scholarly journals Pemanfaatan Mikroalga dalam Penurunan Kadar Amonia dengan Variasi Penambahan Effective Microorganism

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
Anshah Silmi Afifah ◽  
Gita Prajati ◽  
Yosef Adicita ◽  
Darwin Darwin ◽  
Yura Witsqa Firmansyah
Keyword(s):  
Carbon Dioxide ◽  
Organic Compounds ◽  
Tap Water ◽  
Optimal Dose ◽  
Batch System ◽  
Biological Treatments ◽  
Solar Lighting ◽  
Dose Variation ◽  
Complex Organic ◽  
Effective Microorganism

The existence of microalgae in water -provides many benefits especially for biological treatments of wastewater. Microalgae have many species and are chlorophyll microorganisms. Photosynthesis carried out by microalgae requires essential nutrients such as CO2. Carbon dioxide can be obtained by symbiosis from other microorganisms, such as EM4, which can be used to decompose complex organic compounds into simple compounds (CO2). The addition of EM4 must be appropriate to make the photosynthesis process in microalgae take place optimally. Therefore, this study aims to determine the optimal dose variation of EM4 in the microalgae in the reactor. With variations in the doses tested were 0 mL, 1 mL, and 2 mL. The research was conducted by making artificial wastewater from liquid NPK, diluting it with tap water with a ratio of 1: 300. The test was carried out using a batch system, with solar lighting and aeration for 24 hours. The result of the best dose variation is the addition of 1 mL of EM4.  The largest decrease in ammonia levels is obtained which is then compared to the variation of the doses of 0 mL and 2 mL.

Some Experimental Discussion of Accuracies in Quantitative Virus Assessment for Water Supply

1985 ◽  
Vol 17 (10) ◽  
pp. 127-138
Author(s):  
Hisashi Sumitomo
Keyword(s):  
Public Health ◽  
Water Supply ◽  
Organic Compounds ◽  
Lake Biwa ◽  
Tap Water ◽  
Statistical Procedure ◽  
Statistical Nature ◽  
The Public ◽  
Public Risk ◽  
Precise Assessment

Chlorination has been believed to be the best sterilization method in water supply engineering for many years. However, the recent carcinogenic problem of trihalomethanes (THM) formed from organic compounds by chlorination requires us to assess the public health risk of THM. The author tried an assessment of a suitable chlorination technique considering both the effects of THM and viruses on human health, using Lake Biwa as a representative example of a water resource in Japan. Statistical handling of data was revealed to be important because of the statistical nature of the data. In other words, since both concentrations are very low in tap water, we need to quantify both the effects and concentrations with probabilities. In the first part of this paper, a statistical procedure and numerical results of the assessment of virus and THM risks are shown. In the second part some results of accuracies in virus experiments are briefly shown. These experiments concerning statistical problems are particularly important for more precise assessment of the public risk of viruses in tap water.

Wastewater treatment and nutrient removal in the combined reactor

1998 ◽  
Vol 38 (1) ◽  
pp. 87-95 ◽  
Author(s):  
M. Roš ◽  
J. Vrtovšek
Keyword(s):  
Organic Compounds ◽  
Industrial Wastewater ◽  
Design Procedure ◽  
Order Reaction ◽  
Treated Wastewater ◽  
Nitrification Rate ◽  
Zero Order Reaction ◽  
Aerobic Reactor ◽  
Complex Organic

A combined anaerobic anoxic aerobic reactor for the treatment of the industrial wastewater that contains nitrogen and complex organic compounds as well as its design procedure is presented. The purpose of our experiments was to find a simple methodology that would provide combined reactor design. The reactor is based on the combination of anaerobic, anoxic and aerobic process in one unit only. It was found that the HRT even under 1 hour in the anaerobic zone is long enough for the efficient transformation of complex organic compounds into readily biodegradable COD which is then used in dentrification process. In the N-NO3 concentration range 1.5-50 mg/l the denitrification rate could be expressed as half-order reaction when the CODrb was in excess. N-NO3 removal efficiency is controlled by the recycle flow from the aerobic to the anoxic zone. Nitrification rate can be expressed as first, half or zero-order reaction with respect to effluent N-NH4 concentration. Nitrification rate depends on the dissolved oxygen concentration and hydrodynamic conditions in the reactor. Case study for design of a pilot plant of the combined reactor for treatment of pre-treated pharmaceutical wastewater is shown. Characteristics of pre-treated wastewater were: COD=200 mg/l, BOD5=20 mg/l, N-Kjeldahl=80 mg/l, N-NH4=70 mg/l, N-NOx<1 mg/l, P-PO4=5 mg/l. Legal requirements for treated wastewater were: COD=<100 mg/l, BOD5<5 mg/l, N-NH4=<1 mg/l, N-NOx=<10 mg/l.

ChemInform Abstract: Catalytic Incorporation of Carbon Dioxide for the Synthesis of Organic Compounds

ChemInform ◽  
2010 ◽  
Vol 22 (19) ◽  
pp. no-no
Author(s):  
P. H. DIXNEUF ◽  
C. BRUNEAU ◽  
J. FOURNIER
Keyword(s):  
Carbon Dioxide ◽  
Organic Compounds

Manganese Oxide Photodeposited onto Titanium Dioxide as a New Environmental Catalyst

2005 ◽  
Vol 480-481 ◽  
pp. 117-122 ◽  
Author(s):  
Ayumu Tateoka ◽  
Yoshika Sekine ◽  
Takamasa Tsuda ◽  
Takanobu Ohashi
Keyword(s):  
Carbon Dioxide ◽  
Titanium Dioxide ◽  
Manganese Oxide ◽  
Organic Compounds ◽  
Uv Irradiation ◽  
Room Temperature ◽  
Complex Oxide ◽  
Environmental Catalysis ◽  
Environmental Catalyst ◽  
Formaldehyde In Air

Authors have successfully synthesized a new environmental catalysis which reacted with harmful formaldehyde in air at room temperature. Although manganese oxide is practically used for a major ingredient of formaldehyde removing materials, intermediates such as formate formed on the surface reduced the removal efficiency. Then, manganese oxide was photodeposited onto the surface of titanium dioxide particles which could decompose certain organic compounds with UV irradiation. It was confirmed that the complex oxide decomposed formaldehyde into carbon dioxide at room temperature. Moreover, UV irradiation enhanced the production of the carbon dioxide.

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