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Effect of Sewage Sludge on the Growth of Maize Crop
M. Qasim,Naheeda Javed,Himayatullah,M. Subhan
Journal of Biological Sciences , 2001,
Abstract: Sewage sludge application had significantly effected all parameters of maize crop except germination percentage. Maximum Shoot length, Number of leaves per plant, Leaf area, Plant height, Root length, Shoot dry weight and Root dry weight of maize crop were obtained where sewage sludge was applied @ 10-30 ton ha-1. It was recommended that application of sewage sludge at the rate of 20 or 30 ton ha -1 will have favorable effect on the maize crop under the agro-climatic conditions of D.I.Khan.
Impact of Effluent from Gudu District Sewage Treatment Plant on Gudu Stream in Abuja, Nigeria
JH Doughari, JS Dodo, FA Mbuh
Journal of Applied Sciences and Environmental Management , 2007,
Abstract: Gudu stream, the major stream providing water for Durumi 1, Durumi 2 and Durumi 3 settlements of Gudu District in Abuja, Nigeria was studied for impact assessment of discharged effluent from the Gudu District wastewater treatment plant. Studies on the physicochemical properties of the stream revealed high concentration of contaminants at the point of effluent discharge (IP) and upstream (USP). The effluent had no effect on the temperature of the stream at all points sampled (27oC). Bacteriological analysis revealed the most probable number (MPN) to be highest at USP (≥1800/100ml) and EP (≥1700/100ml), followed by that of DSP (1000/100ml) and the least value was obtained at IP (750/100ml). Escherichi coli, Salmonella typhi, S. paratyphi, Shigella flexnerri Klebsiella spp and Pseudomonas aerugenosa. Escherichi coli, Salmonella typhi, S. paratyphi, Shigella flexnerri were the prevalent bacteria isolated at all the points sampled.
Constitute Analysis of the Dissolved Organic Carbon from Sewage Effluent of SBR: the Impact of pH Value

GUO Jin,PENG Yong-zhen,

环境科学 , 2008,
Abstract: To discuss the characteristics of effluent organic matter (EfOM) from biologically treated sewage effluent, the impact of pH value on SBR was originally evaluated with an artificial wastewater. The results revealed that dissolved organic matter (DOM) from SBR was greatly influenced by pH value. When pH value of the SBR with original pH of 6.5 was decreased to 6.0, DOC of its effluent gradually increased from its original 4.0 mg·L-1. Further increasing pH can alleviate this increase. For the SBR with original pH of 8.0, DOC of effluent decreased rapidly from its original 4.0 mg·L-1 to 2 mg·L-1, while further decreasing pH to 6.5 did not affected this. Tannin and soluble microbial products (SMPs) including protein, carbohydrate and DNA consist to the main part of DOM in the sewage effluent. The pH value had a long-term impact on the formation of SMPs. Decreasing pH will result in its gradual increase. The impact of pH value on anaerobic process dominated the DOM degradation during the operation period. Higher pH value was helpful for the degradation of DOM.
Impact of Sewage Sludge as Organic Manure on Some Soil Properties, Growth, Yield and Nutrient Contents of Cucumber Crop  [PDF]
A.H.A. Hussein
Journal of Applied Sciences , 2009,
Abstract: The present study was conducted in two field experiments with two soil types (sandy and calcareous soils) under greenhouse conditions at the Agricultural and Veterinary Training and Research Station of KFU, Al-Hassa area. The objective of the present study was to investigate the effects of different rates of sludge on some soil properties, growth, yield and nutrients status of leaves and fruits of cucumber plant. The experimental soils have sandy and sandy loam textures. All experimental plots (6 m2 area) cultivated with cucumber. Soil application of sewage sludge, at rates of 0 (control, with no sewage sludge), 25, 50, 75, 100 and 125 t ha-1 was used in the present study. Sewage sludge was mixed with top 30 cm surface layer of each plot, two month before planting of cucumber. The experiments were conducted in a randomized complete block design with 3 replications. The experimental plots received the same agricultural practices as recommended. The obtained results revealed that application of sewage sludge significantly altered the chemical properties of soil. Soil Electrical Conductivity (EC), soluble cations (calcium, magnesium, sodium and potassium), soluble anions (chloride and sulphate), available phosphorous and micronutrients (iron, manganese, copper and zinc) and heavy metals (cadmium, cobalt, lead and nickel) were increased in sandy and calcareous soils with increasing sewage sludge application rate. While, the soil reaction (pH) and HCO3ˉ contents were decreased as a result of sludge application. Also, application of sewage sludge improved physical properties of sandy and calcareous soils. It decreased the soil bulk density and increased saturation water content, porosity and organic matter content. Application of sewage sludge improved leaves and fruit contents of macro- and microelements of cucumber plant grown in sandy and calcareous soils. Also, the number of fruits and yield of cucumber were increased with increasing the rates of sewage sludge application. The highest level of application of sludge has a highest effect on the yield of cucumber plants. Generally, application of sewage sludge by mixing it with top 30 cm soil layer was found to be more effective in improving soil physical, chemical and fertility conditions. Moreover, using of sewage sludge as organic manure is considered as a source of nutrients that required for plant which led to increase the growth and the yield of cucumber crop.
Treated wastewater irrigation effect on soil, crop and environment: Wastewater recycling in the loess area of China
Treated wastewater irrigation effect on soil, crop and environment: Wastewater recycling in the loess area of China

