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Process for treating sewage with zeolite filler in aerated biologic filter pool and zeolite filler

A technology of biological aerated filter and filter material, which is applied in the field of zeolite filter material and biological aerated filter of zeolite filter material to treat sewage. It can solve the problems of reducing the effective use time of equipment, reduce the cost of the filter tank, and resist the impact of ammonia nitrogen. Strong load capacity and good effect

Inactive Publication Date: 2002-09-18
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it needs to be stopped for special regeneration after running for a period of time, which reduces the effective utilization time of the equipment.

Method used

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  • Process for treating sewage with zeolite filler in aerated biologic filter pool and zeolite filler
  • Process for treating sewage with zeolite filler in aerated biologic filter pool and zeolite filler

Examples

Experimental program
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Embodiment 1

[0024] Treatment of low-concentration domestic sewage: choose a particle size of 4-6 mm and a density of (1900-2100) kg / m 3 , the hardness is Mohs hardness 4~5, and the ammonia ion exchange capacity is (3~4)kg / m 3 . When the COD in the sewage is (80-120) mg / L, and the ammonia nitrogen is (10-15) mg / L, the water-air ratio is 1:2-1:3, the height of the filter material is (2-3) m, and the hydraulic load (2~4)m / h; this process adopts air-water combined backwashing method, and the air flushing intensity in the first stage is (15~18)L / (m 2 s), flushing time (3~7)min; second stage air flushing intensity (15~18)L / (m 2 s), the water flushing intensity is (10~12)L / (m 2 s), the flushing time is (10-15)min; the third-stage water rinsing intensity is (10-12)L / (m 2 s), time (5-10) min. The removal rate of suspended solids is about 90%, the removal rate of COD is about 80%, and the removal rate of ammonia nitrogen is 80-90%.

Embodiment 2

[0026] Advanced treatment of domestic sewage: choose a particle size of (3-4) mm and a density of (2000-2200) kg / m 3 , the hardness is Mohs hardness 3~4, and the ammonia ion exchange capacity is (5~6)kg / m 3 . When the COD in the sewage is (40-90) mg / L, and the ammonia nitrogen is (15-40) mg / L, the water-air ratio is 1:1-1:2, and the hydraulic load is (4-6) m / h. The material height is (2-4) m. This process adopts the air-water combined backwashing method, and the air flushing intensity in the first stage is (12~15)L / (m 2 s), flushing time (3~7)min; second stage air flushing intensity (12~15)L / (m 2 s), the water flushing intensity is (8~10)L / (m 2 s), flushing time (10-20) min; the third-stage water rinsing intensity is (8-10) L / (m 2 s), time (5-10) min. The removal rate of suspended solids is about 90%, the removal rate of COD is about 70-80%, and the removal rate of ammonia nitrogen is 90%.

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Abstract

A process for treating sewage zeolite as filter material in aerating biological filter pool is disclosed. It features that the life sewage to be treated contains COD (40-120 mg / L) and ammonacal nitrogen (10-40 mg / L), the height of filter material is 2-4 m, hydraulic load is 2-5 m / h, the intensity for pneuamtic-hydraulic counter-flushing is 12-18L / sq.ms, the water flushing intensity is 8-12 L / sq.m.s, and the water rinsing intensity is 8-12 L / sq.ms. The zeolite has 3-6 mm for granularity, 1900-2200 Kg / cu.m for density, 3-5 for Mohs'hardness and 3-6 kg / cu.m for ammonia ion exchange capacity. Itsadvantages are high effect and high impact resistance.

Description

technical field [0001] The invention relates to a low-concentration domestic sewage recycling treatment and domestic sewage advanced treatment technology, in particular to a method for treating sewage in a zeolite filter material aerated biological filter tank and the zeolite filter material. Background technique [0002] There is currently no suitable method for the reuse and treatment of low-concentration domestic sewage. If biological treatment processes such as activated sludge method and biological contact oxidation method are used, the treatment efficiency is low due to the low organic matter load, and secondary sedimentation is required, so the treatment cost is high. In addition, the effect of ammonia nitrogen removal is poor, and the effluent is difficult to reach the sewage. Reuse as a requirement of circulating cooling water quality standards. If physical and chemical processes such as coagulation, sedimentation, and filtration are used, ammonia nitrogen cannot b...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F3/02C02F3/04C02F3/08C02F3/10C02F3/34
CPCY02W10/10
Inventor 田文华文湘华钱易
Owner TSINGHUA UNIV
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