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Method for purifying river water with low load and low temperature by using natural biofilm reactor

A biofilm reactor, biofilm technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The problem of high water and sediment content can achieve the effect that the treatment efficiency is not affected by low temperature, the method is simple, and the operating cost is low.

Active Publication Date: 2014-05-07
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Invention patent (application number 201110159014.4) proposes a bypass sludge reduction and silt separation for the problems of high influent sediment content, low VSS / MLSS, and insufficient carbon source often encountered in the current nitrogen and phosphorus removal process And a nitrogen and phosphorus removal sewage treatment system and method, consisting of two parts: a main sewage treatment system with a nitrogen and phosphorus removal function and a bypass system
[0019] At the same time, for the water quality of rivers with low pollution load, although the invention patent (publication number 201210014485.0) proposes a method for regulating microbial activity in membrane bioreactors for the treatment of slightly polluted surface water, the effect of purifying water quality remains to be tested

Method used

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  • Method for purifying river water with low load and low temperature by using natural biofilm reactor
  • Method for purifying river water with low load and low temperature by using natural biofilm reactor

Examples

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Effect test

Embodiment 1

[0050] Example 1: A lake near Nanjing Youfang Bridge is a typical eutrophic lake. The river water collected from the river into the lake is used to enrich and cultivate natural biofilms, and artificial aquatic plants are used as the carriers of natural biofilms. After 35 days of natural biofilm enrichment and cultivation, the cultivation temperature was lowered with a gradient of 1 degree every 2 days until the cultivation temperature was 4°C, and the cultivation was continued at this temperature for 7 days. Bioreactors include sedimentation tanks, anaerobic reaction tanks, aerobic reaction tanks, sedimentation tanks, and artificial packing. The above-mentioned parts account for 10%, 30%, 30%, 10%, and 20% of the total reactor volume. The artificial filler is composed of activated carbon, peat, sponge, fiber, and non-woven fabric, with a weight ratio of 0.1:0.5:0.1:0.2:0.1. Use ordinary LED waterproof lamp as light source, and ordinary fish pump as air pump (power 3.2W). Use s...

Embodiment 2

[0052] Example 2: Kunming Daqing River is the main river into the lake of Dianchi Lake. On both sides of the river are agricultural areas where leeks and flowers are grown. The water quality of the river is in a serious eutrophication state, with an eutrophication index greater than 70 and a small amount of low-load heavy metal pollutants. In order to purify this kind of sewage, experimental research was carried out indoors. The collected river water was placed in a 1.2 cubic meter water tank. The natural biofilm reactor in Example 1 was used for purification. The removal efficiency of each pollutant was TSS 87.2. %, COD 82.5%, UV254nm-matter 79.1%, TN 67.4%, TP 71.2%, Hg 80.6%, Cr 79.4%, Cu83.3% and Cd 85.2%. In a word, after the implementation of the natural biofilm reactor of the present invention, the river sewage is significantly purified in winter, which solves the problem of low temperature pollutant removal efficiency.

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Abstract

The invention belongs to the field of ecological and environmental protection, relates to the field of purification of low-load river water in a field area, and particularly relates to a method for purifying river water with low load and low temperature by using a natural biofilm reactor. The method comprises the following steps of: (1) gathering and cultivating of a natural biofilm, namely carrying out gathering and cultivating of microorganisms such as algae and bacteria by directly utilizing riverway water as a 'seed source'; (2) low-temperature natural biofilm domestication, namely reducing the cultivating temperature at the subdivision stage of the pre-cultivated natural biofilm, wherein the temperature reducing gradient is 1 DEG C reduced every two days until the cultivation temperature is reduced to 0-4 DEG C; (3) low-temperature inoculation of the natural biofilm to a reactor; (4) debugging and operating of the natural biofilm reactor, namely adjusting hydraulic load and standing time of the reactor by adjusting the weight of the floating body and the reactor; and (5) water purification by the natural biofilm reactor. The method is simple and feasible, good in purification effect of riverway water in the field area, and convenient to popularize; and meanwhile, the problem of low removal efficiency of pollutants in winter is solved.

Description

Technical field [0001] The invention belongs to the field of ecology and environmental protection, and relates to the field of low-load river water purification in farmland areas, and in particular to a method for purifying low-load low-temperature river water by using a natural biofilm reactor. Background technique [0002] At present, the eutrophication of water bodies is seriously affecting the living environment of human beings. In the past 10 years, the eutrophication of rivers, lakes and reservoirs in my country has been very serious and has been deteriorating. Among the more than 700 rivers in my country (with a total length of 100,000 kilometers), 70.6% of the rivers are polluted. There are more than 300 million people in rural my country who have unsafe drinking water. Among them, more than 63 million people drink high-fluoride water, 2 million people drink high-arsenic water, more than 38 million people drink brackish water, and 190 million people drink water with exce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 吴永红陆海鹰王金花刘志彬陈建贞李运东
Owner INST OF SOIL SCI CHINESE ACAD OF SCI