Coal mine domestic wastewater treatment device and treatment method

Abstract

The invention provides a coal mine domestic wastewater treatment device and a treatment method. The coal mine domestic wastewater treatment device comprises a grille well, an adjustment tank, a pre-sedimentation tank, and a simultaneous biological oxidation tank (SBOT), wherein the grille well, the adjustment tank, the pre-sedimentation tank, and the SBOT are orderly communicated along a coal mine domestic wastewater flow direction. The SBOT is separated into N little tanks along a direction perpendicular to the bottom of the SBOT. Each one of the N little tanks is provided with an upper flowchannel, carriers intercepted by an upper carrier interception grille and a lower carrier interception grille and a lower flow channel close to the bottom of the SBOT, wherein an aerated pipe is arranged between the lower carrier interception grille and the lower flow channel and a dredge pipe is arranged at the bottom of the SBOT and is communicated with the outside environment. The coal mine domestic wastewater treatment device and the treatment method can effectively reduce the content of organic matters in coal mine domestic wastewater, the content of ammonia nitrogen in coal mine domestic wastewater and the content of total nitrogen in coal mine domestic wastewater, avoid the use of a secondary sedimentation tank and an activated sludge backflow system, greatly simplify coal mine domestic wastewater treatment processes, and reduce coal mine domestic wastewater treatment device costs.

Description

technical field [0001] The invention relates to domestic sewage equipment and a treatment method, in particular to coal mine domestic sewage treatment equipment and a treatment method. Background technique [0002] With the continuous strengthening of people's awareness of environmental protection, most of the domestic sewage will be discharged into the environment after a series of treatments to make the organic content, suspended solid concentration and ammonia nitrogen content meet the standards. [0003] With the continuous development of my country's coal industry, the discharge of domestic sewage from coal mines (including coal mine dormitories, bathhouses, canteens, office buildings, etc.) is also increasing. Compared with urban domestic sewage, coal mine domestic sewage generally has the following characteristics: Its organic content is low, pH is 7.3-8.3, CODcr is 50-250mg·L -1 , SS concentration of suspended solids is 50-200mg·L -1 , ammonia nitrogen is 10~35mg·L ...

AI Technical Summary

Problems solved by technology

[0004] There are two main existing methods for treating domestic sewage in coal mines: activated sludge method and biofilm method. When using the existing activated sludge method to treat domestic sewage in coal mines, it is generally necessary to use a secondary settling tank for the outflow from the aeration tank. The mixed liquid is separated from mud and water, the supernatant is discharged, part of the concentrated activated sludge is returned to the aeration tank, and the rest is discharged to the sludge concentration tank as surplus sludge. The process system is complex, requires high automation, and occupies a large area. , the project investment and operation cost are high, and the treatment effect of ammonia nitrogen in sewage is not good by using activated sludge method

[0005] When using existing biofilm methods such as: biological contact oxidation process and biological aerated filter process to treat coal mine domestic sewage, the biological contact oxidation process sets fillers in the contact oxidation tank to make microorganisms grow on the surface of the fillers in the form of biofilms. To treat sewage, although it does not require sludge reflux and has no sludge bulking problem, its operation and management are simpler than the activated sludge method, but its water distribution and aeration are prone to unevenness, and at the same time, it needs the secondary sedimentation tank to settle and fall off biological Membrane and flocculent sludge have high project investment and operating costs. Although the biological contact oxidation process can effectively remove the content of organic matter in sewage, the removal rate of ammonia nitrogen and total nitrogen in sewage is low

[0006] Compared with the ordinary activated sludge process, the biological aerated filter process does not produce sludge bulking and does not require subsequent sedimentation tanks (secondary sedimentation tanks), which saves investment in equipment and has better effluent quality, but it is harmful to influent SS Strict requirements (generally SS≤100mg / L, preferably SS≤60mg / L), influent water needs to be pretreated, and regular backwashing is required, the backwashing water volume of the filter material is large, and the water head loss is large

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