Application of vibration milling for advanced wastewater treatment and excess sludge reduction

2012 ◽  
Vol 65 (1) ◽  
pp. 142-148 ◽  
Author(s):  
Akira Sano ◽  
Akira Senga ◽  
Hiroshi Yamazaki ◽  
Hiroki Inoue ◽  
Kai-Qin Xu ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Phosphorus Removal ◽  
Ball Mill ◽  
Biological Treatment ◽  
Sludge Reduction ◽  
Wastewater Treatment Process ◽  
Treatment Tank ◽  
Excess Sludge Reduction ◽  
Activated Sludge Processes ◽  
Vibration Milling

As a new sludge reduction technology with a phosphorus removal mechanism, a vibration milling technology that uses iron balls have been applied to the wastewater treatment process. Three anaerobic–aerobic cyclic activated sludge processes: one without sludge disintegration; one disintegrated sludge by ozonation; and the other disintegrated sludge with the vibrating ball mill were compared. Ozonation achieved the best sludge reduction performance, but milling had the best phosphorus removal. This is because iron was mixed into the wastewater treatment tank due to abrasion of the iron balls, leading to settling of iron phosphates. Thus, the simple means of using iron balls as the medium in a vibrating ball mill can achieve both a sludge reduction of half and excellent phosphorus removal. Material balances in the processes were calculated and it was found that carbon components in disintegrated sludge were more resistant to biological treatment than nitrogen.

scholarly journals Excess Sludge Reduction and Biomass Characteristics in Swim-Bed Wastewater Treatment Process

2007 ◽  
Vol 43 (2) ◽  
pp. 73-82
Author(s):  
YINGJUN CHENG ◽  
DAISUKE YAZAKI ◽  
SEN QIAO ◽  
YUSUKE WATANABE ◽  
TOICHIRO KOYAMA ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Treatment Process ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Wastewater Treatment Process ◽  
Excess Sludge Reduction

scholarly journals Research on System Optimizing of AAO-BAF Wastewater Treatment Process

2018 ◽  
Vol 53 ◽  
pp. 04028
Author(s):  
Shoubin Zhang ◽  
Wei Sun ◽  
Wenhai Jiao ◽  
Liping Qiu ◽  
Jingxiu Zhong ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Electron Acceptor ◽  
Phosphorus Removal ◽  
Treatment Process ◽  
Treatment System ◽  
Research Progress ◽  
Combined Processes ◽  
Wastewater Treatment Process ◽  
Combined Process ◽  
Wastewater Treatment System

To meet the more strict discharging standard, some combined processes have emerged to realize denitrification and phosphorus removal of wastewater more efficiently. Among them, AAO-BAF combined process was an efficient one. The AAO-BAF system was composed of AAO reactor and BAF. The AAO process was the main unit to complete phosphorus removal and denitrification. The BAF process, external nitrification unit, was mainly used to provide enough electron acceptor for denitrifying bacteria in AAO reactor, which could enhance the efficiency of denitrification of the whole system. So the system optimizing was essential to AAO-BAF combined process. In this paper, the research progress of AAO-BAF wastewater treatment system was summarized and some system optimizing methods were raised too.

A small scale hydroponics wastewater treatment system under Swedish conditions

2004 ◽  
Vol 48 (11-12) ◽  
pp. 161-167 ◽  
Author(s):  
A. Norström ◽  
K. Larsdotter ◽  
L. Gumaelius ◽  
J. la Cour Jansen ◽  
G. Dalhammar
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Phosphorus Removal ◽  
Biological Treatment ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Small Scale ◽  
Clean Water ◽  
Surrounding Area ◽  
Sand Filter

A treatment plant using conventional biological treatment combined with hydroponics and microalgae is constructed in a greenhouse in the area of Stockholm, Sweden. The treatment plant is built for research purposes and presently treats 0.559 m3 of domestic wastewater from the surrounding area per day. The system uses anoxic pre-denitrification followed by aerobic tanks for nitrification and plant growth. A microalgal step further reduces phosphorus, and a final sand filter polishes the water. During a three week period in July 2002 the treatment capacity of this system was evaluated with respect to removal of organic matter, phosphorus and nitrogen. 90% COD removal was obtained early in the system. Nitrification and denitrification was well established with total nitrogen reduction of 72%. Phosphorus was removed by 47% in the process. However, higher phosphorus removal values are expected as the microalgal step will be further developed. The results show that acceptable treatment can be achieved using this kind of system. Further optimisation of the system will lead to clean water as well as valuable plants to be harvested from the nutrient rich wastewater.

