BG98773A - Method for the neutralization of wastes polluted by oil products - Google Patents

Abstract

The method for neutralizing petroleum - polluted waste products through degradation under aerobic conditions consists of the following. To the subjects of treating polluted waste in a ratio of 1 to 0.5 -1 wt. is added a mixture, comprising from 5 to 20 mixture of bacteria, from 4 to 40 clay and / or peat, from 20 up to 40 compost, 10 to 15 fertilizer and 0.1-5 petroleum product absorbent. The mixture c is homogenized, the remaining 97-90 parts by weight are added. contaminated with oil waste products and the resulting mixture aged in piles, preferably in for 6-8 days. To 100 wt. of the mixture c is added 1.5-2.5 wt. From another a mixture consisting of 70 to 80% by weight. Grape marc, 10-15% wt. Bird manure and 5- 10% wt. a mixture of bacteria. Following is the homogenization and clustering of stacks, which for at least 80 to 120 days. It is recommended that the mixture is turned over aging time.

Description

The present invention relates to a method of neutralizing oil-contaminated wastes under aerobic conditions.

Neutralization of petroleum-contaminated occurrence, sludge or other wastes is a major worldwide problem.

The neutralization of petroleum-contaminated waste by biological methods has been reported in an article (Enzyme and Microbial Technology, Vol. 6, No. 4, pp. 146-154).

Another biodegradation method for neutralizing oil contaminated waste is described in Hungarian Patent No. 174,531. In this method, the contaminated waste is mixed with the topsoil and turned permanently with the soil. Soil microorganisms are involved in the degradation of petroleum products, which continues to be converted to 60 to 30 percent for six or seven months.

This procedure is too lengthy and there is none

- 2 what other disadvantages, such as that the sedimentation can lead to filtration of the polluting petroleum product, or that the extent and rate of degradation depend on the composition of the soil.

In another method, oil-contaminated waste is mixed with natural fertilizer in which microorganisms break down the oil product. This method is also too lengthy and lacking in selectivity.

In a similar method, petroleum-contaminated waste is mixed with municipal waste containing micro-organisms capable of breaking down petroleum products. This method is also disadvantageous because of the length of time it takes - degradation takes a year or more. Moreover, due to the relatively small amount of oil contaminated waste in the total large volume of municipal waste, controlling the degree of degradation and even representative sampling is too difficult.

We have conducted experiments to develop a new method that can eliminate the disadvantages of the above mentioned procedures.

We have found that the treatment of petroleum-contaminated wastes with a mixture consisting of a special mixture of bacteria embedded in a clay or peat carrier base, as well as natural and artificial fertilizer, and then another mixture is added to this system, containing races

- 3 titanium pulp and a mixture of bacteria, which stimulate the ability of the bacteria in the first mixture to break down five roll products, provides a new method for more selective and faster degradation of petroleum products than previously known methods.

The method according to the present invention provides the degradation of 85 to 99% by weight of the content of petroleum products in the waste within 3 or months, as well as increasing the humus content in the soil, which was previously contaminated with petroleum products.

Therefore, this invention provides a new method for the decomposition of petroleum-contaminated wastes under aerobic conditions.

The method according to the present invention consists in adding a mixture of 1 to 0.5-1 parts by weight to 3-10 parts by weight of the contaminated waste to be treated, said mixture comprising

5-20 wt.% Mixture of bacteria, 4-40 wt.% Clay and / or peat, 20-40 wt.% Compost, 10-15 wt.% Manure and 0.1 wt.% Absorbent of petroleum products, followed by homogenization of the mixture, adding the remaining 97-90 parts by weight of contaminated waste and then storing the mixture in piles, recommended for 6-8 days, followed by addition

- 4 wilts of 1.5-2.5 parts by weight of another mixture consisting of 70-80 weight percent of grape marc, 10-15 weight percent of poultry manure and 5-10 weight percent of bacteria to 100 parts by weight of said mixture, and after homogenizing and piling up the storage heaps for at least 80-120 days, during which time it is advisable to turn the mixture twice every 6-7 days at the beginning and once every 2022 days thereafter.

