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Two-section type reinforced denitrification multistage soil percolation system

A soil infiltration, two-stage technology, applied in the field of sewage treatment system, can solve the problems of large chemical pollution, low denitrification rate, chroma, total nitrogen removal rate, etc., and achieve the effect of high denitrification rate

Active Publication Date: 2016-04-20
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the denitrification process needs to consume organic carbon sources, the MSL system has low nitrogen removal efficiency for some sewage with relatively low carbon and nitrogen, mainly due to the impact of insufficient carbon sources.
The existing technology mainly adds natural carbon sources such as sawdust, corncobs, and kenaf to the modules in the system, but such natural carbon sources have low denitrification rate and chromaticity; Transport a certain flow of untreated raw water to supplement the organic carbon source to partially improve the denitrification efficiency; in addition, under the condition of excessive aeration and oxygenation, the denitrification process is inhibited to a certain extent, and the total nitrogen removal rate will be affected to a certain extent
Generally speaking, the deep denitrification efficiency of the MSL system has not yet been optimized and maximized.

Method used

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  • Two-section type reinforced denitrification multistage soil percolation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In this example, the two-stage enhanced denitrification multi-stage soil infiltration system provided by the present invention is used to treat sewage from a heavily polluted urban river. The water quality characteristics of the sewage are: COD Cr 42.85~173.86mg / L, ammonia nitrogen 11.89~39.40mg / L, total nitrogen 19.07~48.00mg / L, total phosphorus 1.37~3.43mg / L.

[0029] In this example, the length, width and height of the aeration section and the non-aeration section of the two-stage enhanced denitrification multi-stage soil infiltration system are respectively 0.4m, 0.3m and 1m, and the hydraulic load is 0.1-0.5m 3 / m 2d. The percolation layer (PL) filler in the aeration section is large-grained natural zeolite with a particle size of 5-10 mm; the mixed module layer (ML) is made of pottery sand, limestone, steelmaking blast furnace washing slag, sawdust, and charcoal according to the dry weight ratio of 30 : 40: 10: 10: 5: 5 are evenly mixed, and a total of 5 layer...

Embodiment 2

[0033] In this example, the two-stage enhanced denitrification multi-stage soil infiltration system corresponding to Example 1 is used to treat the tail water of a certain sewage treatment plant. Typical characteristics of level A emission standards: CODCr30~50mg / L, ammonia nitrogen 3~8mg / L, total nitrogen 10-15mg / L, total phosphorus 0.1~0.5mg / L.

[0034] The hydraulic load is 1.0-2.0m 3 / m 2 d. Under the condition of gas-water ratio of 3-5:1, the system can run stably, and the removal effect of pollutants is good. The average removal rates of COD, TN, TP, etc. are respectively above 65%, 90%, and 70%. The main conventional water quality indicators basically reach above the limit value of Category IV in the Environmental Quality Standard for Surface Water GB3838-2002.

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Abstract

The invention discloses a two-section type reinforced denitrification multistage soil percolation system, comprising a front-section system and a rear-section system. The front-section system is an aerating aerobic open tank body and comprises a water inlet tank, an intake water distributor, a percolation layer, a hybrid module layer, a bottom cushion layer, a bottom drainpipe and an aeration system; the rear-section system is a non-aerating anoxic enclosed tank body and comprises an intake water distributor, a percolation layer, a hybrid module layer with novel solid-phase carbon source, a bottom cushion layer and a bottom drainpipe; the front-section system and the rear-section system are connected via a connecting pipe; and the vertical height of the two tank bodies is 20 to 50 cm. The two-section type reinforced denitrification multistage soil percolation system enables nitrification and denitrification to be independently carried out in different environments, so denitrification effect can be reinforced; since a degradable polymer is used as the novel solid-phase carbon source, the system has the substantial advantages of a high denitrification rate, no chroma influence on effluent and the like; and the system is low in infrastructure cost, stable in operation effect and convenient to maintain.

Description

technical field [0001] The invention relates to a sewage treatment system, in particular to a two-stage enhanced denitrification multi-stage soil infiltration system. Background technique [0002] The land treatment system is a treatment technology based on the "soil-plant-microbe" system to purify sewage. It has low investment and low operating costs, and has been widely used in many fields such as domestic sewage, improvement of river and lake water quality, and non-point source pollution control. , has a good effect on organic matter removal and is economical. However, there are many defects in the traditional land treatment technology, such as low hydraulic load, low treatment capacity, easy to block, etc., which limits its application scope to a certain extent. [0003] Multi-level soil infiltration system (Multisoillayering system, MSL) is a new type of high-efficiency artificially enhanced soil infiltration system developed by Japanese scholars in the 1990s for the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/34C02F101/10C02F101/16
CPCC02F3/308C02F3/34C02F2101/105C02F2101/16
Inventor 吴为中吴浩恩魏才倢
Owner PEKING UNIV
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