LV11308B - Equipment for treatment of sewage containing oil products - Google Patents

Abstract

This invention pertains to high-productivity equipment for cleaning wastewater containing oil products. It consists of a vertical reservoir covered with a lid, with a taper-shaped lower part (fig.1). The equipment is divided into three functional compartments: for sedimentation, filtration and residue accumulation, which are located in the same reservoir and separated with partitions. High cleaning efficiency is achieved by using thin-layer modules in the sedimentation compartment, and proper sorbents for respective wastewaters, which are periodically exchanged and regenerated, in the filtration compartment. The simple design reduces installation and maintenance charges.<IMAGE>

Description

Oil - based waste water treatment plant

The plant deals with the treatment of wastewater containing various concentrations of petroleum products. The object of the invention is to intensify wastewater treatment, to reduce the space required for the installation, to reduce construction and operating costs.

In certain situations technological solutions for the treatment of waste water containing petroleum products

In some technological processes, as well as in petrol tanks and containing wastewater that is often present in the effluent after car washing, the concentration of elevated oil products is sufficient to prevent it from being treated in biological sewage treatment plants. In such cases, various sorbents may be used to reduce the concentration of petroleum products, which are usually subsequently regenerated by simply separating the floating petroleum layer before sorption.

The settler-filter described in SU patent 1 ^ 58015 has been selected as a prototype of the structure for purification of oil-containing waste water. It is divided by partitions into several tanks, each of which is divided into two in order to provide both upstream and downstream waste water. Upstream flows contain interchangeable regenerative filters. At the bottom of each tank a sludge removal is provided. A disadvantage of the plant is the removal of sediment at several sites, even after filtration. In addition, there is no provision for the collection of the petroleum floating fraction separately and through the filters / 1 /.

The apparatus described in SU patent 1758012 is intended to separate both the floating oil fraction and η

sludge deposited on thin-layer sediments using air bubbling to intensify the process, but without filtration or sorption of pollutants that are difficult to float and settle / 2 /.

SU patent 1699941 also provides for the separation of floating and sinking fractions, as well as the use of a filter, while the equipment produces multiple locations for oil and sediment removal and control of the filter / 3 /.

Summary of the Invention

The present invention provides a simpler construction of a plant for treating petroleum-containing wastewater than the analogs mentioned above, while providing both lighter and heavier fraction separation and additional sorbent purification of the wastewater.

The proposed equipment consists of a cylindrical reservoir with a conical bottom. The reservoir is equipped with pipes for wastewater inlet and outlet, oil removal, sludge drainage, ventilation and level control. Settling and filtration tanks separated by a cylindrical partition. In the settling tank, the separation of petroleum products and suspended solids takes place in thin-layer plastic modules. Separated petroleum products float up and periodically

The filtration tank contains adsorbent waterproof bags with sorbent. The presence of the sorbent in the bags facilitates its periodic replacement.

FIG. 1 depicts an apparatus according to formula 2. Contaminated effluent is fed through pipe 1 and T-pipe coupling 2 into a settling tank 3 below the liquid level, which prevents their mixing with the settled petroleum products in the settling tank. The hopper is located between the cylindrical housing 17 and discharged. filling:

and cylindrical bulkhead 11. With high hydraulic resistance of the filter 4, a uniform fluid level is achieved along the perimeter of the settler over the separation thin film modules 5. Oil products form a floating layer 6 and are periodically discharged through a pipe 7. The discharge of waste water is interrupted. and the liquid level in the settling tank 6 equals the liquid level above the filter. The suspended substances, after the separation vessel 5, are gravitationally deposited in the cone 9, but the effluent flows into the filtration vessel 10, which is separated from the settling vessel 3 by a septum 11. In the filtration vessel 10, the filter 4 is formed by sorbent filled bags held by a sieve 18. The sedimented and filtered effluent leaves the plant through a pipe 12 whose T-shaped connection 13 prevents oil from floating above the liquid level 14. Vertical duct 15 for venting in tank cover 8. The bottom of the cone 9 is equipped for sludge removal.

for pipe 16

Information sources [1] SU patent 1758015.

[2] SU Patents 1758012.

[3] SU patents 1699941.

Claims (1)

Formula of the Invention 1. The purification unit in a reservoir of 3 effluent containing oil, which has a vertical cylindrical conical bottom and which has functional tanks for partitioning: settling, filtration and sludge storage, is characterized in that all 3 functional tanks are in one tank. 2. The apparatus of claim 1, wherein the settler is formed from thin-layer plastic laminated modules to intensify the settling process.