A kind of ecological green land sewage treatment system and its method

Abstract

The invention relates to an ecological green space sewage processing system. The system is characterized in that a regulating tank, an ecological green space tank, and a vertical sustain-released feed pipe are communicated with each other in sequence. The invention also provides a processing method of the ecological green space sewage processing system. The processing method comprises the following steps: (1) making sewage go through the regulating tank to intercept the suspensions and fine sand particles; (2) after step (1), introducing the sewage into a water distribution system, then introducing sewage into the ecological green space tank, making sewage go through a water distribution layer, a rooting layer, a microbe growing layer, an adsorption layer, a buffer layer, and a water collecting layer in the ecological green space tank from bottom to top, and finally introducing sewage into a water collecting device; (3) collecting water; (4) discharging clean water. Compared with the prior art, the provided system and method have the advantage that in the microbe growing layer, the biomembrane method and artificial wet land technology are organically combined, biological filling materials are increased, so that microbes can be enriched on the filling materials and grow on the filling materials, the microbe membrane is fixedly attached on the filling materials, the microbes are immobilized; the aerobic and anaerobic environments are alternately changed, and the effect of microbes is enhanced.

Description

technical field [0001] The invention relates to a sewage treatment technology, in particular to a treatment system and method for efficiently denitrifying and dephosphorizing sewage by using an ecological green space system. Background technique [0002] With the rapid development of my country's economy, increasing population, gradually improving people's living standards, accelerating the pace of industrialization and urbanization, water consumption has increased sharply, and sewage discharge has also increased accordingly, which has exacerbated the shortage of fresh water resources and the pollution of the water environment. The aggravation of water environmental pollution has also led to the increasingly prominent problem of water eutrophication, so the requirements for nitrogen and phosphorus indicators in discharged sewage are also increasing. In my country's GB18918-2002 "Pollutant Discharge Standards for Urban Sewage Treatment Plants" released in 2002, the first-leve...

AI Technical Summary

Problems solved by technology

The main methods of tertiary (deep) treatment include ammonia stripping, coagulation precipitation, selective ion exchange to remove ammonia, sand filtration, precipitation dephosphorization activated carbon adsorption, ion exchange and electrodialysis, etc., but the above Most of these methods have the disadvantages of small processing capacity or high cost, numerous processing equipment, complicated maintenance, and some will cause secondary pollution

The traditional artificial wetland matrix is ​​mainly composed of soil, sand and gravel, etc. During the sewage purification process, relying on the huge specific surface area of ​​the matrix, a layer of biofilm is formed on the surface, and a small amount of microorganisms will be adsorbed in the gaps of the filter material of the biofilm. Therefore, microorganisms can remove organic matter and nitrogen and phosphorus in sewage by themselves, but the microbial content in the filter material is small, so the microbial action is limited. Excessive free microorganisms can easily lead to filter material blockage, thereby weakening the effect on dissolved solids and different pollutants in sewage. Therefore, in order to seek to design a constructed wetland substrate with high biofilm content, low substrate clogging, good thermal insulation performance and air permeability, an application number is 201410375798.8 (publication number is CN104118941A) The Chinese patent application "A Constructed Wetland Device for Efficient Nitrogen and Phosphorus Removal" provides a method for applying immobilized microorganisms in a constructed wetland system, which includes a constructed wetland pool, water inlet pipeline, aeration device and water outlet unit, and also includes a fixed The artificial wetland pool has 5 layers from top to bottom, which are: aerobic immobilized microorganism layer, gravel layer, steel slag layer, anaerobic immobilized microorganism layer and furfural slag layer; the aerobic immobilized An immobilized microbial plate is set in the microbial layer, and a water inlet pipeline consisting of a water inlet pipe and a water distribution branch pipe is arranged on the top of the immobilized sludge board. The water inlet pipe passes through the pool wall, and a liquid valve and a liquid flow meter are installed on the water inlet pipe. An aeration device consisting of an aeration main pipe and an aeration branch pipe is installed on the lower side of the immobilized microbial plate, the aeration main pipe passes through the pool wall, and a gas valve and a gas flow meter are installed on the aeration main pipe; The microbial layer is equipped with an immobilized microbial component, and an immobilized microbial plate is installed inside the immobilized microbial component; the water outlet unit is composed of a water outlet hole, a water collection tank and a water collection tank drain pipe, and a filter head is installed at the water outlet hole, and the water outlet unit is set The upper end of the constructed wetland pool is opposed to the pool wall where the water inlet pipe is located; the constructed wetland pool is constructed with a steel-concrete structure, and an anti-seepage layer is set on the inner side wall and bottom of the pool body; it combines immobilized microorganisms, microbial aerobic anaerobic treatment and The organic combination of constructed wetlands strengthens the role of microorganisms in constructed wetlands, effectively improves the efficiency of sewage treatment in constructed wetlands, occupies a small area, and has low investment costs

However, in the later stage of operation of the constructed wetland, due to the uneven water distribution, the passage rate will decrease, and the microorganisms in the matrix cannot grow normally. Normal growth, when the wetland substrate is saturated with organic matter, nitrogen, and phosphorus, the wetland treatment effect will be significantly reduced

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