For the purposes of the present invention, a mixture of Achrobacter sp. (ATCC 21910), Arthrobacter sp. (ATCC 21908), Pseudomonas sp. (ATCC 21409), Nocarda globorala (ATC 21505C Rhodococcus sp. (ATCC 21499) Ce Moisture B OCHOBa-HO clay and / or peat-filler. This special mixture of bacteria is highly effective in decomposing all types of waste contaminated with petroleum products.

The bacterial stimulating mixture consists of Chatemoium cellulolyticum (ATCC 32319), Humicola grisea (ATCC 16298), Trichoderma harzianum (ATCC 42832), ¹ Streptomyces thermophilus (ATCC 19282), Bacillus circulans (ATCC 9500).

Suitable c / n and c / p ratios for degradation are provided by the additional constituents of the mixtures containing the bacterial species mentioned above.

The following examples illustrate the method of the present invention:

- 5 EXAMPLE 1

Thirty cubic meters of soil containing 2.1% by weight of humus and contaminated with petroleum products 90 g / kg was poured into a fenced tank raised 50-60 cm above ground level and surrounded by a moat.

Of contaminated soil with petroleum products were withdrawn 1.5 t ³ (with a bulk density of 1,3 t / m ³ and were mixed with a 1 metric ton bacterial mixture consisting of 5 weight percent bacteria (Achromobacter sp., 'Pseudomonas sp . , Nocarda globorala, Arthrobacter sp., Rhodococtis sp.) Weight percent clay, 32 weight percent peat, 35 weight percent compost, 15 weight percent nitrogen and phosphorus fertilizer and 5 weight percent zeolite.

The mixture was homogenized and the moisture content was adjusted to 50% by weight.

After four days of standing in order to multiplication of bacteria, the mixture was distributed evenly over the remaining 28,5 z ³ of the underlying processing material.

The whole mass was then inverted with an excavator and accumulated in piles of prism 3 m wide and 0.5 m high for one week.

The accumulated material was mixed with 600 kg of bacteria-stimulating mixture using an excavator. The stimulating mixture consisted of 75 percent by weight of marc, 15 percent by weight of bird manure, and 10 percent by weight of the bacterial mixture (Chatemoium cellulolyticum, Humcola-o-grizea, Trichoderma harzanium, Streptomyces thermophillus, Bacillus circulans).

Thereafter, the mixture was accumulated in prism-shaped piles of 3 _m wide and 0.5 _{m high} and inverted twice a week for the first 14 days and once every 3 weeks for 2 months.

After 4 weeks, the content of oil pollutants was reduced to 2.7 g / kg and to 0.08 _g / kg at the end of the fourth month, while the humus content was increased to 3.5 wt%.

EXAMPLE 2

An oil contaminated sludge containing 214 g / kg was placed in the tank of Example 1.

The procedure of Example 1 was carried out, but the mixture containing the degrading bacteria bacteria consisted of 4 wt.% Of the bacterial mixture w in Example 1, 5 wt.% Clay, 35 wt.% Peat, 30 wt.% Compost, 15 wt. , 5 wt.% Zeolite and 6 wt.% Water.

The composition of the stimulus mixture was as follows:

weight percent of the bacterial mixture in Example 1, weight percent of grape marc and 15 weight percent of bird manure.

Four weeks after processing, the contents of

- 7 oil pollutants were reduced to 28 _g / kg and at the end of the fourth and six months the content of petroleum products was 4.2 g / cd and 0.9 g / kg, respectively.

Claims (2)

1. A method for neutralizing petroleum-contaminated waste by aerobic decomposition, comprising adding a mixture of 1 to 0.1-1 parts by weight to 3-10 parts by weight of the waste to be treated, such as said mixture consists of 5-20% by weight of a mixture of bacteria, 4-40% by weight of clay and / or peat, 2040% by weight of compost, 10-15% by weight of artificial fertilizer and 0.1-5% by weight of oil absorbent, followed by homogenizing the mixture, adding residual 97-90 parts by weight of oil contaminated waste and then settling of the mixture in heaps for 6-8 days, followed by the addition of 1.5-2.5 parts by weight of another mixture consisting of 70- 80% by weight of grape marc, 10-15% by weight of poultry manure and 5-10% by weight of bacterial mixture to 100 parts by weight of said mixture, after homogenization and accumulation of piles for at least 80-120 days, it is advisable to turn the mixture during aging. 2. The method of claim 1, wherein the moisture content of the oil-contaminated waste is corrected up to 50 weight percent prior to piling up.