Applying entrapped mixed microbial cell techniques for biological wastewater treatment

1994 ◽  
Vol 29 (10-11) ◽  
pp. 487-495 ◽  
Author(s):  
P. Y. Yang ◽  
T. Ma ◽  
T. S. See ◽  
N. Nitisoravut
Keyword(s):  
Wastewater Treatment ◽  
Cellulose Triacetate ◽  
Suspended Solid ◽  
Microbial Cell ◽  
Biological Wastewater Treatment ◽  
Water And Wastewater Treatment ◽  
Biological Water ◽  
Suspended Solid Concentration ◽  
The University ◽  
Strength And Durability

The entrapment of mixed microbial cell was accomplished by using a porous material, such as cellulose triacetate, to confine the migration of microorganism. Synthetic glucose, phenol, carbaryl and nitrate wastewater was used as substrate to evaluate this process. Applying entrapped microbial cell techniques for biological water/wastewater treatment was previously investigated mainly by using the pure culture system. For the past six years, the University of Hawaii has investigated this technology for biological wastewater treatment by using a mixed culture approach. It was found that the developed carrier, using cellulose triacetate, is the most suitable for providing the necessary mechanical strength and durability under both the aerobic and anaerobic conditions. It also provides many advantages, such as a short start-up period, high effluent quality in terms of COD, NO3-N concentrations and removal efficiency, low effluent suspended solid concentration, and high SRT with low HRT. The process has potential to replace or upgrade the existing biological processes for water and wastewater treatment. A pre-engineered and packaged plant can be easily developed for a small wastewater treatment system for toxic or hazardous wastewater.

Packed-Entrapped-Mixed Microbial Cells for Small Wastewater Treatment

1990 ◽  
Vol 22 (3-4) ◽  
pp. 343-350 ◽  
Author(s):  
P. Y. Yang ◽  
M. L. Wang
Keyword(s):  
Wastewater Treatment ◽  
Calcium Alginate ◽  
Loading Rate ◽  
Cellulose Triacetate ◽  
Microbial Cell ◽  
Synthetic Wastewater ◽  
Cell Process ◽  
Suspended Solid Concentration ◽  
Sludge Recycling ◽  
Entrapped Mixed Microbial Cell

The primary goal of the research is to develop and evaluate a biological treatment system in which mixed microbial populations are physically immobilized by entrapment. The immobilized system was evaluated initially for its ability to remove simple benzene-based compounds from a synthetic wastewater as a model for treating pesticide-containing waters. Cellulose triacetate was used as the preparation of monocarrier and combined cellulose triacetate and calcium alginate were used for the preparation of bi-carrier. Phenol was used as substrate to test the entrapped mixed microbial cell process. Process performance including steady state, shock load and comparison of entrapped microbial cell process with and without entrapped microbial cell was investigated. It was concluded that the critical loading rate for phenol synthetic wastewater appeared to be 9 g COD/L/day. The COD removal efficiency could be maintained higher than 90%. Because of the low effluent suspended solid concentration, conventional-secondary-settling tanks could be eliminated. Also, the process could take both concentration and hydraulic shock loads of phenol synthetic wastewater successfully without the need of external sludge recycling. The equalization and external sludge recycling facilities equipped in the conventional wastewater treatment plant could be eliminated. When the process is operated only at low COD loading rate (less than 1.3 g/L/day), entrapped cells might not be required. However, when operated at higher loading rate, combined adsorbed and entrapped cells appeared to remove phenol more efficiently. For the application, mono-carrier (cellulose triacetate) is preferable to bi-carrier (cellulose triacetate and calcium alginate), since it is easier to prepare and the operational performance is better. Therefore, the application of packed-entrapped mixed microbial cell process for treatment of small-toxic-organic wastewater holds great potential.

scholarly journals Simulation of Biological Wastewater Treatment in Aerotanks with Moving Biocenosis

2021 ◽  
pp. 15-24
Author(s):  
M. M. Biliaiev ◽  
M. V. Lemesh ◽  
V. O. Zadoia ◽  
P. B. Mashykhina ◽  
L. H. Tatarko ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Numerical Model ◽  
Activated Sludge ◽  
Water Purification ◽  
Operating Conditions ◽  
Finite Difference Schemes ◽  
Transfer Model ◽  
Aeration Tank ◽  
Biological Wastewater Treatment ◽  
Biological Water

