Overview
1, Suihua City oxidation pond. The pond covers an area of 130,000 square meters, with a volume of 380,000 cubic meters, two pumping stations, four simple pumping stations, 19,500 meters of brick seepage-proof channels, and an irrigated area of 6,000 acres. According to the total sewage pumping station and oxidation pond water quality analysis, the purification effect is obvious, can reach the farmland irrigation water quality standards. The use of this purified sewage irrigated farmland for seventeen years, on the soil, vegetables, groundwater are not polluted, and after purification of sewage containing nitrogen 22.5 mg / l, containing phosphorus 2.93 mg / l, containing potassium 6.0 mg / l, so that the annual savings of 31430 kg of chemical fertilizers, 1 million tons of groundwater. From the plot test and large area survey, all kinds of vegetables are increased, the average annual yield of 5-8 million pounds, early maturity 7-10 days, an annual increase in income of 25-30 million yuan. Therefore, small and medium-sized cities use oxidation ponds to treat sewage is an important water and fertilizer resources for agricultural production, but also to improve soil fertility and increase vegetable production.
2, Yima Coal Group Company Changcun coal mine oxidation pond. In order to clear the mine water pollution of the Jianhe River, over the past few years, the mine has invested more than 400,000 yuan will be an abandoned pit converted into a volume of 150,000 cubic meters of oxidation ponds, the monthly treatment of mine water 82,000 cubic meters. This new way to manage mine water pollution, not only alleviate the serious shortage of water in the mine, but also produce good economic and social benefits. The mine water treated by the oxidation pond, can be used as the well and underground industrial water, but also in the oxidation pond fish farming, annual output of more than 20,000 kilograms of fresh fish. Nowadays, the oxidation pond is surrounded by green trees and has become a well-known scenic spot.
3, Gao Tang Paper Group oxidation pond. In order to solve the problem of sewage discharge, the group invested 12 million yuan to build an area of more than 600 acres of sewage treatment of the second phase of the project, an oxidation pond, all-weather operation. This makes the company's treated paper wastewater water can be used for aquaculture and agricultural irrigation, and can reach 80% of the water recycled back into production, thus realizing the harmless comprehensive utilization of paper wastewater, becoming a zero-pollution emissions enterprises.
Dongying City, Shandong Province, sewage treatment and utilization of ecological engineering
1, Project Introduction
Dongying City, sewage treatment and utilization of ecological engineering was completed in October 2000, designed to deal with 100,000t / d of water, covers an area of about 110 hectares, the project's total investment of 67 million yuan, is the application of the stabilized ponds at home and abroad to deal with the system design is more perfect one of the sewage treatment plant. Sewage treatment plant. Sewage water quality is as follows:
▲Table 4 List of water quality of incoming water Item BOD COD SS TN TP NH3-N Concentration (mg/L) 70 150 70 30 5 20 The project is adapted to the local conditions, an existing reservoir will be appropriately trimmed and separated, transformed into high-efficiency anaerobic ponds, aeration ponds, aeration ponds and other fish ponds and other treatment units; will be nearby saline wasteland to build fish ponds, lotus root ponds, reed ponds and other ecological use of the ponds. reed ponds and other ecological utilization units.
2, the main treatment unit design
(1) fine grating: a single group of grating width of 1.4m, grating gap of 8mm, grating width of 10mm, grating before the effective depth of 0.8m, over the grating flow rate of 0.9m/s, the grating installation angle of 75 °.
(2) sand sedimentation pond: each group of plane design size 12.0m×3m, effective water depth 1.2m, sand hopper inclination angle 55°, sand hopper height 1.85m.
(3) high-efficiency composite anaerobic ponds: each group of anaerobic ponds with an average length of about 138.88m, a width of about 65.87m, the effective depth of 5.0m, anaerobic ponds in the sewage retention time is 1.68d.
(4) aeration ponds: the average length of each group of aeration ponds is about 133.37m, width is about 66.31m, effective water depth is 3.6m, and the retention time of sewage in the aeration ponds is 1.29d.
(5) aeration fish ponds: the total area of the ponds is 23.24 hectares, and the ponds have an effective depth of 3.5m, and the hydraulic retention time of sewage in the ponds is 8.13d.
(6) Fish ponds: the total area of fish ponds is 12.09 hectares, the effective water depth is 2.5m, and the retention time of sewage in them is 3.02d.
(7) Lotus root ponds: the total area of the ponds is 7.56 hectares, the effective water depth is 1.2m, and the hydraulic retention time of sewage in them is 0.91d.
(8) Reed ponds: the area of reed ponds Ⅰ and Ⅱ are 18.09 hectares and 19.09 hectares, respectively, the effective depth of water for an average of 0.5m, in the reed ponds in the total **** hydraulic retention time of 1.85d.
3, the effect of the operation
The project in October 2000 began to open the water test run, in the fish ponds have not yet stocking of fish fry, lotus roots and reeds have not begun to plant the case of the site inspection, the final effluent Fully composite China's comprehensive sewage discharge secondary standards (GB 8978-1996) requirements.
4, the characteristics of the project
(1) The project adopts the stabilization pond treatment system, which organically combines the treatment and utilization of sewage and realizes the resourcefulness of sewage, which is of great significance to alleviate the contradiction of water shortage in Dongying City.
(2) In the design of this project, special attention is paid to the coordination between the treatment system and the surrounding environment, and to the beautification of the environment. The embankment is neatly constructed, all of which are protected by woolen stones; the aeration fish pond is used as an artificial attraction, and the sewage treatment plant is built into an ecological park.
(3) This project with the traditional activated sludge method, has the advantages of capital investment, low operating costs, maintenance and management convenience.