CN-118954831-B - Distributed rural domestic sewage low-carbon quality-dividing treatment and recycling system

CN118954831BCN 118954831 BCN118954831 BCN 118954831BCN-118954831-B

Abstract

The invention discloses a low-carbon quality-dividing treatment and recycling system for decentralized rural domestic sewage, which relates to the field of sewage treatment, the technical scheme is characterized in that the septic tank, the liquid fertilizer storage tank, the sediment oil separation well, the anaerobic biological membrane tank and the sewage purification module are all provided with a water inlet and an overflow port, and the height of each overflow port is greater than or equal to the height of the water inlet on the structure where the overflow port is positioned. Fermenting bacteria and spherical filler are put into the septic tank. The septic tank is connected with black water, the sediment separation well is connected with kitchen sewage, liquid overflowed from the septic tank flows into the liquid fertilizer storage tank, and effluent water from the liquid fertilizer storage tank and the sediment separation well and other grey water flow into the anaerobic biomembrane tank. Effluent from the anaerobic biomembrane pond flows into the sewage purification module. The invention respectively carries out different treatments on black water, kitchen waste water and other grey water sewage, and the whole treatment process does not need a power device, has small construction and operation difficulty and low cost, and is suitable for a decentralized treatment mode of rural domestic sewage treatment.

Inventors

ZHU GUANGCAN
LI MENGLI
DENG XU
YANG ZHONGLIAN
WANG CHUYA
LU YONGZE
GAO MENGMEI

Assignees

东南大学
登高环保科技有限公司

Dates

Publication Date: 20260512
Application Date: 20240826

Claims (9)

1. A low-carbon quality-dividing treatment and recycling system for decentralized rural domestic sewage is characterized in that: The anaerobic biological membrane sewage treatment device comprises a septic tank, a liquid fertilizer storage tank, a sediment oil isolation well, an anaerobic biological membrane tank and a sewage purification module, wherein the sewage purification module is at least one of a modularized constructed wetland, an unpowered wind-drawing trickling filter and an unpowered sewage purification tank; The overflow port of the septic tank is connected with the water inlet of the liquid fertilizer storage tank, the top of the liquid fertilizer storage tank is opened, the overflow port of the liquid fertilizer storage tank and the overflow port of the sediment oil-separating well are connected with the water inlet of the anaerobic biological film tank, the overflow ports of the anaerobic biological film tank are connected with the water inlets of all sewage purification modules, and the liquid overflowed from the overflow ports of all sewage purification modules is discharged into water or farmlands; the sewage purification module used in the sewage management and control area is a modularized constructed wetland; Setting a ground water level threshold, wherein a sewage purification module used in a region with the ground water level smaller than or equal to the ground water level threshold in the non-sewage management and control region is an unpowered wind-drawing trickling filter, and a sewage purification module used in a region with the ground water level larger than the ground water level threshold in the non-sewage management and control region is an unpowered sewage purification tank; The matrix filling areas of the modularized constructed wetland are divided into three grids which are sequentially communicated, wherein gravel is filled in the first grid, nitrogen adsorption filter materials are filled in the second grid, and phosphorus adsorption filter materials are filled in the third grid; the unpowered sewage purifying tank is internally provided with three grids at intervals, the first grid is internally filled with spherical filler, the second grid is internally filled with nitrogen adsorption filter materials, the third grid is internally filled with phosphorus adsorption filter materials, the spherical filler is filled below the nitrogen adsorption filter materials of the second grid, and the spherical filler is filled below the phosphorus adsorption filter materials of the third grid.
2. The low-carbon and resource-sharing treatment and recycling system for the rural domestic sewage is characterized in that the black water is from a toilet with single flushing amount smaller than 1L, the adding amount of the fermentation inoculant is 300-500mL/m 3 , and the accumulation volume of the spherical filler is 50-80% of the fermentation space volume of the septic tank.
3. The distributed rural domestic sewage low-carbon quality control and recycling system according to claim 2, wherein the residence time of the black water in the septic tank is not less than 30 days.
4. The low-carbon and resource-sharing system for the decentralized rural domestic sewage, as claimed in claim 1, is characterized in that the microbial carrier put in the anaerobic biomembrane pond is spherical filler, and the accumulation volume of the spherical filler is 50% -80% of the volume of the anaerobic biomembrane pond.
5. The distributed rural domestic sewage low-carbon quality control and recycling system according to claim 1, wherein the filler of the unpowered sewage purifying tank, the filler of the unpowered air-drop filter tank and the matrix of the modularized constructed wetland all comprise adsorption filter materials, and the adsorption filter materials comprise at least one of nitrogen adsorption filter materials and phosphorus adsorption filter materials.
6. The system for low-carbon and resource-sharing treatment and recycling of rural domestic sewage in a decentralized manner according to claim 5, wherein the filler of the unpowered sewage purifying tank further comprises spherical filler.
7. The system for low-carbon and resource management of decentralized rural domestic sewage according to claim 5, wherein the matrix of the modular constructed wetland further comprises gravel.
8. The low-carbon quality-dividing treatment and recycling system for the rural domestic sewage in a decentralized manner according to any one of claims 1 to 7, further comprising a regulating reservoir, wherein the regulating reservoir is provided with a top opening, a water inlet and an overflow port, the height of the overflow port of the regulating reservoir is greater than or equal to that of the water inlet of the regulating reservoir, the overflow ports of all sewage purification modules are connected with the water inlet of the regulating reservoir, and liquid overflowed from the overflow port of the regulating reservoir is discharged into a water body or a farmland.
9. The system for low-carbon and resource-sharing treatment and recycling of rural domestic sewage in a decentralized manner according to claim 8, further comprising a water pump, wherein the water pump is used for pumping out liquid in the regulating reservoir from the top opening of the regulating reservoir for utilization or discharge when the effluent of the regulating reservoir cannot overflow and be discharged.