WANG Jun-feng,WANG Gen-xu,WANYAN Hua,
WANG Jun-feng

环境科学学报(英文版) , 2007,
Abstract: A study was carried out at the Loess Plateau in Dongzhi,China,to test the feasibility of using secondary treatment sewage effluent and to determine whether the water quality would then meet the recommended irrigation norm.Seven crops,including celery,wheat,maize,millet,apples,rapeseed and yellow beans,were tested in the study.Physical and chemical properties of the soil,crop yield and quality and leachate at different soil depths were measured.In most cases,the quality of the crops that made use of treated sewage was not distinctively different from those that did not use treated sewage.However,yields for the former were much higher than they were for the latter.Leachates at different soil depths were analyzed and the results did not show alarming levels of constituents.For a period of approximately 14 months.the treated sewage irrigation had no significant effect on the loess soil and no cases of illness resulting from contact with the treated sewage were reported.With treated sewage irrigation,a slight increase in the organic content of the soil was observed.
Impact of Methods of Administering Growth-Stage Deficit Irrigation on Yield and Soil Water Balance of a Maize Crop (SAMAS TZEE)
HE Igbadun
Nigerian Journal of Basic and Applied Sciences , 2012,
Abstract: Field experiments were conducted in 2009/10 and 2010/11 irrigation seasons at the Institute for Agricultural Research, Samaru Zaria, to assess the impact of two methods of administering Growth-stage deficit irrigation scheduling (GSDIS) on yield and soil water balance of an early maturing maize variety. The two methods include reducing water application depth at selected crop growth stages and skipping regular irrigation interval at selected crop growth stages. The test crop was SAMAS TZEE early maturing maize variety. Grain yield, biomass yield, harvest index, seasonal water applied, evapotranspiration and deep percolation and crop water productivity were determined. Grain and biomass yields ranged from 2.12 to 3.01 t/ha and 7.57 to 10.0t/ha, respectively, while seasonal evapotranspiration varied from 366 to 486.8 mm across the seasons. This study reveal that at vegetative growth stage of the maize crop, it is better to skip weekly irrigation (to irrigation every other week) and apply water to meet full water requirement than to maintain regular weekly irrigation but apply water at half water requirement. A grain filling to maturity stage, it is more advantageous to reduce irrigation water application by half water requirement than to skip weekly irrigation. Grain yield, biomass yield and seasonal evapotranspiration from such scheduling were not significantly different from that which received weekly irrigation throughout the crop growing season. Moreover, the productivity of water applied was higher while water loss to deep percolation was drastically reduced.
Nutrient inputs in soil cultivated with coffee crop fertigated with domestic sewage  [cached]
Daniel Coelho Ferreira,José Ant?nio Rodrigues de Souza,Rafael Oliveira Batista,Claudio Milton Montenegro Campos
Ambiente e água : An Interdisciplinary Journal of Applied Science , 2011,
Abstract: Fertigation with wastewaters is a great option for reuse of effluents in agriculture. Domestic effluent can be reused after primary treatment, reducing treatment costs and pollution, also providing water and nutrients to crops. This work aimed to quantify the nutrients income in coffee crop fertigated with domestic sewage. Five treatments were used. T1 received only clean water, and treatments T2, T3, T4 e T5 received 180, 350, 480 and 638 mm of sewage, respectively, during four months. Monthly soil analyses allowed to quantify nutrient inputs of 67.45 kg ha-1 of N, 81.89 kg ha-1 of P, 33.34 kg ha-1 of K+, 173.24 kg ha-1 of Ca2+, 49.18 kg ha-1 of Mg2+, 161.56 kg ha-1 of Na+ and 116.19 kg ha-1 of S. Even though the treatments promoted reductions in fertilization and liming, it was still necessary to complement fertilization of coffee crop fertigated with domestic sewage.
Characterization of the dissolved organic matter in the sewage effluent of an SBR

