Zero-emission gravel production wastewater treatment system and process

Abstract

The invention provides a zero-emission gravel production wastewater treatment system and a process applied to the system. The system comprises a sedimentation tank, the sedimentation tank is provided with a sand scraper and a sand pump, an outlet of the sand pump is connected with a sand washer, an outlet of the sand washer is provided with a dewatering screen, and the dewatering screen is connected with a sand silo; the middle of the sedimentation tank communicates with a sewage well, the bottom of the sewage well pumps sewage to a vertical flow clarifier through a first slurry pump, the upper portion of the vertical flow clarifier is connected with a high-efficiency rapid separator, the upper portion of the high-efficiency rapid separator is connected with a clean water tank, and the lower portions of the vertical flow clarifier and the high-efficiency rapid separator are respectively connected with a sludge tank; and the bottom of the sludge tank pumps the sludge to sludge drying equipment through a second slurry pump. Fine sand recycling is achieved, and the gravel production cost is saved; sewage is subjected to multi-stage treatment, so that the water treatment cost is saved; and clear water recovery and sewage zero discharge are realized, the water taking cost is reduced, and the environment is protected.

Description

technical field [0001] The invention relates to the technical field of sandstone aggregate production wastewater treatment, in particular to a zero-discharge sandstone production wastewater treatment system and process. Background technique [0002] In construction engineering, when the stone powder content of sand and gravel aggregate is too high, the water consumption will increase, and there will be free in the concrete or at the interface, resulting in a decrease in the strength of the concrete. Therefore, construction projects have certain restrictions on the maximum stone powder content of sand and gravel aggregates. During the sand and gravel production process, the stone powder content of the crushed raw sand is relatively high, far exceeding the maximum stone powder content requirement of the sand and gravel aggregate. In addition, the surface of gravel and bean stone is coated with a large amount of powder, which will easily lead to free interfaces and reduce the ...

AI Technical Summary

Problems solved by technology

If the treatment is not timely, it will cause the sewage tank to be unable to accommodate the excess mud water, unable to keep up with the production progress, resulting in shutdown

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