Description

Distributed rural domestic sewage low-carbon quality-dividing treatment and recycling system Technical Field The invention relates to the field of sewage treatment, in particular to a low-carbon quality-dividing treatment and recycling system for decentralized rural domestic sewage. Background Most rural areas have no special sewage collection pipe network and sewage treatment system, which means that most rural sewage is directly discharged without treatment, and the ecological environment and the safety are greatly threatened. At present, rural domestic sewage treatment can be divided into three treatment modes of nano-tube treatment, centralized treatment and decentralized treatment. The nano-tube treatment mode is to collect rural domestic sewage intensively and to bring the rural domestic sewage into a sewage treatment plant or nearby sewage treatment facilities for unified treatment. But is only suitable for villages with high aggregation degree, close to towns (in principle, in the range of 3km generally) and topography conditions, and the domestic sewage is beneficial to automatically flow into a town sewage pipe network by gravity. The centralized treatment mode is suitable for rural areas where rural domestic sewage cannot be brought into sewage treatment plants or urban sewage main pipes and sewage treatment facilities need to be built by oneself, the centralized treatment equipment usually occupies a large area, and the equipment and operation and maintenance management cost is high. The decentralized treatment mode is suitable for farmers in areas with rich water systems, mountain areas and other areas with great pipe network construction difficulty, or single or adjacent farmers distributed in villages, and is a main mode of the existing rural domestic sewage treatment. Rural sewage can be divided into black water and grey water. Black water is collected from a toilet, and the main components are feces and urine. Greywater mainly comprises kitchen water, washing water, shower water and other water. The Chinese patent CN111333274A provides a rural sewage strengthening and quality-dividing integrated and recycling treatment device which respectively carries out different treatments on black water and grey water. However, the device needs to be equipped with power devices such as a motor, a fan, a reflux pump, a peristaltic pump and the like, so that the difficulty of construction and operation and maintenance of the device is high, and the device has quite large implementation difficulty in a decentralized processing mode. Disclosure of Invention Aiming at the problems that the existing rural sewage treatment device has more power devices, large construction and operation difficulty, high cost and difficult application to a decentralized treatment mode, the invention aims to provide a decentralized rural domestic sewage low-carbon quality-dividing treatment and recycling system which comprises a septic tank, a liquid fertilizer storage tank, a sediment oil separation well, an anaerobic biological membrane tank and a sewage purification module. The sewage purification module is at least one of a modularized constructed wetland, an unpowered wind-drawing trickling filter and an unpowered sewage purification tank. The septic tank, the liquid fertilizer storage tank, the sediment oil well, the anaerobic biomembrane tank and the sewage purification module are all provided with a water inlet and an overflow port, and the height of each overflow port is greater than or equal to the height of the water inlet on the structure where the overflow port is positioned. The water inlet of the septic tank is connected with black water, the water inlet of the sediment separation well is connected with kitchen sewage, and all ash water except the kitchen sewage is connected with the water inlet of the anaerobic biomembrane tank. The overflow port of the septic tank is connected with the water inlet of the liquid fertilizer storage tank, the top of the liquid fertilizer storage tank is provided with an opening, and the overflow port of the liquid fertilizer storage tank and the overflow port of the sediment separation well are connected with the water inlet of the anaerobic biological membrane tank. The overflow ports of the anaerobic biomembrane pond are connected with the water inlets of all the sewage purification modules, and the liquid overflowed from the overflow ports of all the sewage purification modules is discharged into water or farmlands. The sewage purification module used in the sewage management and control area is a modularized constructed wetland. Setting a groundwater level threshold. In the non-sewage control area, the sewage purification module used in the area with the groundwater level smaller than or equal to the groundwater level threshold is an unpowered wind-drawing trickling filter. In the non-sewage management and control area, the sewage purification module used in the area with the g