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Method for repairing arsenic-containing wastewater by using sludge

A sludge and wastewater technology, applied in water/sludge/sewage treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of limited arsenic adsorption efficiency, waste of resources, increased cost, etc. The effect of efficient utilization and low energy consumption

Inactive Publication Date: 2017-11-28
QINGDAO HAICHENG INTPROP SERVICES CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the needs of urbanization and economic development, the amount of urban sewage treatment in China has shown an upward trend in recent years. As a derivative of sewage, the output of municipal sludge has also been increasing in recent years; however, one of the problems facing our country is the effective use of sludge. The rate is low, and some sewage treatment enterprises adopt direct dumping or simple landfill disposal methods to dispose of sludge, which not only threatens the soil environment and residents’ health, but also causes waste of resources; arsenic is a common highly toxic pollutant in the water environment, and arsenic pollution There are mainly two types of man-made reasons and natural reasons. Man-made factors such as mining and smelting in metal mining areas, processing and use of arsenic products have led to a sudden increase in arsenic content in soil and water in some areas. The arsenic in polluted areas is mainly arsenite (three valent arsenic) and arsenate (pentavalent arsenic) and other inorganic arsenic forms; at present, the restoration of arsenic-containing wastewater mainly includes phytoremediation, ion exchange, adsorption, precipitation, chemical oxidation and other methods, and the adsorption method can quickly and effectively repair arsenic-containing wastewater. Wastewater, but the adsorption efficiency of arsenic is closely related to the type of adsorbent. There are related patent applications for the preparation of sewage adsorbents from sludge, such as patent application numbers (201510261494.3), (201510978536.5), (201310169985.6), etc., all of which use chemical methods Modification to prepare adsorbents usually increases the cost, easily causes secondary pollution, and the adsorption efficiency of arsenic is very limited. Therefore, it is necessary to use sludge to develop an environmentally friendly and efficient arsenic removal flocculant or adsorbent for sewage purification

Method used

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  • Method for repairing arsenic-containing wastewater by using sludge
  • Method for repairing arsenic-containing wastewater by using sludge
  • Method for repairing arsenic-containing wastewater by using sludge

Examples

Experimental program
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Embodiment 1

[0025] The method for using sludge to repair arsenic-containing wastewater involved in this embodiment specifically includes the following steps:

[0026] (2) Pre-cultivation of sludge

[0027] Select 200-500 parts of urban sewage field sludge, industrial organic sludge or anaerobic digestion sludge according to parts by weight, add 70 parts by weight of ferrous sulfate and 40 parts of potassium nitrate, put them into the incubator and mix them, and fill with nitrogen for 20 -60 minutes, control the temperature at 20-30°C for static culture for 7-10 days to prepare pre-cultured sludge for later use;

[0028] (2) Preparation of NAFO medium

[0029] Add the medium into the bioreactor according to the following weight ratio: NH 4 Cl 25-30 parts, K 2 HPO 4 20-30 parts, MgSO 4 10-15 parts, CaCl 2 1-3 parts, 80-410 parts of anhydrous sodium acetate, 80-170 parts of sodium nitrate or 100-210 parts of potassium nitrate, FeCl 2 4H 2 O200-400 parts or heptahydrate FeSO 4 27...

Embodiment 2

[0037]The sludge was obtained from a sewage treatment plant in Jimo City, Qingdao. It was digested sludge. 200 mL of sludge was added with 0.71 g of ferrous sulfate and 0.4 g of potassium nitrate, filled with nitrogen for 30 min, and incubated at 25 °C for 7 days. Take 10mL sample from the above preculture sludge and add to 200mL sterile NAFO medium: NH 4 Cl 0.28g / L, K 2 HPO 4 0.25g / L, MgSO 4 0.1g / L, CaCl 2 0.01g / L, sodium acetate 20mM, sodium nitrate 15mM, FeCl 2 4H 2 O 15mM, adjust the pH to 7.0. Nitrogen gas was filled into the reactor for 30 minutes, and the culture was statically cultivated at 25°C for 8 days. After culturing, the sludge turns from black to yellow-brown, and the bio-iron flocculant is obtained.

[0038] After NAFO culture, the apparent color of the sludge changed significantly, from the initial black with stench to yellow-brown flocs, and the odor disappeared; high-throughput 16s rRNA gene sequencing was used to construct the microbial community ...

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Abstract

The invention belongs to the technical fields of recycling of sludge and repairing of arsenic-containing wastewater and particularly relates to a method for repairing arsenic-containing wastewater by using sludge. The method is characterized by purifying the wastewater by using biological iron flocculants generated in an NAFO (Nitrate-dependent anaerobic ferrous oxidation) process of microorganisms in the sludge. The method specifically comprises the steps of pre-culturing the sludge, preparing an NAFO culture medium, preparing the biological iron flocculants and removing arsenic in the wastewater. Through the method, the sludge is converted into the biological iron flocculants by the NAFO process of the microorganisms; the sludge can be recycled; the process is free of secondary pollutants and low in energy consumption; the prepared biological iron flocculants are capable of effectively removing trivalent arsenic and pentavalent arsenic in the water; different types of arsenic-containing wastewater can be repaired.

Description

Technical field: [0001] The invention belongs to the technical field of sludge resource utilization and restoration of arsenic-containing wastewater, and in particular relates to a method for utilizing sludge to repair arsenic-containing wastewater, in which biological iron flocculants are produced through the microbial NAFO process in the sludge to purify the wastewater. technical background: [0002] Due to the needs of urbanization and economic development, the amount of urban sewage treatment in China has shown an upward trend in recent years. As a derivative of sewage, the output of municipal sludge has also been increasing in recent years; however, one of the problems facing our country is the effective use of sludge. The rate is low, and some sewage treatment enterprises adopt direct dumping or simple landfill disposal methods to dispose of sludge, which not only threatens the soil environment and residents’ health, but also causes waste of resources; arsenic is a comm...

Claims

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Application Information

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IPC IPC(8): C02F3/00C02F101/10
CPCC02F3/00C02F2101/103
Inventor 王莹马文静迟庆东蔡冬石云鹏
Owner QINGDAO HAICHENG INTPROP SERVICES CO LTD
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