Method of increasing efficiency of aerobic waste water treatment

FIELD: chemistry.

SUBSTANCE: invention can be used in biological and physical-and-chemical treatment of waste water or in industrial water supply. The method is realised via aeration, sorption and oxidation of contaminants in starting waste water on charge material. The charge material used is dispersed natural schungite mineral which is added at the same time as the waste water to be treated and/or into an aerobic bioreactor. Contaminants are oxidised by dissolved oxygen directly on the surface of schungite and by microorganisms immobilised on the charge material.

EFFECT: high efficiency of treatment.

2 tbl, 2 ex

 

The invention relates to the field of wastewater treatment aeration and can be used in biological and physico-chemical wastewater or industrial water supply.

The known method of aerobic biological treatment of wastewater in the bioreactor with immobilized microorganisms. As the boot process efficiency aeration and microbial oxidation of contaminants in the bioreactor using quartz sand, dolomite material, activated carbon, solid substrates coal (Application Germany N 3917595, CL C02F 3/06, 1990).

A disadvantage of the known method are the increased costs due to the low concentrations of dissolved oxygen due to the use of insufficient downloads, which requires greater power consumption for additional aeration.

There is also known a method of aerobic wastewater treatment carried out in the presence of the rolling carrier of microorganisms in the form of a porous polymer or copolymer material containing 5-60% activated carbon with a density less than a density of the flowing cleaning liquid with activated sludge and aeration oxygen-containing gas with the subsequent removal of the aeration tank treated water and free of sludge and holding him as carriers of microorganisms developed NAU is but-production environmental enterprise "Ecopolis" (Patent of the Russian Federation 2039013 C1, C02F 3/08, 1992).

The disadvantage of this method of water purification for the Patent of the Russian Federation 2039013 C1 are higher costs for the process due to its high content (5-60%) rolling carrier of microorganisms in the form of activated carbon and the need for subsequent discharge from the sludge mixture and return to the process.

Closest to the proposed method is a method of aerobic wastewater treatment by adsorption and oxidation of immobilized microorganisms in the suspended layer of the boot material in the form of coal, clinoptilolite, crushed limestone and other (RF Patent 2079447, C02F 3/02, 1994).

The disadvantage adopted for the prototype method aerobic wastewater treatment are increased costs for the implementation of the whole process, due to the use of inefficient and costly downloads.

The purpose of the claimed invention - improving the efficiency of the process of aerobic wastewater treatment by reducing costs for aeration.

This objective is achieved in that in the known method of aerobic wastewater treatment, including the supply of wastewater, aeration, sorption and oxidation of impurities on the boot material as the boot material dispersed use natural mineral shungite, which is introduced simultaneously with the purified waste water and/or in eobny bioreactor, and oxidation of the contaminants are dissolved oxygen directly on the surface of shungite and immobilized on the boot material by microorganisms.

The method is as follows.

Raw water containing impurities, is fed into the aeration zone. In the source water or directly in the aeration zone is entered dispersed boot material in the form of natural material shungite. In the zone of aeration is the sorption and oxidation of contaminants dissolved oxygen directly on the surface of shungite and immobilized on the boot material by microorganisms.

Example 1. Water contaminated with inorganic compound, sodium sulfite, having a pH of 7.5 and temperature of 20C, were subjected to purification by aeration in the aerobic reactor of 300 DM3when the height of the water layer of 0.45 m and air flow rate Q=130 l/min by the claimed method and manner of the prototype. Purification of water from sodium sulfite were at a concentration of boot materials 1.0 g per 1 l, with the introduction of them into the bioreactor.

Evaluation of the effectiveness of the process led by the ratio of mass transfer of oxygen and the cost of the boot material (table 1).

Table 1
Indicators of process wastewater is water aeration from inorganic impurities
NameWastewater treatment method with the boot material
declareprototype
shungitewithout downloadingLecaclinoptiloliteasset-th coal
The mass transfer coefficient, h-115.6111.567.208.175.36
The cost of loading, RUB/t32000-150002460085000

The inventive method (table 1) mass transfer coefficient effective way with the boot material for the prototype. Cost of the boot material costs are higher on the clay and activated carbon, than shungite, but lower than on the sand. The way with stones on the mass transfer coefficient effective way to prototype with expanded clay (15.61/7.2) at 2.17 times. This means that to achieve an equal effect with the claimed method is trebuetsya in 2.17 times more load on the prototype, ie (2.1715000) 32550 rubles, i.e. the cost of materials, the inventive method is more effective because it corresponds to the purpose of the invention is to increase the efficiency of the process of aerobic wastewater treatment by reducing costs for aeration.

Example 2. Domestic waste water after grates and sand trap having a pH of 7.5 and temperature of 20C, were subjected to purification in the aerobic reactor of 300 DM3when the height of the water layer 0.45 m and air flow rate Q=130 l/min with a biomass concentration of 2 g/l of dry matter of the claimed method and manner of the prototype. Treatment is conducted at a concentration of boot materials 1.0 g per 1 liter when introducing them in the original wastewater. The process evaluation conducted on the amount of dissolved oxygen at a cost of 1 kilowatt hour of electricity (table 2).

Table 2
The amount of oxygen produced during the purification of domestic wastewater at 1 kilowatt hour of electricity
NameWastewater treatment method with the boot material
declareprototype
shungitewithout downloadingLecathe sandasset-th coal
Oxygen, KGO2/ kWh0.10.0570.0500.0470.021
Efficiency (shungite / other material)11.752.02.134.77

From the data of table 2 should significant economic efficiency of the energy costs for implementation of the proposed method, which is also consistent with the objectives of the invention.

The way aerobic wastewater treatment, including the supply of wastewater, aeration, sorption and oxidation of impurities on the boot material, characterized in that as the boot material dispersed use natural mineral shungite, which is injected simultaneously with the purified waste water and/or aerobic bioreactor, and the oxidation of the impurities are dissolved oxygen directly on the surface of shungite and immobilized it by microorganisms.



 

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