Purpose. The main purpose of the article is to develop a numerical model for the analysis of the process of biological wastewater treatment in a reactor with a mobile biocenosis. Methodology. For mathematical modeling of the process of biological wastewater treatment in a reactor with a moving biocenosis, a hydrodynamic model of a non-viscous vortex-free flow is used. We calculated the boundary conditions for the modeling equation on the surfaces of the bioreactor, solid walls, and the upper surface; at the inlet boundary; at the outlet boundary from the building. To calculate the process of movement of activated sludge and substrate in the bioreactor, a mass transfer model is used, which takes into account the convective-diffusion movement of the substrate and activated sludge. The process of biological water purification in that part of the bioreactor where there are no mobile biocenosis carriers will be calculated based on the Monod model. The process of biological water purification in the part of the bioreactor where there are mobile carriers is calculated on the basis of an empirical model in three stages. The first stage is determined using the Harremoes model. At the second stage, the rate of substrate «consumption» in the biofilm is calculated. At the third stage, the change in the substrate concentration in the zone where the biocenosis carriers are located is determined due to convective movement, substrate diffusion in the flow and its destruction in the biofilm on the carriers. The chaotic motion of biocenosis carriers in the reactor is modeled based on the parabolic diffusion equation. Finite-difference schemes are used for numerical integration of modeling equations. Findings. The software implementation of the constructed numerical model is carried out. A computational experiment to determine the efficiency of biological wastewater treatment in different parts of the bioreactor was conducted. Originality. An effective multifactorial numerical model has been created, which allows quick analysis of the efficiency of biological wastewater treatment in an aeration tank with mobile biocenosis carriers. Practical value. The created two-dimensional numerical model can be used for serial calculations at the stage of designing biological wastewater treatment systems and analysis of the efficiency of bioreactors under different operating conditions.

Application of Waste Banana Peels for Wastewater Treatment: A Review

2020 ◽  
Vol 17 (2) ◽  
pp. 596-602
Author(s):  
Nur Athirah Huzaisham ◽  
Noraini Marsi ◽  
Anika Zafiah Muhd Rus ◽  
Shaiful Rizal Masrol ◽  
Salwa Mahmood ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Inorganic Compounds ◽  
Adsorption Rate ◽  
Future Research ◽  
Water And Wastewater Treatment ◽  
Research Perspective ◽  
The Past ◽  
Biological Water ◽  
Water And Wastewater ◽  
Heavy Metal Ions Removal

This review paper focuses on the use of recycled banana peels for wastewater treatment. In India, more than 57.6 million tonnes of banana waste peels were produced each year, majorly are used as adsorbents to remove contaminants and pollutants that exist in the wastewater like heavy ions, organic and inorganic pollutants. To date, the use of waste banana peels as adsorbents have obtained substantial attention and countless modification have been done in order to improve their adsorption characteristics. Based on literature survey regarding the abundance of waste banana peels around the world, they are conceived to have considerable absorbency with optimistic application toward pollutants. According to published articles from the past 20 years, the technique of adsorption was recognized as most exceptional and cost-saving methods of treating wastewater with adsorption rate up to 98% of heavy metal ions removal and up to 98.93% for organic and inorganic compounds removal. Adsorption is most frequently used to remove atoms, molecules or ions from drinking water preparation, groundwater or as tertiary cleaning such as purification of biological water and wastewater treatment. Adsorption occurs when molecules in a liquid attach to the surface of a solid substance. This review extends applicable literature on the application of waste banana peels and its properties as an adsorbent on removing various pollutants in the wastewater. Evidently, adsorbents derived from waste banana peels demonstrated remarkable effectiveness towards removing various pollutants where the adsorption rate increases as the adsorbent dosage increases. Results concerning waste banana peels as adsorbents from several published articles have been discussed elaborately along with the future research perspective on waste banana peels.

Chemical Water and Wastewater Treatment VIII

2015 ◽  
Vol 4 (0) ◽  
pp. 9781780402840-9781780402840
Author(s):  
H. Hahn ◽  
E. Hoffman ◽  
H. Odegaard
Keyword(s):  
Wastewater Treatment ◽  
Water And Wastewater Treatment ◽  
Water And Wastewater ◽  
Chemical Water
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