General biological treatment

Tire COD load in general biological purification is reduced on the average from 11 to 1.5 t per day, i.e. an efficiency of around 88%. 

1 i Biological purification inlet Tertiary treatment p outlet r 

These values are given for purposes of illustration and comparison and represent averages over nine months. 

6 mEATMehTT CASE STUDIES. PURIFICATION MONITORING AND SLUDGE DISPCSAt. 

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The "North" effluent goes through an API oil separator and is sent partly to physicochemical purification (DAF). The rest is sent directly to general biological treatment except if there is an accident, it is sent to the site s physicochemical purification process. 

There are two methods of biological treatment aerobic and anaerobic (217). The aerobic systems use free oxygen dissolved in the wastewater to convert wastes in the presence of microorganisms to more microorganisms, energy required for their existence, and carbon dioxide. The anaerobic process occurs in the absence of free oxygen and converts the waste to methane and carbon dioxide, generally in deep tanks or basins, and can produce odor problems when sulfides or sulfates are present in the wastewater. 

Temperature and Humidity When adsorption, absorption, or condensation is employed, the lowest inlet gas temperature is desirable. Adsorbent and absorbent capacities generally increase with the decreasing gas temperature. High waste-gas temperatures may preclude the use of adsorption or condensatit)n due to the cost of chilling. Thermal and catalytic oxidation benefit from a hot effluent gas stream, as that reduces the supplementary fuel requirement. In biological treatment, a waste-gas temperature of near 37 °C is ideal. 

THE IMPROVED BIOLOGICAL TREATMENT SYSTEM 27.3.1 General Principles and Process Description... 

It is recommended that FOG separation be installed because of the high amount of FOG in food wastewater. Generally, FOG can be separated and recovered for possible use or for easy biological treatment in the future. Figure 30.3 shows one FOG separation and recovery system.11... 

All facilities operating under Interim Status are subject to a number of general facility standards. In addition, specific standards have been established for management of wastes in containers, tanks, surface impoundments, waste piles, landfarms, landfills, incinerators, and chemical, physical, and biological treatment facilities. 

Generally, wastewater treatment methods can be broadly classified into biological, physical (i.e. mechanical) and chemical [3, 12-14]. Biological... 

Organic pollutants are generally found to be reduced to insignificant levels (<10 p-g/L) by biological treatment. Most metals are also found to be reduced across biological treatment they are generally at very low levels in the treated effluent. However, significant metal concentrations may be found in some treated effluent. 

Liquid-phase adsorption using GAC is one of the most widely used remediation technologies. The major disadvantage of this approach is that it simply transfers contaminants from one phase to another, and further treatment or disposal of the receiving phase is typically required. Biological treatment has the potential to completely destroy contaminants, and it is generally... 

Biological Treatments. The possibility of using biological treatments to increase the permeability of wood has received considerable attention by researchers. In general, this type of treatment can be separated into 3 categories namely, a) treatment with fungi, b) treatment with bacteria, and c) enzyme treatments. 

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