ◽  
Author(s):  
JK Egan ◽  
PT Doyle
Keyword(s):  
Organic Matter ◽  
Food Intake ◽  
Dry Matter ◽  
Block Design ◽  
Ammonia Nitrogen ◽  
Dry Matter Intake ◽  
Plant Cell Walls ◽  
Randomized Block Design ◽  
Ad Libitum ◽  
Ad Libitum Intake

Six mature Merino sheep received three treatments in a randomized block design experiment. The treatments were: chopped oaten hay diet at 90% of ad libitum intake without urea (L); the ciet offered at the same level as for L with urea infused into the rumen at 11.5 g kg-1 dry matter intake (LU); and the diet offered at 90% of the ad libitum intake achieved with urea infused at 11.5 g kg-1 dry matter intake (HU). Sheep given HU consumed 37% more (P < 0.01) organic matter (OM) than those fed L or LU, but the apparent digestibility of OM did not vary (59.2-61.8%) between treatments. The addit onal food consumption was associated with c. 20% increase (P < 0.05) in the weight of OM in the reticulorumen and significantly higher (by 10-35%; P < 0.05) fractional outflow rates of most dietary and microbial constituents of digesta. The fractional digestion rate of potentially digestible plant cell walls was not affected by urea, but the flow of microbial non-ammonia nitrogen from the abomasum was enhanced (L, 7.0; LU, 8.2; HU, 12.5 g day-1; P < 0.05). The results of this study suggest that the stimulatory effect of urea upon food intake was associated with the provision of additional microbial protein for digestion in the intestines, rather than changes in the rate or extent of organic matter fermentation in the reticulorumen.

Research on Nitrogen Removal Performance of Leachate Treatment of WSIP Reactor

2011 ◽  
Vol 55-57 ◽  
pp. 789-795
Author(s):  
Xiu Ju Duan ◽  
Qiang He ◽  
Ya Li Liu
Keyword(s):  
Nitrogen Removal ◽  
Biological Treatment ◽  
Orthogonal Experiment ◽  
Ammonia Nitrogen ◽  
Ammonia Removal ◽  
Leachate Treatment ◽  
Treatment Performance ◽  
Biomass Retention ◽  
Nitrification And Denitrification

This thesis put forward the treatment concept of “without Biomass Retention Sequential Batch Intensified Pretreatment (WSIP)” in leachate treatment, for sake of improving performance of nitrogen removal, optimizing excess water’s nutritional ratio and benefitting the follow-up aerobic biological treatment. Based on orthogonal experiment of WSIP Reactor’s leachate treatment performance, Conclusions can be drew: the removal performance of ammonia nitrogen and TN is higher of WSIP, in which short-cut nitrification and denitrification can be realized; HRT, DO and sequential period are remarkable factors of ammonia removal performance, TN removal performance and realization of short-cut nitrification and denitrification; In normal temperature, the most perfect functional parameter of WSIP Reactor is: HRT=4d, DO=0.75mg/L and sequential period is 6h.

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