Biological sludge solubilisation for reduction of excess sludge production in wastewater treatment process

2006 ◽  
Vol 54 (5) ◽  
pp. 51-58 ◽  
Author(s):  
T. Yamaguchi ◽  
Y. Yao ◽  
Y. Kihara
Keyword(s):  
Wastewater Treatment ◽  
Biological Treatment ◽  
Wastewater Treatment Plants ◽  
Experimental Period ◽  
Excess Sludge ◽  
Wastewater Treatment Process ◽  
Biological Sludge ◽  
Scale Experiment ◽  
Sludge Production

A novel sludge disintegration system (JFE-SD system) was developed for the reduction of excess sludge production in wastewater treatment plants. Chemical and biological treatments were applied to disintegrate excess sludge. At the first step, to enhance biological disintegration, the sludge was pretreated with alkali. At the second step, the sludge was disintegrated by biological treatment. Many kinds of sludge degrading microorganisms integrated the sludge. The efficiency of the new sludge disintegration system was confirmed in a full-scale experiment. The JFE-SD system reduced excess sludge production by approximately 50% during the experimental period. The quality of effluent was kept at quite a good level. Economic analysis revealed that this system could significantly decrease the excess sludge treatment cost.

scholarly journals In situ excess sludge reduction in SBBR through uncoupling of metabolism induced by novel aeration modes

RSC Advances ◽  
2017 ◽  
Vol 7 (46) ◽  
pp. 29058-29064 ◽  
Author(s):  
Benzhou Gong ◽  
Yingmu Wang ◽  
Jiale Wang ◽  
Yanyan Dou ◽  
Jian Zhou
Keyword(s):  
Wastewater Treatment ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Triangular Wave ◽  
Square Wave ◽  
Sawtooth Wave ◽  
Bench Scale ◽  
Biofilm Reactors ◽  
Excess Sludge Reduction

To minimize sludge yield (Yobs) in bench-scale sequencing batch biofilm reactors (SBBRs) during wastewater treatment, novel aeration modes were employed: triangular-wave aeration, square-wave aeration, sawtooth-wave aeration and continuous aeration.

scholarly journals Optimal-Setpoint-Based Control Strategy of a Wastewater Treatment Process

Processes ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 1203
Author(s):  
Sergiu Caraman ◽  
Laurentiu Luca ◽  
Iulian Vasiliev ◽  
Marian Barbu
Keyword(s):  
Wastewater Treatment ◽  
Biological Treatment ◽  
Treatment Process ◽  
Treatment Plant ◽  
Operating Regime ◽  
Performance Criterion ◽  
Optimal Operating ◽  
Wastewater Treatment Process ◽  
Control Loops ◽  
Current Operating

This paper presents an optimal-setpoint-based control strategy of a wastewater treatment process (WWTP). The treatment plant serves the city of Galati, located in Eastern Romania, a city with a population of 250,000 inhabitants. As the treatment plant includes several control loops (based upon PI controllers), an efficient operation means the establishing of an optimal operating point regardless of the pluviometric regime (DRY, RAIN and STORM) or transitions between regimes. This optimal operating point is given by the optimal setpoint set (setpoints of the dissolved oxygen concentration in the aerated tanks, setpoint of the nitrate concentration, external recirculation flow, sludge flow extracted from the primary clarifier and excess sludge flow from the secondary clarifier) of the treatment plant control loops. The control algorithm has two distinct parts: the first part consists of computing the optimal aforementioned setpoints, based on the mathematical model of the treatment plant developed in SIMBA. For optimization (performed with genetic algorithms) an aggregate performance criterion that takes into consideration the quality of the effluent, the cost of the wastewater treatment as well as the percentage exceeding of the main parameters of the treated water was used; the second part consists of computing the optimal setpoint set which will be further applied directly in the process based on the membership to the current operating regime. The computation of the membership degrees to the current operating regime was performed with a fuzzification block, based on the information about the inflow rate in the biological treatment plant. For simulations, three data files of the influent were created, aiming at determining the optimal setpoints in each operating regime, and a fourth one containing an influent scenario able to globally test the system operation. The obtained results showed the efficiency of the biological treatment, the effluent quality index being about ten times lower than that of the influent. Furthermore, the genetic algorithm used in optimization determines accurately enough the minimum value of the performance criterion in the case of each pluviometric regime, the lowest value of the performance criterion being obtained in DRY operating regime and the highest values in RAIN and STORM regimes. This is mainly due to the increase of the treatment cost and to small exceeding of the limits of several quality parameters such as chemical oxygen demand and ammonium concentration in the two regimes mentioned above. The fuzzification block aims to achieve a smooth transition from one operating regime to another, thus determining easier operating regimes of the treatment plant actuators and contributing to the increase of their life cycle.

