Waste water treatment device and process for synchronously removing nitrogen and phosphorus of sludge concentration microenvironment

Abstract

The invention relates to a waste water treatment device for synchronously removing nitrogen and phosphorus of sludge concentration microenvironment, comprising an anaerobic pond, two anoxic ponds, two oxidation ponds, two sedimentation ponds, an internal reflux pump, an external reflux pump, pipelines, a dissolved oxygen control device, an inlet water carbon source distribution device, an internal reflux positive displacement pump and an external reflux positive displacement pump; the dissolved oxygen control device is provided with a dissolved oxygen controller B and a dissolved oxygen concentration meter; the inlet water carbon source control device is provided with a nitrate nitrogen-concentration controller A and a nitrate nitrogen concentration meter; and the waste water treatment device is further provided with an internal reflux control device and an external reflux control device. The process utilizing the waste water treatment device comprises the following steps of setting control data of a controller C of the internal reflux pump A; setting control data of a controller D of the external reflux pump B; setting control data of the dissolved oxygen controller B and the nitrate nitrogen concentration controller A; and opening an inlet water gate and all machines and electric control parts for running. The invention is suitable for waste water treatment, and has simple process, energy saving, low cost and high water outlet efficiency and good quality.

Description

technical field [0001] The invention belongs to a sewage treatment technology, in particular to the improved equipment and process of the anaerobic-anoxic-aerobic type, that is, the A / A / O sewage treatment technology. Background technique [0002] At present, the traditional A / A / O sewage treatment process is a widely used biological nitrogen and phosphorus removal process, which solves the problem of sewage nitrogen and phosphorus removal to a certain extent. With the increasing awareness of environmental protection in the society and the increasing shortage of water resources, the requirements for the quality of effluent from sewage treatment plants are getting higher and higher. The traditional A / A / O process mainly has the following problems: 1. Insufficient carbon source affects the phosphorus release in the anaerobic tank and the denitrification process in the anoxic tank. 2. Lower activated sludge concentration affects the stability of effluent ammonia nitrogen. 3. The...

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Problems solved by technology

The traditional A / A / O process mainly has the following problems: 1. Insufficient carbon source affects the phosphorus release in the anaerobic pond and the denitrification process in the anoxic pond

2. Lower activated sludge concentration affects the stability of effluent ammonia nitrogen

3. The processing load is limited by the sludge settling performance. Due to the slow speed of sludge settling, the processing load cannot be further increased

4. The denitrification effect is difficult to further improve due to the limitation of the reflux flow of nitrification liquid, that is, the internal reflux, and increasing the internal reflux will lead to insufficient carbon sources

The traditional A / A / O process often solves the problem of insufficient carbon sources by adding external carbon sources such as methanol, adding fillers in the aeration tank and increasing the sludge return flow, that is, the external return flow, increasing the sludge concentration and sludge settling speed. In order to increase the treatment load and ensure a stable nitrification effect; but these measures increase investment and operating costs, and increasing the internal reflux increases the consumption of dissolved oxygen in the internal reflux to the carbon source of the influent, which further causes insufficient carbon sources and denitrification effects. On the contrary, it decreases; similarly, in order to increase the sludge concentration, increase the sludge settling speed, increase the treatment load, ensure a stable nitrification effect, increase the filler in the aeration tank and increase the sludge return, that is, the external return flow, making the operation more complicated. Increased operating costs and reduced efficiency of sewage treatment

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