In this study, the process of adsorption of modified rice straw was described using a mathematical description using kinetic and isothermal models. The models of pseudo-first order, pseudo-second order, Elovich and Lynuiver-Burke were used as kinetic models, and the Langmuir model and the Freundlich model are isothermal models.

Keywords: adsorption, adsorption kinetics, adsorption isotherms, Langmuir, Freindlich

The article suggests the use of agricultural wastes of the shell of the anacard nut, cultivated in the Republic of Cote d'Ivoire, as a sorption material. This carbon sorbent (0.5 g / l) was used to remove heavy metals, namely iron (Fe), C = 1.05 mg / l, aluminum (Al), C = 0.10 mg / l) from production waste water of the machine-building plant of LLC Rostselmash (Rostov-on-Don). According to the experimental data, the efficiency of metal removal depends on the sorption time and amounts to: for iron - from 28.6 to 97.1%, for aluminum - from 10 to 90% (Table 2). The concentration of metals in treated wastewater (iron C = 0.03 mg / l and aluminum C = 0.01 mg / l) corresponds to the norms of MPC (iron C = 0.1 mg / l, and aluminum C = 0.04 mg / l), which makes it possible to discharge them into the city water drainage system. From the experimental data, it was concluded that this material can be used as a sorbent.

Keywords: walnut shell anacard, Republic of Cote d'Ivoire, agricultural waste, carbon sorbent, wastewater treatment, heavy metals removal

Consider the choice of coating anodes for electrolysis of sodium hypochlorite nizkokontsentrovannogo 3% solution of sodium salt of food and water of the Black Sea. Defined corrosion resistance of anodes with different laying oxides of ruthenium and iridium and their characteristics: yield chlorine-current voltage on the cell growth dynamics of the concentration of active chlorine in the solution.

Keywords: oxide coatings, iridium, ruthenium, low concentration of sodium hypochlorite, the corrosion resistance of anodes according to the output current of chlorine, the electrolysis of a 3% solution of sodium edible salt and sea water.

Chlorination is the most common, and in fact no alternative method of disinfection using in Baghdad water supply system. Thus there is an urgent need to control the trihalomethanes (THMs) in drinking water. One of the objectives of this study is to investigate the content of THMs in Baghdad water supply network. Studies showed that the substantial amount of THMs formed in water distribution system, THMs content tends to increase with the distance from the starting point coupled with a decrease of residual chlorine concentration. It is observed that in summer total THMs concentration growth rate in water supply network was 1.3-1.4 times higher than in winter as well as total amount of THMs increase by 30 percent in summer. It was found that the concentration of total THMs never exceeded 80 μg/l – the level specified in National Primary Drinking Water Regulations: Disinfectants and Disinfection Byproducts (Stage 1) established by USEPA. However, in summer total THMs concentration in the water always exceeded 40 μg/l – the level set in accordance with Stage 2 of this Rule. The most of total THMs (73-80%) were bromine compounds (CHCl2Br, CHClBr2 and CHBr3). It is shown that the most efficient way to reduce THMs in Baghdad water supply network is to use the chlorine dioxide for chlorination.

Keywords: chlorine dioxide, chlorination, drinking water, trihalomethanes (THM), water supply network, water supply system

 The principal methods of clearance of surface sewage of the  motor and transport undertakings were considering.

Keywords: sewage, admixtures, oil products, cleaning

The article contains the approaches of  improving the reliability and environmental safety of cleaning waste water treatment plants in the industrial environment, with the help of the express - control methods (oxidation - reduction potential respirometry) and modern technology (biologics, intraband circulation biomass)

Keywords: safety, environmental safety, sewage treatment, waste water, oxidation - reduction potential, respirometry, biologics, intraband circulation biomass

In article the direct connection of a condition of soils and quality of a formed superficial diffusion drain is considered. For minimization of pollution of a superficial drain and ground waters when unloading them in a reservoir it is offered to use coal mining waste as a sorbent of organic and inorganic pollution. Thus, the area of utilization of dump breeds of coal mines for nature protection and soil-improving actions extends.

Keywords: Dump breeds of coal mines; sorbent; minimization of pollution of a superficial drain; the urbanized territories; anthropogenous impact on the soil

A new device was made to catch and receive surface runoff to sewerage system. The device increases wastewater flow and velocity in the wastewater networks which is provided by flushing and reducing decay of organic and inorganic substances in the networks.  

Keywords: Device, surface runoff, flow, flushing, siltation

In conditions of reduction of the costs of wastewater actual value of the minimum speed and current case does not provide the required conditions of self-purification of networks. The studies conducted on the silt areas of current collectors of various diameters made of various materials with the purpose of determining the resistance of precipitation in the trays pipes.
Describes the methodology and instruments of research. The data obtained allowed with sufficient certainty have established roughness coefficient bottom sediments of sewers.   

Keywords: drainage network, the rate of self-purification, sewer, roughness, bottom sediments.

The question of an assessment of emission of greenhouse gases from a water complex of housing and communal services is considered. The bundled software, allowing to calculate emission of dioxide of carbon from sewage treatment processes taking into account specific conditions of their course is created. Having defined specific emissions from concrete constructions and stages of transportation and sewage treatment it is possible to supervise and regulate processes of transportation and processing of sewage  

Keywords: emission of greenhouse gases, emission of dioxide of carbon, processing of sewage, bundled software, specific emissions

Measurements of partial pressure of carbon dioxide on various treatment facilities of the sewerage are carried out. It is revealed that the partial pressure of carbon dioxide can be an indicator of environmental friendliness of work of treatment facilities. It is offered to apply an indicator of redox process to expeditious control of work of sewer treatment facilities - rH2. The bundled software is developed for simplification of calculations of emission of carbon dioxide  

Keywords: emission of greenhouse gases, emission of dioxide of carbon, partial pressure of carbon dioxide, processing of sewage, bundled software

Information about authors of issue №4 (2013)

Keywords: authors

In the model aeration tank and pilot conditions, there are shown the effectiveness of ceramic aerators made of Artik tufa which is mined in the Republic of Armenia and determined technological parameters of biological and oxidative purification of waste water in the continuous and discontinuous mode of aeration. 

Keywords: aerators tuff, continuous and discontinuous mode of aeration, Artik field, biological and oxidative purification, waste water, process parameters.

  In article the key parameters necessary for an assessment of a residual resource are considered and the conclusion, about lack of an effective method of an assessment of a residual resource for hydraulic engineering constructions is drawn. An overall objective of carrying out operational monitoring of a technical condition of water carrying out constructions are identification of deterioration of degree of physical wear, the reasons causing their condition, the actual operability of elements and development of actions for providing their various operational parameters, and also the description of a technical condition. The risk of failures and defects on vulnerable objects which many water carrying out constructions - tunnels, channels concern, dyuker, lotkovy channels and pipelines is most dangerous.

Keywords: the hydraulic engineering constructions which are water carrying out channels, nondestructive control methods, a residual resource, modeling, a technical condition.

The mathematical model of storage reservoir has been deduced. The deposition rate of particles in reservoir has been calculated. It is concluded that storage reservoir is a preliminary sedimentation tank.

Keywords: storage reservoir, preliminary sedimentation tank, mathematical model, deposition rate