Excess sludge reduction in activated sludge processes by integrating biomass alkaline heat treatment

2001 ◽  
Vol 44 (2-3) ◽  
pp. 437-444 ◽  
Author(s):  
M. Rocher ◽  
G. Roux ◽  
G. Goma ◽  
A. Pilas Begue ◽  
L. Louvel ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Wastewater Treatment ◽  
Activated Sludge ◽  
Waste Treatment ◽  
Ralstonia Eutropha ◽  
Synthetic Wastewater ◽  
Waste Activated Sludge ◽  
Excess Sludge ◽  
Wastewater Treatment Process ◽  
Activated Sludge Processes

With new EC regulations, alternative treatment and disposal techniques of the excess sludge produced by activated sludge wastewater treatment plants have to be developed. To decrease activated sludge production yield, microbial cell lysis can be amplified to enhance cryptic growth (biomass growth on lysates). Cell breakage techniques (thermal, alkaline and a combination) were studied to generate Ralstonia eutropha (strain model) and waste activated sludge lysates and to evaluate their biodegradability. Gentle treatment conditions by alkaline waste treatment (20 min at 60°C and pH 10 by NaOH addition) allowed waste activated sludge to be solubilized by a two step process (instantaneous and post-treatment) giving a dissolved organic carbon released by the total suspended solids treated of 267 mgDOC.g-1TSS. The biodegradation of the soluble fraction of the lysates by fresh sludge reached 75 and 90% after 48 and 350 hrs of incubation respectively. A validation on a laboratory scale by insertion of a liquor alkaline heat treatment loop in a biological synthetic wastewater treatment process was carried out. A reduction of 37% of the excess sludge was obtained without altering the purification yield of the process.

New Nitrogen and Phosphorus Removal Process Development Based on Simulation

2013 ◽  
Vol 663 ◽  
pp. 958-963
Author(s):  
Chang Ming Shen ◽  
Dian Hai Yang ◽  
Guo Hua Wang
Keyword(s):  
Wastewater Treatment ◽  
Phosphorus Removal ◽  
Process Development ◽  
Domestic Wastewater ◽  
Pollutant Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Wastewater Treatment Process ◽  
Removal Process ◽  
Removal Capacity

Nitrogen and phosphorus are the nutrients induced eutrophication, therefore the removal of nitrogen and phosphorus is the main target of domestic wastewater treatment. In order to achieve better nutrient removal effect with lower construction and operation cost, a new nitrogen and phosphorus removal process was developed based on simulation. New process named MUST was developed by mixing UCT and step-feed BNR technology together, and possessed the advantages of two processes. The results of simulation show that MUST can achieve similar treating effect with 20% shorter hydraulic retention time (HRT) compared with UCT process. The influent splitting ratio of 4:3:3 was recommended for MUST operation. A pilot experiment of MUST was also carried out according to simulation results, and achieved very good pollutant remove effect, the average COD, NH4+-N, TN, TP removal efficiency were 85.4%, 94.0%, 65.1%, 62.3% respectively under the condition of low influent COD/TN ratio. Considering the excellent pollutant removal capacity of MUST, an upgrade project chose it as wastewater treatment process. This paper just starts the research of MUST, further study is necessary and valuable.

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