GUO Jin,ZHANG Jingrong,SHANG Huilai,TANG Xuguang,PENG Yongzhen,

环境科学学报 , 2011,
Abstract: The transformation of dissolved organic matter in sequencing batch reactors was investigated, which proposed practical wastewater with different operational parameters. The impact of sludge retention time (SRT) was mainly analyzed with respect to the characterization of effluent organic matter (EfOM) in sewage effluent from SBR. The results revealed that humic-like substances with molecular weight (MW) of 650Da, 1700Da and 2000Da were accumulated during the biological degradation process. Medium MW (500Da~3000Da, humic substances) and large MW organic materials (>10000Da, SMPs) were transformed by low MW organic materials. The molecular weight distribution of EfOM in sewage effluent was rarely impacted by SRT, only intensity difference in MW of 650Da and 20000Da was observed, which means that a longer SRT was helpful for the degradation of humic-like substances and SMPs.
Effect of Irrigation with Sewage Effluent and Rhizobia Inoculation on Growth of Tropical Tree Legumes in Northeast Brazil
International Journal of Agriculture and Forestry , 2012, DOI: 10.5923/j.ijaf.20120201.12
Abstract: The use of domestic sewage in the agriculture is an alternative for reduction of the pollution of rivers, preservation of resources hydrics and availability of water and nutritious for plants. An experiment was conducted to investigate the effects of irrigation with sewage effluent and rhizobia inoculation on growth parameters and macro and micronutrients contents in shoots of leguminous trees grown in an Alisol in northeastern Brazil. Irrigation with sewage effluent and rhizobium inoculation affected significantly the growth parameters and nodulation of L. leucocephala and M. caesalpiniaefolia. Statistically higher values of shoot dry matter and plant height were observed in leguminous trees irrigated with sewage effluent, compared to treatment with water irrigation.Sewage effluent irrigation treatment also increased significantly the contents of N, P, K, Ca, Mg, Fe, Zn and Mn in shoots of woody legumes studied after harvest. Inoculation with Rhizobium promoted significant increases in growth parameters and macro and micronutrients contents, only when associated with application of sewage effluent.
Suitability of Treated Secondary Sewage Effluent for Irrigation of Horticultural Crops in Botswana  [PDF]
V.E. Emongor,E.B. Khonga,G.M. Ramolemana,K. Marumo
Journal of Applied Sciences , 2005,
Abstract: The objective of this study was to evaluate the suitability of treated secondary sewage effluent for irrigation of horticultural crops in Botswana. Secondary effluent water was sampled every month for one year, from a breather pipe on the pivot irrigation system at the Botswana College of Agriculture, Notwane Farm, Gaborone, using USEPA procedures and guidelines. The results of the study showed that the secondary sewage effluent from the activated sewage treatment plant in Gaborone had the following physico-chemical properties: Electrical Conductivity (EC) of 0.51 dS m-1, pH 9.08, total dissolved solids of 358 mg L-1, total alkalinity of 234 mg L-1 as CaCO3, Cl-70 mg L-1, NaCl 115 mg L-1, Sodium Adsorption Ratio (SAR) of 2.26, NO3-5.56 mg L-1, NH4+ 0.3 mg L-1, NO2-0.0184 mg L-1, total Fe 0.623 mg L-1 and faecal coliforms of 5/100 mL. The current results suggest that the Gaborone secondary sewage effluent is suitable for unrestricted irrigation of horticultural crops based on the EC, SAR, Cl-, NaCl, faecal coliforms, available plant nutrients and the low concentration of heavy metals (Pb, Cr, Cu, Co, Cd, As and Se all present in parts per billion).
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